{"id":"F2006B01931","name":"AD/A320/40 - Centre Fuselage - Belly Reinforcement","slug":"ad-a320-40-centre-fuselage-belly-reinforcement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41153,"registerId":"commonwealth-F2006B01931-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A320/40 - Centre Fuselage - Belly Reinforcement","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/A320/40 Centre Fuselage \\- Belly Reinforcement 9/94\n\nApplicability: All A320 aircraft, serial numbers 3 to 92 inclusive.\n\nRequirement: Replace the angle brackets and shear plates between the keel beam and RH and LH belly-fairing support frames in accordance with the Accomplishment Instructions of Airbus Industrie Service Bulletin A320-53-1014.\n\nNote: DGAC AD 92-201-030(B) refers.\n\nCompliance: Before 12000 flights.\n\nThis AD is effective from 18 August 1994.\n\nBackground: The manufacturer’s fatigue test has revealed damage in the area of the keel beam and belly-fairing support frames as early as 6000 simulated flights. Embodiment of this modification will increase the structural integrity of the affected components.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1373},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains precisely targeted at its original purpose: addressing the specific fatigue vulnerability identified in early-production A320 aircraft. The scope is narrowly confined to the identified structural weakness and has not expanded beyond the original serial number range or structural components identified in the 1994 safety assessment."},"complexity_factors":["Single, unambiguous applicability criterion (aircraft serial numbers 3-92)","One clear mandatory action referencing a single technical standard","Simple compliance threshold (flight count limit)","No exceptions, exemptions, or conditional provisions","Minimal cross-referencing (only one related foreign aviation directive)"],"plain_english_summary":"This Airworthiness Directive requires operators of early Airbus A320s (serial nos. 3–92) to replace specific angle brackets and shear plates in the centre fuselage per Airbus Service Bulletin A320-53-1014 to stop fatigue cracking discovered in the keel-beam/belly-fairing attachments. The modification must be done before 12,000 flights to preserve structural integrity and safe continued operation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a320-40-centre-fuselage-belly-reinforcement","history":"/api/acts/ad-a320-40-centre-fuselage-belly-reinforcement/history","analysis":"/api/acts/ad-a320-40-centre-fuselage-belly-reinforcement/analysis","conflicts":"/api/acts/ad-a320-40-centre-fuselage-belly-reinforcement/conflicts","importantCases":"/api/acts/ad-a320-40-centre-fuselage-belly-reinforcement/important-cases","documents":"/api/acts/ad-a320-40-centre-fuselage-belly-reinforcement/documents"}}