{"id":"F2006B02135","name":"AD/AC/75 - Main Cabin Door Fasteners - Inspection","slug":"ad-ac-75-main-cabin-door-fasteners-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41365,"registerId":"commonwealth-F2006B02135-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/75 - Main Cabin Door Fasteners - Inspection","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 9/1981,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Main Cabin Door Fasteners - Inspection,75\ntitle: Airworthiness Directive - AD/AC/75 - Main Cabin Door Fasteners - Inspection\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes\n\n \n\nAD/AC/75 Main Cabin Door Fasteners - Inspection 9/81\n\nApplicability: All models 690A and 690B with S/Nos. 11100 to 11566.\n\n \n\nAll models 690C with S/Nos. 11600 to 11670.\n\n \n\nAll models 695 with S/Nos. 95000 to 95007, 95009 to 95071.\n\n \n\nDocument: Gulfstream American Commander Division SB No. 184. Compliance: Within 25 hours’ time in service after 10 August 1981.\n\nBackground:  It is possible that some cabin door fasteners may have failed completely or partially from shear loads experienced in service.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1453},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains precisely targeted at its original purpose: addressing a specific mechanical failure mode (shear failure of door fasteners) in defined Twin Commander aircraft. No expansion beyond the original airworthiness safety concern."},"complexity_factors":["Single, unambiguous action required (inspection of specific component)","Narrow applicability limited to four specific aircraft models with defined serial number ranges","Simple compliance trigger (25 hours time-in-service from specific date)","No exceptions, conditional clauses, or nested provisions","References only one external technical standard"],"plain_english_summary":"**What this requires:** Owners and operators of specific Twin Commander aircraft must inspect the fasteners (screws/bolts) on the main cabin door.\n\n**Who it affects:** Only the following aircraft with these exact serial numbers:\n- Models 690A and 690B (Serial Nos. 11100 to 11566)\n- Model 690C (Serial Nos. 11600 to 11670)  \n- Model 695 (Serial Nos. 95000 to 95007 and 95009 to 95071)\n\n**What the problem is:** Some door fasteners may have cracked or broken due to stress during flight (shear loads). A failed door could cause rapid cabin decompression or other serious safety issues.\n\n**What you must do:** Complete the inspection within 25 hours of flying time after 10 August 1981, following the procedure in Gulfstream Service Bulletin No. 184.\n\n**Why it matters:** Prevents the main cabin door from failing in flight, protecting passengers and crew from decompression hazards."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-75-main-cabin-door-fasteners-inspection","history":"/api/acts/ad-ac-75-main-cabin-door-fasteners-inspection/history","analysis":"/api/acts/ad-ac-75-main-cabin-door-fasteners-inspection/analysis","conflicts":"/api/acts/ad-ac-75-main-cabin-door-fasteners-inspection/conflicts","importantCases":"/api/acts/ad-ac-75-main-cabin-door-fasteners-inspection/important-cases","documents":"/api/acts/ad-ac-75-main-cabin-door-fasteners-inspection/documents"}}