# AD 87-04-14: Starter/Generator

- Type: Airworthiness directive
- Status: Current
- Products: 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, DH.125 Series 3A, DH.125 Series 3A/R, DH.125 Series 3A/RA, DH.125 Series 400A, HS.125 Series 600A and HS.125 Series 700A
- Effective: March 9, 1987
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-5540
- Registered aircraft: 26 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7759E6CA805F6609862569F3004D5CEF.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/87-04-14

## The airworthiness directive

87-04-14 BRITISH AEROSPACE: Amendment 39-5540. Applies to British Aerospace (BAe) Model DH/HS/BH-125 series airplanes identified in BAe Service Bulletins 49-31-9286A and 49-32-9210A, both Revision 1, and both dated March 24, 1986, certificated in any category. Compliance is required within 6 months after the effective date of this AD. To reduce the possibility of APU fuel leakage in the rear equipment bay, and assure electrical bonding of the starter/generator to the airplane, accomplish the following, unless previously accomplished:

A. Seal the APU plenum shroud at the turbine plenum drain outlet in accordance with BAe Service Bulletin 49-31-9286A, Revision 1, dated March 24, 1986, Modification No. 259286A.

B. Install twin heavy duty bonding cables between the APU accessory case and ground terminal post 16 on the main engine beam in accordance with BAe Service Bulletin 49-32- 9210A, Revision 1, dated March 24, 1986, Modification No. 259210A.

C. An alternate meansof compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Northwest Mountain Region.

D. 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 the modifications required by this AD.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to British Aerospace, Inc., Librarian, Box 17414, Dulles International Airport, Washington, D.C. 20041. These documents may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

This amendment becomes effective March 9, 1987.

## 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 12 of 50 models: HS.125 Series 600A, HS.125 Series 700A, 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…

## 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: 26 (26 by airframe model, 0 by engine model)
- Makers: British Aerospace 14, Hawker Siddeley 11, Raytheon 1

Models with the most aircraft:

- [British Aerospace HS 125-700A](https://openairdocs.org/model/british-aerospace-hs-125-700a): 14 aircraft (airframe model)
- [Hawker Siddeley HS.125 SERIES 700A](https://openairdocs.org/model/hawker-siddeley-hs-125-series-700a): 7 aircraft (airframe model)
- [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)
- [Raytheon HS 125-700A](https://openairdocs.org/model/raytheon-hs-125-700a): 1 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/87-04-14/models.md
Every aircraft: https://openairdocs.org/ad/87-04-14/aircraft.md

Its text cites no advisory circulars or STCs.

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