{"id":"F2006B01981","name":"AD/A320/91 - Frames 43 and 44 Pressure Floor Connection","slug":"ad-a320-91-frames-43-and-44-pressure-floor-connection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41203,"registerId":"commonwealth-F2006B01981-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A320/91 - Frames 43 and 44 Pressure Floor Connection","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/A320/91 Frames 43 and 44 Pressure Floor Connection 2/98\n\nApplicability: Model A320 with MSN 005 through 008, 010 through 014, and 016 through 043, without Modification 20941 or Service Bulletin A320-53-1015 incorporated.\n\nRequirement: 1. Inspect bolts and fittings of the frame to pressure floor connection at frames 43 and 44 in accordance with Airbus Industrie Service Bulletin A320-53-1083 revision 2.\n\n    2. If bolts are found cracked and/or missing and/or fittings are cracked, apply the corresponding inspection program and corrective actions in accordance with the instructions given in Service Bulletins A320-53-1083 revision 2 and A320-53- 1015.\n\n    3. If no crack is detected on the frames and bolts, repeat the inspection as defined in Requirement 1 of this Directive.\n\nNote: DGAC AD 97-316-110 (B) refers.\n\nCompliance: 1. Before the accumulation of 20,000 flights.\n\n    2. At the thresholds and intervals specified in the Requirement 2 documents.\n\n    3. At intervals not to exceed 5,100 flights after initial inspection. This airworthiness directive becomes effective on 29 January 1998.\n\nBackground: During a full scale fatigue test, a bolt at frame 43, which connects the frame segment with the pressure floor, sheared off. A crack developed after further simulated flights.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific structural defect identified during fatigue testing. The scope remains precisely limited to the identified risk (frame 43/44 bolt failures) on the affected aircraft population. No scope creep is evident."},"complexity_factors":["Single, specific technical requirement with clear sequential steps (3 numbered requirements)","Limited applicability scope (specific aircraft serial numbers and modification status)","References to external technical documents (Airbus Service Bulletins) without reproducing their content","Simple conditional logic (if cracked → repair; if not cracked → re-inspect)","Straightforward compliance deadlines (flight count thresholds)","No nested definitions or interpretation sections","Background explanation provided in plain language"],"plain_english_summary":"This Airworthiness Directive orders owners/operators of certain early-model Airbus A320s (specific serial numbers) to inspect bolts and fittings where the pressure floor meets the fuselage at frames 43/44, unless Mod 20941 or SB A320-53-1015 is already embodied. Inspections follow Airbus SB A320-53-1083, require repair if damage is found, and repeat every 5,100 flights (first before 20,000). It prevents a test-identified bolt fracture that could cause loss of cabin pressure."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive applies to a defined subset of A320 MSNs and excludes aircraft with a specific modification or service bulletin incorporated (Applicability). The measures are targeted to address the fatigue failure observed in testing (Background) and the text does not indicate an expansion beyond that safety focus."},"complexity_factors":["Dependency on external documents: mandatory inspections and corrective actions are defined by Airbus Service Bulletin A320‑53‑1083 revision 2 and A320‑53‑1015 (Requirement 1–2).","Applicability carve‑outs: only specific MSN ranges are covered and aircraft with Mod 20941 or SB A320‑53‑1015 incorporated are excluded (Applicability).","Conditional branching: discovery of cracked/missing bolts or cracked fittings triggers alternate inspection programs and corrective actions rather than a single fixed remedy (Requirement 2).","Multiple compliance thresholds: initial inspection deadline (before 20,000 flights) and repeat interval max (not to exceed 5,100 flights) plus further thresholds set by the corrective action documents (Compliance).","Operational impact and enforcement: inspections, potential repairs and repeated monitoring impose planning, downtime and cost burdens on operators and require regulator oversight (Requirement/Compliance/Background)."],"plain_english_summary":"This airworthiness directive requires operators of specified Airbus A320 family aeroplanes (listed MSNs, excluding aircraft with Modification 20941 or Service Bulletin A320‑53‑1015 already incorporated) to inspect the bolts and fittings that join frames 43–44 to the pressure floor and to carry out Airbus‑specified corrective actions if defects are found. Operators must meet set inspection deadlines (initial and repeat intervals); the regulator enforces compliance to prevent bolt/fitting failure identified in fatigue testing."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-a320-91-frames-43-and-44-pressure-floor-connection","history":"/api/acts/ad-a320-91-frames-43-and-44-pressure-floor-connection/history","analysis":"/api/acts/ad-a320-91-frames-43-and-44-pressure-floor-connection/analysis","conflicts":"/api/acts/ad-a320-91-frames-43-and-44-pressure-floor-connection/conflicts","importantCases":"/api/acts/ad-a320-91-frames-43-and-44-pressure-floor-connection/important-cases","documents":"/api/acts/ad-a320-91-frames-43-and-44-pressure-floor-connection/documents"}}