# AD 80-12-13: Engine Mount Beam

- 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: July 14, 1980
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-3799
- Registered aircraft: 26 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A20B33922D646189862569F20071F611.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/80-12-13

## The airworthiness directive

80-12-13 BRITISH AEROSPACE (formerly Hawker Siddeley, Ltd.): Amendment 39- 3799. Applies to Model DH/BH/HS 125 series airplanes, certificated in all categories, which have incorporated British Aerospace modification 251605 and have any of the following: an AiResearch APU Model GTCP30-92(c) installed as a replacement for AiResearch APU Model GTCP3-92, AiResearch Service Bulletin 30-49-3689 incorporated, or British Aerospace modification 257513, 252502, 256817, 256855, 258015, 258027, or 258037 incorporated.

NOTE: This AD is known to apply, but is not necessarily limited, to the airplanes listed below.

Model Series - all variants Serial Number DH/HS 125 1 25/097 DH/HS 125 3 25/113, 117, 125, 133,

140, 143, 144, 154, 157,

162, 164 thru 168, 172 HS/BH 125 400, 401, 403 25/178, 189, 194, 197,

209, 215, 217, 227, 231,

240, 242, 243, 246 thru 251,

254, 257, 270, 271, 272, 274 HS/BH 125 600 25/256 & 25/6012, 6015,

6017, 6019, 6021, 6024,

6027, 6029, 6030, 6031,

6033, 6035, 6037, 6039,

6041, 6042, 6045, 6048,

6049, 6050, 6052, 6053,

6054, 6056, 6057, 6058,

6059, 6060, 6062, thru 6071 HS 125 700 25/7001, 7007, 7010,

7013, 7020, 7022, 7025,

7028, 7031, NA 0201 0218

Compliance is required as indicated, unless already accomplished.

To prevent failure of the main engine mount beam, accomplish the following:

  (a) Within the next 500 hours time in service after the effective date of this AD, modify the main engine mount beam in accordance with Section 2, "Accomplishment Instructions", British Aerospace Service Bulletin 49-28(2675), Rev. 2, dated June 26, 1979, (hereinafter referred to as the Service Bulletin) or an FAA-approved equivalent.

  (b) For purposes of this AD, with the exception of cleats equivalent to those specified in the Service Bulletin, an FAA-approved equivalent may be approved by an FAA airworthiness or engineering and manufacturing inspector or the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Office. Any cleats equivalent to those specified in the Service Bulletin must be approved by the Chief, Aircraft Certification Staff, FAA Europe, Africa, and Middle East Office.

  (c) Upon request of an operator, the Chief, Aircraft Certification Staff, FAA, Europe, Africa and Middle East Office, c/o American Embassy, Brussels, Belgium, may adjust the compliance time specified in paragraph (a) of this AD or approve a modification equivalent to that specified in the Service Bulletin provided such request is made through an FAA maintenance inspector and the request contains substantiating data to justify the request for that operator.

This amendment becomes effective July 14, 1980.

## 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/80-12-13/models.md
Every aircraft: https://openairdocs.org/ad/80-12-13/aircraft.md

Its text cites no advisory circulars or STCs.

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