[Federal Register Volume 67, Number 4 (Monday, January 7, 2002)]
[Proposed Rules]
[Pages 697-699]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 02-303]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 98-ANE-48-AD]
RIN 2120-AA64


Airworthiness Directives; Pratt & Whitney JT8D Series Turbofan 
Engines

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: This document proposes the supersedure of an existing 
airworthiness directive (AD), applicable to Pratt & Whitney JT8D series 
turbofan engines, that currently requires revisions to the Time Limits 
Section (TLS) of the manufacturer's Engine Manuals (EMs) to include 
required enhanced inspection of selected critical life-limited parts at 
each piece-part exposure. This proposal would modify the airworthiness 
limitations section of the manufacturer's manual and an air carrier's 
approved continuous airworthiness maintenance program to incorporate 
additional inspection requirements. An FAA study of in-service events 
involving uncontained failures of critical rotating engine parts has 
indicated the need for mandatory inspections. The mandatory inspections 
are needed to identify those critical rotating parts with conditions, 
which if allowed to continue in service, could result in uncontained 
failures.

[[Page 698]]

The actions specified by this proposed AD are intended to prevent 
critical life-limited rotating engine part failure, which could result 
in an uncontained engine failure and damage to the airplane.

DATES: Comments must be received by March 8, 2002.

ADDRESSES: Submit comments to the Federal Aviation Administration 
(FAA), New England Region, Office of the Regional Counsel, Attention: 
Rules Docket No. 98-ANE-43-AD, 12 New England Executive Park, 
Burlington, MA 01803-5299. Comments may also be sent via the Internet 
using the following address: ``[email protected]''. Comments sent 
via the Internet must contain the docket number in the subject line. 
Comments may be inspected at this location by appointment between 8:00 
a.m. and 4:30 p.m., Monday through Friday, except Federal holidays.

FOR FURTHER INFORMATION CONTACT: Christopher Spinney, Aerospace 
Engineer, Engine Certification Office, FAA, Engine and Propeller 
Directorate, 12 New England Executive Park, Burlington, MA 01803-5299; 
telephone (781) 238-7175, fax (781) 238-7199.

SUPPLEMENTARY INFORMATION:

Comments Invited

    Interested persons are invited to participate in the making of the 
proposed rule by submitting such written data, views, or arguments as 
they may desire. Communications should identify the Rules Docket number 
and be submitted to the address specified above. All communications 
received on or before the closing date for comments, specified above, 
will be considered before taking action on the proposed rule. The 
proposals contained in this notice may be changed in light of the 
comments received.
    Comments are specifically invited on the overall regulatory, 
economic, environmental, and energy aspects of the proposed 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 summarizing each FAA-public contact concerned with 
the substance of this proposal will be filed in the Rules Docket.
    Commenters wishing the FAA to acknowledge receipt of their comments 
submitted in response to this action must submit a self-addressed, 
stamped postcard on which the following statement is made: ``Comments 
to Docket Number 98-ANE-43-AD.'' The postcard will be date stamped and 
returned to the commenter.

Availability of NPRMs

    Any person may obtain a copy of this NPRM by submitting a request 
to the FAA, New England Region, Office of the Regional Counsel, 
Attention: Rules Docket No. 98-ANE-43-AD, 12 New England Executive 
Park, Burlington, MA 01803-5299.

Discussion

    On October 16, 2000, the Federal Aviation Administration (FAA) 
issued airworthiness directive (AD) 2000-21-08, Amendment 39-11940 (65 
FR 65731, November 2, 2000), to require revisions to the Time Limits 
Section (TLS) of the Pratt & Whitney (PW) JT8D-200 Turbofan Engine 
Manual to include required enhanced inspection of selected critical 
life-limited parts at each piece-part exposure.

New Inspection Procedures

    Since the issuance of that AD, an FAA study of in-service events 
involving uncontained failures of critical rotating engine parts has 
indicated the need for additional mandatory inspections. The mandatory 
inspections are needed to identify those critical rotating parts with 
conditions, which if allowed to continue in service, could result in 
uncontained failures. This proposal would modify the time limitations 
section of the manufacturer's manual and an air carrier's approved 
continuous airworthiness maintenance program to incorporate additional 
inspection requirements.

Proposed Actions

    Since an unsafe condition has been identified that is likely to 
exist or develop on other products of this same type design, the 
proposed AD would supersede AD 2000-21-08 to add additional critical 
life-limited parts for enhanced inspection at each piece-part 
opportunity.

Economic Analysis

    The FAA estimates that 5821 engines installed on airplanes of US 
registry would be affected by this proposed AD, that it would take 
approximately 8 work hours per engine to perform the enhanced 
inspection for the first stage HP turbine disks. The average labor rate 
is $60 per work hour. The cost impact of the added inspections per 
engine is approximately $480 per year, with the approximate total cost 
for the US fleet of $2,794,080 per year.

Regulatory Impact

    The regulations proposed herein would 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 
proposal would not have sufficient federalism implications to warrant 
the preparation of a Federalism Assessment.
    For the reasons discussed above, I certify that this proposed 
regulation (1) is not a ``significant regulatory action'' under 
Executive Order 12866; (2) is not a ``significant rule'' under the DOT 
Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); 
and (3) if promulgated, 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 copy of the draft 
regulatory evaluation prepared for this action is contained in the 
Rules Docket. A copy of it may be obtained by contacting the Rules 
Docket at the location provided under the caption ADDRESSES.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration proposes to amend 
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 removing Amendment 39-11940 (65 FR 
65731, November 2, 2000 and by adding a new airworthiness directive, to 
read as follows:

Pratt & Whitney: Docket No. 98-ANE-48-AD. Supersedes AD 2000-21-08, 
Amendment 39-11940.

