{"id":"F2006B10845","name":"AD/INST/41 - RAPCO Inline Pressure Filter","slug":"ad-inst-41-rapco-inline-pressure-filter","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56334,"registerId":"commonwealth-F2006B10845-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/INST/41 - RAPCO Inline Pressure Filter","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)  \nInstruments and Automatic Pilots\n\nAD/INST/41 RAPCO Inline Pressure Filter 11/97 TX\n\nApplicability: All RAPCO Inc. filters, P/N RA-1J4-4, RA-1J4-6 and RA-1J4-7 ( Lot number 05597, 07797 and 12597).\n\nNote: RAPCO filters are installed on but not limited to Cessna 310R, T310R, Beech E33A, F33A, V35A, V35B, 36, A36, 58, 65-B80, 70, 95-B55, D55, E55, Piper PA-31- 300, -325, PA-31P, PA-31P-350, PA-31T and PA-34-200T aircraft.\n\nRequirement: Inspect the in-line pressure filter in accordance with FAA Priority Letter Airworthiness Directive 97-16-10 paras A and B dated July 31, 1997.\n\nNote: FAA Priority Letter AD 97-16-10 dated July 31. 1997 refers. Copies may be obtained from the local CASA DO.\n\nCompliance: Unless previously carried out, within 2 days from the effective date.\n\nBackground: The FAA has reported that several RAPCO in-line pressure filter housings that have been produced from the above Lot numbers with applicable P/Ns have cracked in flight. This will cause failure of the aircraft flight instruments and should this occur during IFR flight loss of aircraft control could occur.\n\nInvestigation traced the failure to a manufacturing change introduced to RAPCO Filters P/N RA-1J4-4, RA-1J4-6 and RA-1J4-7, from lot numbers 05597, 07797 and 12597, manufactured in February 1997.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — addressing a specific manufacturing defect in specific RAPCO filter lots. There is no evidence of scope creep; it remains targeted at the identified safety issue without expanding to broader regulatory requirements."},"complexity_factors":["Single, specific technical requirement referencing an external FAA document","Limited applicability: only 3 part numbers across 3 specific lot numbers","No defined terms section or interpretation provisions","Simple conditional logic: compliance required 'unless previously carried out'","No nested exceptions or cross-references to other legislation","Short document (approximately 200 words)"],"plain_english_summary":"This AD orders owners, operators and maintenance organisations of certain Cessna, Beechcraft and Piper aircraft to urgently inspect RAPCO inline fuel pressure filters (specific part/lot IDs) after reports of filter housings cracking in flight, which can cause flight-instrument failure.\n\nThe inspection follows FAA procedures and must be done within 2 days of the directive. It’s urgent because cracked filters can lead to instrument loss during instrument flight and potential loss of control."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive applies only to the specified RAPCO part numbers and lot numbers and requires inspection per the FAA Priority Letter. This matches the instrument's stated safety-driven purpose and does not expand scope beyond those identified parts and installations."},"complexity_factors":["Cross-reference to FAA Priority Letter AD 97-16-10 paras A and B — procedural steps are external to this instrument","Multiple affected part numbers and three specific lot numbers narrow technical applicability","Wide list of aircraft types where the filters may be installed increases operational reach","Very short compliance window (2 days) creates urgent logistical and administrative burden for operators","Safety-critical consequence (instrument failure/loss of control) raises enforcement priority but not legal complexity"],"plain_english_summary":"This Airworthiness Directive orders inspection, within 2 days, of specified RAPCO inline pressure filters (P/N RA-1J4-4, RA-1J4-6, RA-1J4-7; lot numbers 05597, 07797, 12597) installed on a range of light aircraft, following FAA Priority Letter AD 97-16-10 paras A and B. The FAA found some housings cracked after a manufacturing change; cracking can cause flight instrument failure and possible loss of control. The rule imposes immediate inspection and any corrective action on aircraft operators."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-inst-41-rapco-inline-pressure-filter","history":"/api/acts/ad-inst-41-rapco-inline-pressure-filter/history","analysis":"/api/acts/ad-inst-41-rapco-inline-pressure-filter/analysis","conflicts":"/api/acts/ad-inst-41-rapco-inline-pressure-filter/conflicts","importantCases":"/api/acts/ad-inst-41-rapco-inline-pressure-filter/important-cases","documents":"/api/acts/ad-inst-41-rapco-inline-pressure-filter/documents"}}