Airworthiness Directives; Boeing Model 747 Series Airplanes Equipped With Pratt & Whitney JT9D-3 and -7 Series Engines

[Federal Register Volume 63, Number 72 (Wednesday, April 15, 1998)]
[Rules and Regulations]
[Pages 18307-18308]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-9876]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 97-NM-267-AD; Amendment 39-10284; AD 98-02-02]
RIN 2120-AA64


Airworthiness Directives; Boeing Model 747 Series Airplanes 
Equipped With Pratt & Whitney JT9D-3 and -7 Series Engines

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule; correction.

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SUMMARY: This document corrects erroneous references that appeared in 
airworthiness directive (AD) 98-02-02 that was published in the Federal 
Register on January 16, 1998 (63 FR 2593). The erroneous references 
resulted in incorrect citations of AD numbers. That AD is applicable to 
certain Boeing Model 747 series airplanes. It supersedes an existing AD 
to continue to require repetitive inspections for discrepancies of the 
forward engine mount bulkhead of the nacelle strut, and corrective 
actions, if necessary. That AD also continues to provide for an 
optional terminating action for the repetitive inspections. For certain 
airplanes, the AD adds various inspections to detect discrepancies in 
the forward engine mount bulkhead and chord, and in the forward lower 
spar web, and corrective actions, if necessary. The AD also adds an 
additional optional terminating action for the repetitive inspections.

DATES: Effective February 2, 1998.
    The incorporation by reference of certain publications listed in 
the regulations was previously approved by the Director of the Federal 
Register as of February 2, 1998 (63 FR 2593, January 16, 1998).

FOR FURTHER INFORMATION CONTACT: Tamara L. Anderson, Aerospace 
Engineer, Airframe Branch, ANM-120S, FAA, Transport Airplane 
Directorate, Seattle Aircraft Certification Office, 1601 Lind Avenue, 
SW., Renton, Washington 98055-4056; telephone (425) 227-2771; fax (425) 
227-1181.

SUPPLEMENTARY INFORMATION: Airworthiness Directive (AD) 98-02-02, 
amendment 39-10284, applicable to certain Boeing Model 747 series 
airplanes, was published in the Federal

[[Page 18308]]

Register on January 16, 1998 (63 FR 2593). That AD supersedes AD 82-22-
02, amendment 39-4476 (47 FR 46842, October 21, 1982), to continue to 
require repetitive inspections for discrepancies of the forward engine 
mount bulkhead of the nacelle strut, and corrective action, if 
necessary. That AD also continues to provide for an optional 
terminating action for the repetitive inspections. For certain 
airplanes, that AD adds various repetitive inspections to detect 
discrepancies (i.e., cracks, damage, loose fasteners) in the forward 
engine mount bulkhead and in the forward lower spar web, and corrective 
actions, if necessary. For other airplanes, that AD adds a one-time 
inspection to detect stop drilled cracks of the exterior of the forward 
engine mount chord, and replacement of the chord with a new chord, if 
necessary. That AD also adds an additional optional terminating action 
for the repetitive inspections.
    As published, AD 98-02-02 contained two erroneous references to 
previously issued AD's, one in paragraph (a) of the AD and the other in 
paragraph (b). Paragraph (a) of that AD identified the affected 
airplanes as, ``For airplanes on which the terminating action specified 
in AD 80-03-09 * * *.'' However, the correct AD number should have been 
specified as 80-03-09 R1. Paragraph (b) of that AD identified the 
affected airplanes as, ``For airplanes on which only loose fasteners 
have been replaced as required by telegraphic AD T79-NW-21, amendment 
39-3687.'' Paragraph (b) is a restatement of a NOTE specified in AD 82-
22-02. The NOTE did not reference ``amendment 39-3687,'' therefore, 
paragraph (b) should not reference it either.
    Since no other part of the regulatory information has been changed, 
the final rule is not being republished.
    The effective of this AD remains February 2, 1998.


Sec. 39.13  [Corrected]

    On page 2595, in the first column, paragraph (a) of AD 98-02-02 is 
corrected to read as follows:
* * * * *
    (a) For airplanes on which the terminating action specified in AD 
80-03-09 R1, amendment 39-3832, has been accomplished: Within 300 hours 
time-in-service after October 27, 1982 (the effective date of 82-22-02, 
amendment 39-4476), accomplish paragraphs (a)(1), (a)(2), and (a)(3) of 
this AD. Repeat the inspections thereafter at intervals not to exceed 
4,000 flight hours, until accomplishment of the inspections required by 
paragraphs (c)(1) and (c)(2) of this AD or the terminating action 
specified in paragraph (e) of this AD.
* * * * *
    On page 2595, in the second column, paragraph (b) of AD 98-02-02 is 
corrected to read as follows:
* * * * *
    (b) For airplanes on which only loose fasteners have been replaced 
as required by telegraphic AD T79-NW-21: Within 600 hours time-in-
service after October 27, 1982, replace all fasteners in both rows of 
fasteners with new fasteners in accordance with one of the service 
bulletins listed below:
    <bullet> Boeing Alert Service Bulletin 747-54A2069, Revision 2, 
dated February 1, 1980;
    <bullet> Boeing Alert Service Bulletin 747-54A2069, Revision 3, 
dated May 23, 1980;
    <bullet> Boeing Alert Service Bulletin 747-54A2069, Revision 4, 
dated November 26, 1980;
    <bullet> Boeing Service Bulletin 747-54A2069, Revision 5, dated 
August 21, 1981;
    <bullet> Boeing Alert Service Bulletin 747-54A2069, Revision 6, 
dated October 22, 1982;
    <bullet> Boeing Service Bulletin 747-54A2069, Revision 7, dated 
July 28, 1988;
    <bullet> Boeing Service Bulletin 747-54A2069, Revision 8, dated 
June 9, 1994; or
    <bullet> Boeing Alert Service Bulletin 747-54A2069, Revision 9, 
dated May 29, 1997.
* * * * *
    Issued in Renton, Washington, on April 8, 1998.
Darrell M. Pederson,
Acting Manager,
Transport Airplane Directorate,
Aircraft Certification Service.
[FR Doc. 98-9876 Filed 4-14-98; 8:45 am]
BILLING CODE 4910-13-U

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