# AD 91-23-13: Fan Disks

- Type: Airworthiness directive
- Status: Current
- Products: General Electric CF6-50A, CF6-50C, CF6-50C1, CF6-50C2, CF6-50C2B, CF6-50C2D, CF6-50CA, CF6-50E, CF6-50E1, CF6-50E2, CF6-50E2B, CF6-80A and 3 more
- Effective: November 22, 1991
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-8082
- Docket: 91-ANE-38
- Registered aircraft: 271 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/210A13B300311A1F8625686C004A0C4E.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/91-23-13

## The airworthiness directive

91-23-13 GENERAL ELECTRIC COMPANY: Amendment No. 39-8082. Docket No. 91- ANE-38. Applicability: General Electric Company (GE) CF6-50 series and CF6-80A series turbofan engines, installed on, but not limited to, Airbus A300 and A310, Boeing 747 and 767, and McDonnell Douglas DC10-15 and DC10-30 aircraft. Compliance: Required as indicated, unless previously accomplished. To prevent an uncontained engine failure and damage to the aircraft, accomplish the following: (a) Within 30 days after the effective date of this AD, remove from service stage 1 fan disks identified by the following part number (P/N) and serial number (S/N):

ENGINE MODEL PART NUMBER SERIAL NUMBER CF6-50 9253M66P02 MPON2919

9253M66P02 MPON2920

9253M66P02 MPON2921

9253M66P02 MPON2922 CF6-80A 9319M28P03 MPON4290

1327M57P02 MPON4291

9319M28P02 MPON4292

9319M28P03 MPON7740

9319M28P03 MPON7742

9319M28P03 MPON8452

9319M28P03 MPON8453

Prior to returning affected engines to service replace with a serviceable part. (b) Aircraft may be ferried in accordance with the provisions of FAR 21.197 and 21.199 to a base where the AD can be accomplished. (c) Upon submission of substantiating data by an owner or operator through an FAA Inspector (maintenance, avionics, or operations, as appropriate), an alternate method of compliance with the requirements of this AD or adjustments to the compliance times specified in this AD may be approved by the Manager, Engine Certification Office, Engine and Propeller Directorate, Aircraft Certification Service, 12 New England Executive Park, Burlington, Massachusetts 01803-5299. This amendment (39-8082, AD 91-23-13) becomes effective on November 22, 1991.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E23EA](https://openairdocs.org/tcds/E23EA): General Electric Company; names 11 of 18 models: CF6-50E1, CF6-50CA, CF6-50A, CF6-50E, CF6-50C2D, CF6-50C1, CF6-50E2B, CF6-50C2…
- [TCDS E13NE](https://openairdocs.org/tcds/E13NE): General Electric Company GE Aerospace; names 4 of 28 models: CF6-80A2, CF6-80A1, CF6-80A, CF6-80A3

## 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: 271 (0 by airframe model, 271 by engine model)
- Makers: Boeing 171, Mcdonnell Douglas 62, Airbus Industrie 35, Mcdonnell-Douglas 2, Bombardier 1

Models with the most aircraft:

- [GE CF6-80 series](https://openairdocs.org/engine/ge-cf6-80-series): 237 aircraft (engine model)
- [GE CF6-50C2](https://openairdocs.org/engine/ge-cf6-50c2): 10 aircraft (engine model)
- [GE CF6-50 series](https://openairdocs.org/engine/ge-cf6-50-series): 9 aircraft (engine model)
- [GE CF6-80A](https://openairdocs.org/engine/ge-cf6-80a): 9 aircraft (engine model)
- [GE CF6-80A2](https://openairdocs.org/engine/ge-cf6-80a2): 5 aircraft (engine model)
- [GE CF6-50C](https://openairdocs.org/engine/ge-cf6-50c): 1 aircraft (engine model)

All 6 models: https://openairdocs.org/ad/91-23-13/models.md
Every aircraft: https://openairdocs.org/ad/91-23-13/aircraft.md

Its text cites no advisory circulars or STCs.

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