{"id":"F2006B11090","name":"AD/LEARJET 35/12 - Upper Cabin Door Locking Mechanism - Modification","slug":"ad-learjet-35-12-upper-cabin-door-locking-mechanism-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56750,"registerId":"commonwealth-F2006B11090-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET 35/12 - Upper Cabin Door Locking Mechanism - Modification","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)  \nGates Learjet 35 and 36 Series Aeroplanes\n\nAD/LEARJET 35/12 Upper Cabin Door Locking Mechanism - Modification\n\n  \n3/80\n\nApplicability: All models 35 with S/Nos. 35-001 to 35-167 and 36 with S/Nos. 36-001 to 36-038, fitted with the 36 inch cabin door.\n\nRequirement: Modify the handle mechanism by installing Gates Learjet Kit No. AMK 78-2.\n\nCompliance: 1. For those aeroplanes which have achieved 3000 hours time in service \\- within 100 hours time in service after 31 March 1980.\n\n2. For those aeroplanes which have not achieved 3000 hours time in service \\- before achieving 3000 hours time in service.\n\nBackground: If the cabin door locking mechanism fails during the door closing operation this fact will not be apparent to the crew and a door “unsafe” condition could exist.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1639},"content_quality":"ok","complexity_score":2,"rejection_reason":"","scope_assessment":{"changed":false,"description":"The directive remains tightly focused on its original purpose: mandating a specific safety modification to address the cabin door locking mechanism defect in identified Learjet aircraft. No expansion beyond the original technical scope is evident."},"complexity_factors":["Single, specific technical requirement (installation of Kit AMK 78-2)","Limited applicability to specific serial number ranges (35-001 to 35-167 and 36-001 to 36-038)","Binary conditional compliance timeframe based on 3,000 hours Time in Service (TIS) threshold","Minimal cross-referencing and no nested exceptions","Short, self-contained document"],"plain_english_summary":"This Airworthiness Directive requires owners of Gates Learjet 35 (S/N 35-001–35-167) and Learjet 36 (S/N 36-001–36-038) fitted with the 36‑inch cabin door to modify the upper cabin door locking mechanism by installing Gates Learjet Kit No. AMK 78‑2.\n\nCompliance is required before reaching 3,000 flight hours (or within 100 flight hours after 31 March 1980 for aircraft already above 3,000 hours). The modification prevents a silent lock failure that can leave the door unsecured in flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-35-12-upper-cabin-door-locking-mechanism-modification","history":"/api/acts/ad-learjet-35-12-upper-cabin-door-locking-mechanism-modification/history","analysis":"/api/acts/ad-learjet-35-12-upper-cabin-door-locking-mechanism-modification/analysis","conflicts":"/api/acts/ad-learjet-35-12-upper-cabin-door-locking-mechanism-modification/conflicts","importantCases":"/api/acts/ad-learjet-35-12-upper-cabin-door-locking-mechanism-modification/important-cases","documents":"/api/acts/ad-learjet-35-12-upper-cabin-door-locking-mechanism-modification/documents"}}