{"id":"F2010L01751","name":"AD/PT6B/1 - Gas Generator Case","slug":"ad-pt6b-1-gas-generator-case","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":153119,"registerId":"commonwealth-F2010L01751-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/1 | Gas Generator Case | 13/2010 |\n| --------- | ------------------ | ------- |\n\n| Applicability: | All PT6B-36 and -36A engine models not incorporating:(a) gas generator case P/N 3112048-01 identified by P&WC SB 11041, or(b) superseding parts incorporating the intent of SB 11041, or(c) stiffening plates P/N 3102444-01.                                                                                                                                                                                                       |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Unless previously accomplished, inspect the gas generator case for seam weld cracking in accordance with Part 2A of the Accomplishment Instructions of P&WC SB 11031R1 or later revision.2. Repair all seam weld cracking in accordance with Part 2B of the Accomplishment Instructions of P&WC SB 11031R1 or later revision. This repair constitutes terminating action of this AD.Note: Transport Canada AD CF-88-01R1 refers. |\n| Compliance:    | 1. Prior to gas generator cases accumulating 1200 hours time in service since new or within the next 100 hours time in service from the effective date of this AD, whichever occurs last. Thereafter at intervals not exceeding 600 hours time in service.2. Prior to further flight.                                                                                                                                               |\n|                | This Airworthiness Directive becomes effective on 9 July 2010.                                                                                                                                                                                                                                                                                                                                                                      |\n| Background:    | A number of gas generator case longitudinal seam welds have been found cracked. An undetected weld seam crack could lead to the rupture of the pressure vessel and a subsequent unsafe condition. This AD requires dye penetrant inspection of the gas generator case longitudinal seam and repair if found cracked. This AD is issued as a result of an audit of Transport Canada ADs.                                             |\n\n![](image.001.png)\n\nMike Higgins  \nDelegate of the Civil Aviation Safety Authority\n\n22 June 2010","sortOrder":0},{"sectionNumber":"AD/PT6B/1","sectionType":"part","heading":"AD/PT6B/1","content":"## AD/PT6B/1","sortOrder":1},{"sectionNumber":"Gas Generator Case","sectionType":"part","heading":"Gas Generator Case","content":"## Gas Generator Case","sortOrder":2},{"sectionNumber":"13/2010","sectionType":"part","heading":"13/2010","content":"## 13/2010","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":"The AD retains a narrow safety remit: inspect and repair longitudinal seam weld cracking on PT6B-36 and -36A gas generator cases unless excluded by specified part numbers or modifications. It does not expand to other engine models or other defect types; compliance is tied to the P&WC service bulletin referenced in the instrument (Applicability; Requirement; Compliance)."},"complexity_factors":["Applicability exclusions reference specific part numbers and a separate SB (P&WC SB 11041) requiring operators to confirm whether an engine is in or out of scope (Applicability).","Mandatory inspection and repair actions are defined by an external document (P&WC SB 11031R1), creating dependency on that SB's content and any future revisions (Requirement).","Compliance schedule uses a hybrid trigger (prior to 1200 hours since new or within 100 hours of the AD, whichever occurs last) and a repeating interval (every 600 hours), increasing record‑keeping precision (Compliance).","Repair is a terminating action but must be accomplished 'prior to further flight', imposing immediate operational cost when cracks are found (Requirement / Compliance).","The AD cross‑refers a Transport Canada AD and results from an audit, indicating alignment with foreign airworthiness directives but adding administrative traceability (Background / Note).","Technical inspection method specified (dye penetrant) requires appropriate tooling and trained personnel, creating a modest maintenance burden."],"plain_english_summary":"**What it does:** Requires owners/operators of PT6B-36 and -36A engines (unless fitted with the excluded parts) to carry out dye‑penetrant inspections of the gas‑generator case longitudinal seam weld and to repair any cracks in accordance with Pratt & Whitney Canada Service Bulletin SB 11031R1 (or later). Initial inspection timing is before 1200 hours TIS or within 100 hours of the AD (whichever is later), then every 600 hours; repairs must be completed before further flight.\n\nWho pays and who decides: operators pay for inspections and repairs; the Civil Aviation Safety Authority enforces the inspection schedule and accepts the SB as the compliance method."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific safety defect in specific engine models. It has not expanded beyond its initial purpose of mandating inspection and repair of gas generator case seam welds."},"complexity_factors":["Single, specific mechanical issue (gas generator case cracking)","Clear applicability criteria with three exclusion conditions","Two-part requirement (inspect, then repair if needed)","Time-based compliance with 'whichever occurs last' logic","References external technical documents (P&WC SB 11031R1, Transport Canada AD)","No nested definitions or extensive interpretation sections","Straightforward terminating action (repair ends the obligation)"],"plain_english_summary":"This AD requires owners/operators of helicopters with Pratt & Whitney Canada PT6B-36 and PT6B-36A engines to inspect the gas generator case welds for cracks, repair any cracks before further flight, and perform recurring inspections on a set schedule. It excludes engines already fitted with the upgraded case or reinforcement. Issued after multiple crack discoveries, the directive addresses the risk of pressure-vessel rupture and potential engine loss."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pt6b-1-gas-generator-case","history":"/api/acts/ad-pt6b-1-gas-generator-case/history","analysis":"/api/acts/ad-pt6b-1-gas-generator-case/analysis","conflicts":"/api/acts/ad-pt6b-1-gas-generator-case/conflicts","importantCases":"/api/acts/ad-pt6b-1-gas-generator-case/important-cases","documents":"/api/acts/ad-pt6b-1-gas-generator-case/documents"}}