{"id":"F2006B05756","name":"AD/PA-31/52 - Replacement of Radio Power Relay Cover Spacer Bushings","slug":"ad-pa-31-52-replacement-of-radio-power-relay-cover-spacer-bushings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135609,"registerId":"commonwealth-F2006B05756-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/52 - Replacement of Radio Power Relay Cover Spacer Bushings","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-31 Series Aeroplanes\n\nAD/PA-31/52 Replacement of Radio Power Relay\n\nCover Spacer Bushings\n\n  \n1/77\n\nApplicability: All model PA-31, PA-31-325, and PA-31-350 with S/Nos. 31-7612090, 31-7612091, 31-7612092, 31-7612096, 31-7612098, 31-7612099, 31-7612101 to 31-7612105 incl.\n\n31-7612107 to 31-7612110 incl., and 31-7712002 to 31-7712006 incl. 31-7652142 to\n\n31-7652147 incl. 31-7652149 31-7652151, 31-7652152, 31-7652154 to 31-7652162,\n\nincl. 31-7652164, 31-7652165, 31-7652167, 31-7652168, 31-7652171 to 31-7652174\n\nincl., 3107652176, 31-7752002 to 31-7752007 incl., 31-7752009 to 31-7752011 incl.,\n\n31-7752013, 31-7752014 and 31-7752017 to 31-7752026 incl.\n\nDocument: Piper SB No. 535.\n\nCompliance: Within 10 hours time in service after 18 January 1977.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2102},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical airworthiness directive targeting a specific safety defect in identified aircraft. It has not expanded beyond its original purpose of mandating replacement of specific radio power relay cover spacer bushings."},"complexity_factors":["Extremely narrow applicability limited to specific aircraft serial number ranges","Single, unambiguous compliance action (replacement of specific part)","Simple time-based compliance deadline (10 hours time in service)","Relies on external manufacturer document (Piper Service Bulletin 535) for technical specifications"],"plain_english_summary":"**What this does:** This directive orders owners and operators of specific Piper PA-31 aircraft to replace the spacer bushings on their radio power relay covers.\n\n**Who it affects:** Only applies to specific Piper aeroplane models (PA-31, PA-31-325, and PA-31-350) with the exact serial numbers listed — ranging from 31-7612090 through various ranges up to 31-7752026.\n\n**What must be done:** Aircraft operators must replace the faulty spacer bushings within 10 hours of flight time after 18 January 1977. The technical details for the replacement are found in Piper Service Bulletin No. 535.\n\n**Why it matters:** This prevents potential failures in the aircraft's radio power relay system, which could affect electrical systems or communications equipment."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-52-replacement-of-radio-power-relay-cover-spacer-bushings","history":"/api/acts/ad-pa-31-52-replacement-of-radio-power-relay-cover-spacer-bushings/history","analysis":"/api/acts/ad-pa-31-52-replacement-of-radio-power-relay-cover-spacer-bushings/analysis","conflicts":"/api/acts/ad-pa-31-52-replacement-of-radio-power-relay-cover-spacer-bushings/conflicts","importantCases":"/api/acts/ad-pa-31-52-replacement-of-radio-power-relay-cover-spacer-bushings/important-cases","documents":"/api/acts/ad-pa-31-52-replacement-of-radio-power-relay-cover-spacer-bushings/documents"}}