# AD 91-19-05: Fire Extinguisher System Wiring - Type: Airworthiness directive - Status: Current - Products: Textron BAe.125 Series 800A, 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Series 3A/R, DH.125 Series 3A/RA, DH.125 Series 400A, HS.125 Series 1B and 25 more - Effective: September 26, 1991 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-8032 - Docket: 91-NM-179-AD - Registered aircraft: 110 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7C28F1E13EE9037986256A09005E275A.0001 - DRS record last changed: January 21, 2026 - Page: https://openairdocs.org/ad/91-19-05 ## The airworthiness directive 91-19-05 BRITISH AEROSPACE: Amendment 39-8032. Docket No. 91-NM-179-AD. Applicability: Model BAe 125-800A, Model HS.125-700A, and Model DH/BH/HS 125 series airplanes retrofitted with Garrett engines which are pre-mod 253274A; certificated in any category. Compliance: Required as indicated, unless previously accomplished. To prevent the loss of fire extinguishment capability, accomplish the following: (a) Within 30 days after the effective date of this AD, perform a visual inspection of the engine fire extinguisher system wiring to detect crossed wiring, improperly identified or unidentified wiring and wiring supports, missing wiring supports, and loose or improperly locked electrical connectors, in accordance with British Aerospace Service Bulletin 26-31, dated February 25, 1991. (b) If any discrepancy is found during the inspection required by paragraph (a) of this AD, prior to further flight, correct it in accordance with the instructions in British Aerospace Service Bulletin 26-31, dated February 25, 1991. (c) An alternative method of 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, Transport Airplane Directorate. NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Standardization Branch, ANM-113. (d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. (e) The inspection and correction requirements shall be done in accordance with British Aerospace Service Bulletin 26-31, dated February 25, 1991. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from British Aerospace, PLC, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041-0414. Copies may be inspected at the FAA, Transport Airplane Directorate, Renton, Washington; or at the Office of the Federal Register, 1100 L Street N.W., Room 8401, Washington, D.C. This amendment (39-8032, AD 91-19-05) becomes effective on September 26, 1991. ## 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 37 of 50 models: HS.125 Series 3B/RB, HS.125 Series 401B, HS.125 Series 600A, HS.125 Series 600B/2, HS.125 Series 403A(C), HS.125 Series 600B/1, HS.125 Series 700A, DH.125 Series 1A/R-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: 110 (110 by airframe model, 0 by engine model) - Makers: British Aerospace 80, Hawker Siddeley 11, Corporate Jets 8, Raytheon Corporate Jets 8, Raytheon 3 Models with the most aircraft: - [British Aerospace BAE 125 SERIES 800A](https://openairdocs.org/model/british-aerospace-bae-125-series-800a): 61 aircraft (airframe model) - [British Aerospace HS 125-700A](https://openairdocs.org/model/british-aerospace-hs-125-700a): 14 aircraft (airframe model) - [Corporate Jets BAE 125-800A](https://openairdocs.org/model/corporate-jets-bae-125-800a): 8 aircraft (airframe model) - [Raytheon Corporate Jets BAE 125-800A](https://openairdocs.org/model/raytheon-corporate-jets-bae-125-800a): 8 aircraft (airframe model) - [Hawker Siddeley HS.125 SERIES 700A](https://openairdocs.org/model/hawker-siddeley-hs-125-series-700a): 7 aircraft (airframe model) - [British Aerospace BAE 125-800A](https://openairdocs.org/model/british-aerospace-bae-125-800a): 5 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 BAE 125-800A](https://openairdocs.org/model/raytheon-bae-125-800a): 2 aircraft (airframe model) - [Raytheon HS 125-700A](https://openairdocs.org/model/raytheon-hs-125-700a): 1 aircraft (airframe model) All 11 models: https://openairdocs.org/ad/91-19-05/models.md Every aircraft: https://openairdocs.org/ad/91-19-05/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.