{"id":"F2006B05468","name":"AD/PA-23/42 Amdt 1 - Alternator Field Fuse - Installation","slug":"ad-pa-23-42-amdt-1-alternator-field-fuse-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46250,"registerId":"commonwealth-F2006B05468-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-23/42 Amdt 1 - Alternator Field Fuse -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)  \nPiper PA-23 (Apache and Aztec) Series Aeroplanes\n\nAD/PA-23/42\n\nAmdt 1\n\n  \nAlternator Field Fuse \\- Installation 4/79\n\nApplicability: Model PA-23-250 with S/Nos. 27-2505 and subsequent fitted with a voltage regulator selector switch.\n\nRequirement: 1. In aircraft S/No. 27-2505 to 27-3836 and 27-3838 to 27-3943, install a 3 amp fuse in each field circuit between the “F” field terminal on the alternator and the alternator main circuit breaker. (i.e. Cable PF5 and in cable PF 11).\n\n    2. In aircraft S/Nos. 27-3837 and 27-3944 and subsequent, install a 3 amp fuse in each field circuit between the “F” field terminal on the alternator and the voltage regulator selector switch (i.e. cable PF17A and in cable PF18A).\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 as per the manufacturer’s service manual.\n\nCompliance: Forthwith.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2154},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment expands the original 1979 directive to cover additional aircraft serial numbers (27-3944 and subsequent) and specifies different installation requirements for newer aircraft configurations, broadening the safety mandate beyond the originally covered fleet."},"complexity_factors":["Applicability split across three distinct serial number ranges with different installation requirements for each group","Technical aviation terminology and specific cable identifiers (PF5, PF11, PF17A, PF18A) requiring specialized engineering knowledge","Cross-reference to external manufacturer service manuals for functional testing and adjustment procedures"],"plain_english_summary":"This directive mandates a safety modification for certain Piper PA-23-250 (Apache/Aztec) aircraft with a voltage-regulator selector switch: install 3‑amp fuses in the alternator “F” circuits, then test and set the alternator/voltage regulators per the manufacturer’s manual. It affects owners/operators of specified serial-numbered aircraft and must be done forthwith. The fuses need not be pilot‑accessible during flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-42-amdt-1-alternator-field-fuse-installation","history":"/api/acts/ad-pa-23-42-amdt-1-alternator-field-fuse-installation/history","analysis":"/api/acts/ad-pa-23-42-amdt-1-alternator-field-fuse-installation/analysis","conflicts":"/api/acts/ad-pa-23-42-amdt-1-alternator-field-fuse-installation/conflicts","importantCases":"/api/acts/ad-pa-23-42-amdt-1-alternator-field-fuse-installation/important-cases","documents":"/api/acts/ad-pa-23-42-amdt-1-alternator-field-fuse-installation/documents"}}