[Federal Register Volume 60, Number 74 (Tuesday, April 18, 1995)]
[Rules and Regulations]
[Pages 19343-19344]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-8827]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 94-ANE-42; Amendment 39-9181; AD 95-07-02]
Airworthiness Directives; AlliedSignal Inc. TFE731-3 Series
Turbofan 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 Garrett Turbine Engine
Company) TFE731-3 series turbofan engines, that requires the removal of
suspect low pressure turbine (LPT) disks due to their susceptibility to
creep fatigue. This amendment is prompted by reports of LPT disks that
have separated through the disk web due to creep fatigue. The actions
specified by this AD are intended to prevent an LPT disk web
separation, which may result in an uncontained engine failure and
damage to the aircraft.
DATES: Effective on June 19, 1995.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of June 19, 1995.
ADDRESSES: The service information referenced in this AD may be
obtained from AlliedSignal Inc., Aviation Services Division, Data
Distribution, Dept. 6403/2102-201, P.O. Box 29003, Phoenix, AZ 85038-
9003; telephone (602) 365-2548, 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: Joseph Costa, Aerospace Engineer, Los
Angeles Aircraft Certification Office, FAA, Transport Airplane
Directorate, 3960 Paramount Blvd., Lakewood, CA 90712-4137; telephone
(310) 627-5246; fax (310) 627-5210.
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
Garrett Turbine Engine Company) TFE731-3 series turbofan engines was
published in the Federal Register on November 29, 1994 (59 FR 60922).
That action proposed to require removal of suspect specific serial
numbered first and second stage low pressure turbine (LPT) disks in
accordance with AlliedSignal Aerospace Alert Service Bulletin (ASB) No.
TFE731-A72-3544, dated October 8, 1993, and ASB No. TFE731-A72-3557,
dated May 12, 1994.
Interested persons have been afforded an opportunity to participate
in the making of this amendment. No comments were received on the
proposal. The Federal Aviation Administration's (FAA) has determined
that the average labor rate has increased since publication of the NPRM
to $60 per work hour. The economic analysis of this final rule has been
changed accordingly. The FAA has determined that air safety and the
public interest require the adoption of the rule with the changes
described previously. The FAA has determined that these changes will
not increase the scope of the AD. [[Page 19344]]
There are approximately 350 engines with the affected serial
numbered disks in the worldwide fleet. The FAA estimates that 175
engines installed on aircraft of U.S. registry will be affected by this
AD, that it will take approximately 10 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 $18,000 per
engine. Based on these figures, the total cost impact of the AD on U.S.
operators is estimated to be $3,255,000.
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:
95-07-02 AlliedSignal Inc.: Amendment 39-9181. Docket 94-ANE-42.
Applicability: AlliedSignal Inc. (formerly Garrett Turbine
Engine Company) TFE731-3, -3A, -3AR, -3B, -3BR, and -3R turbofan
engine models installed on but not limited to Avions Marcel Dassault
Falcon 50, Lockheed 1329-23, -25 series (731 Jetstar, Jetstar II),
Israel Aircraft Industries (IAI) Ltd. 1124 (Westwind), Raytheon
Corporate Jets Inc. (formerly British Aerospace) (BAe) DH/HS/BH 125
series, Learjet 55 series, Cessna 650 Citation III, VI, Sabreliner
NA-265 series (Sabreliner 65). This airworthiness directive (AD) is
not applicable to TFE731-3A-300G and TFE731-3AR-200G engines
installed on IAI 1125 Westwind Astra aircraft.
Compliance: Required as indicated, unless accomplished
previously.
To prevent a low pressure turbine (LPT) disk web separation,
which may result in an uncontained engine failure and damage to the
aircraft, accomplish the following:
(a) Remove from service first and second stage LPT disks, with
Part Numbers (P/N) 3072351-(), 3072542-(), 3073113-(), and 3073114-
(), where () denotes any dash number, identified by serial number in
the Compliance Sections of AlliedSignal Aerospace Alert Service
Bulletin (ASB) No. TFE731-A72-3544, dated October 8, 1993, and
AlliedSignal Aerospace ASB No. TFE731-A72-3557, dated May 12, 1994,
within 1,500 hours time in service (TIS) after the effective date of
this AD, or at the next removal of the LPT assembly, whichever
occurs first, in accordance with the Accomplishment Instructions of
AlliedSignal Aerospace ASB No. TFE731-A72-3544, dated October 8,
1993, and AlliedSignal Aerospace ASB No. TFE731-A72-3557, dated May
12, 1994, and replace with serviceable disks.
(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, Los Angeles Aircraft 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, Los Angeles Aircraft Certification Office.
Note: Information concerning the existence of approved
alternative methods of compliance with this airworthiness directive,
if any, may be obtained from the Los Angeles Aircraft 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 removal and replacement of the affected disks shall be
done in accordance with the following AlliedSignal Aerospace ASB's:
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Document No. Pages Date
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ASB No. TFE731-A72-3544........................... 1-10 Oct. 8,
1993.
Total Pages: 10.
ASB No. TFE731-A72-3557........................... 1-12 May 12,
1994.
Total Pages: 12.
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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., Aviation
Services Division, Data Distribution, Dept. 6403/2102-201, P.O. Box
29003, Phoenix, AZ 85038-9003; telephone (602) 365-2548, 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 June 19, 1995.
Issued in Burlington, Massachusetts, on March 22, 1995.
James C. Jones,
Acting Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 95-8827 Filed 4-17-95; 8:45 am]
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