[Federal Register Volume 61, Number 119 (Wednesday, June 19, 1996)]
[Rules and Regulations]
[Pages 31007-31009]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-15383]



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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 93-ANE-64; Amendment 39-9668; AD 96-12-27]
RIN 2120-AA64


Airworthiness Directives; AlliedSignal Inc. (formerly Textron 
Lycoming) LTS 101 Series Turboshaft and LTP 101 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. (formerly Textron Lycoming) LTS 101 
series turboshaft and LTP 101 series turboprop engines, that requires 
removal from service of suspect disks for a one-time inspection of the 
disk tenon area of the gas generator turbine disk. This amendment is 
prompted by a report of a gas generator turbine disk tenon failure. The 
actions specified by this AD are intended to prevent total loss of 
engine power, inflight engine shutdown, and possible damage to the 
aircraft.

DATES: Effective August 19, 1996.

[[Page 31008]]

    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of August 19, 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: 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) LTS 101 series turboshaft and LTP 101 series 
turboprop engines was published in the Federal Register on May 15, 1995 
(60 FR 25869). That action proposed to require a one-time inspection of 
the disk tenon area of the gas generator turbine disk in accordance 
with Textron Lycoming Service Bulletin (SB) No. LT 101-72-50-0150, 
dated September 1, 1993.
    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.
    The FAA estimates that 618 engines installed on aircraft of U.S. 
registry will be affected by this AD, that it will take approximately 
6.5 work hours per engine to accomplish the required actions, and that 
the average labor rate is $60 per work hour. AlliedSignal Inc. has 
advised that they will supply disks or rotors on an exchange basis at 
no cost to the operator. Based on these figures, the total cost impact 
of the AD on U.S. operators is estimated to be $229,896.
    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. 39.13  [Amended]

    2. Section 39.13 is amended by adding the following new 
airworthiness directive:

96-12-27  AlliedSignal Inc.: Amendment 39-9668. Docket 93-ANE-64.

    Applicability: AlliedSignal Inc. (formerly Textron Lycoming) LTS 
101 series turboshaft and LTP 101 series turboprop engines installed 
on but not limited to Aerospatiale AS 350 and SA366G, Bell 222, and 
Messerschmitt-Bolkow-Blohm (MBB) BK117 helicopters; and Piaggio 
P166-DL3 and Airtractor AT302 airplanes.

    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 (b) 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 total loss of engine power, inflight engine shutdown, 
and possible damage to the aircraft, accomplish the following:
    (a) Remove from service suspect disks and perform a one-time 
inspection of the disk tenon area of the gas generator turbine disk, 
and replace, if necessary, with a serviceable part, in accordance 
with Textron Lycoming Service Bulletin (SB) No. LT 101-72-50-0150, 
dated September 1, 1993, as follows:
    (1) For disks with greater than 5,000 cycles since new (CSN) on 
the effective date of this AD, remove within 235 cycles in service 
(CIS).
    (2) For disks with 4,501 to 5,000 CSN on the effective date of 
this AD, remove within 285 CIS.
    (3) For disks with 4,001 to 4,500 CSN on the effective date of 
this AD, remove within 350 CIS.
    (4) For disks with 3,501 to 4,000 CSN on the effective date of 
this AD, remove within 450 CIS.
    (5) For disks with 3,001 to 3,500 CSN on the effective date of 
this AD, remove within 600 CIS.
    (6) For disks with 2,501 to 3,000 CSN on the effective date of 
this AD, remove within 800 CIS, or prior to accumulating 3,400 CSN, 
whichever occurs later.
    (7) For disks with 2,001 to 2,500 CSN on the effective date of 
this AD, remove within 1,100 CIS, or prior to accumulating 3,400 
CSN, whichever occurs later.
    (8) For disks with less than 2,000 CSN on the effective date of 
this AD, remove prior to accumulating 3,400 CSN.
    (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:

[[Page 31009]]



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                                           Document                                                             
                                              No.         Pages  revision                     Date              
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Textron Lycoming, SB No. LT 101-72-50-         1-6   Original.................  September 1, 1993.              
 0150.                                                                                                          
Total Pages: 6.                                                                                                 
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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.
    (e) This amendment becomes effective on August 19, 1996.

    Issued in Burlington, Massachusetts, on June 3, 1996.
James C. Jones,
Acting Manager, Engine and Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 96-15383 Filed 6-18-96; 8:45 am]
BILLING CODE 4910-13-U