{"id":"F2005L01350","name":"AD/B737/244 - Engine Strut Seal","slug":"ad-b737-244-engine-strut-seal","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":35138,"registerId":"commonwealth-F2005L01350-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/B737/244 | Engine Strut Seal | 7/2005 |\n| ----------- | ----------------- | ------ |\n\n| Applicability: | Model 737-600, -700, and -800 series aircraft, as identified in Boeing Special Attention Service Bulletin 737-54-1040 Revision 1, dated 14 August 2003, or later FAA approved revision.                                                                                                                   |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2005-08-10 Amdt 39-14062.Note: Boeing Special Attention Service Bulletins 737-54-1040 original issue,737-54-1040 Revision 1, or later FAA approved revision, refer.                                                                        |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of 7 July 2005.                                                                                                                                                                                                                   |\n|                | This Airworthiness Directive becomes effective on 7 July 2005.                                                                                                                                                                                                                                            |\n| Background:    | The FAA received a report that an injection seal in the engine strut area may not have been properly completed or installed during production. This condition could allow leaking flammable fluid onto a hot engine exhaust nozzle or into the engine core fire zone, and a consequent uncontrolled fire. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n25 May 2005","sortOrder":0},{"sectionNumber":"AD/B737/244","sectionType":"part","heading":"AD/B737/244","content":"## AD/B737/244","sortOrder":1},{"sectionNumber":"Engine Strut Seal","sectionType":"part","heading":"Engine Strut Seal","content":"## Engine Strut Seal","sortOrder":2},{"sectionNumber":"7/2005","sectionType":"part","heading":"7/2005","content":"## 7/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"This AD addresses a specific production/installation defect (an improperly completed or installed injection seal) and requires the remedial technical actions set out in the FAA AD and Boeing Service Bulletin for a defined set of 737 variants. It remains narrowly targeted to that safety issue and those aircraft. It does not broaden the regulatory scope beyond that original safety-focused purpose."},"complexity_factors":["Direct cross-reference to an external FAA Airworthiness Directive (FAA AD 2005-08-10) for mandatory technical requirements","Normative reliance on a manufacturer service bulletin (Boeing SB 737-54-1040 Rev 1) with allowance for later FAA-approved revisions","Narrow model-specific applicability (only 737-600, -700, -800 series identified in the service bulletin)","Short primary instrument text that delegates technical detail to lengthy external documents (creates complexity in practice)","Single effective date (7 July 2005) and no additional Australian-specific procedures or exemptions in the text"],"plain_english_summary":"This Airworthiness Directive (effective 7 July 2005) requires operators of specified Boeing 737-600/700/800 aircraft to perform the inspections and any repairs set out in FAA AD 2005-08-10 and Boeing Service Bulletin 737‑54‑1040.\n\nThe AD addresses a potential engine‑strut injection‑seal defect that could let flammable fluid reach hot areas and cause an uncontrolled fire; operators (or their maintenance providers) pay for and schedule the mandated work while CASA enforces compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive addressing a specific manufacturing defect in specific aircraft models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 3 defined applicability criteria (specific aircraft models)","Single requirement referencing external technical document (FAA AD)","No nested conditions or exceptions","No cross-references to other Australian legislation","Straightforward compliance deadline (single date)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order for aircraft. It requires owners and operators of specific Boeing 737 models (-600, -700, and -800 series) to inspect and fix a potentially dangerous manufacturing defect in the engine strut seal.\n\n**The problem:** Some 737s may have been built with an injection seal in the engine strut area that wasn't properly completed or installed. This could let flammable fluid leak onto hot engine parts or into fire zones, potentially causing an uncontrolled fire.\n\n**What must be done:** Aircraft operators must follow the technical instructions in a US Federal Aviation Administration (FAA) safety order (AD 2005-08-10) and a Boeing service bulletin to inspect and correct the seal issue.\n\n**Who this affects:** Airlines and operators flying the affected Boeing 737 models.\n\n**Why it matters:** This is a fire-prevention measure. The directive makes compliance mandatory rather than optional, ensuring the safety defect is addressed across the fleet."},"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-b737-244-engine-strut-seal","history":"/api/acts/ad-b737-244-engine-strut-seal/history","analysis":"/api/acts/ad-b737-244-engine-strut-seal/analysis","conflicts":"/api/acts/ad-b737-244-engine-strut-seal/conflicts","importantCases":"/api/acts/ad-b737-244-engine-strut-seal/important-cases","documents":"/api/acts/ad-b737-244-engine-strut-seal/documents"}}