AD 74-10-04

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AD Number:
74-10-04
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
PRATT & WHITNEY Models JT9D-3A and JT9D-7 Engines
Subject:
Main Gearbox
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
05/14/1974
Make:
Pratt & Whitney Division
Model:
JT9D-3A | JT9D-7
Product Type:
Engine
Product Subtype:
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 74-10-04
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-1831

AD NUMBER:   74-10-04

SUBJECT HEADING:   PRATT & WHITNEY Models JT9D-3A and JT9D-7 Engines

ACTION:  

SUMMARY:  

DATES:   Effective May 14, 1974.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
74-10-04 PRATT & WHITNEY: Amendment 39-1831. Applies to all Pratt & Whitney Model JT9D-3A and JT9D-7 turbofan engines.

Compliance required not later than February 1, 1975.

1. To prevent the possibility of internal main gearbox fires in the event of an internal gearbox failure, rework the main gearbox in accordance with Pratt & Whitney Service Bulletin No. 4043, dated February 5, 1973, or later Federal Aviation Administration approved revisions.

2. To prevent leakage of oil around carbon face seals, replace present seal assemblies with the redesigned carbon face seal assemblies per Pratt & Whitney Service Bulletin No. 3902, dated August 8, 1972, or later Federal Aviation Administration approved revisions or Federal Aviation Administration approved equivalent.

3. Equivalent methods of compliance to the requirements of paragraph 2 above must be approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, New England Region.

The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to the Chief Engineer, Pratt and Whitney Aircraft, Division of United Aircraft Corporation, 400 Main Street, East Hartford, Connecticut 06108. These documents may also be examined at the Office of the Regional Counsel, New England Region, FAA, 12 New England Executive Park, Burlington, Massachusetts 01803 and at FAA Headquarters, 800 Independence Avenue, S. W., Washington, D. C. A historical file on this AD which includes the incorporated material in full is maintained by the FAA at its headquarters in Washington, D. C., and at the New England Regional Office in Burlington, Massachusetts.

This amendment becomes effective May 14, 1974.

FOOTER: