[Federal Register Volume 63, Number 161 (Thursday, August 20, 1998)]
[Rules and Regulations]
[Pages 44545-44552]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-22240]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 98-ANE-27-AD; Amendment 39-10713; AD 98-17-11]
RIN 2120-AA64
Airworthiness Directives; Textron Lycoming and Teledyne
Continental Motors Reciprocating Engines
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule.
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SUMMARY: This amendment adopts a new airworthiness directive (AD),
applicable to certain Textron Lycoming and Teledyne Continental Motors
reciprocating engines that had crankshafts repaired by Nelson Balancing
Service, Repair Station Certificate No. NB7R820J, Bedford,
Massachusetts, that requires removal from service of affected
crankshafts, or a visual inspection, magnetic particle inspection, and
dimensional check of the crankshaft journals, and, if necessary, rework
or removal from service of affected crankshafts and replacement with
serviceable parts. This amendment is prompted by reports of crankshafts
exhibiting heat check cracking of the nitrided bearing surfaces which
led to crankshaft cracking and subsequent failure. The actions
specified by this AD are intended to prevent crankshaft failure due to
cracking, which could result in an inflight engine failure and possible
forced landing.
DATES: Effective October 19, 1998.
FOR FURTHER INFORMATION CONTACT:
Rocco Viselli, Aerospace Engineer (assigned to Textron Lycoming), New
York Aircraft Certification Office, FAA, Engine and Propeller
Directorate, 10 Fifth St., 3rd Floor, Valley Stream, NY 11581-1200;
telephone (516) 256-7531, fax (516) 568-2716; or Jerry Robinette,
Aerospace Engineer (assigned to Teledyne Continental Motors), Atlanta
Aircraft Certification Office, FAA, Small Airplane Directorate, 1895
Phoenix Boulevard, One Crown Center, Suite 450, Atlanta, GA 30349;
telephone (770) 703-6096, fax (770) 703-6097.
SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal
Aviation Regulations (14 CFR part 39) to include an airworthiness
directive (AD) that is applicable to certain Textron Lycoming and
Teledyne Continental Motors (TCM) reciprocating engines that had
crankshafts repaired by Nelson Balancing Service, Repair Station
[[Page 44546]]
Certificate No. NB7R820J, Bedford, Massachusetts, was published in the
Federal Register on May 11, 1998 (63 FR 25781). That action proposed to
require removal from service of affected crankshafts, or a visual
inspection, magnetic particle inspection, and dimensional check of the
crankshaft journals, and, if necessary, rework or removal from service
of affected crankshafts and replacement with serviceable parts.
Interested persons have been afforded an opportunity to participate
in the making of this amendment. Due consideration has been given to
the comments received.
One commenter states that the proposed AD is insufficiently
researched; specific dates and serial numbers are needed for affected
crankshafts. The commenter suggests that there were periods during the
time frame of interest when the grinding was acceptable. The FAA does
not concur. The FAA believes that this AD has been thoroughly
researched. The failures/known cases of crankshaft nitride cracking
occur throughout the time period. There is no way to isolate one
specific time and determine that crankshafts during that time were
satisfactorily repaired. Those crankshafts that are identified in the
company's records are presented in the AD, but the FAA has determined
that these records are incomplete. Therefore, the applicability of the
AD must include all crankshafts identified in aircraft owners' and
other repair station records as being repaired at Nelson during the
suspect time period.
The same commenter questions how many TCM O-470 crankshafts have
been determined to be bad and if there is a sufficient percentage to
warrant tearing down all O-470 engines that Nelson repaired during this
time period. The FAA does not concur. The available data indicates that
crankshafts from O-470 engines were subject to the same improper repair
procedures as crankshafts from other engines. Of the three related
failure events, one occurred on an O-470-R engine. Therefore, the FAA
has determined that all crankshafts repaired by Nelson Air Services
during the suspect time period have the potential of causing an unsafe
condition.
The same commenter believes that the proposed AD is based on
failures of aerobatic engines. The commenter suggests that the AD is an
overly reactive extrapolation from highly stressed aerobatic
crankshafts to comparatively mildly stressed non-aerobatic engines. The
FAA does not concur. The FAA is unaware of any information that
indicates that the safety analysis presented in the NPRM is biased by
aerobatic engine data. There is only one aerobatic engine listed. The
other engines are used in normal or utility category applications. The
data indicates that nitride cracking of the crankshafts is not limited
to specific flight operations but rather a matter of an improper
grinding procedure that can result in heat check cracking of the
nitride surface.
