{"id":"F2006B05578","name":"AD/PA-25/41 - Engine Air Filter","slug":"ad-pa-25-41-engine-air-filter","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46598,"registerId":"commonwealth-F2006B05578-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.","sortOrder":0},{"sectionNumber":"AD/PA-25/41 Engine Air Filter 8/2000","sectionType":"part","heading":"AD/PA-25/41 Engine Air Filter 8/2000","content":"# AD/PA-25/41 Engine Air Filter 8/2000\n\nApplicability: Model PA-25, PA-25-235 and PA-25-260, all serial numbers, equipped with Puralator (FACET) air filter P/No 638873, Model CA161PL or Piper P/N 460-632\n\n(PS60007-2).\n\nNote 1: Filters of concern can be identified by accessing the filter and locating the brand name and part number. Filters of concern are branded “FACET 638873” in 0.250”(1/4”) high white characters with no date code.\n\nRequirement: 1. Inspect applicable air filters in accordance with Piper Service Bulletin No 1022 and/or Puralator Service Bulletin No SB090298.01.\n\n2. Replace applicable air filters with an approved air filter.\n\nReplacing the air filter with an approved filter other than a Puralator (FACET) P/N 638873 filter constitutes a terminating action for the requirements of this Directive.\n\nNote 2: FAA AD 99-26-05 Amdt 39-11464 refers.\n\nCompliance: 1. Unless previously accomplished; at next inspection of the engine air inlet filter element or within 25 hours time in service from the effective date of this Directive, whichever occurs first. Thereafter, re-inspect at intervals not to exceed 25 hours time in service.\n\n    2. Installed filters: At next periodic inspection or within 12 months time in service from the effect date of this Directive, whichever occurs first.\n\n    3. Spare filters: Prior to installation in a engine.\n\nThis Airworthiness Directive becomes effective on 10 August 2000.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD’s scope matches its stated corrective purpose: it targets a specific air filter part on identified PA‑25 models and prescribes inspection and replacement measures. There is no indication in the text that the directive broadens beyond that safety focus or alters affected aircraft classes or parts beyond the named filter and models."},"complexity_factors":["Narrow applicability limited to specific Piper PA‑25 variants and a single filter part number (FACET P/N 638873), which simplifies scope.","Identification requirement: filter must be removed/inspected to confirm brand and part number (branding detail: “FACET 638873” in 0.250\" white characters).","Mandated compliance intervals differ by status: in‑service element (25 hours/inspection), installed filters (within 12 months), and spares (prior to installation), creating multiple timing streams.","Accepts terminating action (replacement with approved non‑FACET filter), which alters ongoing compliance obligations.","References external service bulletins (Piper SB No 1022 and Puralator SB SB090298.01) for inspection instructions, adding dependency on third‑party documents.","Cross‑reference to FAA AD 99‑26‑05 introduces potential need to reconcile international directives.","Administrative enforcement via CASA delegate under CAR 1998 subregulation 39.1(1) — limited discretion but regulatory force."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Piper PA-25, PA-25-235 and PA-25-260 aircraft fitted with Puralator (FACET) air filter P/N 638873 to inspect those filters and replace them with an approved filter if necessary. It sets short re‑inspection intervals and a deadline for replacing installed and spare filters; replacing the specified FACET filter with an approved alternative ends the AD’s requirements. Who pays: the aircraft owner/operator. Who enforces the rule: the CASA delegate under CAR subregulation 39.1(1)."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard single-issue airworthiness directive focused specifically on engine air filter safety for particular Piper aircraft models. The scope remains tightly constrained to the identified unsafe condition without expansion into broader operational or maintenance requirements."},"complexity_factors":["Multiple compliance pathways with different timeframes (25 hours vs 12 months vs 'prior to installation')","Cross-reference to two manufacturer service bulletins and one FAA Airworthiness Directive","Specific part number identification requirements including visual inspection criteria (0.250\" white characters, no date code)","Conditional terminating action (replacement with non-Puralator filter ends obligations)","Applicability limited to specific aircraft models and serial number ranges"],"plain_english_summary":"This CASA safety order requires owners/operators of Piper PA-25, PA-25‑235 and PA-25‑260 aircraft to inspect and, if necessary, replace Puralator (FACET) air filters marked “FACET 638873” (Piper P/N 460‑632) because they lack a date code and may be unsafe. The directive mandates inspecting/removing the identified filters and fitting approved alternatives to prevent engine contamination and possible failure; once an approved replacement is fitted no further action under the order is needed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-41-engine-air-filter","history":"/api/acts/ad-pa-25-41-engine-air-filter/history","analysis":"/api/acts/ad-pa-25-41-engine-air-filter/analysis","conflicts":"/api/acts/ad-pa-25-41-engine-air-filter/conflicts","importantCases":"/api/acts/ad-pa-25-41-engine-air-filter/important-cases","documents":"/api/acts/ad-pa-25-41-engine-air-filter/documents"}}