- Effective
- July 29, 1971
- Models
- BAC 1-11 200 Series, BAC 1-11 400 Series
- Data sheet
- TCDSA5EU
- Product
- Aircraft · Large airplane
- Amendment
- 39-1249
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 | 19 KB | e6390833…81c499d | FAA DRS (API key needed) |
On this page
The airworthiness directive
71-16-05 BRITISH AIRCRAFT CORPORATION: Amdt. 39-1249. Applies to Model BAC 1- 11 200 and 400 series airplanes.
To prevent a hazardous drift in the Voltage Sensing Unit, within the next 800 hours' time in service after the effective date of this AD, incorporate Rotax Modification SP 7174 by replacing the transistor T.1 in the Rotax Voltage Sensing Unit Type U.3619 or U.3619/1 with a new transistor, P/N.197235/1, in accordance with Rotax Service Bulletin No. 24-368 dated May 4, 1970, or later ARB-approved issue or an FAA-approved equivalent.
(British Aircraft Corporation Model BAC 1-11 Service Bulletin 24-PM 4641, Revision 2, dated June 15, 1970, refers to this subject.)
This amendment becomes effective July 29, 1971.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.