The same commenter states that the AD should not be issued as
written, but only imposed on those who have a reasonable likelihood of
having a bad crankshaft, due to expense required to tear down an
engine. The FAA does not concur. The expense of the AD was certainly
considered as evidenced by the NPRM economic impact statement. However,
it must be emphasized that the FAA has made a determination that an
unsafe condition is likely to exist on crankshafts repaired by Nelson
during the suspect time period. The FAA determined that an AD was
necessary after consideration of both the severity of the potential
unsafe condition and the economic impact of the action.
One commenter states that the AD should not apply to crankshafts
which were in the Nelson shop for balancing, it should only apply to
those which had the journals ground. The FAA does not concur. The data
indicates that deficient process controls existed at Nelson Balancing
Service during the suspect time period and therefore all crankshafts
which were repaired in the Nelson shop during that time are suspect.
However, if an individual can substantiate that any given crankshaft
should be exempt from the requirements of the AD based on the extent of
repairs performed by Nelson, then this data can be presented through an
FAA Airworthiness Inspector as an Alternative Method of Compliance with
the AD.
This commenter further states that the AD should reaffirm that only
those work order numbers noted in the AD are affected. The FAA does not
agree. The work orders listed in the AD are intended as guidance only
as the FAA can not be absolutely sure that all crankshafts are
accounted for in the listing.
One commenter states that the AD should apply only to those
crankshafts repaired after September 1995, arguing that date
represented the earliest repair date for the crankshaft that
demonstrated a problem in service after being serviced by Nelson. The
FAA does not concur. The crankshaft with the earliest repair date to
have exhibited a problem in service was repaired in February 1995 and
failed after only 30 hours in service. The repair station was
certificated in September 1994. Thus, the FAA has limited this AD to
only those engines with crankshafts on which this unsafe condition
either exists or is likely to develop.
After careful review of the available data, including the comments
noted above, the FAA has determined that air safety and the public
interest require the adoption of the rule as proposed.
There are approximately 250,000 engines of the designs listed in
the applicability section of this AD in the worldwide fleet. The FAA
estimates that 200,000 of those engines are installed on aircraft of
U.S. registry. Of these it is estimated that 30% or 60,000 engines will
have had an overhaul in the time frame of interest; however, only 291
would be required to take compliance action. Of this 60,000 it is
estimated that 10,000 will require removal of the propeller spinner to
determine applicability of the AD. The cost associated with the spinner
removal/replacement is estimated to be $60 per work hour average labor
rate times one hour. It will take approximately 90 work hours per
engine to accomplish the proposed action and the average labor rate is
$60 per work hour. Required parts would cost $115 per engine for
gaskets, seals, etc. In addition, it is estimated that half of the 291
affected engines can be reworked at a cost of $1,800 per engine and
that the other half of the 291 affected engines will be rejected, plus
purchasing another crankshaft which will cost $4,000 per engine. Based
on these figures, the total cost impact of the AD on U.S. operators is
estimated to be $3,048,765.
The regulations adopted herein will not have substantial direct
effects on the States, on the relationship between the national
government and the States, or on the distribution of power and
responsibilities among the various levels of government. Therefore, in
accordance with Executive Order 12612, it is determined that this final
rule does not have sufficient federalism implications to warrant the
preparation of a Federalism Assessment.
For the reasons discussed above, I certify that this action (1) is
not a ``significant regulatory action'' under Executive Order 12866;
(2) is not a ``significant rule'' under DOT Regulatory Policies and
Procedures (44 FR 11034, February 26, 1979); and (3) will not have a
significant economic impact, positive or negative, on a substantial
number of small entities under the criteria of the Regulatory
Flexibility Act. A final evaluation has been prepared for this action
and it is contained in the Rules Docket. A copy
[[Page 44547]]
of it may be obtained from the Rules Docket at the location provided
under the caption ADDRESSES.
List of Subjects in 14 CFR Part 39
Air Transportation, Aircraft, Aviation safety, Safety.
