{"id":"F2006B06105","name":"AD/PC-12/42 - Passenger Oxygen System Pipes","slug":"ad-pc-12-42-passenger-oxygen-system-pipes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46852,"registerId":"commonwealth-F2006B06105-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\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 CASR 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.\n\n![](image.001.png)  \n\nPilatus PC-12 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/PC-12/42 Passenger Oxygen System Pipe","sectionType":"part","heading":"AD/PC-12/42 Passenger Oxygen System Pipes 8/2004","content":"# AD/PC-12/42 Passenger Oxygen System Pipes 8/2004\n\nApplicability: Model PC-12 and PC-12/45 aeroplanes with the following Manufacturer Serial Numbers (MSN), fitted with an executive interior and a six, seven or eight-seat oxygen system installed:\n\n| 124          | 417 thru 424 | 441          | 492          |\n| ------------ | ------------ | ------------ | ------------ |\n| 166          | 427          | 443 thru 444 | 494 thru 496 |\n| 401          | 429 thru 430 | 446 thru 465 | 498 thru 516 |\n| 405          | 432 thru 433 | 468 thru 470 | 518 thru 522 |\n| 407          | 435 thru 437 | 472 thru 475 | 524          |\n| 411 thru 414 | 439          | 478 thru 490 |              |\n\nRequirement: Accomplish the following, as applicable to each aircraft configuration, in accordance with Pilatus PC-12 Service Bulletin 35-004 dated 19 December 2003:\n\n    Remove and discard the forward oxygen pipe part number (P/N) 535.21.12.076 and install new forward oxygen pipe P/N 535.21.12.125.\n\n    2. Carry out the following inspections:\n\n    Inspect the overhead panel for damage. If damage is found; contact PILATUS for repair procedures.\n\n    b. Inspect the interior-lighting power-supply units for damage.\n\n    c. For aeroplanes with the eight-seat oxygen system installed; inspect the aft oxygen pipe P/N 535.21.12.054 for damage.\n\n    3. Carry out the following Modifications:\n\n    For aeroplanes with the TCAS antenna and the eight-seat oxygen system installed; modify the TCAS antenna cable routing in accordance with paragraph (3) (E) and (Fig. 2) of SB No. 35-004.\n\n    b. For aeroplanes with the eight-seat oxygen system installed; modify the attachment of the aft oxygen pipe routing in accordance with paragraph (3)\n\n(F) and (Fig. 1) of SB No. 35-004.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD enforces the corrective actions described in Pilatus Service Bulletin 35‑004 for the specifically listed MSNs and configurations. It does not expand applicability beyond those aircraft or add new types of corrective measures in the supplied text; it mandates operator compliance with the manufacturer’s procedures and OEM repair routing where damage is found (Applicability; Requirement; Service Bulletin reference)."},"complexity_factors":["Narrow applicability but long serial‑number list — implementers must check aircraft MSN against the Applicability table to know if the AD applies (Applicability).","Multiple conditional actions — required tasks differ by cabin/oxygen configuration and presence of TCAS antenna, so operators must determine exact aircraft configuration before acting (Requirement paras 2–3).","Parts‑specific replacement — mandatory replacement of forward oxygen pipe P/N 535.21.12.076 with P/N 535.21.12.125; aft pipe inspection references P/N 535.21.12.054 (Requirement ¶1 and ¶2.c).","Dependency on manufacturer service bulletin — all work must be done “in accordance with Pilatus PC‑12 Service Bulletin 35‑004 dated 19 December 2003,” so technical detail and method come from the SB rather than the AD text (Requirement header).","OEM involvement for repairs — if inspection finds damage the AD requires contacting Pilatus for repair procedures, which may add coordination and scheduling complexity (Requirement ¶2.a).","Interfaces with avionics/structure — TCAS antenna cable routing and aft‑pipe attachment modifications involve avionics and structural routing changes, requiring skilled maintenance and possible re‑certification records (Requirement ¶3 and Figure references).","Compliance timing not present in supplied text — the AD preamble references a compliance section but the timing/details are not included here, requiring operators to retrieve the full AD/SB to confirm deadlines and intervals (preamble + Requirement)."],"plain_english_summary":"This Airworthiness Directive orders owners/operators of certain Pilatus PC‑12 and PC‑12/45 aeroplanes (listed MSNs) with executive interiors and six‑, seven‑ or eight‑seat passenger oxygen systems to replace a specified forward oxygen pipe, perform targeted inspections of the overhead panel, interior‑lighting power supplies and (for eight‑seat systems) an aft oxygen pipe, and modify oxygen/TCAS cable routing where applicable. Work must be done in accordance with Pilatus Service Bulletin 35‑004; operators pay for compliance and must follow OEM repair procedures if damage is found."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: addressing a specific unsafe condition in passenger oxygen system pipes for particular PC-12 aircraft configurations. The serial number list and configuration-specific requirements align with the original safety purpose."},"complexity_factors":["Multiple applicability conditions: must cross-reference Manufacturer Serial Numbers (MSN) against a 24-entry table, plus interior type and oxygen system configuration","Conditional requirements based on aircraft configuration: different actions required for six/seven-seat vs eight-seat oxygen systems","Specific part number references (P/N 535.21.12.076 and P/N 535.21.12.125) requiring technical documentation cross-reference","Mandatory external document reference: compliance requires obtaining and following Pilatus Service Bulletin 35-004 (not reproduced in the AD)","Nested conditional logic: TCAS antenna modification only applies to subset of already-filtered group (eight-seat system + TCAS antenna present)"],"plain_english_summary":"This AD requires owners/operators of specified Pilatus PC-12 aircraft with executive interiors and six‑, seven‑ or eight‑seat oxygen systems to replace a defective forward oxygen pipe, inspect overhead panels/lighting power units (and aft oxygen pipe where applicable), and modify TCAS cable/pipe routing on affected aircraft.\n\nIt matters because the existing forward oxygen pipe can fail, risking passenger oxygen delivery in emergencies; compliance follows Pilatus Service Bulletin 35‑004."},"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-pc-12-42-passenger-oxygen-system-pipes","history":"/api/acts/ad-pc-12-42-passenger-oxygen-system-pipes/history","analysis":"/api/acts/ad-pc-12-42-passenger-oxygen-system-pipes/analysis","conflicts":"/api/acts/ad-pc-12-42-passenger-oxygen-system-pipes/conflicts","importantCases":"/api/acts/ad-pc-12-42-passenger-oxygen-system-pipes/important-cases","documents":"/api/acts/ad-pc-12-42-passenger-oxygen-system-pipes/documents"}}