{"id":"F2005L03968","name":"AD/B737/271 - Aileron Control Transfer Mechanism","slug":"ad-b737-271-aileron-control-transfer-mechanism","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39850,"registerId":"commonwealth-F2005L03968-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 737 Series Aeroplanes","sectionType":"division","heading":"Boeing 737 Series Aeroplanes","content":"### Boeing 737 Series Aeroplanes\n\n| AD/B737/271 | Aileron Control Transfer Mechanism | 1/2006 |\n| ----------- | ---------------------------------- | ------ |\n\n| Applicability: | Model 737-100 and -200 series aeroplanes; as listed in Boeing 737 Service Bulletin 27-1033 dated 13 February 1970. |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Unless previously accomplished:Replace the aileron control transfer mechanism, part number (P/N) 65-54200-4 or -5, with a new modified mechanism in accordance with Procedure 1 of the Accomplishment Instructions of Boeing 737 Service Bulletin 27-1033; OrRework the existing aileron control transfer mechanism, P/N 65-54200-4 or -5, in accordance with Procedure II of the Accomplishment Instructions of Boeing 737 Service Bulletin 27-1033.2. Do not install an aileron control transfer mechanism having P/N 65-54200-4 or -5 unless it has been reworked in accordance with Procedure II of the Accomplishment Instructions of Boeing 737 Service Bulletin 27-1033.Note: FAA AD 97-01-10 Amendment 39-9881 refers. |\n| Compliance: | 1. Within 30 days after the effective date of this AD.2. After the effective date of this AD. |\n| | This Airworthiness Directive becomes effective on 19 January 2006. |\n| Background: | This AD is issued to prevent an unexpected, significant control upset due to mechanical interference within the lateral control system transfer mechanism. This could result in reduced travel of a control wheel and above normal control wheel forces during a jam override. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n29 November 2005","sortOrder":0},{"sectionNumber":"AD/B737/271","sectionType":"part","heading":"AD/B737/271","content":"## AD/B737/271","sortOrder":1},{"sectionNumber":"Aileron Control Transfer Mechanism","sectionType":"part","heading":"Aileron Control Transfer Mechanism","content":"## Aileron Control Transfer Mechanism","sortOrder":2},{"sectionNumber":"1/2006","sectionType":"part","heading":"1/2006","content":"## 1/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD stays within the original, narrow technical purpose: remedial action on a specific aileron transfer mechanism design to eliminate mechanical interference that could cause reduced control travel and high forces during a jam-override. It does not broaden obligations beyond replacing or reworking the identified part numbers for the listed aeroplanes, and it cross-references the Boeing service bulletin and an earlier FAA AD as the technical source. There is no substantive expansion of scope beyond that original safety objective."},"complexity_factors":["Short, focused directive (single technical issue)","Two alternative compliance methods (replace per Procedure 1, or rework per Procedure II)","Specific part numbers referenced (P/N 65-54200-4 and -5)","Applicability relies on an external document (Boeing Service Bulletin 27-1033) for exact aeroplane listing and procedures","Cross-reference to another regulator's AD (FAA AD 97-01-10)","Clear, short compliance timeframe (30 days) and a simple installation prohibition"],"plain_english_summary":"This AD requires operators of certain early Boeing 737-100/200s to replace or rework the aileron control transfer mechanism (P/N 65‑54200‑4 or ‑5) per Boeing SB 27‑1033 within 30 days, and prohibits installing unmodified units thereafter. It affects owners/operators of listed legacy airframes, shifts costs and downtime to them, and aims to prevent mechanical interference that could reduce control travel or increase forces in a jam‑override, risking loss of safe lateral control."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow, technical scope. It addresses a specific mechanical defect in a specific aircraft type with precise part numbers. There is no evidence of scope creep; the directive remains tightly focused on the aileron control transfer mechanism safety issue as originally identified."},"complexity_factors":["Very short document (approximately 250 words of substantive content)","Only 2 defined part numbers (P/N 65-54200-4 and -5)","Single cross-reference to one FAA AD and one Boeing Service Bulletin","Simple binary compliance structure: replace OR rework","Clear, unambiguous deadline (30 days from effective date)","No nested exceptions or conditional logic — straightforward applicability to specific aircraft models","Minimal legislative machinery — direct operational instruction format typical of technical safety directives"],"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 older **Boeing 737-100 and 737-200 aircraft**.\n\n**What it does:**\n- Requires airlines to **replace or repair a specific part** in the aileron control system (the mechanism that helps steer the plane by moving the wing flaps)\n- The part in question is the **aileron control transfer mechanism** — a component that transfers control inputs between the pilot's control wheel and the actual wing surfaces\n- **Two options for compliance:**\n 1. **Replace** the old part (P/N 65-54200-4 or -5) with a new, improved version\n 2. **Rework** (repair/modify) the existing part following specific Boeing instructions\n- **Also prohibits** installing any unmodified version of this part after the directive takes effect\n\n**Why it matters:**\nThe old part can cause **mechanical interference** in the control system. In plain terms: the control wheel could jam or become unexpectedly hard to turn during flight, especially if the pilot needs to override a jam. This creates a serious safety risk during critical flight phases like takeoff or landing.\n\n**Timeline:**\n- Airlines must complete the work **within 30 days** of 19 January 2006\n- No unmodified parts can be installed after that date\n\n**Who it affects:**\n- Airlines operating these specific Boeing 737 models\n- Maintenance organisations servicing these aircraft\n- The directive references an equivalent **FAA (US) safety order**, showing this is an internationally recognised safety issue"},"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-b737-271-aileron-control-transfer-mechanism","history":"/api/acts/ad-b737-271-aileron-control-transfer-mechanism/history","analysis":"/api/acts/ad-b737-271-aileron-control-transfer-mechanism/analysis","conflicts":"/api/acts/ad-b737-271-aileron-control-transfer-mechanism/conflicts","importantCases":"/api/acts/ad-b737-271-aileron-control-transfer-mechanism/important-cases","documents":"/api/acts/ad-b737-271-aileron-control-transfer-mechanism/documents"}}