# AD 75-27-02: Propeller Feathering

- Type: Airworthiness directive
- Status: Current
- Products: Vickers-Armstrongs Viscount 744, Viscount 745D and Viscount 810
- Effective: January 19, 1976
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-2474
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/893D37F5102E7515862569A4006F9D78.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-27-02

## The airworthiness directive

75-27-02 BRITISH AIRCRAFT CORPORATION: Amendment 39-2474. Applies to British Aircraft Corporation (BAC) Viscount Models 744, 745D and 810 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 BAC Bulletin-For- Modification No. FG.2122, dated February 11, 1972, (for Viscount Model 810 airplanes), or BAC Bulletin-For-Modification No. D.3245, dated February 11, 1972 (for Viscount Models 744 and 745D airplanes), as appropriate, or an equivalent of either approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region, FAA-American Embassy, APO New York 09667.

This amendment becomes effective on January 19, 1976.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-814](https://openairdocs.org/tcds/A-814): Vickers-Armstrongs (Aircraft Limited); names 3 of 3 models: Viscount 810, Viscount 744, Viscount 745D

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.