- Effective
- March 21, 1970
- Models
- Viscount 744, Viscount 745D
- Data sheet
- TCDSA-814
- Product
- Aircraft · Large airplane
- Amendment
- 39-942
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 20 KB | cfce61a1…3f87640 | FAA DRS (API key needed) |
On this page
The airworthiness directive
70-04-05 BRITISH AIRCRAFT CORPORATION: Amendment 39-942. Applies to BAC Viscount Model 744 and 745D airplanes.
Compliance is required within the next 450 hours' time in service after the effective date of this AD, unless already accomplished.
To assure that the automatic feathering system is armed properly during cruise, to protect against turbine overheat and to protect against separation of the propeller from the engine in the event of engine annulus gear failure, replace micro-switch actuating levers and set the "arm" setting of the automatic feathering system throttle micro-switches in accordance with British Aircraft Corporation, Viscount 700 series aircraft, Bulletin for Modification No. D.2207, 4th Issue, dated January 31, 1969, or later ARB-approved issue or an FAA-approved equivalent.
This amendment becomes effective March 21, 1970.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.