{"id":"F2006B08252","name":"AD/CESSNA 337/7 - Alternator Field Fuse - Installation","slug":"ad-cessna-337-7-alternator-field-fuse-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115552,"registerId":"commonwealth-F2006B08252-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 337/7 - Alternator Field Fuse - Installation","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)  \nCessna 337 Series Aeroplanes\n\nAD/CESSNA 337/7 Alternator Field Fuse \\- Installation 3/71\n\nApplicability: All models.\n\nRequirement: 1. In aircraft S/N 337-0576 to 337-0978 install a 3 amp fuse in each field circuit between the “F” field terminal on the alternator and the master switch.\n\n(i.e. Cable K-PB81 and in cable K-PB64).\n\n    2. In aircraft S/N 337-0979 and subsequent install a 3 amp fuse in each field circuit between the “F” field terminal on the alternator and the alternator switch.\n\n(i.e. Cable K-PB81 and in cable K-PB64).\n\nNote: It is not necessary for these fuses to be accessible in flight.\n\n    3. Functionally check the alternator system and the adjustment of the voltage regulators in accordance with the manufacturer's service manual.\n\nCompliance: Within 200 hours time in service after 31 May 1971.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2515},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This appears to be the original 1971 airworthiness directive maintaining its original scope of mandating fuse installation in Cessna 337 alternator field circuits to address electrical safety issues."},"complexity_factors":["Specific serial number breakpoints (0576-0978 vs 0979+) requiring different installation locations","Technical aviation terminology (field circuits, alternator terminals, voltage regulators)","Cross-reference to manufacturer's service manual for testing procedures","Time-in-service compliance calculation rather than calendar date"],"plain_english_summary":"**What this does:** This is a mandatory safety instruction for owners of Cessna 337 aircraft (twin-engine planes with a distinctive twin-tail design).\n\n**The fix:** Install small 3 amp fuses in the wiring that controls the alternators (the generators that keep the battery charged).\n- For older aircraft (serial numbers 0576–0978): Install fuses between the alternator and the master power switch.\n- For newer aircraft (serial numbers 0979 onwards): Install fuses between the alternator and the alternator switch.\n\n**Additional requirement:** Test the charging system and adjust the voltage controls to ensure they're working within safe limits, following the aircraft maker's manual.\n\n**Who must comply:** Anyone operating these aircraft.\n\n**Deadline:** This had to be completed within 200 flight hours after 31 May 1971.\n\n**Why it matters:** Without these fuses, electrical faults in the alternator control wiring could cause fires or total electrical failure during flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-337-7-alternator-field-fuse-installation","history":"/api/acts/ad-cessna-337-7-alternator-field-fuse-installation/history","analysis":"/api/acts/ad-cessna-337-7-alternator-field-fuse-installation/analysis","conflicts":"/api/acts/ad-cessna-337-7-alternator-field-fuse-installation/conflicts","importantCases":"/api/acts/ad-cessna-337-7-alternator-field-fuse-installation/important-cases","documents":"/api/acts/ad-cessna-337-7-alternator-field-fuse-installation/documents"}}