[Federal Register Volume 61, Number 135 (Friday, July 12, 1996)]
[Rules and Regulations]
[Pages 36620-36622]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-17533]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 96-ANE-10; Amendment 39-9676; AD 96-13-08]
RIN 2120-AA64
Airworthiness Directives; Pratt & Whitney PW4000 Series Turbofan
Engines
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule; request for comments.
-----------------------------------------------------------------------
SUMMARY: This amendment adopts a new airworthiness directive (AD) that
is applicable to Pratt & Whitney (PW) PW4000 series turbofan engines.
This action requires initial and repetitive inspections of the aft
cascade support frame assembly of thrust reverser for cracks, and
replacement, if necessary, with serviceable parts; or lockout of the
thrust reversers. This amendment is prompted by reports of aft cascade
support frame assembly failures. The actions specified in this AD are
intended to prevent aft cascade support frame assembly failure due to
cracks, which can result in thrust reverser
[[Page 36621]]
hardware liberation and ejection from the aircraft during thrust
reverser operation, which can contaminate the runway with debris,
causing an operational hazard to other aircraft during takeoff and
landing.
DATES: Effective August 1, 1996.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of August 1, 1996.
Comments for inclusion in the Rules Docket must be received on or
before September 10, 1996.
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), New England Region, Office of the Assistant Chief
Counsel, Attention: Rules Docket No. 96-ANE-10, 12 New England
Executive Park, Burlington, MA 01803-5299. Comments may also be
submitted to the Rules Docket by using the following Internet address:
epd-adcomments@mail.hq.faa.gov''. All comments must contain the
Docket No. in the subject line of the comment.
The service information referenced in this AD may be obtained from
Pratt & Whitney, 400 Main St., East Hartford, CT 06108; telephone (860)
565-6600, fax (860) 565-4503. This information may be examined 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.
FOR FURTHER INFORMATION CONTACT: Chris Gavriel, Aerospace Engineer,
Engine Certification Office, FAA, Engine and Propeller Directorate, 12
New England Executive Park, Burlington, MA 01803-5299; telephone (617)
238-7147, fax (617) 238-7199.
SUPPLEMENTARY INFORMATION: The Federal Aviation Administration (FAA)
has received reports of thrust reverser failure on Pratt & Whitney (PW)
PW4000 series turbofan engines. The thrust reverser aft cascade support
frame assembly can develop cracks due to high cycle fatigue that could
propagate to failure. To date, there have been a total of 38 aft
cascade support frame assemblies that were found either cracked or
failed. Failure of the cascade support assembly allows thrust reverser
hardware to be liberated and ejected from the aircraft during thrust
reverser operation. Seven of the failed assemblies caused liberations
of thrust reverser hardware. It is possible that other aircrews, either
departing or arriving on the same runway, may not see debris left on
the runway after a failure of the thrust reverser aft cascade support
frame assembly. This debris, therefore, could cause a serious unsafe
condition for departing and arriving aircraft. This condition, if not
corrected, could result in aft cascade support frame assembly failure
due to cracks, which can result in thrust reverser hardware liberation
and ejection from the aircraft during thrust reverser operation, which
can contaminate the runway with debris, causing an operational hazard
to other aircraft during takeoff and landing.
The FAA has reviewed and approved the technical contents of PW
Service Bulletin (SB) No. PW4NAC 78-78, Revision 6, dated March 6,
1996, and SB No. PW4MD11 78-67, Revision 5, dated March 6, 1996, that
describe procedures for inspection of the aft cascade support frame
assembly.
Since an unsafe condition has been identified that is likely to
exist or develop on other engines of the same type design, this AD is
being issued to prevent aft cascade support frame assembly failure.
This AD requires initial and repetitive inspections of the aft cascade
support frame assembly for cracks, and replacement, if necessary, with
serviceable parts; or lockout of the thrust reversers in accordance
with the applicable Aircraft Maintenance Manual for a time period not
to exceed 10 days. The actions are required to be accomplished in
accordance with the SB's described previously.
Since a situation exists that requires the immediate adoption of
this regulation, it is found that notice and opportunity for prior
public comment hereon are impracticable, and that good cause exists for
making this amendment effective in less than 30 days.
Comments Invited
Although this action is in the form of a final rule that involves
requirements affecting flight safety and, thus, was not preceded by
notice and an opportunity for public comment, comments are invited on
this rule. Interested persons are invited to comment on this rule by
submitting such written data, views, or arguments as they may desire.
Communications should identify the Rules Docket number and be submitted
in triplicate to the address specified under the caption ADDRESSES. All
communications received on or before the closing date for comments will
be considered, and this rule may be amended in light of the comments
received. Factual information that supports the commenter's ideas and
suggestions is extremely helpful in evaluating the effectiveness of the
AD action and determining whether additional rulemaking action would be
needed.
Comments are specifically invited on the overall regulatory,
economic, environmental, and energy aspects of the rule that might
suggest a need to modify the rule. All comments submitted will be
available, both before and after the closing date for comments, in the
Rules Docket for examination by interested persons. A report that
summarizes each FAA-public contact concerned with the substance of this
AD will be filed in the Rules Docket.
Commenters wishing the FAA to acknowledge receipt of their comments
submitted in response to this notice must submit a self-addressed,
stamped postcard on which the following statement is made: ``Comments
to Docket Number 96-ANE-10.'' The postcard will be date stamped and
returned to the commenter.
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.
