{"id":"F2006B01947","name":"AD/A320/59 Amdt 1 - Central Fuselage, Frame and Frame Feet at Frames FR37 Through FR41","slug":"ad-a320-59-amdt-1-central-fuselage-frame-and-frame-feet-at-frames-fr37-through-fr41","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41169,"registerId":"commonwealth-F2006B01947-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A320/59 Amdt 1 - Central Fuselage, Frame and Frame Feet at Frames FR37 Through FR41","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)  \nAirbus Industrie A319, A320 and A321 Series Aeroplanes\n\nAD/A320/59\n\nAmdt 1\n\n  \n\nCentral Fuselage, Frame and Frame Feet at Frames FR37 Through FR41\n\n  \n3/99\n\nApplicability: All Model A319, A320, and A321 aircraft without Airbus Industrie (Airbus) modifications 25896 or 25592 or 25593 installed in production, or Airbus Service Bulletin A320-53-1128.\n\nRequirement: Inspect in accordance with Airbus Service Bulletin A320-53-1141.\n\nNote: DGAC AD 98-509-123(B) refers.\n\nCompliance: In accordance with the thresholds and instructions, and repeat inspection requirements defined in the Requirement Document; until accomplishment of Airbus Service Bulletin A320-53-1128.\n\nThis Amendment becomes effective on 25 March 1999.\n\nBackground: Cracks were found around fastener holes between frames FR37 and FR41 during an inspection program of fastener holes of left hand and right hand side frame feet, in accordance with Airbus Service Bulletin A320-53-1025.\n\nThe original issue of this Airworthiness Directive became effective on 17 August 1995.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive (AD/A320/59 originally issued 1995). The scope remains tightly focused on the original safety issue — cracks in the central fuselage frame feet at specific frame locations. The amendment appears to update compliance requirements or inspection thresholds without expanding beyond the original structural concern."},"complexity_factors":["Short, single-purpose document (approximately 200 words)","Only 3 defined applicability criteria (specific Airbus modifications/service bulletins)","Single primary requirement with one cross-reference to an external technical document (Airbus Service Bulletin A320-53-1141)","Simple conditional structure: inspect until modification complete","No nested exceptions or complex definitional sections","Technical aviation terminology is used but is standard for the industry (frame numbers, service bulletins, fastener holes)"],"plain_english_summary":"CASA requires owners/operators of certain Airbus A319/A320/A321 aircraft to repeat inspections of the central fuselage at frames FR37–FR41 per Airbus Service Bulletin A320‑53‑1141 until a permanent modification is installed. It applies to aircraft without specific factory mods or without Service Bulletin A320‑53‑1128. Cracks found around fastener holes could affect structural integrity, so compliance is mandatory."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This amendment narrows and clarifies the applicability and the inspection mandate by referencing Airbus Service Bulletin A320-53-1141 as the inspection requirement and by excluding aircraft that already have certain production modifications or SB A320-53-1128 applied. It also sets compliance as continuing (repeat inspections) until SB A320-53-1128 is accomplished, updating the original 1995 AD's regime."},"complexity_factors":["Dependence on multiple external Airbus Service Bulletins (A320-53-1141; A320-53-1128) and a separate Requirement Document for thresholds and repeat intervals.","Conditional applicability: applies only to aircraft without specified production modifications (25896, 25592, 25593) or without SB A320-53-1128.","Ongoing compliance obligation until a later Service Bulletin is accomplished, requiring tracking of status over time.","Technical inspection work (fastener-hole cracking) requiring specialised maintenance procedures and judgement by maintenance organisations.","Cross-reference to foreign authority (DGAC AD) and prior AD history increases regulatory tracing and record-keeping burden."],"plain_english_summary":"This Airworthiness Directive requires operators of Airbus A319, A320 and A321 aircraft (unless those aircraft have specific production modifications or have had Service Bulletin A320-53-1128 applied) to inspect the central fuselage frames FR37–FR41 and the frame feet following Airbus Service Bulletin A320-53-1141, with the thresholds and repeat intervals set in the Requirement Document and continuing until SB A320-53-1128 is accomplished. The AD responds to discovered cracks around fastener holes between frames FR37 and FR41 and became effective 25 March 1999."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a320-59-amdt-1-central-fuselage-frame-and-frame-feet-at-frames-fr37-through-fr41","history":"/api/acts/ad-a320-59-amdt-1-central-fuselage-frame-and-frame-feet-at-frames-fr37-through-fr41/history","analysis":"/api/acts/ad-a320-59-amdt-1-central-fuselage-frame-and-frame-feet-at-frames-fr37-through-fr41/analysis","conflicts":"/api/acts/ad-a320-59-amdt-1-central-fuselage-frame-and-frame-feet-at-frames-fr37-through-fr41/conflicts","importantCases":"/api/acts/ad-a320-59-amdt-1-central-fuselage-frame-and-frame-feet-at-frames-fr37-through-fr41/important-cases","documents":"/api/acts/ad-a320-59-amdt-1-central-fuselage-frame-and-frame-feet-at-frames-fr37-through-fr41/documents"}}