{"id":"F2006B02638","name":"AD/B727/117 - Inboard T/E Flaps Inboard Track","slug":"ad-b727-117-inboard-t-e-flaps-inboard-track","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41954,"registerId":"commonwealth-F2006B02638-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/117 - Inboard T/E Flaps Inboard Track","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 727 Series Aeroplanes\n\nAD/B727/117 Inboard T/E Flaps Inboard Track 8/90\n\nApplicability: All models 727.\n\nRequirement: Action in accordance with FAA AD 90-07-05 Amendment 39-6548, Parts A, B, C and D.\n\nNote: Boeing SB 727-57-0178 Rev 3, and Boeing SB 727-57-117 Rev 5 refer.\n\nCompliance: Unless previously accomplished:\n\nFor Part A: Prior to exceeding 1000 flight cycles after 9 August 1990 or prior to 28 February 1991, whichever occurs first, and thereafter in accordance with the Requirement Document.\n\nFor Part B: Prior to (1) or (2) below, whichever occurs later, and thereafter in accordance with the Requirement document.\n\n    (1) Prior to exceeding 9000 flight cycles or 6 years since modification, whichever occurs first; or\n\n    (2) Prior to exceeding 1000 flight cycles after 9 August 1990, or prior to 28 February 1991, whichever occurs first.\n\nFor Part C: Prior to (1) or (2) below whichever occurs later, and thereafter in accordance with the Requirement document.\n\n    (1) Prior to exceeding 12000 flight cycles or 8 years since repair whichever occurs first, or\n\n    (2) Prior to exceeding 1000 flight cycles after 9 August 1990, or prior to 28 February 1991, whichever occurs first.\n\nFor Part D: Compliance in accordance with the Requirement document constitutes terminating action for the inspection requirements of the Directive.\n\nBackground: Country of origin AD. Cracking and/or corrosion of the flap tracks has occurred and if not corrected could lead to separation of a flap.","sortOrder":0}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive implementing a foreign (US FAA) safety order. It maintains its original narrow scope: addressing a specific structural defect in a specific aircraft type. No scope creep is evident."},"complexity_factors":["Multiple compliance pathways with nested 'whichever occurs first/later' logic","Four distinct parts (A, B, C, D) with different triggering conditions","Cross-reference to external FAA directive (AD 90-07-05) without reproducing its content","Reference to Boeing Service Bulletins (SB 727-57-0178 and SB 727-57-117) for technical details","Time-based and cycle-based thresholds creating intersecting deadlines","Terminating action provision (Part D) that modifies ongoing obligations"],"plain_english_summary":"This mandatory Airworthiness Directive requires Australian operators and maintenance crews of Boeing 727s to inspect and repair cracking and corrosion in the inboard trailing edge flap tracks — following the schedule in FAA AD 90‑07‑05. It’s safety‑critical and legally binding: if not corrected, flap separation could occur, risking loss of control. Compliance deadlines vary by flight cycles, past modifications/repairs, and specified calendar dates."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The AD's scope aligns with its stated purpose in the Background and Applicability: it targets cracking and corrosion of inboard flap tracks on all Boeing 727 models and requires operators to follow the FAA AD and referenced Boeing service bulletins. The directive does not expand obligations beyond inspections, repairs/modifications and a terminating action for inspections as described in the Requirement and Compliance text."},"complexity_factors":["Cross‑reference to an external FAA document: Requirement mandates action in accordance with FAA AD 90‑07‑05, Parts A–D (\"Requirement: Action in accordance with FAA AD 90-07-05 Amendment 39-6548, Parts A, B, C and D\").","Multiple Parts with distinct rules: Parts A, B, C and D each carry different compliance triggers and effects (see \"For Part A:/For Part B:/For Part C:/For Part D:\" in Compliance).","Conditional timing language: Several provisions use \"whichever occurs first\" or \"whichever occurs later\", creating multiple scheduling branches (Compliance paragraphs for Parts A–C).","Mixed metric thresholds: Compliance depends on flight cycles (1000, 9000, 12000) and calendar time (6 years, 8 years) tied to modification or repair (Compliance: 1000/9000/12000 cycles; 6/8 years).","Terminating action clause: Completing Part D is explicitly stated to terminate the inspection requirements, which affects long‑term maintenance planning (\"For Part D: Compliance ... constitutes terminating action\").","External service bulletins referenced: Boeing SB 727‑57‑0178 Rev 3 and SB 727‑57‑117 Rev 5 are noted, requiring access to manufacturer service information (\"Note: Boeing SB ... refer.\").","Wide applicability: Applies to all Boeing 727 models, so the operator population and fleet managers must incorporate the AD across all affected aircraft (\"Applicability: All models 727\").","Regulatory source and enforcement: Issued under Civil Aviation Regulations (Part 39) by the Civil Aviation Safety Authority, so operators are legally required to comply (header: \"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - CIVIL AVIATION SAFETY AUTHORITY\").","Operator cost and scheduling burden: The directive places inspection, repair or modification obligations on aircraft operators, implying direct costs, maintenance downtime and record‑keeping, because actions must be \"accomplished\" per the Requirement document (implicit from the AD's mandatory compliance language).","Implementation risk from external alignment: Because the AD imports the FAA AD and Boeing SBs, any updates or interpretive differences between documents create coordination and compliance risk for operators and maintainers."],"plain_english_summary":"This airworthiness directive requires operators of all Boeing 727 aeroplanes to inspect and, where necessary, repair or modify the inboard trailing‑edge flap inboard tracks by following FAA AD 90‑07‑05 (Parts A–D) and the referenced Boeing service bulletins. Compliance is tied to specific flight‑cycle and calendar thresholds, and completing Part D ends the inspection obligation. The measure addresses cracking and corrosion of flap tracks that could lead to flap separation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-117-inboard-t-e-flaps-inboard-track","history":"/api/acts/ad-b727-117-inboard-t-e-flaps-inboard-track/history","analysis":"/api/acts/ad-b727-117-inboard-t-e-flaps-inboard-track/analysis","conflicts":"/api/acts/ad-b727-117-inboard-t-e-flaps-inboard-track/conflicts","importantCases":"/api/acts/ad-b727-117-inboard-t-e-flaps-inboard-track/important-cases","documents":"/api/acts/ad-b727-117-inboard-t-e-flaps-inboard-track/documents"}}