The FAA has determined that this regulation is an emergency
regulation that must be issued immediately to correct an unsafe
condition in aircraft, and is not a ``significant regulatory action''
under Executive Order 12866. It has been determined further that this
action involves an emergency regulation under DOT Regulatory Policies
and Procedures (44 FR 11034, February 26, 1979). If it is determined
that this emergency regulation otherwise would be significant under DOT
Regulatory Policies and Procedures, a final regulatory evaluation will
be prepared and placed in the Rules Docket. A copy of it, if filed, 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:
[[Page 36622]]
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:
96-13-08 Pratt & Whitney: Amendment 39-9676. Docket 96-ANE-10.
Applicability: Pratt & Whitney (PW) PW4000 series turbofan
engines, with thrust reverser, Supplemental Type Certificate (STC)
No. SJ514NE, installed on Airbus A300-600 and A310 series aircraft,
and thrust reverser, STC No. SE744NE, installed on McDonnell Douglas
MD-11 series aircraft. These thrust reversers incorporate aft
cascade support frame assemblies, Part Numbers (P/N's) 221-0516-503
and 221-0516-504.
Note: This airworthiness directive (AD) applies to each engine
with affected thrust reversers 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 with affected thrust reversers 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 with affected
thrust reversers from the applicability of this AD.
Compliance: Required as indicated, unless accomplished
previously.
To prevent aft cascade support frame assembly failure due to
cracks, which can result in thrust reverser hardware liberation and
ejection from the aircraft during thrust reverser operation, which
can contaminate the runway with debris, causing an operational
hazard to other aircraft during takeoff and landing, accomplish the
following:
(a) For engines with affected thrust reversers installed on
Airbus A300-600 and A310 series aircraft, accomplish the following:
(1) Initially inspect aft cascade support frame assemblies for
cracks within 250 flight hours after the effective date of this AD,
in accordance with the Accomplishment Instructions, Part 1--Interim
Inspection, of PW Service Bulletin (SB) No. PW4NAC 78-78, Revision
6, dated March 6, 1996.
(2) Thereafter, inspect aft cascade support frame assemblies for
cracks at intervals not to exceed 450 flight hours since the last
inspection, in accordance with the Accomplishment Instructions, Part
1--Interim Inspection, of PW SB No. PW4NAC 78-78, Revision 6, dated
March 6, 1996.
(3) For aft cascade support frame assemblies that do not meet
the return to service criteria stated in the Accomplishment
Instructions, Part 1--Interim Inspection, of PW SB No. PW4NAC 78-78,
Revision 6, dated March 6, 1996, prior to further flight, accomplish
either of the following:
(i) Remove from service cracked aft cascade support frame
assemblies, and replace with a serviceable part; or
(ii) Lockout the thrust reverser in accordance with the Airbus
A300-600 and A310 series Aircraft Maintenance Manuals, as
applicable, for a time period not to exceed 10 days. At the
conclusion of the 10-day lockout period, prior to further flight
remove any cracked aft cascade support frame assemblies and replace
with serviceable parts.
(b) For engines with affected thrust reversers installed on
McDonnell Douglas MD-11 series aircraft, accomplish the following:
(1) Initially inspect aft cascade support frame assemblies for
cracks within 250 flight hours after the effective date of this AD,
in accordance with the Accomplishment Instructions, Part 1--Interim
Inspection, of PW SB No. PW4MD11 78-67, Revision 5, dated March 6,
1996.
(2) Thereafter, inspect aft cascade support frame assemblies for
cracks at intervals not to exceed 450 flight hours since the last
inspection, in accordance with the Accomplishment Instructions, Part
1--Interim Inspection, of PW SB No. PW4MD11 78-67, Revision 5, dated
March 6, 1996.
(3) For aft cascade support frame assemblies that do not meet
the return to service criteria stated in the Accomplishment
Instructions, Part 1--Interim Inspection, of PW SB No. PW4MD11 78-
67, Revision 5, dated March 6, 1996, prior to further flight,
accomplish either of the following:
(i) Remove from service cracked aft cascade support frame
assemblies, and replace with a serviceable part; or
(ii) Lockout the thrust reverser in accordance with the
McDonnell Douglas MD-11 series Aircraft Maintenance Manual, for a
time period not to exceed 10 days. At the conclusion of the 10-day
lockout period, prior to further flight remove any cracked aft
cascade support frame assemblies and replace with serviceable parts.
(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 PW SB's:
------------------------------------------------------------------------
Document No. Pages Revision Date
------------------------------------------------------------------------
PW4NAC 78-78................... 1........ 6 March 6, 1996.
2,3...... 2 October 31, 1995.
4-6...... 6 March 6, 1996.
7........ 5 October 31, 1995.
8-11..... 6 March 6, 1996.
12....... 5 October 31, 1995.
13-19.... 6 March 6, 1996.
20-22.... 5 October 31, 1995.
23-34.... 6 March 6, 1996.
35....... 5 October 31, 1995.
36, 37... 6 March 6, 1996.
38....... 5 October 31, 1995.
39, 40... 6 March 6, 1996.
Total pages: 40.......
PW4MD11 78-67.................. 1-38..... 5 March 6, 1996.
Total pages: 38.......
------------------------------------------------------------------------
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 Pratt & Whitney, 400 Main St.,
East Hartford, CT 06108; telephone (860) 565-6600, fax (860) 565-
4503. 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 1, 1996.
Issued in Burlington, Massachusetts, on July 2, 1996.
Jay J. Pardee,
Manager, Engine and Propeller Directorate, Aircraft Certification
Service.
[FR Doc. 96-17533 Filed 7-11-96; 8:45 am]
BILLING CODE 4910-13-P
