# AD 70-05-01: Flap Signalling System

- Type: Airworthiness directive
- Status: Current
- Products: Airbus BAC 1-11 200 Series and BAC 1-11 400 Series
- Effective: March 23, 1970
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-945
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E441BE963E9776E4862569A400591D2B.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/70-05-01

## The airworthiness directive

70-05-01 BRITISH AIRCRAFT CORPORATION: Amdt. 39-945. Applies to Model BAC 1- 11 200 and 400 series airplanes.

To prevent false indication of a retracted flap position which could result in a failure of the flap structure in flight, within the next 1500 hours' time in service after the effective date of this AD, unless already accomplished, modify the flap signalling mechanism and flap control unit in accordance with British Aircraft Corporation Model BAC 1-11 Service Bulletin No. 27-PM 3550, Revision 2, dated February 3, 1969, or later ARB-approved issue or an FAA-approved equivalent.

(British Aircraft Corporation Model BAC 1-11 Alert Service Bulletin No. 27-A-PM 3550, dated August 18, 1968, covers the same subject.)

This amendment becomes effective March 23, 1970.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A5EU](https://openairdocs.org/tcds/A5EU): Airbus SAS; names 2 of 2 models: BAC 1-11 200 Series, BAC 1-11 400 Series

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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