# AD 66-22-03: Aileron and Elevator System

- Type: Airworthiness directive
- Status: Current
- Products: Textron DH.125 Series 1A
- Effective: September 3, 1966
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-281
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F07EE79DFF634FA98625699F005F48D2.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/66-22-03

## The airworthiness directive

66-22-03 HAWKER SIDDELEY: Amdt. 39-281 Part 39 Federal Register September 3, 1966. Applies to Model DH.125-1A Airplanes Equipped With Aileron and Elevator Systems Gust Lock, P/N 25CF-1793AB.

Compliance required within the next 300 hours' time in service after the effective date of this AD, unless already accomplished.

To prevent operation with the elevator and aileron gust lock engaged, accomplish the following:

  (a) Remove gust lock assembly, P/N 25CF-1793AB, located on left side of cockpit.

  (b) Modify pilot's control wheel and seat rail, and install gust lock stowage box assembly, P/N 25.MM. 333, in accordance with Hawker Siddeley Aviation Ltd. Service Bulletin No. 27-34-(1716), dated May 18, 1966, or later ARB-approved issue.

  (c) Equip airplane with aileron and elevator gust lock assembly P/N 25.MM. 2583. This directive effective September 3, 1966.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A3EU](https://openairdocs.org/tcds/A3EU): Textron Aviation Inc.; names 1 of 50 models: DH.125 Series 1A

## 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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