# AD 79-25-03: Second, Third, And Fourth Stage Turbine Wheels

- Type: Airworthiness directive
- Status: Current
- Products: Rolls-Royce 501-D13, 501-D13A, 501-D13D, 501-D13E and 501-D13H
- Effective: December 13, 1979
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-3625
- Registered aircraft: 9 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7603E10114C52EB2862568540073C2B3.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/79-25-03

## The airworthiness directive

79-25-03 DETROIT DIESEL ALLISON: Amendment 39-3625. Applies to Model 501-D13, 501-D13A, 501-D13D, 501-D13E, and 501-D13H engines equipped with second, third, and fourth stage turbine wheels P/N's 6829072, 6847112, 6788833, 6842143, 6841223, 6846553, 6738424, and 6843014.

Compliance required as follows unless previously accomplished:

  (a) For second stage turbine wheels, remove from service in accordance with FAA approved revision of 501-D13 CSL-235 dated December 13, 1979.

  (b) For third and fourth stage turbine wheels, remove from service in accordance with FAA approved revision of 501-D13 CSL-253 dated December 13, 1979.

Detroit Diesel Allison Commercial Service Letters 501-D13 CSL-235, 501-D13 CSL-253, and Commercial Overhaul Information Letter 501-D13 COIL-349 revised as of December 13, 1979 are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). The incorporated service documents may be obtained from Detroit Diesel Allison, Division ofGeneral Motors Corporation, Indianapolis, Indiana 46206.

This amendment becomes effective on December 13, 1979.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E-282](https://openairdocs.org/tcds/E-282): Rolls-Royce Corporation; names 5 of 9 models: 501-D13, 501-D13E, 501-D13A, 501-D13H, 501-D13D

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 9 (0 by airframe model, 9 by engine model)
- Makers: Convair 6, Lockheed 3

Models with the most aircraft:

- [Allison 501-D13 series](https://openairdocs.org/engine/allison-501-d13-series): 9 aircraft (engine model)

All 1 models: https://openairdocs.org/ad/79-25-03/models.md
Every aircraft: https://openairdocs.org/ad/79-25-03/aircraft.md

Its text cites no advisory circulars or STCs.

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