AD 96-12-05

[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:

------------------------------------------------------------------------
         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