# AD 81-19-08: Low Pressure Turbine Rotor Stage 2 Disks

- Type: Airworthiness directive
- Status: Current
- Products: General Electric CF6-6D, CF6-6D1, CF6-6D1A, CF6-6K and CF6-6K2
- Effective: September 21, 1981
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-4219
- Registered aircraft: 11 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AFE41D0F8B6F0F928625685F006D1E36.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/81-19-08

## The airworthiness directive

81-19-08 GENERAL ELECTRIC: Amendment 39-4219. Applies to all General Electric Model CF6-6 series turbofan engines installed in McDonnell Douglas DC10-10 aircraft containing low pressure turbine rotor stage 2 disks, P/Ns 9690M77P03, 9690M77P04, 9690M77P09, 9690M77P11, and 9690M77P13.

Compliance required as indicated.

To prevent possible low cycle fatigue failure of these disks, the life limits have been reduced below the figures currently approved. Remove from service low pressure turbine rotor stage 2 disks prior to reaching the revised life limits listed below or within the next 25 cycles in service after the effective date of this AD, whichever comes later.

Disk Part Number Previous Life Limit/Cycles Revised Life Limit/Cycles 9690M77P03 27,000 11,500 9690M77P04 27,000 11,500 9690M77P09 27,000 11,500 9690M77P11 27,000 11,500 Serial Numbers MP0A0727 through MP0A2215

9690M77P11 27,000 9,300 All other serial numbered disks9690M77P13 27,000 10,000

NOTE: General Electric CF6-6 Service Bulletin 72-786 pertains to this subject.

This amendment becomes effective on September 21, 1981.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E23EA](https://openairdocs.org/tcds/E23EA): General Electric Company; names 5 of 18 models: CF6-6D1A, CF6-6D, CF6-6D1, CF6-6K, CF6-6K2

## 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: 11 (0 by airframe model, 11 by engine model)
- Makers: Boeing 6, Mcdonnell Douglas 3, Airbus Industrie 2

Models with the most aircraft:

- [GE CF6-6 series](https://openairdocs.org/engine/ge-cf6-6-series): 9 aircraft (engine model)
- [GE CF6-6D](https://openairdocs.org/engine/ge-cf6-6d): 2 aircraft (engine model)

All 2 models: https://openairdocs.org/ad/81-19-08/models.md
Every aircraft: https://openairdocs.org/ad/81-19-08/aircraft.md

Its text cites no advisory circulars or STCs.

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