{"id":"F2006B05513","name":"AD/PA-23/86 - Ammeter Cable Clamp - Inspection and Replacement","slug":"ad-pa-23-86-ammeter-cable-clamp-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46369,"registerId":"commonwealth-F2006B05513-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-23/86 - Ammeter Cable Clamp - Inspection and Replacement","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\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)  Piper PA-23 (Apache and Aztec) Series Aeroplanes\n\n \n\n# AD/PA-23/86 Ammeter Cable Clamp - Inspection\n\nand Replacement\n\nApplicability: All model PA-23 all serial numbers.\n\n# 3/93\n\n \n\nRequirement: 1. Inspect the clamp securing the cable which connects the battery to the ammeter.\n\n \n\n2.     If the clamp is metal and does not have a cushion insulation lining, remove the clamp and inspect the cable for damage.\n\n \n\n3.     If the cable is damaged, repair or replace the cable as required.\n\n \n\n4.     Secure the cable to the aircraft tubular structure using a cushioned (insulated) type clamp meeting Specification MS-21919 as detailed in FAA-AC 43.13-1A. Ensure clamps are correctly sized to secure the cable firmly and that the cable is aligned so that it passes centrally through the clamp axis.\n\n \n\n5.     Ensure cables are free from rubbing by the co-pilots control column.\n\n \n\n6.     If existing clamps have insulation liners, ensure that these are undamaged. Compliance:              Within 25 hours time in service after 4 Mar 1993.\n\nBackground:  An investigation into a Piper PA-23 aircraft fire, conducted by BASI, revealed that the cable connecting the ammeter to the battery had melted coincident where it passed through a metal supporting clamp. This caused a fire behind the instrument panel and resulted in cabin and fuselage destruction. Inspection also indicated that poor routing of the ammeter cable had allowed the co-pilots control column to rub against the cable.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1802},"content_quality":"ok","complexity_score":2,"rejection_reason":"","scope_assessment":{"changed":false,"description":"The directive remains tightly focused on the original safety issue identified in the BASI investigation—preventing electrical fires caused by uninsulated ammeter cable clamps on PA-23 aircraft. The amendment (3/93) appears to maintain this narrow scope without expansion into unrelated systems."},"complexity_factors":["Extremely narrow scope (single aircraft series, single component)","Linear 6-step procedure without nested conditions or exceptions","Single external technical reference (Specification MS-21919)","Clear, unconditional compliance deadline (25 hours time in service)","No defined terms section or interpretive provisions"],"plain_english_summary":"This is a mandatory safety directive for Piper PA‑23 Apache and Aztec owners to fix a fire hazard from the battery‑to‑ammeter cable: bare metal clamps and poor routing can overheat or be chafed by the co‑pilot’s control column, causing in‑flight fires. Owners must inspect and, within 25 flight hours of 4 Mar 1993, repair/replace damaged cable, fit cushioned clamps (MS‑21919), and secure/reroute the cable so it cannot be rubbed. Noncompliance grounds the aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-86-ammeter-cable-clamp-inspection-and-replacement","history":"/api/acts/ad-pa-23-86-ammeter-cable-clamp-inspection-and-replacement/history","analysis":"/api/acts/ad-pa-23-86-ammeter-cable-clamp-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-pa-23-86-ammeter-cable-clamp-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-pa-23-86-ammeter-cable-clamp-inspection-and-replacement/important-cases","documents":"/api/acts/ad-pa-23-86-ammeter-cable-clamp-inspection-and-replacement/documents"}}