# AD 91-07-12: Main Landing Gear Hinge Fittings - 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3A/R, DH.125 Series 3A/RA, DH.125 Series 400A, HS.125 Series 600A and HS.125 Series 700A - Effective: April 29, 1991 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-6950 - Docket: 90-NM-273-AD - Registered aircraft: 26 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DB3C75C8FBC8E55386256A0900693B1B.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/91-07-12 ## The airworthiness directive 91-07-12 BRITISH AEROSPACE: Amendment 39-6950. Docket No. 90-NM-273-AD. Applicability: All Model DH/BH/HS 125 series airplanes, post-modification 255640, certificated in any category. Compliance is required as indicated, unless previously accomplished. To ensure proper operation of the main landing gear (MLG) door, accomplish the following: A. Prior to the accumulation of 6,000 landings on the right and left MLG door aluminum forward hinge fittings, or within the next 400 landings after December 4, 1990 (the effective date of Amendment 39-6786, AD 90-23-01), whichever occurs later, and thereafter at intervals not to exceed 6,000 landings, replace the aluminum forward hinge fittings in accordance with British Aerospace Service Bulletin 32-218, dated July 28, 1988. B. Replacement of an aluminum hinge fitting with a new stainless steel hinge fitting, in accordance with British Aerospace Service Bulletin 32-220-3176A, B, and C, dated September 2, 1988, terminates the requirements for the replacement of the hinge fittings required by paragraph A. of this AD. 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. All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to British Aerospace, PLC, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041-0414. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington. Airworthiness Directive 91-07-12 supersedes AD 90-23-01, Amendment 39-6786. This amendment (39-6950, AD 91-07-12) becomes effective on April 29, 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 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/91-07-12/models.md Every aircraft: https://openairdocs.org/ad/91-07-12/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.