[Federal Register Volume 61, Number 197 (Wednesday, October 9, 1996)]
[Rules and Regulations]
[Pages 52876-52877]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-25168]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 95-ANE-68; Amendment 39-9743; AD 96-18-17]
RIN 2120-AA64
Airworthiness Directives; AlliedSignal Inc. TSCP700-4B, -4E, and
-5 Auxiliary Power Units
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) TSCP700-4B, -4E, and
-5 auxiliary power units (APUs), that requires removal from service of
certain high pressure turbine (HPT) disks identified by serial number,
and replacement with serviceable parts. This amendment is prompted by
the discovery of a material defect in certain HPT disk forgings that
may result in HPT disk rupture prior to reaching the disk cyclic life
limit. The actions specified by this AD are intended to prevent an HPT
disk rupture.
DATES: Effective December 9, 1996.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of December 9, 1996.
ADDRESSES: The service information referenced in this AD may be
obtained from AlliedSignal Engines, P.O. Box 52181, Phoenix, AZ 85072-
2181; telephone (800) 338-3378, fax (602) 231-4402. 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: Robert Baitoo, Aerospace Engineer, Los
Angeles Aircraft Certification Office, FAA, Transport Airplane
Directorate, 3960 Paramount Blvd., Lakewood, CA 90712-4137; telephone
(310) 627-5245; 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) Models TSCP700-4B, -4E, and -5 auxiliary power units (APUs)
was published in the Federal Register on March 26, 1996 (61 FR 13113).
That action proposed to require removal from service of certain high
pressure turbine (HPT) disks identified by serial number, and
replacement with serviceable parts, prior to accumulating 7,500 cycles
since new (CSN), or 3 years after the effective date of this AD,
whichever occurs first. The actions are required to be accomplished in
accordance with AlliedSignal Aerospace Service Bulletin (SB) No.
TSCP700-49-A7168, dated November 7, 1995.
Interested persons have been afforded an opportunity to participate
in the making of this amendment. Due consideration has been given to
the comments received.
Four commenters support the rule as proposed.
After careful review of the available data, including the comments
noted above, the FAA has determined that air safety and the public
interest require the adoption of the rule as proposed.
There are approximately 31 APUs of the affected design in the
worldwide fleet. The FAA estimates that 20 APUs installed on aircraft
of U.S. registry will be affected by this AD, that it will take no
additional work hours if the disk is replaced during overhaul. The
manufacturer has advised the FAA that they will supply required parts
at no charge to the operator. The FAA has therefore determined that
this AD will impose no additional cost on U.S. operators.
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
[[Page 52877]]
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:
96-18-17 AlliedSignal Inc.: Amendment 39-9743. Docket 95-ANE-68.
Applicability: AlliedSignal Inc. (formerly Garrett) Models
TSCP700-4B, -4E, and -5 auxiliary power units (APUs), with high
pressure turbine (HPT) disks identified by serial number in
AlliedSignal Aerospace Service Bulletin (SB) No. TSCP700-49-A7168,
dated November 7, 1995. These APUs are installed on, but not limited
to, McDonnell Douglas DC-10, KC-10 (military), and MD-11 series, and
Airbus A300 series aircraft.
Note: This airworthiness directive (AD) applies to each APU
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 APUs that have been
modified, altered, or repaired so that the performance of the
requirements of this AD is affected, the owner/operator must request
approval for an alternative method of compliance in accordance with
paragraph (d) of this AD. The request should include an assessment
of the effect of the modification, alteration, or repair on the
unsafe condition addressed by this AD; and, if the unsafe condition
has not been eliminated, the request should include specific
proposed actions to address it.
Compliance: Required as indicated, unless accomplished
previously.
To prevent an HPT disk rupture, accomplish the following:
(a) Prior to accumulating 7,500 cycles since new (CSN), or 3
years after the effective date of this AD, whichever occurs first,
remove from service affected HPT disks and replace with a
serviceable part.
(b) The definition of a disk cycle may be found in the
applicable AlliedSignal Inc. APU Component Maintenance Manual.
(c) Auxiliary power unit maintenance records may be used to
determine if the HPT disk installed in the APU has a serial number
listed in AlliedSignal Aerospace SB No. TSCP700-49-A7168, dated
November 7, 1995.
(d) 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.
(e) 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.
(f) The actions required by this AD shall be done in accordance
with the following AlliedSignal Aerospace SB:
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Document No. Pages Date
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TSCP700-49-A7168..................... 1-8 Nov. 7, 1995.
Total Pages: 8.
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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, P.O. Box
52181, Phoenix, AZ 85072-2181; telephone (800) 338-3378, fax (602)
231-4402. 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.
(g) This amendment becomes effective on December 9, 1996.
Issued in Burlington, Massachusetts, on September 20, 1996.
James C. Jones,
Acting Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 96-25168 Filed 10-8-96; 8:45 am]
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