Adoption of the Amendment
Accordingly, pursuant to the authority delegated to me by the
Administrator, the Federal Aviation Administration amends part 39 of
the Federal Aviation Regulations (14 CFR part 39) as follows:
PART 39--AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
2. Section 39.13 is amended by adding the following new
airworthiness directive:
98-17-11 Textron Lycoming and Teledyne Continental Motors:
Amendment 39-10713. Docket 98-ANE-27-AD.
Textron Lycoming (LYC) O-235, O-235-C1, O-235-C2C, O-235-L2C, O-
235-N2C, O-290, O-290-D2, O-320, O-320-A, O-320-A1A, O-320-A2B, O-
320-B2B, O-320-B2C, O-320-D2J, O-320-D3G, O-320-E2A, O-320-E2D, O-
320-E2G, O-320-E3D, O-320-H2AD, O-360, O-360A1A, O-360-A1D, O-360-
A3A, O-360-A4A, O-360-A4K, O-360-B1B, IO-360-F1A6, AEIO-320-E1B,
HIO-360-C1A, IO-320, IO-320-B1A, IO-360, IO-360-A1A, IO-360-A1B6,
IO-360-B1E, IO-360-C, IO-360-C1C, IO-360-C1C6, IO-360-C1D6, IO-360-
D, O-540-A1B5, O-540-A1D5, O-540-R2AD, IO-540, IO-540-C4B5, IO-540-
S1A5, TIO-540-A2, LIO-320-C1A, LIO-360-C1E6, and IO-720
reciprocating engines; and Teledyne Continental Motors (TCM) A-65,
A65-3, A65-8, A75, A75-8, C75-12, C85, C85-8, C85-12, C90-8FJ, C90-
12, O-200, O-200-A, O-300, O-300-D, IO-360-C, E-185-4, E-225-8, O-
470, O-470-K, O-470-L, O-470-R, O-470-11, IO-470, IO-470-N, IO-470-
S, IO-520, IO-520-D, GTSIO-520, and TSIO-520-VB reciprocating
engines, with installed crankshafts repaired by Nelson Balancing
Service, Bedford, Massachusetts, Repair Station Certificate No.
NB7R820J, between February 1, 1995, and December 31, 1997,
inclusive, as listed (by work order (W/O)) in Table 1 of this AD.
Table 1
--------------------------------------------------------------------------------------------------------------------------------------------------------
Engine and model W/O Date Engine Ser. No.
--------------------------------------------------------------------------------------------------------------------------------------------------------
LYC:
AEIO-320-E1B.................................. 1134 2/17/96 L-5653-55A
HIO-360-C1A................................... 1155 2/7/96 L-12126-51A
IO-320........................................ 1141 1/17/96 ............................................
IO-320-B1A.................................... 1525 11/14/97 ............................................
IO-360........................................ 1314 12/17/96 ............................................
IO-360........................................ IN6137 8/7/97 ............................................
IO-360-A1A.................................... 1230 6/10/96 L-474-51
IO-360-A1A.................................... 1289 10/23/96 L-4085-5174
IO-360-A1A.................................... 1415b 5/23/97 RL-3920-51A
IO-360-A1B6................................... 1463 7/31/97 ............................................
IO-360-B1E.................................... 1312 12/12/96 L-4453-51A
IO-360-C...................................... 1146 1/23/96 R-51448-9-C
IO-360-C1C.................................... 1336 2/10/97 ............................................
IO-360-C1C.................................... 1518 12/9/97 ............................................
IO-360-C1C6................................... 1530 11/25/97 ............................................
IO-360-C1C6................................... 1537 12/9/97 L-19294-51A
IO-360-C1D6................................... 1286 4/28/97 ............................................
IO-360-D...................................... 1540 12/2/97 ............................................
IO-360-F1A6................................... 1176 3/7/96 L-27423-36A
IO-540........................................ 1014 2/8/95 ............................................
IO-540........................................ 1056 6/13/95 ............................................
IO-540........................................ 1302 12/5/96 ............................................
IO-540-C4B5................................... 1313 12/17/96 L-19547-48
IO-540-S1A5................................... 1513 10/27/97 L-19597-48A
IVO-435-G1A................................... 1271 10/1/96 ............................................
LIO-320-C1A................................... 1158 2/8/96 ............................................
LIO-360-C1E6.................................. 1280 10/7/96 ............................................
LIO-360-C1E6.................................. 1281 10/9/96 ............................................
