AD 76-12-03

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AD Number:
76-12-03
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
PRATT & WHITNEY Model JT9D Engines
Subject:
Sixth Stage Turbine Disk
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
06/22/1976
Make:
Pratt & Whitney Division
Model:
JT9D-20 | JT9D-20J | JT9D-3A | JT9D-59A | JT9D-7 | JT9D-70A | JT9D-7A | JT9D-7AH | JT9D-7F | JT9D-7H...Show more
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Superseded AD: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Superseded By: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: 76-12-03
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-2634

AD NUMBER:   76-12-03

SUBJECT HEADING:   PRATT & WHITNEY Model JT9D Engines

ACTION:  

SUMMARY:  

DATES:   Effective June 22, 1976.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
76-12-03 PRATT & WHITNEY: Amendment 39-2634. Applies to all Pratt and Whitney JT9D Turbofan Engines containing turbine exhaust cases, part numbers 701877, 728301 thru 728309, 731370 thru 731373, 731377, 731565, 738438, 739431, 746128, 746272 thru 746274, 749510, 752872 thru 752876, 754763, 756838 and 761943.

Compliance required once each day the engine is operated.

In order to preclude failure of the sixth stage turbine disk resulting from an oil fire in the No. 4 bearing area, visually inspect the engine tailpipe/exhaust case area, to determine if there is oil leakage from the No. 4 bearing area.

If oil leakage is found in the No. 4 bearing compartment area, either of the following corrective actions must be taken prior to further flight:

1. Inspect the No. 4 bearing oil pressure and scavenge tubes. Replace cracked or blocked tubes with new or serviceable parts.

2. Drill a drain hole in the turbine exhaust case inner flow path wall in accordance with Pratt and Whitney Alert Service Bulletin 4552 dated March 29, 1976, or later FAA approved revision.

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 Pratt and Whitney Aircraft, Division of United Technologies Corporation, 400 Main Street, East Hartford, Connecticut 06108. These documents may also be examined at Federal Aviation Administration, New England Region, 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 New England Region.

This amendment becomes effective June 22, 1976.

FOOTER: