{"id":"F2005L00225","name":"AD/BAe 146/113 - Nose Landing Gear Retirement Life","slug":"ad-bae-146-113-nose-landing-gear-retirement-life","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":33771,"registerId":"commonwealth-F2005L00225-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 146/113 | Nose Landing Gear Retirement Life | 3/2005 |\n| -------------- | --------------------------------- | ------ |\n\n| Applicability: | All Model BAe 146 Series 100 and 200 aircraft.                                                                                                                                                                                                                                                                                                                                                                                |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Confirm the part number of the nose landing gear (NLG) main fitting in accordance with BAE Systems (Operations) Service Bulletin (SB) ISB 32-169, or later EASA approved revision.2. For nose landing gear fitting sub assemblies listed in SB ISB 32-169, or later EASA approved revision, replace the NLG with a unit modified in accordance with Paragraph D of SB ISB 32-169.Note: UK CAA AD G-2005-0001 refers.       |\n| Compliance:    | 1. Within 30 days after 17 March 2005.2. Remove the NLG from service before exceeding either of the following thresholds:a. 8,000 landings since last overhaul; or,b. 35,000 landings since new; or,c. Within the next 500 landings after 17 March 2005 if this occurs later than either a. or b. above.                                                                                                                      |\n|                | This Airworthiness Directive becomes effective on 17 March 2005.                                                                                                                                                                                                                                                                                                                                                              |\n| Background:    | The BAe 146 Aircraft Maintenance Manual Chapter 5, at Revision 80, contains incorrect safe life information for nose landing gear Assemblies Part/Type Numbers 200876001 and 200876003. Operation beyond the approved safe life limit may result in development of fatigue cracks in the main fitting of the nose landing gear, which could lead to sudden failure of the fitting and a hazardous nose landing gear collapse. |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n4 February 2005","sortOrder":0},{"sectionNumber":"AD/BAe 146/113","sectionType":"part","heading":"AD/BAe 146/113","content":"## AD/BAe 146/113","sortOrder":1},{"sectionNumber":"Nose Landing Gear Retirement Life","sectionType":"part","heading":"Nose Landing Gear Retirement Life","content":"## Nose Landing Gear Retirement Life","sortOrder":2},{"sectionNumber":"3/2005","sectionType":"part","heading":"3/2005","content":"## 3/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD stays within the original safety‑focused purpose: correcting and enforcing the safe‑life retirement of specified nose landing gear fittings because the maintenance manual contained incorrect life limits. It does not broaden the subject beyond retirement/modification and part‑number confirmation for the specified fittings; it does not introduce unrelated regulatory obligations."},"complexity_factors":["Narrow applicability: only BAe 146 Series 100 and 200 aircraft","Cross-reference to an external technical document: BAE Systems SB ISB 32-169 and any later EASA‑approved revision","Three alternative retirement thresholds with a tie‑breaker (8,000 landings since overhaul; 35,000 since new; or within next 500 landings after 17 March 2005)","Short initial compliance window for part‑number confirmation (30 days)","Requirement to replace certain sub‑assemblies only if listed in the Service Bulletin (conditional replacement)","Reference to another regulator's AD (UK CAA AD G-2005-0001) for background"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- Applies to: all British Aerospace BAe 146 Series 100 and 200 aeroplanes (Applicability).\n- Requires two immediate actions (Requirement):\n  - Check and record the part number of the nose landing gear (NLG) main fitting using BAE Systems Service Bulletin ISB 32-169 (or a later EASA‑approved revision).\n  - If the NLG is one of the sub‑assemblies listed in that Service Bulletin, replace it with a unit modified in accordance with Paragraph D of SB ISB 32-169 (or later EASA‑approved revision).\n- Sets mandatory retirement limits for affected NLG fittings (Compliance): remove the NLG from service before it exceeds either:\n  - 8,000 landings since its last overhaul; or\n  - 35,000 landings since new; or\n  - if neither of the above already applies, within the next 500 landings after 17 March 2005 (whichever threshold is reached first for a given fitting).\n- Timing: the part‑number confirmation must be done within 30 days after 17 March 2005; the removal/retirement must occur before the relevant threshold is exceeded. The AD became effective on 17 March 2005.