{"id":"F2009L00471","name":"AD/PC-12/54 - Fuselage Overboard Vent Installation","slug":"ad-pc-12-54-fuselage-overboard-vent-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":77036,"registerId":"commonwealth-F2009L00471-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Pilatus PC-12 Series Aeroplanes","sectionType":"division","heading":"Pilatus PC-12 Series Aeroplanes","content":"### Pilatus PC-12 Series Aeroplanes\n\n| AD/PC-12/54 | Fuselage Overboard Vent Installation | 3/2009 |\n| ----------- | ------------------------------------ | ------ |\n\n| Applicability: | Model PC-12 and PC-12/45 aircraft, manufacturer serial numbers 101 through 320 inclusive.                                                                                                                                                                                                                                                                                                                                        |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Install an overboard vent for the airfoil deice system pressure regulator in accordance with the Accomplishment Instructions of Pilatus PC-12 Service Bulletin No. 30-011 original issue, or later EASA approved revision.Note: EASA AS 2009-0007 refers.                                                                                                                                                                        |\n| Compliance:    | Within 3 months after 12 March 2009, unless already accomplished.                                                                                                                                                                                                                                                                                                                                                                |\n|                | This Airworthiness Directive becomes effective on 12 March 2009.                                                                                                                                                                                                                                                                                                                                                                 |\n| Background:    | Reports were received of several occurrences where the Deice Pressure Regulator has vented excess hot air into the forward compartment, damaging the Oxygen Cylinder on/off cable, the Ram-Air Scoop cable, and the Environmental Control System firewall shut-off valve cable. This Directive requires the installation of a flange and scoop in the aircraft skin to vent hot air from the Deice Pressure Regulator overboard. |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n19 January 2009","sortOrder":0},{"sectionNumber":"AD/PC-12/54","sectionType":"part","heading":"AD/PC-12/54","content":"## AD/PC-12/54","sortOrder":1},{"sectionNumber":"Fuselage Overboard Vent Installation","sectionType":"part","heading":"Fuselage Overboard Vent Installation","content":"## Fuselage Overboard Vent Installation","sortOrder":2},{"sectionNumber":"3/2009","sectionType":"part","heading":"3/2009","content":"## 3/2009","sortOrder":3}],"analysis":{"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":"Scope remains focused on specified PC‑12 and PC‑12/45 serial numbers (101–320) and requires the installation of an overboard vent per the Pilatus Service Bulletin or later EASA‑approved revision (Applicability; Requirement). Allowing later EASA‑approved revisions governs acceptable methods but does not broaden aircraft applicability or extend the stated compliance obligation."},"complexity_factors":["Narrow applicability to specific serial numbers (Applicability) — limits affected population but requires individual owner action.","Prescriptive technical method mandated (Requirement: Pilatus Service Bulletin No. 30‑011 or later EASA‑approved revision) — reduces operator discretion but creates dependency on the specified procedure.","Short fixed compliance timeframe (Compliance: within 3 months after 12 March 2009) — increases scheduling and logistical pressure for maintenance providers and operators.","Safety‑critical nature (Background: damage to oxygen, ram‑air scoop and ECS cables) — raises urgency and potential for regulatory enforcement.","Regulatory coordination (Requirement references EASA approval) — links acceptable compliance to external regulator approvals, introducing an approval dependency.","Resource and parts availability risk — operators must source parts and maintenance capacity within the compliance window.","Limited administrative discretion — CASA Delegate issued the AD (signature line), so enforcement and acceptance of compliance evidence rests with the regulator."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Pilatus PC‑12 and PC‑12/45 aircraft (manufacturer serial numbers 101–320 inclusive) to install an overboard vent for the airfoil deice system pressure regulator, using Pilatus Service Bulletin No. 30‑011 or a later EASA‑approved revision, within three months of 12 March 2009. It responds to incidents where excess hot air venting damaged cables in the forward compartment; owners/operators pay for parts and installation and must schedule the mandated modification to retain airworthiness."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a defined aircraft population. The scope remains precisely limited to the fuselage vent installation as originally intended."},"complexity_factors":["Single, specific mechanical modification required","Only one defined applicability criterion (serial number range)","Single cross-reference to manufacturer service bulletin","Simple compliance deadline (3 months from effective date)","No nested exceptions, conditional logic, or alternative compliance methods","Background explanation is straightforward and narrative","Total length is approximately 200 words of substantive content"],"plain_english_summary":"Owners/operators of Pilatus PC‑12 and PC‑12/45 aircraft (S/N 101–320) must install an external vent to route hot de‑icing air outside the fuselage. \n\nThe AD corrects inward venting that has damaged control and environmental systems; the modification is mandatory to eliminate the safety risk and restore compliant airframe ventilation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-12-54-fuselage-overboard-vent-installation","history":"/api/acts/ad-pc-12-54-fuselage-overboard-vent-installation/history","analysis":"/api/acts/ad-pc-12-54-fuselage-overboard-vent-installation/analysis","conflicts":"/api/acts/ad-pc-12-54-fuselage-overboard-vent-installation/conflicts","importantCases":"/api/acts/ad-pc-12-54-fuselage-overboard-vent-installation/important-cases","documents":"/api/acts/ad-pc-12-54-fuselage-overboard-vent-installation/documents"}}