O-235......................................... 1013 2/21/95 ............................................
O-235......................................... 1051 6/2/95 ............................................
O-235......................................... 1054 6/9/95 ............................................
O-235......................................... 1057 6/14/95 L-9041-15
O-235......................................... 1058 6/29/95 ............................................
O-235......................................... 1060 6/30/95 ............................................
O-235......................................... 1069 8/10/95 ............................................
O-235......................................... 1110 2/20/96 ............................................
O-235......................................... 1145 1/23/96 ............................................
O-235......................................... 1151 1/25/96 ............................................
O-235......................................... 1160 2/9/96 RL-24636-15
O-235......................................... 1305 12/5/96 L-22542-15
O-235......................................... 1329 2/11/97 ............................................
O-235......................................... 1332 2/11/97 ............................................
O-235......................................... 1481 9/2/97 ............................................
O-235-C1...................................... 1089 10/8/95 L-6475-15
O-235-C1...................................... 1188 4/2/96 L-7143-15
O-235-C1...................................... 1335 3/12/97 L-5569-15
O-235-C1...................................... 1367 3/24/97 ............................................
O-235-C2C..................................... 1019 2/24/95 L-12284-15
[[Page 44548]]
O-235-C2C..................................... 1040 5/8/95 ............................................
O-235-C2C..................................... 1105 12/1/95 L-12273-15
O-235-L2C..................................... 1030 4/6/95 L-14545-15
O-235-L2C..................................... 1036 4/24/95 ............................................
O-235-L2C..................................... 1037 4/24/95 L-23012-15
O-235-L2C..................................... 1050 6/2/95 L-15542-15
O-235-L2C..................................... 1062 7/5/95 L-18306-15
O-235-L2C..................................... 1067 8/8/95 ............................................
O-235-L2C..................................... 1070 8/10/95 L-160015-15
O-235-L2C..................................... 1095 11/14/95 RL-023227-15
O-235-L2C..................................... 1101 11/4/95 L-15300-15
O-235-L2C..................................... 1102 11/15/95 L-20183-15
O-235-L2C..................................... 1162 2/14/96 L-16114-15
O-235-L2C..................................... 1179 3/11/96 L-21215-15
O-235-L2C..................................... 1219 5/16/96 L-21215-15
O-235-L2C..................................... 1251 8/22/96 ............................................
O-235-L2C..................................... 1285 10/19/96 ............................................
O-235-L2C..................................... 1365 3/24/97 ............................................
O-235-L2C..................................... 1400 4/28/97 ............................................
O-235-L2C..................................... 1414 8/5/97 ............................................
O-235-L2C..................................... 1417 12/5/97 ............................................
O-235-L2C..................................... 1433 6/26/97 L-17074-15
O-235-L2C..................................... 1435 6/9/97 ............................................
O-235-L2C..................................... 1504 10/31/97 ............................................
O-235-L2C..................................... 1508 11/18/97 ............................................
O-235-L2C..................................... 1524 11/12/97 ............................................
O-235-L2C..................................... 1536 11/24/97 ............................................
O-235-L2C..................................... 2010 11/19/97 ............................................
O-235-N2C..................................... 1511 10/29/97 L-23857-15
O-290......................................... 1257 9/4/96 ............................................
O-290......................................... 1326 3/26/97 ............................................
O-290-D2...................................... 1082 9/26/95 L-6019-21
O-320......................................... 1018 2/22/95 ............................................
O-320......................................... 1024 3/17/95 ............................................
O-320......................................... 1038 5/13/95 L-39272-27A
O-320......................................... 1045 5/24/95 ............................................
O-320......................................... 1084 9/28/95 ............................................
O-320......................................... 1116 1/8/95 ............................................
O-320......................................... 1125 1/8/96 ............................................
O-320......................................... 1169 2/28/96 ............................................
O-320......................................... 1175 3/7/96 ............................................
O-320......................................... 1184 3/28/96 ............................................
O-320......................................... 1189 8/27/96 ............................................
O-320......................................... 1202 4/30/96 ............................................
O-320......................................... 1212 5/10/96 ............................................
O-320......................................... 1283 10/17/96 ............................................
O-320......................................... 1316 12/21/96 ............................................
O-320......................................... 1340 2/25/97 L-24367
O-320......................................... 1347 2/18/97 ............................................
O-320......................................... 1360 3/10/97 ............................................
