{"id":"F2006B06073","name":"AD/PC-12/10 - Fuel Storage - Vent Valve System","slug":"ad-pc-12-10-fuel-storage-vent-valve-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114471,"registerId":"commonwealth-F2006B06073-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-12/10 - Fuel Storage - Vent Valve System","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)  \nPilatus PC-12 Series Aeroplanes\n\nAD/PC-12/10 Fuel Storage \\- Vent Valve System 8/98 DM\n\nApplicability: Model PC-12 and PC-12/45 airplanes serial numbers 101 \\- 230 (incl).\n\nRequirement: Modify the fuel storage vent valve system by removing the inward vent valves and installing float valves and flame arrestors in accordance with the requirements of Pilatus Service Bulletin No.28-005 dated 04 May 1998. This Directive supersedes the requirements of AD/PC-12/9 Amdt 1 dated 4 December 1997 which will be cancelled.\n\nNote: FOCA AD HB 98-126 dated 15 May 1998 refers.\n\nCompliance: Within 60 days of the effective date of this AD.\n\nThis airworthiness directive becomes effective on 27 May 1998.\n\nBackground: Reports of abnormal automatic engagement of the fuel booster pumps during normal aircraft operations revealed that under certain circumstances the inward vent valves could fail shut. In this condition, operation of the boost pumps could cause permanent damage to the wing skin structure. Interim measures introduced under AD/PC-12/9 have since been found to be ineffective and a full modification of the fuel storage vent system has now been introduced. This Directive mandates the incorporation of the vent system modification and advises cancellation of AD/PC- 12/9 Amdt 1 dated 04 December 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 mechanical defect in a specific aircraft type's fuel vent system. It replaces an earlier interim directive with a permanent solution, but does not expand beyond the original safety purpose."},"complexity_factors":["Single, discrete technical modification with clear manufacturer reference (Pilatus Service Bulletin No.28-005)","Limited applicability (specific aircraft model and serial number range: 101-230)","Simple compliance deadline (60 days from effective date)","No nested exceptions, conditional logic, or extensive cross-referencing","Only one defined term implicitly referenced (the Service Bulletin)","Straightforward background explanation without technical subsections"],"plain_english_summary":"Owners and operators of Pilatus PC‑12 airplanes (serial numbers 101–230) must modify the fuel tank venting system per the manufacturer’s service bulletin: remove inward vent valves and install float valves with flame arrestors. \n\nThis mandatory AD, which supersedes the earlier temporary fix, addresses a risk that the old valves could jam, allowing pressure buildup and permanent wing damage; compliance is required within 60 days of 27 May 1998."},"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":true,"description":"The AD replaces the earlier interim requirements (AD/PC-12/9 Amdt 1) with a mandatory design modification of the vent system. It narrows the regulatory response from interim operational measures to a required hardware change for PC-12/PC-12/45 serials 101–230 and imposes a 60-day compliance deadline. The change is grounded in reported inward-vent-valve failures that could cause booster-pump-induced wing skin damage."},"complexity_factors":["Technical modification requiring specific parts (float valves and flame arrestors) and compliance with an external service bulletin (Pilatus SB No.28-005)","Applicability limited to a serial-number range (PC-12 and PC-12/45 serials 101–230)","Short mandatory compliance window (60 days) creating scheduling and downtime pressures for operators","Supersedes a prior interim AD (AD/PC-12/9 Amdt 1), so operators must transition from temporary measures to a permanent design change","Safety-critical context — risk of structural damage if unmodified, so enforcement and inspection are likely to be strict"],"plain_english_summary":"This directive requires owners/operators of Pilatus PC-12 and PC-12/45 aeroplanes (serials 101–230) to modify the fuel storage vent system: remove inward vent valves and install float valves with flame arrestors per Pilatus Service Bulletin No.28-005. Compliance is mandatory within 60 days and the AD took effect 27 May 1998.\n\nThe regulator says the change responds to reports that inward vent valves could fail shut, allowing booster-pump operation to damage wing skin. Owners/operators bear the cost and downtime; the AD replaces an earlier interim measure (AD/PC-12/9 Amdt 1)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-12-10-fuel-storage-vent-valve-system","history":"/api/acts/ad-pc-12-10-fuel-storage-vent-valve-system/history","analysis":"/api/acts/ad-pc-12-10-fuel-storage-vent-valve-system/analysis","conflicts":"/api/acts/ad-pc-12-10-fuel-storage-vent-valve-system/conflicts","importantCases":"/api/acts/ad-pc-12-10-fuel-storage-vent-valve-system/important-cases","documents":"/api/acts/ad-pc-12-10-fuel-storage-vent-valve-system/documents"}}