{"id":"F2006L01357","name":"AD/B737/287 - Engine Strut Aft Fairing Cavities","slug":"ad-b737-287-engine-strut-aft-fairing-cavities","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":58889,"registerId":"commonwealth-F2006L01357-current","compilationNumber":null,"startDate":"2026-04-02","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/B737/287 | Engine Strut Aft Fairing Cavities | 6/2006 |\n| ----------- | --------------------------------- | ------ |\n\n| Applicability: | Model 737-600, -700, -700C, -800, and -900 series aircraft; as listed in Boeing Service Bulletin 737-54-1041 Revision 1, dated 1 December 2005, or later FAA approved revision.                                                                                                                                                                                                        |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2006-07-04 Amdt 39-14531.                                                                                                                                                                                                                                                                                               |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of8 June 2006.                                                                                                                                                                                                                                                                                                 |\n|                | This Airworthiness Directive becomes effective on 8 June 2006.                                                                                                                                                                                                                                                                                                                         |\n| Background:    | The FAA received a report indicating that water had accumulated in the cavities of the engine strut aft fairings. Drain blockage by debris, when combined with leaking, flammable fluid lines passing through the engine strut aft fairing, could allow flammable fluids to build up in the cavity of the aft fairing; and consequently could be ignited by the engine exhaust nozzle. |\n\n![](image.001.png)  \nRichard Castles  \nDelegate of the Civil Aviation Safety Authority\n\n28 April 2006","sortOrder":0},{"sectionNumber":"AD/B737/287","sectionType":"part","heading":"AD/B737/287","content":"## AD/B737/287","sortOrder":1},{"sectionNumber":"Engine Strut Aft Fairing Cavities","sectionType":"part","heading":"Engine Strut Aft Fairing Cavities","content":"## Engine Strut Aft Fairing Cavities","sortOrder":2},{"sectionNumber":"6/2006","sectionType":"part","heading":"6/2006","content":"## 6/2006","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a narrow, specific safety purpose. It has not expanded beyond its original intent of addressing the fire risk in engine strut aft fairing cavities."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced (the Boeing Service Bulletin)","Single cross-reference to FAA AD 2006-07-04 (incorporation by reference)","No conditional logic or nested exceptions — straightforward applicability and compliance","Technical content is externalized to the referenced Boeing Service Bulletin and FAA AD"],"plain_english_summary":"This Airworthiness Directive covers certain Boeing 737-600/700/700C/800/900 series and mandates the actions in FAA AD 2006-07-04 (being adopted here) and Boeing Service Bulletin 737-54-1041 R1. It requires inspections/clearing of engine strut aft fairing drains (and any repairs) to stop water/debris or leaked fuel pooling that could ignite from exhaust heat. It affects operators and maintenance crews and is legally mandatory to prevent in‑flight engine fires."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD adopts the FAA’s corrective requirements for a specific safety hazard on listed Boeing 737 models. It does not materially expand the original safety issue’s scope; it implements (by reference) the FAA AD and the Boeing service bulletin with a revised effective date. There is no substantive broadening of affected aircraft types, actions required, or regulatory powers beyond adopting the FAA’s remedial measures."},"complexity_factors":["Short, single-issue directive focused on one airworthiness hazard","Single external normative cross-reference to FAA AD 2006-07-04 (major technical content is in that document)","Single external reference to Boeing Service Bulletin 737-54-1041 Rev 1 (1 December 2005)","Applicability limited to a specific set of Boeing 737 models (clear scope list)","No nested exceptions or multiple conditional branches in the directive itself","A minor administrative element (revised effective date) adds slight procedural complexity"],"plain_english_summary":"**What this instrument does (mechanically)\n\n- Adopts and requires compliance with the FAA Airworthiness Directive (FAA AD 2006-07-04) and the Boeing Service Bulletin 737-54-1041 Rev 1 (1 December 2005) for certain Boeing 737 models.  \n- Affected aeroplane operators must carry out the inspections, drains/clearing, repairs or modifications described in those documents to address water and debris accumulation in the engine strut aft fairing cavities.  \n- The directive takes effect on 8 June 2006.\n\nWho is affected\n\n- Airlines, lessees, private owners and maintenance organisations that operate or service Boeing 737-600, -700, -700C, -800 and -900 series aeroplanes listed in Boeing Service Bulletin 737-54-1041 Rev 1.  \n- Licensed maintenance providers who perform the inspections and corrective actions required by the FAA AD/Boeing service bulletin.\n\nWhy it matters (official rationale and practical implications)\n\n- The FAA reported water and debris accumulating in the cavities of engine strut aft fairings. If drain blockage combines with leaking flammable fluid lines routed through the fairing, flammable fluid could collect and be ignited by the engine exhaust.  The action required by this directive is intended to remove that hazard by ensuring drains are clear and any leaks or other unsafe conditions are fixed (Background; Requirement).\n\nPractical effects, costs and who decides\n\n- Who pays: aircraft operators bear the direct costs — inspection labour, possible cleaning, repair parts, and any aircraft out-of-service time.  \n- Who decides and enforces: the Civil Aviation Safety Authority (CASA) has adopted the FAA AD as the required action; operators must follow the FAA AD and the Boeing service bulletin referenced in the Applicability/Requirement.  \n- Behaviour change required: incorporate the specified inspections and any corrective work into maintenance schedules, perform the directed work within the time/intervals stated in the FAA AD/Boeing SB, and retain compliance records.\n\nTrade-offs, implementation risk and competitive effects\n\n- Trade-offs: the measure increases short‑term maintenance cost and possible aircraft downtime in exchange for reducing a fire risk associated with aft fairing cavities.  \n- Implementation risk: the directive delegates the technical method to the FAA AD and Boeing SB. That creates operational dependency on those external documents (cross‑reference risk) and on reliable supply of parts/approved repair solutions.  Non‑compliance can lead to grounding or regulatory enforcement.  \n- Effects on private enterprise: maintenance providers receive additional work; airlines/operators incur added costs and scheduling constraints. There is no change to aircraft ownership, to commercial competition between carriers, or to contractual freedom beyond the usual requirement that operators meet mandatory airworthiness directives.\n\nNotes on legal mechanics and references\n\n- The AD does not set out detailed inspection steps itself; it requires action “in accordance with the technical requirements of FAA AD 2006-07-04” and references Boeing Service Bulletin 737-54-1041 Rev 1 (Applicability; Requirement).  \n- Effective date: the AD is effective 8 June 2006 (Compliance).  \n\n(Sections referenced: Applicability; Requirement; Compliance; Background.)"},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-287-engine-strut-aft-fairing-cavities","history":"/api/acts/ad-b737-287-engine-strut-aft-fairing-cavities/history","analysis":"/api/acts/ad-b737-287-engine-strut-aft-fairing-cavities/analysis","conflicts":"/api/acts/ad-b737-287-engine-strut-aft-fairing-cavities/conflicts","importantCases":"/api/acts/ad-b737-287-engine-strut-aft-fairing-cavities/important-cases","documents":"/api/acts/ad-b737-287-engine-strut-aft-fairing-cavities/documents"}}