O-320......................................... 1361 3/10/97 ............................................
O-320......................................... 1436 5/29/97 ............................................
O-320......................................... 1468 8/14/97 ............................................
O-320......................................... 1474 8/22/97 L-13130-39A
O-320......................................... 1477 9/13/97 ............................................
O-320......................................... 1477 9/13/97 ............................................
O-320......................................... 1507 11/18/97 ............................................
O-320......................................... 1519 11/21/97 ............................................
O-320......................................... 1546 12/7/97 ............................................
O-320......................................... 1171 3/1/06 ............................................
O-320-A....................................... 1192 4/13/96 ............................................
O-320-A....................................... 1194 4/13/96 ............................................
O-320-A....................................... 1196 4/13/96 ............................................
O-320-A1A..................................... 1244 8/13/96 L-5270-27
O-320-A2B..................................... 1081 9/22/95 ............................................
O-320-A2B..................................... 1461 9/9/97 L-12626-27
O-320-B2B..................................... 1452 7/10/97 L-2977-39
O-320-B2C..................................... 1315 12/17/96 ............................................
O-320-D2J..................................... 1172 3/4/96 L-13039-39A
O-320-D2J..................................... 1173 3/7/96 L-123412-39A
O-320-D2J..................................... 1253 9/4/96 ............................................
O-320-D2J..................................... 1534 11/25/97 ............................................
[[Page 44549]]
O-320-D2J..................................... 1539 12/3/97 ............................................
O-320-D3G..................................... 1077 9/17/95 ............................................
O-320-D3G..................................... 1114 1/8/96 L-10983-39A
O-320-D3G..................................... 1354 2/25/97 ............................................
O-320-D3G..................................... 1370 3/26/97 H45247
O-320-D3G..................................... 1544 12/3/97 ............................................
O-320-E2A..................................... 1103 11/10/95 L-26363-27A
O-320-E2A..................................... 1191 4/13/96 L-19377-27A
O-320-E2A..................................... 1317 12/21/96 L-15219-27A
O-320-E2A..................................... 1439 6/9/97 L-38003-55A
O-320-E2D..................................... 1068 8/10/95 L-35528-27A
O-320-E2D..................................... 1078 9/17/95 ............................................
O-320-E2D..................................... 1177 3/9/96 L-44732-27A
O-320-E2D..................................... 1181 3/14/96 ............................................
O-320-E2D..................................... 1241 8/9/96 L-42691-27A
O-320-E2D..................................... 1245 8/13/96 L-40483-27A
O-320-E2D..................................... 1260 9/9/96 L-15300-15
O-320-E2D..................................... 1343 2/17/97 ............................................
O-320-E2D..................................... 1346 3/2/97 L-44320-27A
O-320-E2D..................................... 1385 4/16/97 ............................................
O-320-E2D..................................... 1458 7/18/97 ............................................
O-320-E2D..................................... 1533 11/25/97 ............................................
O-320-E2D..................................... 1549 12/12/97 ............................................
O-320-E2G..................................... 1338 3/10/97 L-38264-27A
O-320-E3D..................................... 1034 4/18/95 L-29668-27A
O-320-E3D..................................... 1074 8/24/95 L-29495-27A
O-320-E3D..................................... 1431 6/9/97 L-33770-27A
O-320-E3D..................................... 1444 6/13/97 ............................................
O-320-E3D..................................... 1500 10/7/97 L-33841-27A
O-320-H2AD.................................... 1322 1/22/97 L-1530-78T
O-360......................................... 1025 3/17/95 ............................................
O-360......................................... 1157 2/7/96 ............................................
O-360......................................... 1199 4/18/96 ............................................
O-360......................................... 1362 3/10/97 ............................................
O-360......................................... 1386 4/17/97 ............................................
O-360......................................... 1394 5/6/97 ............................................
O-360......................................... 1528 11/19/97 ............................................
O-360-A1A..................................... 1170 2/28/96 L-20677-36A
O-360-A1A..................................... 1214 5/14/96 L-20190-36A
O-360-A1A..................................... 1239 8/5/96 ............................................
O-360-A1D..................................... 1411 5/5/97 ............................................
O-360-A3A..................................... 1531 11/25/97 ............................................
