# AD 76-24-05: Turbine Disc

- Type: Airworthiness directive
- Status: Current
- Products: Rolls-Royce Limited, Bristol Engines Division Viper Mk. 601-22
- Effective: December 14, 1976
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-2781
- Registered aircraft: 4 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/569918BE47F859248625685F0051DEFC.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/76-24-05

## The airworthiness directive

76-24-05 ROLLS-ROYCE (1971) LIMITED: Amendment 39-2781. Applies to Rolls-Royce Bristol Viper Mk 601-22 engines installed, or being held for installation on Hawker Siddeley/Beechcraft Hawker Model DH/BH-125 series airplanes, certificated in all categories.

Compliance is required within the next 150 hours time in service after the effective date of this AD, unless already accomplished.

To prevent possible turbine disc damage, replace the inner exhaust turbine cone assembly in accordance with the "Accomplishment Instructions" of Rolls-Royce Alert Service Bulletin No. 72-A69, dated May 1976, or an equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region, APO New York, N.Y. 09667.

This amendment becomes effective December 14, 1976.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E15EU](https://openairdocs.org/tcds/E15EU) (historical): Rolls-Royce Deutschland Ltd & Co KG; names 1 of 1 models: Viper Mk. 601-22

## 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: 4 (0 by airframe model, 4 by engine model)
- Makers: Aero Vodochody 1, Aerovodochody 1, Bac Jet Provost 1, Soko 1

Models with the most aircraft:

- [Rolls-Royce VIPER MK60122](https://openairdocs.org/engine/rolls-royce-viper-mk60122): 3 aircraft (engine model)
- [Rolls-Royce VIPER MK 601 series](https://openairdocs.org/engine/rolls-royce-viper-mk-601-series): 1 aircraft (engine model)

All 2 models: https://openairdocs.org/ad/76-24-05/models.md
Every aircraft: https://openairdocs.org/ad/76-24-05/aircraft.md

Its text cites no advisory circulars or STCs.

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