[Federal Register Volume 60, Number 149 (Thursday, August 3, 1995)]
[Rules and Regulations]
[Pages 39637-39638]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-18551]
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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39
[Docket No. 94-ANE-64; Amendment 39-9323; AD 95-16-04]
Airworthiness Directives; AlliedSignal, Inc. (Formerly Textron
Lycoming) LTS101 Series Turboshaft and LTP101 Series Turboprop Engines
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule.
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SUMMARY: This amendment adopts a new airworthiness directive (AD),
applicable to AlliedSignal Inc. LTS101 series turboshaft and LTP101
series turboprop engines, that requires replacement of cast material
axial compressor rotors with wrought material axial compressor rotors
that have improved fatigue characteristics and material properties.
This amendment is prompted by 36 reports of axial compressor blade
failures on cast rotors. The actions specified by this AD are intended
to prevent engine power loss and inflight engine shutdown.
DATES: Effective October 2, 1995.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of October 2, 1995.
ADDRESSES: The service information referenced in this AD may be
obtained from AlliedSignal, Inc., 550 Main Street, Stratford, CT 06497.
This information may be examined at the Federal Aviation Administration
(FAA), New England Region, Office of the Assistant Chief Counsel, 12
New England Executive Park, Burlington, MA; or at the Office of the
Federal Register, 800 North Capitol Street, NW., suite 700, Washington,
DC.
FOR FURTHER INFORMATION CONTACT: Eugene Triozzi, Aerospace Engineer,
Engine Certification Office, FAA, Engine and Propeller Directorate, 12
New England Executive Park, Burlington, MA 01803-5299; telephone (617)
238-7148, fax (617) 238-7199.
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 AlliedSignal Inc. (formerly
Textron Lycoming) LTS101 series turboshaft and LTP101 series turboprop
engines was published in the Federal Register on January 4, 1995 (60 FR
393). That action proposed to require replacing cast material axial
compressor rotors with wrought material axial compressor rotors that
have improved fatigue characteristics and material properties, in
accordance with Textron Lycoming Service Bulletin No. LT 101-72-30-
0088, Revision 5, dated September 25, 1992.
On October 28, 1994, AlliedSignal Inc. purchased the turbine engine
product line of Textron Lycoming, and this final rule has been revised
to refer to the engine by its new name.
Interested persons have been afforded an opportunity to participate
in the making of this amendment. No comments were received on the
proposal or the FAA's determination of the cost to the public. The FAA
has determined that air safety and the public interest require the
adoption of the rule with the change described previously.
There are approximately 200 engines of the affected design in the
worldwide fleet. The FAA estimates that 100 engines installed on
aircraft of U.S. registry will be affected by this AD, that it will
take approximately 50 work hours per engine to accomplish the required
actions, and that the average labor rate is $60 per work hour. Required
parts will cost approximately $6,500 per engine, on a prorated cost
basis. Based on these figures, the total cost impact of the AD on U.S.
operators is estimated to be $955,000.
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 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, Incorporation by
reference, 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. App. 1354(a), 1421 and 1423; 49 U.S.C.
106(g); and 14 CFR 11.89.
Sec. 39.13 [Amended]
2. Section 39.13 is amended by adding the following new
airworthiness directive:
95-16-04 AlliedSignal, Inc.: Amendment 39-9323. Docket 94-ANE-64.
Applicability: AlliedSignal, Inc. (formerly Textron Lycoming)
LTS101 turboshaft and LTP101 turboprop engines installed on but not
limited to Aerospatiale AS 350 and SA366G, Bell 222, and
Messerschmitt-Bolkow-Blohm (MBB) BK117 helicopters; Piaggio P166-DL3
and Airtractor AT302 airplanes. NOTE: This AD applies to each
[[Page 39638]]
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 use the
authority provided in paragraph (b) to request approval from the
FAA. This approval may address either no action, if the current
configuration eliminates the unsafe condition, or different actions
necessary to address the unsafe condition described in this AD. Such
a request should include an assessment of the effect of the changed
configuration on the unsafe condition addressed by this AD. In no
case does the presence of any modification, alteration, or repair
remove any engine from the applicability of this AD.
Compliance: Required as indicated, unless accomplished
previously.
To prevent engine power loss and inflight engine shutdown,
accomplish the following:
(a) Remove from service Part Numbers (P/N) 4-101-006- 20, -21, -
24, -26, -35, -36, and -40 cast material axial compressor rotors, as
follows:
(1) For axial compressor rotors P/N 4-101-006-35 with serial
number suffix ``E,'' remove in accordance with Textron Lycoming
Service Bulletin (SB) No. LT 101-72-30-0088, Revision 5, dated
September 25, 1992, within 50 hours time in service (TIS), or 60
days after the effective date of this AD, whichever occurs first.
(2) For axial compressor rotors P/N 4-101-006-35 with serial
number suffix other than ``E,'' and all other axial compressor
rotors with P/N listed in paragraph (a) of this airworthiness
directive (AD), remove in accordance with Textron Lycoming SB No. LT
101-72-30-0088, Revision 5, dated September 25, 1992, as follows:
(i) For axial compressor rotors that have accumulated 600 hours
or less TIS since new, remove within 100 hours TIS, or 120 days
after the effective date of this AD, whichever occurs first.
(ii) For axial compressor rotors that have accumulated more than
600 but less than or equal to 1,200 hours TIS since new, remove
within 300 hours TIS, or 240 days after the effective date of this
AD, whichever occurs first.
(iii) For axial compressor rotors that have accumulated more
than 1,200 but less than or equal to 2,400 hours TIS since new,
remove within 600 hours TIS, or 360 days after the effective date of
this AD, whichever occurs first.
(iv) For axial compressor rotors that have accumulated more than
2,400 hours TIS since new, remove within 1,200 hours TIS, or 720
days after the effective date of this AD, whichever occurs first.
(3) Replace with a serviceable wrought material axial compressor
rotor P/N 4-101-006-28, -32, -39, or -41, as applicable, in
accordance with Textron Lycoming SB No. LT 101-72-30-0088, Revision
5, dated September 25, 1992.
(b) An alternative method of compliance or adjustment of the
compliance time that provides an acceptable level of safety may be
used if approved by the Manager, Engine Certification Office. The
request should be forwarded through an appropriate FAA Principal
Maintenance Inspector, who may add comments and then send it to the
Manager, Engine Certification Office.
Note: Information concerning the existence of approved
alternative methods of compliance with this airworthiness directive,
if any, may be obtained from the Engine Certification Office.
(c) 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.
(d) The actions required by this AD shall be done in accordance
with the following SB:
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Document No. Pages Revision Date
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Textron Lycoming SB No. LT 101- 1-4 5 September 25, 1992.
72-30-0088.
Total Pages: 5.
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This incorporation by reference was approved by the Director of
the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR
part 51. Copies may be obtained from AlliedSignal, Inc., 550 Main
Street, Stratford, CT 06497. Copies may be inspected at the FAA, New
England Region, Office of the Assistant Chief Counsel, 12 New
England Executive Park, Burlington, MA; or at the Office of the
Federal Register, 800 North Capitol Street NW., suite 700,
Washington, DC.
(e) This amendment becomes effective on October 2, 1995.
Issued in Burlington, Massachusetts, on July 20, 1995.
James C. Jones,
Acting Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 95-18551 Filed 7-31-95; 10:37 am]
BILLING CODE 4910-13-U