O-360-A4A..................................... 1270 9/27/96 L-14008-36A
O-360-A4A..................................... 1464 7/30/97 L-24796-36A
O-360-A4A..................................... 1486 9/6/97 ............................................
O-360-A4A..................................... 1529 11/25/97 ............................................
O-360-A4K..................................... 1166 2/22/96 L-26455-36A
O-360-B1B..................................... 1262 9/9/96 L-5261-51A
O-540-A1B5.................................... 1129 12/29/95 ............................................
O-540-A1B5.................................... 1132 1/9/96 L-1165-40
O-540-A1D5.................................... 1462 7/28/97 L-5661-40
IO-720........................................ 1510 10/26/97 ............................................
TIO-540-A2.................................... 1064 7/13/95 ............................................
TIO-540-A2.................................... 1111 1/10/96 ............................................
TIO-540-R2AD.................................. 1106 11/27/95 L-5949-61A
TCM:
A-65.......................................... 1152 1/25/96 ............................................
A-65.......................................... 1154 2/27/96 7187
A-65.......................................... 1183 2/22/96 ............................................
A-65.......................................... 1185 3/28/96 ............................................
A-65.......................................... 1233 6/23/96 ............................................
A-65.......................................... 1290 10/29/96 ............................................
A-65.......................................... 1296 11/14/96 4933868
A-65.......................................... 1299 11/19/96 ............................................
A-65.......................................... 1325 3/26/97 ............................................
A-65.......................................... 1326 3/26/97 ............................................
A-65.......................................... 1376 4/29/97 ............................................
A-65.......................................... 1438 6/17/97 5890178
A-65-3........................................ 1243 8/13/96 324993
A-65-8........................................ 1541 12/2/97 ............................................
A-65-8........................................ 1276 10/5/96 5762568
A75........................................... 1156 2/7/96 5321868
[[Page 44550]]
A75........................................... 1255 9/3/96 ............................................
A75........................................... 1256 9/4/96 ............................................
A75-8......................................... 1275 10/5/96 5162868
C75-12F....................................... 1293 11/4/96 3316-6-12
C85........................................... 1088 10/4/95 ............................................
C85........................................... 1092 10/18/95 ............................................
C-85.......................................... 1198 4/17/96 29652-7-8
C-85.......................................... 1297 11/14/96 ............................................
C-85.......................................... 1352 3/10/97 ............................................
C-85.......................................... 1381 4/28/97 ............................................
C-85.......................................... 1391 4/19/97 ............................................
C-85.......................................... 1392 4/19/97 ............................................
C-85.......................................... 1484 9/4/97 28487-6-12
C-85-8FJ...................................... 1139 1/17/96 29845-7-8
C-85-8FJ...................................... 1420 5/12/97 29465-7-8
C-85-12....................................... 1031 4/6/95 ............................................
C85-12........................................ 1182 3/18/96 21596-6-12
C-85-12....................................... 1217 5/15/96 ............................................
C85-12........................................ 1265 9/12/96 14657
C-85-12....................................... 1298 11/14/96 23610-6-12
C-90-8F....................................... 1471 9/6/97 42838-1-8
C-90-12....................................... 1279 10/7/96 44747-6-12
E-185-4....................................... 1124 1/16/96 25700D-1-9
E-225-8....................................... 1505 10/28/97 35477-D-9-8-P
GTSIO-520..................................... 1208 5/7/96 210114-70H
IO-360-C...................................... 1126 12/28/95 F-51439-9-C
IO-470........................................ 1028 3/23/95 87329-R
IO-470-N...................................... 1421 5/13/97 95271-1-N
IO-470-S...................................... 1331 3/11/97 102412-2-S-I
IO-520........................................ 1174 3/4/96 ............................................
IO-520-D...................................... 1167 2/22/96 ............................................
O-200......................................... 1033 4/18/95 ............................................
O-200......................................... 1043 5/12/95 ............................................
O-200......................................... 1049 6/2/95 ............................................
O-200......................................... 1076 9/11/95 214668-27A
O-200......................................... 1104 11/21/95 213830-71A
O-200......................................... 1131 1/5/96 ............................................
O-200......................................... 1142 1/18/96 265349-R
O-200......................................... 1147 1/23/96 ............................................
O-200......................................... 1190 4/13/96 ............................................
O-200......................................... 1193 4/13/96 ............................................
O-200......................................... 1195 4/13/96 ............................................
