{"id":"F2010L01752","name":"AD/PT6B/2 - Compressor Rear Hub - Life Limit Review","slug":"ad-pt6b-2-compressor-rear-hub-life-limit-review","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":153122,"registerId":"commonwealth-F2010L01752-current","compilationNumber":null,"startDate":"2026-04-04","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Pratt & Whitney Canada Turbine Engines -","sectionType":"division","heading":"Pratt & Whitney Canada Turbine Engines - PT6B Series","content":"### Pratt & Whitney Canada Turbine Engines \\- PT6B Series\n\n| AD/PT6B/2 | Compressor Rear Hub - Life Limit Review | 13/2010 |\n| --------- | --------------------------------------- | ------- |\n\n| Applicability: | All Pratt and Whitney Canada (P&WC) PT6B-36A, and PT6B-36B series engines.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Unless previously accomplished in accordance with AD/PT6A/33, review and correct the critical part records for Compressor Rear Hub part number (P/N) 3018111 in accordance with P&WC Service Bulletin (SB) PT6B-72-11002 Revision 8, dated 11 June 2003 or later revisions approved by Transport Canada.2. Remove from service any Compressor Rear Hub found, in compliance with Requirement 1, to have exceeded the published life limit contained in P&WCSB PT6B-72-11002 Revision 8, dated 11 June 2003, or later revisions approved by Transport Canada.Note: Transport Canada AD CF-2003-16 refers. |\n| Compliance:    | For Requirement 1: Within 30 days or at the next engine shop visit, whichever is the sooner, from the effective date of this Directive.For Requirement 2: Before further flight. However, in the event that the part cannot be replaced due to the location of the aircraft, the aircraft may be operated to a facility where the part is to be replaced within 25 cycles or 25 flight hours, whichever occurs first, following compliance with Requirement 1.                                                                                                                                              |\n|                | This Airworthiness Directive becomes effective on 9 July 2010.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n| Background:    | AD/PT6A/33 was issued after a review of PW&C SB PT6B-72-11002 found an error in the Flight Count Factor (FAF) criteria used in calculating critical life limits of the Compressor Hub P/N 3018111. One engine was found to have exceeded the life limit using the corrected FAF. This Directive therefore required a review to correct the critical parts record of Compressor Hub’s having P/N 3018111 and to remove them from service if it is calculated that they have exceeded the critical life limit using the amended FAF number.                                                                   |\n\n|     | However, AD/PT6A/33 was published in the Pratt and Whitney Canada Turbine Engines - PT6A series but the applicability was for PT6B engines only. This AD has now been included in the PT6B series to ensure all PT6B engine operators are aware of this AD. |\n| --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)\n\nMike Higgins  \nDelegate of the Civil Aviation Safety Authority\n\n17 June 2010","sortOrder":0},{"sectionNumber":"AD/PT6B/2","sectionType":"part","heading":"AD/PT6B/2","content":"## AD/PT6B/2","sortOrder":1},{"sectionNumber":"Compressor Rear Hub - Life Limit Review","sectionType":"part","heading":"Compressor Rear Hub - Life Limit Review","content":"## Compressor Rear Hub - Life Limit Review","sortOrder":2},{"sectionNumber":"13/2010","sectionType":"part","heading":"13/2010","content":"## 13/2010","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive corrects a publication error by placing the obligation explicitly in the PT6B series rather than the PT6A series. The substantive scope—applicability to PT6B‑36A/B engines and the required review and removal of Compressor Rear Hub P/N 3018111 when life limits are exceeded—remains consistent with the original intent (Background)."},"complexity_factors":["Technical correction to life‑limit calculation (Flight Count Factor) requiring re‑audit of part life records (Background; Requirement 1).","Dependence on a specific service bulletin revision and any later revisions approved by Transport Canada (Requirement 1 reference to SB PT6B‑72‑11002 Rev 8).","Mandatory removal from service of parts that exceed the corrected life limit (Requirement 2), creating immediate replacement costs for operators.","Operational constraint and limited exemption: removal must be before further flight, but a short ferry allowance of up to 25 cycles or 25 flight hours is permitted if replacement cannot be effected on site (Compliance; Requirement 2).","Compliance timing window: record review within 30 days or at next engine shop visit, whichever is sooner (Compliance; Requirement 1).","Applicability covers all PT6B‑36A and PT6B‑36B engines, so the measure affects the entire fleet of those models (Applicability).","Cross‑reference to a prior AD (AD/PT6A/33) and to Transport Canada AD CF‑2003‑16 may require coordination with earlier compliance actions (Background; Note)."],"plain_english_summary":"Requires operators of all Pratt & Whitney Canada PT6B‑36A and PT6B‑36B engines to review and correct records for Compressor Rear Hub P/N 3018111 against P&WC Service Bulletin PT6B‑72‑11002 Rev 8 (or later Transport Canada–approved revisions) and to remove any hubs that have exceeded the corrected life limit. It follows discovery of an error in the Flight Count Factor used to set life limits; compliance deadlines and a limited ferry allowance are specified."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a straightforward administrative correction. The original safety requirement was issued under the wrong engine series designation (PT6A instead of PT6B). This directive simply republishes the same safety requirement in the correct regulatory category to ensure operators of PT6B engines actually see it. The substantive safety requirement remains unchanged from its original intent."},"complexity_factors":["Single, specific mechanical part targeted (P/N 3018111)","Only two substantive requirements with clear sequencing","One conditional exception for ferry flights (25 cycles/hours)","Cross-reference to one external document (Pratt & Whitney Service Bulletin PT6B-72-11002 Rev 8)","Refers to prior directive AD/PT6A/33 for context but doesn't require reading it to comply","No defined terms section — uses standard aviation terminology (cycles, flight hours, part numbers)","Short document (~300 words of substantive content)"],"plain_english_summary":"This mandatory CASA Airworthiness Directive corrects a paperwork/calculation error for the Compressor Rear Hub (P/N 3018111) on Pratt & Whitney Canada PT6B-36A/B engines. It affects operators of helicopters and turboprops using those engines.\n\nOperators must recalculate hub life using the corrected Flight Count Factor within 30 days or at the next service and remove any hub found beyond its corrected limit (with a limited 25-flight/25-hour ferry allowance). The action prevents catastrophic engine failure from over-flown hubs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pt6b-2-compressor-rear-hub-life-limit-review","history":"/api/acts/ad-pt6b-2-compressor-rear-hub-life-limit-review/history","analysis":"/api/acts/ad-pt6b-2-compressor-rear-hub-life-limit-review/analysis","conflicts":"/api/acts/ad-pt6b-2-compressor-rear-hub-life-limit-review/conflicts","importantCases":"/api/acts/ad-pt6b-2-compressor-rear-hub-life-limit-review/important-cases","documents":"/api/acts/ad-pt6b-2-compressor-rear-hub-life-limit-review/documents"}}