{"id":"F2005L02423","name":"AD/BAe 146/117 - Main Landing Gear Door Hinges","slug":"ad-bae-146-117-main-landing-gear-door-hinges","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":36963,"registerId":"commonwealth-F2005L02423-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"British Aerospace BAe 146 Series Aeropla","sectionType":"division","heading":"British Aerospace BAe 146 Series Aeroplanes","content":"### British Aerospace BAe 146 Series Aeroplanes\n\n| AD/BAe 146/117 | Main Landing Gear Door Hinges | 10/2005 |\n| -------------- | ----------------------------- | ------- |\n\n| Applicability: | All Models BAe 146 and AVRO RJ series aircraft that have not been modified in accordance with BAE Systems Operations Modification HCM01689A, Service Bulletin 52-113 Revision 1.                                                                                                                                                                                                                        |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Inspect the left and right main landing gear door hinge bracket assemblies in accordance with Paragraph 2C of BAE Systems Operations Service Bulletin (SB)52-113 Revision 1, or later EASA approved revision. Accomplish any necessary rectification before further flight in accordance with Paragraph 2D of SB 52-113 Revision 1, or later EASA approved revision.Note: UK CAA AD G-2005-0017 refers. |\n| Compliance:    | For aircraft manufactured before 1 March 1991, within 12 months after 29 September 2005, or before achieving 16 years from the date of construction, whichever occurs later.For aircraft manufactured after 28 February 1991, within 2 years after 29 September 2005.                                                                                                                                   |\n|                | This Airworthiness Directive becomes effective on 29 September 2005.                                                                                                                                                                                                                                                                                                                                    |\n| Background:    | The manufacturer has received a number of recent in-service reports of main landing gear door hinge bracket failures. Investigation revealed the cause as stress corrosion cracking of the bearing housing. Hinge failure could result in door separation with subsequent damage to undercarriage systems, and a threat to people on the ground.                                                        |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n8 August 2005","sortOrder":0},{"sectionNumber":"AD/BAe 146/117","sectionType":"part","heading":"AD/BAe 146/117","content":"## AD/BAe 146/117","sortOrder":1},{"sectionNumber":"Main Landing Gear Door Hinges","sectionType":"part","heading":"Main Landing Gear Door Hinges","content":"## Main Landing Gear Door Hinges","sortOrder":2},{"sectionNumber":"10/2005","sectionType":"part","heading":"10/2005","content":"## 10/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument, as presented, sets applicability to unmodified BAe 146/AVRO RJ aircraft and prescribes inspection and rectification per SB52‑113 Rev 1 with specified compliance times. The text gives no indication that the scope was altered from its original formulation."},"complexity_factors":["Applicability excludes aircraft modified under Operations Modification HCM01689A, so operators must confirm modification status (Applicability).","Mandates inspection and rectification in conformity with an external technical document (BAE SB52‑113 Rev 1) or later EASA‑approved revision, creating dependence on updated SB revisions and regulator approvals (Requirement).","Different compliance deadlines depending on manufacture date (pre‑1 Mar 1991: within 12 months or before 16 years from construction; post‑28 Feb 1991: within 2 years), requiring record checks and scheduling (Compliance).","Rectification must be accomplished before further flight, imposing potential immediate operational disruption if defects are found (Requirement).","Cross‑referencing to other authorities (UK CAA AD G‑2005‑0017 and EASA approvals) introduces multi‑jurisdictional interpretation and reliance on foreign ADs and approvals (Requirement / Background).","Safety risk (bearing housing stress corrosion cracking) is technical and may require parts and labour; cost and supply constraints affect operators (Background / Requirement)."],"plain_english_summary":"This Airworthiness Directive requires operators of BAe 146 and AVRO RJ aeroplanes that have not been modified under HCM01689A to inspect both main landing‑gear door hinge bracket assemblies and rectify any defects per BAE Systems Service Bulletin SB52‑113 Rev 1 (or later EASA‑approved revision) before further flight (Requirement). It applies only to unmodified aircraft (Applicability). Aircraft operators bear inspection and repair costs and must meet deadlines that vary by manufacture date (Compliance); CASA enforces the AD."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific safety-of-flight issue (hinge bracket failures). The scope remains tightly focused on the identified defect and affected aircraft population. No scope creep is evident."},"complexity_factors":["Single, specific technical requirement (inspect and rectify hinge brackets)","Only 2 defined compliance pathways based on manufacturing date","No nested exceptions or conditional logic beyond the applicability exclusion (aircraft already modified per HCM01689A)","Short document (approximately 250 words of substantive content)","Single cross-reference to UK CAA AD G-2005-0017 and manufacturer Service Bulletin","Clear, unambiguous deadlines with simple 'whichever occurs later' formulation for older aircraft"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of BAe 146 and AVRO RJ aircraft (unless modified per the referenced service bulletin) to inspect the left and right main landing gear door hinge brackets for stress corrosion cracking and repair any defects before flight. \n\nIt matters because hinge failure could let a gear door fall off and damage the undercarriage or endanger people on the ground. Compliance timing varies by build date; the AD took effect 29 September 2005."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-117-main-landing-gear-door-hinges","history":"/api/acts/ad-bae-146-117-main-landing-gear-door-hinges/history","analysis":"/api/acts/ad-bae-146-117-main-landing-gear-door-hinges/analysis","conflicts":"/api/acts/ad-bae-146-117-main-landing-gear-door-hinges/conflicts","importantCases":"/api/acts/ad-bae-146-117-main-landing-gear-door-hinges/important-cases","documents":"/api/acts/ad-bae-146-117-main-landing-gear-door-hinges/documents"}}