# AD 77-23-02: Propeller Feathering System

- Type: Airworthiness directive
- Status: Current
- Products: BAE Systems HS 748 Series 2A
- Effective: December 7, 1977
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-3072
- Registered aircraft: 2 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/69B9B57532EDB0BA862569A50070CB5C.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/77-23-02

## The airworthiness directive

77-23-02 HAWKER SIDDELEY AVIATION, LIMITED: Amendment 39-3072. Applies to Hawker Siddeley Aviation Limited H.S. 748 Series 2A airplanes certificated in all categories.

Compliance is required within the next 300 hours time in service after the effective date of this AD, unless already accomplished.

To prevent failure of propeller feathering, install an electrical back-up to the primary manual feathering system in accordance with the instructions contained in Hawker Siddeley Aviation Service Bulletin No. 61/18, Modification 4609, as revised April 11, 1974, or an equivalent approved by the Chief, Aircraft Certification Staff, AEU-100, Europe, Africa, and Middle East Region, FAA, c/o American Embassy, APO New York, N.Y. 09667.

This amendment becomes effective December 7, 1977.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A24EU](https://openairdocs.org/tcds/A24EU): BAE Systems (Operations) Limited; names 1 of 2 models: HS 748 Series 2A

## 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: 2 (2 by airframe model, 0 by engine model)
- Makers: British Aerospace 2

Models with the most aircraft:

- [British Aerospace HS-748-2A](https://openairdocs.org/model/british-aerospace-hs-748-2a): 2 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/77-23-02/models.md
Every aircraft: https://openairdocs.org/ad/77-23-02/aircraft.md

Its text cites no advisory circulars or STCs.

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