- Effective
- October 14, 1984
- Models
- BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A, DH.125 Series 1A/R-522, DH.125 Series 1A/S-522, DH.125 Series 1A-522 and 6 more
- Data sheet
- TCDSA3EU
- Registered aircraft
- 26 matched by model
- Product
- Aircraft · Large airplane
- Amendment
- 39-4910
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.
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On this page
The airworthiness directive
84-20-05 BRITISH AEROSPACE: Amendment 39-4910. Applies to Model DH/HS/BH 125 airplanes, series and serial numbers listed in the Planning Information section of the service bulletins referenced below, certificated in all categories. Compliance is required as indicated, unless previously accomplished.
To prevent landing gear and brake failure, within the next 90 days after the effective date of this AD, accomplish the following:
A. Incorporate British Aerospace modification No. 251714 to the landing gear emergency selector shaft assembly in accordance with the instructions of British Aerospace HS 125 Service Bulletin 32-59-(1714), Revision 3, dated June 23, 1983.
B. Replace the knife edges of the brake control valves that have been overhauled by Dunlop Aviation Incorporated (California), with new parts in accordance with the instructions of British Aerospace HS 125 Service Bulletin 32-193, Revision 1, dated July 26, 1983.
C. Inspect the main landing gear jacks forcracks, and replace the jacks if necessary, in accordance with the instructions of British Aerospace HS 125 Service Bulletin 32-A197, dated August 29, 1983.
D. Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region.
E. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD.
This amendment becomes effective October 14, 1984.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 26
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1968 | 1 |
|---|---|
| 1970 | 1 |
| 1971 | 1 |
| 1977 | 1 |
| 1978 | 1 |
| 1980 | 2 |
| 1981 | 1 |
| 1982 | 5 |
| 1984 | 1 |
12 with no year recorded