# AD 93-24-08: Engine Fire Extinguisher Systems - Type: Airworthiness directive - Status: Current - Products: Textron BAe.125 Series 1000B, BAe.125 Series 800A, BAe.125 Series 800A (C-29A), BAe.125 Series 800A (U-125), BAe.125 Series 800B, 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1A-522, DH.125 Series 1A/R-522, DH.125 Series 1A/S-522, DH.125 Series 3A and 29 more - Effective: January 18, 1994 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-8757 - Docket: 93-NM-52-AD - Registered aircraft: 111 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/12F525F0651FD8A086256A09005E4483.0001 - DRS record last changed: January 21, 2026 - Page: https://openairdocs.org/ad/93-24-08 ## The airworthiness directive 93-24-08 CORPORATE JETS LIMITED (FORMERLY DE HAVILLAND, HAWKER SIDDELEY, BEECHCRAFT HAWKER, AND BRITISH AEROSPACE): Amendment 39-8757. Docket 93-NM-52-AD. Applicability: Model DH/HS/BH/BAe 125 series airplanes, excluding Model BAe 125-1000A series airplanes; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent failure of the engine fire extinguisher systems, accomplish the following: (a) Within 90 days after the effective date of this AD, conduct a one-time functional test of the diodes located in each engine fire extinguisher system to verify proper operation of the diodes, in accordance with Corporate Jets, Limited, Service Bulletin S.B. 26-33, dated December 8, 1992. (b) If any diode is found to be defective, prior to further flight, replace the defective diode in accordance with Corporate Jets Limited Service Bulletin S.B. 26-33, dated December 8, 1992. (c) Within 10 days after accomplishingthe functional test required by paragraph (a) of this AD, report all test findings, positive or negative, by mail or fax message to the following address: Service Support Manager, Corporate Jets Limited, 3 Bishop Square, St. Albans Road West, Hatfield, Hertfordshire AL10 9NE, England; fax 011-44-707 253959, or 011-44-707 252367. Information collection requirements contained in this regulation have been approved by the Office of Management and Budget (OMB) under the provisions of the Paperwork Reduction Act of 1980 (44 U.S.C. 3501 et seq.) and have been assigned OMB Control Number 2120-0056. (d) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Standardization Branch, ANM-113. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113. (e) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (f) The functional test and replacement shall be done in accordance with Corporate Jets Limited Service Bulletin S.B. 26-33, dated December 8, 1992. 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 Corporate Jets, Inc., 22070 Broderick Drive, Sterling, Virginia 20166. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (g) This amendment becomes effective on January 18, 1994. ## 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 39 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: 111 (111 by airframe model, 0 by engine model) - Makers: British Aerospace 80, Hawker Siddeley 11, Corporate Jets 8, Raytheon Corporate Jets 8, Raytheon 3, Hawker Beechcraft 1 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) - [Hawker Beechcraft BAE 125-800B](https://openairdocs.org/model/hawker-beechcraft-bae-125-800b): 1 aircraft (airframe model) - [Raytheon HS 125-700A](https://openairdocs.org/model/raytheon-hs-125-700a): 1 aircraft (airframe model) All 12 models: https://openairdocs.org/ad/93-24-08/models.md Every aircraft: https://openairdocs.org/ad/93-24-08/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.