{"id":"F2006B02982","name":"AD/B737/80 Amdt 1 - Wing Leading Edge Panel","slug":"ad-b737-80-amdt-1-wing-leading-edge-panel","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42341,"registerId":"commonwealth-F2006B02982-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/80 Amdt 1 - Wing Leading Edge Panel","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBoeing 737 Series Aeroplanes\n\nAD/B737/80\n\nAmdt 1\n\n  \nWing Leading Edge Panel 4/95\n\nApplicability: Model 737-300, \\-400, and \\-500 series aircraft, with line numbers 1001 through 1976,\n\n1978 through 2197, and 2199.\n\nRequirement: Modify the leading edge slat and internal structure at Front Spar Station 250.663 in accordance with Boeing Service Bulletin 737-57-1221.\n\nNote: FAA AD 94-06-11 Amdt 39-8858 and AD 94-26-13 Amdt 39-9108 refer.\n\nCompliance: Unless already accomplished, prior to 21 April 1996.\n\nBackground: Reports were received of fuel leakage from the fuel line at front spar station 250.663, which then flowed through a drain hole in a slat access panel and into the turbine exhaust area.\n\nAmendment 1 is issued in response to a new FAA AD which expands the applicability to include additional affected aircraft.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 expands the AD's applicability to include additional affected aircraft (additional line numbers). The mechanical requirement (modify the leading edge slat and internal structure per Boeing Service Bulletin 737-57-1221) and the compliance deadline remain in place; the change was to the set of aircraft required to comply (Amendment 1; Applicability)."},"complexity_factors":["Technical nature of the required modification at a specific structural station (Front Spar Station 250.663) increases execution complexity (Requirement; Background).","Precise applicability defined by model and multiple line-number ranges requires operators to check serial/line-number records (Applicability).","Mandated conformity to Boeing Service Bulletin 737-57-1221 means the operator must obtain and follow manufacturer procedures and parts (Requirement).","Fixed compliance deadline imposes scheduling and potential downtime costs for operators (Compliance).","Cross-reference to FAA ADs and issuance of an Amendment expands regulated population and requires coordination with international directives (Note; Amendment 1)."],"plain_english_summary":"Operators of Boeing 737-300/400/500 aeroplanes within the listed line numbers must modify the leading edge slat and internal structure at front spar station 250.663 exactly per Boeing Service Bulletin 737-57-1221, completed by 21 April 1996. The AD was issued to stop a fuel-leak path into the turbine exhaust area; operators (or their maintenance organisations) bear parts, labour and downtime costs, with the Civil Aviation Safety Authority enforcing compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"Amendment 1 explicitly expands the scope beyond the original directive. The original AD covered a subset of affected aircraft; this amendment adds more line numbers (production batches) after the FAA identified additional at-risk planes. The core purpose (fixing the fuel leak/fire risk) remains unchanged, but the reach has broadened."},"complexity_factors":["Single, specific technical requirement with clear reference to Boeing Service Bulletin","Limited applicability — only three aircraft models with specific line number ranges","Simple compliance deadline with single exception (\"unless already accomplished\")","No nested definitions, cross-references to other legislation, or conditional logic","Straightforward background explanation of safety risk","Document is essentially a one-page safety order with minimal legal machinery"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety fix ordered by Australia's aviation regulator (CASA) for specific Boeing 737 aircraft.\n\n**What it does:**\nOrders airlines and aircraft owners to modify the wing's leading edge (the front part of the wing) at a specific structural point called \"Front Spar Station 250.663.\" The fix must follow Boeing's official repair instructions (Service Bulletin 737-57-1221).\n\n**Why it matters:**\nFuel was leaking from a fuel line, draining through a panel hole, and flowing dangerously close to the hot engine exhaust — a clear fire risk. This directive prevents potential catastrophic fires.\n\n**Who it affects:**\nSpecific Boeing 737-300, -400, and -500 series aircraft with particular production line numbers (1001-1976, 1978-2197, and 2199). Not all 737s — just these specific models and manufacturing batches.\n\n**The deadline:**\nThe modification had to be completed before 21 April 1996 (unless already done).\n\n**What's new in this version (Amendment 1):**\nThe original directive has been expanded to cover more aircraft than initially thought, following updated safety information from the US Federal Aviation Administration (FAA)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-80-amdt-1-wing-leading-edge-panel","history":"/api/acts/ad-b737-80-amdt-1-wing-leading-edge-panel/history","analysis":"/api/acts/ad-b737-80-amdt-1-wing-leading-edge-panel/analysis","conflicts":"/api/acts/ad-b737-80-amdt-1-wing-leading-edge-panel/conflicts","importantCases":"/api/acts/ad-b737-80-amdt-1-wing-leading-edge-panel/important-cases","documents":"/api/acts/ad-b737-80-amdt-1-wing-leading-edge-panel/documents"}}