{"id":"F2006B09411","name":"AD/ELECT/28 Amdt 3 - Prestolite Alternator SRE Bearing Inspection","slug":"ad-elect-28-amdt-3-prestolite-alternator-sre-bearing-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53779,"registerId":"commonwealth-F2006B09411-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ELECT/28 Amdt 3 - Prestolite Alternator SRE Bearing Inspection","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nElectrical Equipment\n\nAD/ELECT/28\n\nAmdt 3\n\n  \nPrestolite Alternator SRE Bearing Inspection 9/79\n\nApplicability: Prestolite ALV-9400 to ALV-9410 series gear driven alternators.\n\nRequirement: Remove the slip ring and bearing cover by using a small sharp chisel, knife blade, or screwdriver to pry it out of the alternator slip ring head. Care must be taken not to damage the end head or bearing cover. If the bearing cover is damaged during removal it must be replaced.\n\nWithout further disassembly visually inspect the bearing and shaft end for discoloration or any sign of overheating or wear. Pay particular attention to the bearing inner and outer race.\n\nIf there is any sign of overheating or an indication that the rotor shaft has been turning in the inner race or the outer race turning in the end head, the alternator must be removed and repaired.\n\nIf the rotor shaft has been turning in the bearing inner race, the rotor and bearing must be replaced. If the bearing outer race has been turning in the end head, the bearing and end head must be replaced.\n\nCheck the bearing grease for any sign of overheating or contamination such as dirt, or metal filings. If the grease is a dark brown or black colour, or is so contaminated, the alternator must be removed and the bearing replaced.\n\nIf the bearing shows no sign of discoloration, overheating, wear or contamination the bearing only (not the entire cavity) should be regreased with Caltex RPM Grease SRI- 2 only.\n\nNote. The following SBs refer to this inspection: Prestolite ASMIO, Rolls Royce T- 324, Continental TCM M75-30 and FAA AD 76-02-07.\n\nCompliance: Within 100 hours time in service after 30 July 1976 and thereafter at intervals not exceeding 100 hours time in service or 500 hours time in service for alternators modified as per Rex Aviation Modification RA-C-1541.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 3 to an existing Airworthiness Directive originally issued in 1979 (9/79). The scope remains tightly focused on the original safety issue — preventing bearing failure in specific Prestolite alternators. The amendment appears to incorporate the Rex Aviation modification (RA-C-1541) as an alternative compliance path, but this represents a refinement rather than scope creep."},"complexity_factors":["Single discrete mechanical component addressed (one bearing type in one alternator series)","Linear procedural logic with clear decision branches (if damaged → replace; if not → regrease)","No nested definitions or interpretation sections","Limited cross-referencing (only advisory references to related service bulletins in a Note)","Specific but narrow applicability clause (11 model variants in one series)","Prescriptive technical requirements without alternative compliance methods"],"plain_english_summary":"This AD requires owners/operators of Prestolite ALV-9400–ALV-9410 gear‑driven alternators to inspect and maintain the SRE bearing—removing the cover for visual checks, regreasing with specified lubricant if undamaged, and replacing parts if slipping or grinding is found—on a repeating schedule or after a specified modification.  \n\nIt affects aircraft operators and licensed maintenance engineers and aims to prevent alternator bearing failure that could cause complete in‑flight electrical loss."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument is labelled as Amendment 3 but the supplied text itself sets applicability and prescribes inspection, regreasing and replacement rules with specific compliance intervals. No earlier version text is provided here, so a change of scope from prior versions cannot be demonstrated from the supplied material alone."},"complexity_factors":["Narrow applicability: specific to Prestolite ALV‑9400–ALV‑9410 alternator models (reduces scope complexity).","Procedural specificity: stepwise physical inspection and careful slip‑ring cover removal using hand tools (requires technician skill but straightforward).","Conditional outcomes: different replacement actions depending on whether inner race, outer race or end head shows evidence of rotation or overheating.","Material specification: mandates a single grease product (Caltex RPM Grease SRI‑2) for regreasing (limits substitution options).","Compliance timing: historic initial deadline (within 100 hours after 30 July 1976) and two recurrence intervals (100 hours or 500 hours if modified by RA‑C‑1541) which can cause confusion for current records.","Cross-references: refers to service bulletins and an FAA AD (Prestolite ASM10, Rolls Royce T‑324, Continental TCM M75‑30, FAA AD 76‑02‑07) increasing the number of documents to consult.","Repair cascade: some inspection findings force alternator removal and part replacement (cost and downtime implications)."],"plain_english_summary":"This directive requires owners/operators of Prestolite ALV‑9400–ALV‑9410 gear‑driven alternators to inspect slip‑ring bearings for overheating, wear or contamination, then regrease with Caltex RPM Grease SRI‑2 or replace damaged components according to the criteria in the instrument. Compliance is within 100 hours TIS after 30 July 1976 and then every 100 hours (or 500 hours for alternators modified by RA‑C‑1541); owners pay for inspections and replacements and technicians must follow the specified removal and inspection steps."}},"importantCases":[],"_links":{"self":"/api/acts/ad-elect-28-amdt-3-prestolite-alternator-sre-bearing-inspection","history":"/api/acts/ad-elect-28-amdt-3-prestolite-alternator-sre-bearing-inspection/history","analysis":"/api/acts/ad-elect-28-amdt-3-prestolite-alternator-sre-bearing-inspection/analysis","conflicts":"/api/acts/ad-elect-28-amdt-3-prestolite-alternator-sre-bearing-inspection/conflicts","importantCases":"/api/acts/ad-elect-28-amdt-3-prestolite-alternator-sre-bearing-inspection/important-cases","documents":"/api/acts/ad-elect-28-amdt-3-prestolite-alternator-sre-bearing-inspection/documents"}}