[Federal Register Volume 61, Number 115 (Thursday, June 13, 1996)]
[Rules and Regulations]
[Pages 29932-29934]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-14868]
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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39
[Docket No. 95-ANE-16; Amendment 39-9647; AD 96-12-05]
RIN 2120-AA64
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.
[[Page 29933]]
(formerly Textron Lycoming) LTS101 series turboshaft and LTP101 series
turboprop engines, that requires identifying, removing, and replacing
certain defective power turbine rotors. This amendment is prompted by
reports of workmanship deficiencies on certain power turbine rotors
that can reduce the published life limit of the disk. The actions
specified by this AD are intended to prevent power turbine rotor
failure, which could result in loss of engine power.
DATES: Effective August 12, 1996.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of August 12, 1996.
ADDRESSES: The service information referenced in this AD may be
obtained from AlliedSignal Engines, 111 South 34th Street, Phoenix, AZ
85072; telephone (602) 365-2493, fax (602) 365-2210. 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: Dave Keenan, Aerospace Engineer,
Engine Certification Office, FAA, Engine and Propeller Directorate, 12
New England Executive Park, Burlington, MA 01803-5299; telephone (617)
238-7139, 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 October 16, 1995 (60
FR 53548). That action proposed to require identifying, removing, and
replacing certain defective power turbine rotors in accordance with
Textron Lycoming Service Bulletins (SB's) No. LT101-72-50-0144, dated
January 15, 1993, and No. LT101-72-50-0145, dated November 27, 1991.
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 as proposed.
There are approximately 645 engines of the affected design in the
worldwide fleet. The FAA estimates that 430 engines installed on
aircraft of U.S. registry will be affected by this AD, that it will
take approximately 25 work hours per engine to accomplish the required
actions, and that the average labor rate is $60 per work hour. The
manufacturer has advised the FAA that all required hardware will be
provided at no cost to the operators. Based on these figures, the total
cost impact of the AD on U.S. operators is estimated to be $645,000.
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. 106(g), 40113, 44701.
Sec. 9.13 [Amended]
2. Section 39.13 is amended by adding the following new
airworthiness directive:
96-12-05 AlliedSignal, Inc.: Amendment 39-9647. Docket 95-ANE-16.
Applicability: AlliedSignal, Inc. (formerly Textron Lycoming)
LTS101 series turboshaft engines installed on, but not limited to,
the Eurocopter AS350 and SA366G1, Messerschmitt-Bolkow-Blohm/
Kawasaki MBB-BK117 and the Bell Helicopter Textron 222 aircraft, and
LTP101 series turboprop engines, installed on but not limited to,
the Piaggio P166DL and Airtractor AT302 aircraft.
Note: 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 use the
authority provided in paragraph (c) to request approval from the
Federal Aviation Administration (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 power turbine rotor failure, which could result in
loss of engine power, accomplish the following:
(a) For all LTS101 series turboshaft engines except the LTS101-
750B2 model, and all LTP101 series turboprop engines, remove and
replace power turbine rotors identified in Table 1 of Textron
Lycoming Service Bulletin (SB) No. LT101-72-50-0144, dated January
15, 1993, in accordance with the accomplishment procedures in
Textron Lycoming SB No. LT101-72-50-0144, dated January 15, 1993,
and the following schedule:
(1) For power turbine rotors with more than 1,000 hours time
since new (TSN) on the effective date of this AD, remove and replace
within the next 50 hours time in service (TIS), not to exceed 1,800
cycles since new (CSN).
(2) For power turbine rotors with 1,000 hours TSN or less, but
more than 800 hours TSN on the effective date of this AD, remove and
replace within the next 100 hours TIS, not to exceed 1,800 CSN.
(3) For power turbine rotors with 800 hours TSN or less, but
more than 400 hours TSN on the effective date of this AD, remove and
replace within the next 150 hours TIS, not to exceed 1,800 CSN.
(4) For power turbine rotors with 400 hours TSN or less on the
effective date of this AD, remove and replace no later than 600
hours TSN, not to exceed 1,800 CSN.
[[Page 29934]]
(b) For all LTS101-750B2 model engines, remove and replace power
turbine rotors, in accordance with the accomplishment procedures of
Textron Lycoming SB No. LT101-72-50-0145 dated November 27, 1991,
within the next 100 hours TIS after the effective date of this AD,
or 800 hours TSN on the power turbine rotor, whichever occurs first.
(c) 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.
(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) The actions required by this AD shall be done in accordance
with the following Textron Lycoming SB's:
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Document No. Pages Revision Date
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LT101-72-50-0144.............. 1-9 Original...... Jan. 15, 1993.
Total Pages: 9.
LT101-72-50-0145.............. 1-3 Original...... Nov. 27, 1991.
Total Pages: 3.
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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 Engines, 111 South
34th Street, Phoenix, AZ 85072; telephone (602) 365-2493, fax (602)
365-2210. 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.
(f) This amendment becomes effective on August 12, 1996.
Issued in Burlington, Massachusetts, on May 29, 1996.
Robert E. Guyotte,
Acting Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 96-14868 Filed 6-12-96; 8:45 am]
BILLING CODE 4910-13-U