O-200......................................... 1197 4/17/96 ............................................
O-200......................................... 1213 5/13/96 ............................................
O-200......................................... 1261 9/9/96 ............................................
O-200......................................... 1303 12/5/96 ............................................
O-200......................................... 1321 2/7/97 28115
O-200......................................... 1324 2/6/97 ............................................
O-200......................................... 1344 3/2/97 ............................................
O-200......................................... 1393 5/5/97 ............................................
O-200......................................... 1413 5/7/97 61001-5-4
O-200......................................... 1430 5/23/97 ............................................
O-200......................................... 1437 6/17/97 255759A-48
O-200......................................... 1488 9/7/97 ............................................
O-200......................................... 1506 11/18/97 ............................................
O-200......................................... 1522 11/11/97 ............................................
O-200-A....................................... 1052 6/21/95 254150-A-48
O-200-A....................................... 1085 9/29/95 ............................................
O-200-A....................................... 1120 12/29/95 253971
O-200-A....................................... 1161 2/9/96 24R-469
O-200-A....................................... 1215 5/15/96 ............................................
O-200-A....................................... 1240 8/5/96 69589-8-A
O-200-A....................................... 1254 9/3/96 6105-71-A-R
O-200-A....................................... 1264 9/12/96 ............................................
O-200-A....................................... 1356 3/10/97 ............................................
O-300......................................... 1027 3/20/95 ............................................
O-300......................................... 1042 5/12/95 34012-D-6-D
O-300......................................... 1083 9/26/95 ............................................
O-300......................................... 1096 10/23/95 464481
O-300......................................... 1137 1/17/96 ............................................
O-300......................................... 1259 9/4/96 ............................................
O-300......................................... 1387 4/22/97 ............................................
[[Page 44551]]
O-300......................................... 1397 4/26/97 5928-9A
O-300......................................... 1403 4/28/97 ............................................
O-300......................................... 1423 6/9/97 3834D8Z
O-300......................................... 1555 1/13/98 ............................................
O-300-A....................................... 1446 6/27/97 ............................................
O-300-D....................................... 1022 3/17/95 35110-D-6-D
O-300-D....................................... 1079 9/17/95 24276-D-0-D
O-300-D....................................... 1487 9/6/97 ............................................
O-300-D....................................... 1543 12/3/97 ............................................
O-470......................................... 1046 6/1/95 ............................................
O-470......................................... 1383 4/4/97 ............................................
O-470-11...................................... 1017 2/22/95 ............................................
O-470-11...................................... 1491 10/19/97 ............................................
O-470-11...................................... 1492 10/19/97 ............................................
O-470-11...................................... 1493 10/19/97 ............................................
O-470-11...................................... 1494 10/19/97 ............................................
O-470-F....................................... 1236 7/25/96 76956-4-F
O-470-K....................................... 1087 10/3/95 47172-6-K
O-470-L....................................... 1128 1/10/96 68681-8-L
O-470-L....................................... 1359 5/19/97 68245-8-L
O-470-L....................................... 1399 4/28/97 ............................................
O-470-R....................................... 1016 2/10/95 133087-6-R
O-470-R....................................... 1086 10/3/95 ............................................
O-470-R....................................... 1165 2/22/96 ............................................
O-470-R....................................... 1178 3/10/96 ............................................
O-470-R....................................... 1201 6/2/96 83164-1-R
O-470-R....................................... 1319 1/6/97 459408
TSIO-520-VB................................... 1055 6/9/95 ............................................
--------------------------------------------------------------------------------------------------------------------------------------------------------
Note 1: Blank spaces indicate unknown data. Where the engine
serial number is blank in this table, it is either unknown or the
crankshaft may not be installed in an engine.
Note 2: This airworthiness directive (AD) applies to each engine
identified in the preceding applicability provision, regardless of
whether it has been modified, altered, or repaired in the area
subject to the requirements of this AD. For engines that have been
modified, altered, or repaired so that the performance of the
requirements of this AD is affected, the owner/operator must request
approval for an alternative method of compliance in accordance with
paragraph (c) of this AD. The request should include an assessment
of the effect of the modification, alteration, or repair on the
unsafe condition addressed by this AD; and, if the unsafe condition
has not been eliminated, the request should include specific
proposed actions to address it.
Compliance: Required as indicated, unless accomplished
previously.
