# AD 82-12-03: Ampere Airfuse Installation

- Type: Airworthiness directive
- Status: Current
- Products: Textron BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A, DH.125 Series 1A-522, DH.125 Series 1A/R-522, DH.125 Series 1A/S-522, DH.125 Series 3A, DH.125 Series 3A/R, DH.125 Series 3A/RA, DH.125 Series 400A and HS.125 Series 600A
- Effective: June 8, 1982
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-4393
- Registered aircraft: 4 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8597A733468F2CE3862569F3004B8849.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/82-12-03

## The airworthiness directive

82-12-03 BRITISH AEROSPACE (Hawker Siddeley): Amendment 39-4393. Applies to all Model HS/BH/DH 125 aircraft up to and including Series 600A aircraft, certificated in all categories, S/Ns as listed in British Aerospace, Aircraft Group, 125 Series Aircraft Service Bulletin 49-23-(6525), Revision 5, dated August 18, 1981. Compliance is required as indicated unless already accomplished. To protect the PE busbar and ensure APU start circuit operation, accomplish the following:

1. Within the next 100 hours time in service after the effective date of this AD, install a 275 ampere airfuse in accordance with the applicable instructions in paragraph 2, "Accomplishment Instructions," of British Aerospace, Aircraft Group, 125 Series Aircraft Service Bulletin (SB) No. 49-23-(6525), Revision 5, dated August 18, 1981.

2. 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 modificationsrequired by this AD.

3. Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Chief, Seattle Area Aircraft Certification Office, FAA Northwest Mountain Region.

The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1).

This amendment becomes effective June 8, 1982.

## 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 11 of 50 models: HS.125 Series 600A, DH.125 Series 1A/R-522, BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 400A, DH.125 Series 3A/R, DH.125 Series 1A, DH.125 Series 1A-522…

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 4 (4 by airframe model, 0 by engine model)
- Makers: Hawker Siddeley 4

Models with the most aircraft:

- [Hawker Siddeley BH.125-400A](https://openairdocs.org/model/hawker-siddeley-bh-125-400a): 2 aircraft (airframe model)
- [Hawker Siddeley DH.125-3A/RA](https://openairdocs.org/model/hawker-siddeley-dh-125-3a-ra): 2 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/82-12-03/models.md
Every aircraft: https://openairdocs.org/ad/82-12-03/aircraft.md

Its text cites no advisory circulars or STCs.

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