    Applicability: Pratt & Whitney (PW) JT8D-200 series turbofan 
engines, installed on but not limited to McDonnell Douglas MD80 
series airplanes.

    Note 1: 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

[[Page 699]]

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 request approval for an 
alternative method of compliance in accordance with paragraph (c) 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 already done.
    To prevent critical life-limited rotating engine part failure, 
which could result in an uncontained engine failure and damage to 
the airplane, accomplish the following:

Inspections

    (a) Within the next 30 days after the effective date of this AD, 
revise the Time Limits Section (TLS) of the JT8D/09200 Turbofan 
Engine Manual, and for air carrier operations revise the approved 
continuous airworthiness maintenance program, by adding the 
following: ``Critical Life Limited Part Inspection

A. Inspection Requirements

    (1) This section has the definitions for individual engine piece 
parts and the inspection procedures which are necessary when these 
parts are removed from the engine.
    (2) It is necessary to do the inspection procedures of the piece 
parts in paragraph B when:
    (a) The part is removed from the engine and disassembled to the 
level specified in paragraph B and
    (b) The part has accumulated more than 100 cycles since the last 
piece part inspection, provided that the part was not damaged or 
related to the cause for its removal from the engine.
    (3) The inspections specified in this paragraph do not replace 
or make not necessary other recommended inspections for these parts 
or other parts.

B. Parts Requiring Inspection

    Note: Piece part is defined as any of the listed parts with all 
the blades removed.


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                    Description                                Section                       Inspection
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Hub (Disk), 1st Stage Compressor:
    Hub Detail--All P/N's.........................  72-33-31.....................  -02, -03, -04
    Hub Assembly--All P/N's.......................  72-33-31.....................  -02, -03, -04
2nd Stage Compressor:
    Disk--All P/N's...............................  72-33-33.....................  -02
    Disk Assembly--All P/N's......................  72-33-33.....................  -02
Disk, 13th Stage Compressor:
    All P/N's.....................................  72-36-47.....................  -02
HP Turbine Disk, First Stage w/integral Shaft:
    All P/N's.....................................  72-52-04.....................  -03
HP Turbine, First Stage, w/Separable shaft:
    Rotor Assembly--All P/N's.....................  72-52-02.....................  -04
    Disk--All P/N's...............................  72-52-02.....................  -03
Disk, 2nd Stage Turbine:
    All P/N's.....................................  72-53-16.....................  -02
Disk, 3rd Stage Turbine:
    All P/N's.....................................  72-53-17.....................  -02
Disk (Separable), 4th Stage Turbine:
    All P/N's.....................................  72-53-15.....................  -02
Disk (Integral Disk/Hub), 4th Stage Turbine:
    All P/N's.....................................  72-53-18.....................  -02
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    (b) Except as provided in paragraph (c) of this AD, and 
notwithstanding contrary provisions in Sec. 43.16 of the Federal 
Aviation Regulations (14 CFR 43.16), these mandatory inspections 
must be performed using the TLS of the PW JT8D-200 Turbofan Engine 
Manual.

Alternative Methods of Compliance

    (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 Engine Certification Office (ECO). Operators 
shall submit their requests through an appropriate FAA Principal 
Maintenance Inspector (PMI), who may add comments and then send it 
to the ECO.

    Note 2: Information concerning the existence of approved 
alternative methods of compliance with this airworthiness directive, 
if any, may be obtained from the ECO.

Special Flight Permits

    (d) Special flight permits may be issued in accordance with Secs.  
21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 
and 21.199) to operate the airplane to a location where the 
requirements of this AD can be accomplished.

Continuous Airworthiness Maintenance Program

    (e) FAA-certificated air carriers that have an approved 
continuous airworthiness maintenance program in accordance with the 
record keeping requirement of Sec. 121.369(c) of the Federal 
Aviation Regulations (14 CFR 121.369(c)) of this chapter must 
maintain records of the mandatory inspections that result from 
revising the TLS of the PW JT8D/09200 Turbofan Engine Manual, and 
the air carrier's continuous airworthiness program. Alternatively, 
certificated air carriers may establish an approved system of record 
retention that provides a method for preservation and retrieval of 
the maintenance records that include the inspections resulting from 
this AD, and include the policy and procedures for implementing this 
alternate method in the air carrier's maintenance manual required by 
Sec. 121.369(c) of the Federal Aviation Regulations (14 CFR 
121.369(c)); however, the alternate system must be accepted by the 
appropriate PMI and require the maintenance records be maintained 
either indefinitely or until the work is repeated. Records of the 
piece-part inspections are not required under Sec. 121.380(a)(2)(vi) 
of the Federal Aviation Regulations (14 CFR 121.380(a)(2)(vi)). All 
other operators must maintain the records of mandatory inspections 
required by the applicable regulations governing their operations.

    Note 3: The requirements of this AD have been met when the 
engine manual changes are made and air carriers have modified their 
continuous airworthiness maintenance plans to reflect the 
requirements in the PW JT8D-200 Turbofan Engine Manual.


    Issued in Burlington, Massachusetts, on December 31, 2001.
Jay J. Pardee,
Manager, Engine and Propeller Directorate, Aircraft Certification 
Service.
[FR Doc. 02-303 Filed 1-4-02; 8:45 am]
BILLING CODE 4910-13-P