To prevent crankshaft failure due to cracking, which could
result in an inflight engine failure and possible forced landing,
accomplish the following:
(a) Within 10 hours time in service after the effective date of
this AD, determine if this AD applies, as follows:
(1) Determine if any repair was conducted on the engine that
required crankshaft removal during the February 1, 1995, to December
31, 1997, time frame; if the engine was not disassembled for
crankshaft removal and repair in this time frame, no further action
is required.
(2) If the engine and crankshaft was repaired during this time
frame, determine from the maintenance records (engine log book), and
Table 1 of this AD if the crankshaft was repaired by Nelson
Balancing Service, Repair Station Certificate No. NB7R820J, Bedford,
Massachusetts. The maintenance records should contain the Return to
Service (Yellow) tag for the crankshaft that will identify the
company performing the repair. Also the work order number contained
in Table 1 of this AD was etched on the crankshaft propeller flange,
adjacent to the closest connecting rod journal. Because some etched
numbers will be difficult to see, if necessary, use a 10X magnifying
glass with an appropriate light source to view the work order
number. In addition, the propeller spinner, if installed, will have
to be removed in order to see this number.
(3) A person with a private pilot or higher rated certificate
may make the determination of applicability of this AD provided the
propeller spinner does not have to be removed.
(4) If it cannot be determined who repaired the crankshaft,
compliance with this AD is required.
(5) If the engine and crankshaft were not repaired during the
time frame specified in (a)(1), or if it is determined that the
crankshaft was not repaired by Nelson Balancing Service, no further
action is required.
(b) Within 10 hours time in service after the effective date of
this AD, accomplish the following:
(1) Perform a visual inspection as defined in paragraph (b)(2)
of this AD, magnetic particle inspection, and a dimensional check of
the crankshaft journals, or remove from service affected crankshafts
and replace with serviceable parts.
(2) For the purpose of this AD, a visual inspection of the
crankshaft is defined as the inspection of all surfaces of the
crankshaft for cracks which include heat check cracking of the
nitrided bearing surfaces, cracking in the main or aft fillet of the
main bearing journal and crankpin journal, including checking the
bearing surfaces for scoring, galling, corrosion, or pitting.
Note 3: Further guidance on all inspection and acceptance
criteria is contained in applicable TCM or LYC Overhaul or
Maintenance Manuals, or other FAA-approved data.
(3) Replace any crankshaft that fails the visual inspection,
magnetic particle inspection, or the dimensional check with a
serviceable crankshaft, unless the crankshaft can be reworked to
bring it in compliance with:
(i) All the overhaul requirements of the appropriate TCM or LYC
Overhaul/Maintenance Manuals; or
(ii) All of the FAA-approved requirements for any repair station
which currently has approval for limits other than those in the
appropriate TCM or LYC Overhaul/Maintenance Manuals.
(4) For the purpose of this AD, a serviceable crankshaft is one
which meets the requirements of paragraph (b)(3)(i) or (b)(3)(ii) of
this AD.
Note 4: Crankshafts removed from TCM engine models IO-360, IO-
520, and TSIO-520 series engines are also subject to compliance with
AD 97-26-17.
(c) An alternative method of compliance or adjustment of the
compliance time that
[[Page 44552]]
provides an acceptable level of safety may be used if approved by
the Manager, New York (LYC) or Atlanta (TCM) Aircraft Certification
Offices. Operators shall submit their requests through an
appropriate FAA Airworthiness Inspector, who may add comments and
then send it to the Manager, New York or Atlanta Aircraft
Certification Offices.
Note 5: Information concerning the existence of approved
alternative methods of compliance with this airworthiness directive,
if any, may be obtained from the Atlanta Aircraft Certification or
New York Aircraft Certification Office, as applicable.
(d) Special flight permits may be issued in accordance with
sections 21.197 and 21.199 of the Federal Aviation Regulations (14
CFR 21.197 and 21.199) to operate the aircraft to a location where
the requirements of this AD can be accomplished.
(e) This amendment becomes effective on October 19, 1998.
Issued in Burlington, Massachusetts, on August 11, 1998.
Jay J. Pardee,
Manager, Engine and Propeller Directorate, Aircraft Certification
Service.
[FR Doc. 98-22240 Filed 8-19-98; 8:45 am]
BILLING CODE 4910-13-M