\n\n**Why this requirement was imposed (stated reason)**\n\n- The BAe 146 Maintenance Manual (Chapter 5, Revision 80) contained incorrect safe‑life information for NLG assemblies P/Ns 200876001 and 200876003. The stated risk is that operating beyond the correct safe life could allow fatigue cracks to form in the main fitting, possibly causing sudden failure and nose‑gear collapse (Background).\n\n**Who is affected and who pays**\n\n- Aircraft operators/owners of BAe 146 Series 100 and 200 aircraft must comply. They are responsible for: locating maintenance records, confirming part numbers, scheduling inspections or replacements, and bearing the direct costs of modifications, replacement parts and aircraft downtime.\n\n**What must change in operator behaviour**\n\n- Operators must review maintenance records quickly, identify affected NLG fittings, track landing counts accurately, and either overhaul/replace or retire affected fittings before the stated landing limits. They must use the referenced BAE Service Bulletin (or later EASA‑approved revision) when doing the work.\n\n**Practical considerations, costs and implementation risk**\n\n- Direct costs: purchase or modification of replacement NLG units; labour and hangar time; potential aircraft AOG (aircraft on ground) or schedule disruption.\n- Supply risk: if many operators need modified units simultaneously, lead times for parts or approved modifications could extend downtime.\n- Recordkeeping: compliance depends on accurate landing counts and overhaul records; poor records increase the burden of inspection or early replacement.\n- Regulatory cross‑references: the AD relies on a BAE Service Bulletin and any later EASA‑approved revisions; operators must ensure they use the correct revision (Requirement). The AD also notes a related UK CAA AD (informational cross‑reference).\n- Compliance enforcement: the regulator sets mandatory retirement thresholds and a short initial compliance window (30 days) for part‑number confirmation. Failure to comply exposes operators to regulatory enforcement action and to the safety risk the AD addresses.\n\n**Source‑stated purpose vs practical trade‑offs**\n\n- The stated purpose is to prevent fatigue failure arising from incorrect safe‑life data in the maintenance manual (Background). The concrete trade‑off for operators is paying near‑term replacement/modification and accepting downtime in order to reduce the risk of nose‑gear collapse. The AD creates a concentrated compliance cost on BAe 146 operators with the specified part numbers and a diffuse benefit in reduced accident risk.\n\n(References: Requirement; Compliance; Background sections of the AD.)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive addressing a specific safety-critical defect in a specific aircraft type. The scope remains precisely limited to nose landing gear retirement life for BAe 146 Series 100/200 aircraft, consistent with the original purpose of preventing fatigue failure."},"complexity_factors":["Single, specific technical requirement with clear thresholds","Only 2 main action items (identification and replacement)","Three alternative compliance deadlines (whichever comes first), but clearly structured as 'a, b, or c'","Minimal cross-referencing: only one external document (Service Bulletin ISB 32-169) and one related foreign directive","No defined terms section — uses standard aviation terminology","Short document (approximately 200 words of substantive content)","Single applicability criterion (specific aircraft models)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to a specific type of aircraft: the **British Aerospace BAe 146 Series 100 and 200**.\n\n**What it does:**\nThe directive orders airlines and aircraft operators to **inspect and replace the nose landing gear (the front wheels)** on these planes because the manufacturer's maintenance manual contained **incorrect safety information**. The nose landing gear has a limited \"safe life\" — a maximum number of landings before metal fatigue makes it unsafe.\n\n**Who it affects:**\n- Airlines and operators flying BAe 146-100 and BAe 146-200 aircraft\n- Maintenance crews responsible for these planes\n\n**What must happen:**\n1. **Within 30 days** of 17 March 2005: Check the part number of the nose landing gear against a specific service bulletin (technical notice) from the manufacturer\n2. **Before reaching any of these limits**, replace the nose landing gear with a modified unit:\n   - **8,000 landings** since the gear was last overhauled, **OR**\n   - **35,000 landings** since the gear was new, **OR**\n   - **500 landings** after 17 March 2005 (if that deadline comes later than the other two)\n\n**Why it matters:**\nOperating beyond these limits risks **fatigue cracks** developing in the nose landing gear's main structure. This could cause **sudden failure and collapse of the front landing gear** during landing — a serious safety hazard.\n\nThe directive references a similar UK safety order (UK CAA AD G-2005-0001), showing this was an international safety concern."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-113-nose-landing-gear-retirement-life","history":"/api/acts/ad-bae-146-113-nose-landing-gear-retirement-life/history","analysis":"/api/acts/ad-bae-146-113-nose-landing-gear-retirement-life/analysis","conflicts":"/api/acts/ad-bae-146-113-nose-landing-gear-retirement-life/conflicts","importantCases":"/api/acts/ad-bae-146-113-nose-landing-gear-retirement-life/important-cases","documents":"/api/acts/ad-bae-146-113-nose-landing-gear-retirement-life/documents"}}