# AD 75-26-11: Antenna Cable

- Type: Airworthiness directive
- Status: Current
- Products: Airbus BAC 1-11 200 Series and BAC 1-11 400 Series
- Effective: January 14, 1976
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-2467
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BD94AF28B36FE714862569A4006F040B.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-26-11

## The airworthiness directive

75-26-11 BRITISH AIRCRAFT CORPORATION: Amendment 39-2467. Applies to BAC 1- 11 200 and 400 series airplanes certificated in all categories, equipped with H.F. radio systems that do not have BAC Modifications PM 4412 Part (a) or Part (b) and Modification PM 4424 incorporated.

Compliance is required as indicated:

To prevent hazardous arcing at the H.F. antenna tuning unit connector post in the vicinity of the oxygen system, accomplish the following:

  (a) Within the next 25 hours' time in service, after the effective date of this AD, comply with the following:

  (1) Unless accomplished within the last 25 hours' time in service, inspect the H.F. antenna lead-in cable at the antenna, the antenna tuning unit (A.T.U.) connectors, the tuning unit and all adjacent wiring and oxygen piping in the immediate vicinity for signs of overheating damage or arcing, and replace damaged parts with parts of the same part numbers, or FAA- approved equivalent parts.

  (2) Remove and discard the rubber overshoe fitted at the A.T.U. connector post.

  (3) Attach a placard on the instrument panel in full view of the pilot reading:

"The passenger oxygen system control valve must remain in the OFF position. Conduct operations in accordance with FAR 121.329 or 91.32, as applicable."

  (b) Repeat the inspection required by paragraph (a)(1) of this AD at intervals not to exceed 50 hours' time in service from the last inspection until paragraph (c) of this AD is complied with, at which time the inspection interval may be increased not to exceed 200 hours' time in service from the last inspection.

  (c) The placard required by paragraph (a)(3) of this AD may be removed and the inspection interval prescribed in paragraph (b) may be established upon completion of the following:

  (1) Compliance with the provisions of British Aircraft Corporation Alert Service Bulletin 23-A-PM 4346 dated April 5, 1971, paragraph numbers 3.1, 3.2, 3.3, 3.4, 3.5, 3.7, 3.8, 3.9, 4.3, 4.4, 4.5, or FAA-approved equivalents.

  (2) Alteration of the oxygen system in accordance with BAC Modification PM 4412 Part (a) and Part (b), or an FAA-approved equivalent.

This amendment becomes effective on January 14, 1976.

## 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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