{"id":"F2005L03965","name":"AD/B737/272 - Thrust Reverser Ground Logic","slug":"ad-b737-272-thrust-reverser-ground-logic","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39844,"registerId":"commonwealth-F2005L03965-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/B737/272 | Thrust Reverser Ground Logic | 1/2006 |\n| ----------- | ---------------------------- | ------ |\n\n| Applicability: | Boeing Model 737-100 and 737-200 series airplanes, which presently do not use nose gear compression logic to enable thrust reversers.                                                                                                                                     |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Install an approved modification to the Air/Ground Sensing System which causes the thrust reverser logic to be enabled by nose gear strut compression in addition to the present logic of the right main gear oleo compression.Note: FAA AD 89-08-08 Amdt 39-6191 refers. |\n| Compliance:    | Within 30 days after the effective date of this AD.                                                                                                                                                                                                                       |\n|                | This Airworthiness Directive becomes effective on 19 January 2006.                                                                                                                                                                                                        |\n| Background:    | The requirements of this AD are to ensure timely deployment of reverse thrust when landing under adverse weather and runway conditions.                                                                                                                                   |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n29 November 2005","sortOrder":0},{"sectionNumber":"AD/B737/272","sectionType":"part","heading":"AD/B737/272","content":"## AD/B737/272","sortOrder":1},{"sectionNumber":"Thrust Reverser Ground Logic","sectionType":"part","heading":"Thrust Reverser Ground Logic","content":"## Thrust Reverser Ground Logic","sortOrder":2},{"sectionNumber":"1/2006","sectionType":"part","heading":"1/2006","content":"## 1/2006","sortOrder":3}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific technical vulnerability in a defined aircraft type. It has not expanded beyond its original purpose of ensuring thrust reverser deployment reliability."},"complexity_factors":["Single, specific technical requirement with no subsections or alternatives","Only one defined applicability criterion (aircraft model and existing system configuration)","No cross-references to other legislation (only a non-binding note referencing an FAA AD for context)","Straightforward compliance deadline with no conditional extensions or exceptions","Total length is approximately 150 words of substantive content","No nested conditions, exceptions, or discretionary powers"],"plain_english_summary":"This AD orders operators of Boeing 737-100/200 aircraft in Australia to modify thrust reverser logic so nose‑gear compression can enable reverser deployment in addition to the right main gear. It addresses a safety gap where wet or slippery touchdowns might not compress the right main gear, preventing reverser activation. Affected operators must comply within 30 days of the AD (effective 19 January 2006)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD changes the ground‑sensing logic for specific 737‑100/200 aircraft by adding nose‑gear strut compression as an additional input to enable thrust reversers. That change aligns with the stated aim to ensure timely reverse‑thrust deployment in adverse conditions and does not expand the affected models or add unrelated obligations beyond the retrofit requirement and 30‑day compliance timeframe."},"complexity_factors":["Technical retrofit to safety‑critical Air/Ground Sensing System (requires certified/approved modification).","Short compliance window: 30 days from effective date increases scheduling and operational impact for operators.","Narrow fleet applicability (Boeing 737‑100/200 series) limits regulatory breadth but concentrates costs on remaining operators of these models.","Reference to existing FAA AD (89‑08‑08 Amdt 39‑6191) creates cross‑jurisdictional compliance context.","Regulatory enforceability: AD imposes mandatory modification rather than guidance, raising administrative/maintenance oversight needs."],"plain_english_summary":"This AD requires operators of Boeing 737‑100 and 737‑200 aircraft (which currently use only right main‑gear oleo compression) to install an approved modification so the Air/Ground Sensing System also uses nose‑gear strut compression to enable thrust reversers. Compliance is mandatory within 30 days of the AD (effective 19 January 2006).\n\nThe stated purpose is to ensure timely reverse‑thrust deployment on landing in adverse weather or runway conditions. The cost and installation burden fall to operators, who must obtain an approved modification and schedule work in the short compliance window."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-272-thrust-reverser-ground-logic","history":"/api/acts/ad-b737-272-thrust-reverser-ground-logic/history","analysis":"/api/acts/ad-b737-272-thrust-reverser-ground-logic/analysis","conflicts":"/api/acts/ad-b737-272-thrust-reverser-ground-logic/conflicts","importantCases":"/api/acts/ad-b737-272-thrust-reverser-ground-logic/important-cases","documents":"/api/acts/ad-b737-272-thrust-reverser-ground-logic/documents"}}