{"id":"F2006L03942","name":"AD/S-PUMA/67 - Main Gearbox Casing","slug":"ad-s-puma-67-main-gearbox-casing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":60889,"registerId":"commonwealth-F2006L03942-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter AS 332 (Super Puma) Series He","sectionType":"division","heading":"Eurocopter AS 332 (Super Puma) Series Helicopters","content":"### Eurocopter AS 332 (Super Puma) Series Helicopters\n\n| AD/S-PUMA/67 | Main Gearbox Casing | 2/2007 TX |\n| ------------ | ------------------- | --------- |\n\n| Applicability: | AS 332 C, AS 332 C1, AS 332 L and AS 332 L1 helicopters, all serial numbers, if averaging more than 4 torque variation cycles per flight hour.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | 1. Ensure that there is no crack by visually checking for absence of oil leaks on the MGB main casing RH face, in accordance with the instructions given in paragraph 2.B of Eurocopter AS 332 Alert Service Bulletin (ASB) No. 05.00.66.2. Analysis of the results:a. If there is no oil leak, resume flights in accordance with the instructions specified in paragraph 2.B.2.a of AS 332 ASB No. 05.00.66 or later DGAC approved revision.b. If an oil leak is found, before further flight, replace the MGB in accordance with the instructions specified in paragraph 2.B.2.b of AS 332 ASB No. 05.00.66 or later DGAC approved revision.Replacement of the MGB does not constitute terminating action for the repetitive inspection requirements of this AD.Note: EASA Emergency AD 2006-0361-E dated 30 November 2006 refers. |\n| Compliance:    | Within the next 20 flight hours (FH) or 400 torque cycles, whichever occurs first after the effective date of this directive, and thereafter at intervals not exceeding 110 FH or 2,200 torque cycles, whichever occurs first.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n|                | This Airworthiness Directive becomes effective on 4 December 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n\n| Background: | This AD is issued following a crack which was discovered in one of the inner ribs of the main casing during major overhaul of a main gearbox (MGB) at EUROCOPTER. The MGB concerned was installed on a helicopter specifically used for “heli-logging” missions involving frequent torque variations. In the event of intensive operation of the helicopter, the crack can grow and lead to an MGB oil leak and thus give rise to an emergency situation affecting flight safety. |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n1 December 2006","sortOrder":0},{"sectionNumber":"AD/S-PUMA/67","sectionType":"part","heading":"AD/S-PUMA/67","content":"## AD/S-PUMA/67","sortOrder":1},{"sectionNumber":"Main Gearbox Casing","sectionType":"part","heading":"Main Gearbox Casing","content":"## Main Gearbox Casing","sortOrder":2},{"sectionNumber":"2/2007 TX","sectionType":"part","heading":"2/2007 TX","content":"## 2/2007 TX","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":4,"scope_assessment":{"changed":false,"description":"The AD applies narrowly to AS 332 C/C1/L/L1 helicopters under high torque‑variation use and prescribes inspections and conditional replacement per the manufacturer ASB; it does not broaden applicability beyond the specified types or add unrelated obligations. The AD preserves ongoing inspection requirements after replacement (Requirement; Compliance)."},"complexity_factors":["Conditional applicability tied to an operational metric (\"averaging more than 4 torque variation cycles per flight hour\") creates monitoring and record‑keeping burden (Applicability).","Inspections are visual and must follow manufacturer Alert Service Bulletin procedures, so practical compliance depends on following external ASB instructions and any later DGAC‑approved revisions (Requirement).","Dual measurement thresholds (flight hours or torque cycles) and differing initial and recurrent intervals require operators to track two separate usage metrics (Compliance).","Replacement of the MGB is required if a leak is found but does NOT terminate the repetitive inspections, adding recurring cost and logistics (Requirement).","Reference to other authorities (EASA Emergency AD and DGAC approval) introduces interjurisdictional coordination and potential updates to procedures outside the AD text (Requirement; Note)."],"plain_english_summary":"This Airworthiness Directive requires operators of Eurocopter AS 332 C, C1, L and L1 helicopters that average more than 4 torque‑variation cycles per flight hour to perform a visual check of the main gearbox (MGB) right‑hand casing for oil leaks and to replace the MGB before further flight if a leak is found (Applicability; Requirement). Compliance is time‑limited (initial within 20 FH or 400 torque cycles, then recurring up to 110 FH or 2,200 torque cycles) and is intended to detect cracks that could lead to oil leaks and in‑flight emergencies (Compliance; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical defect discovered during maintenance. It applies precisely to the identified risk (main gearbox casing cracks in high-torque-cycle operations) without expanding into broader operational or regulatory matters."},"complexity_factors":["Short, single-purpose directive with one primary requirement","Only 4 defined applicability criteria (helicopter models + operational threshold)","Simple conditional logic: oil leak present vs. absent","Cross-reference to external technical document (Eurocopter ASB 05.00.66) for detailed procedures","Dual-unit compliance calculation (flight hours OR torque cycles — whichever occurs first)","No nested exceptions or complex definitional sections"],"plain_english_summary":"CASA mandates visual inspections of the main gearbox casing for oil leaks on Eurocopter AS 332 C/C1/L/L1 helicopters used in high torque‑variation operations (typically >4 torque cycles/hour, e.g., heli‑logging). Initial inspection is required within 20 flight hours or 400 torque cycles, then every 110 hours or 2,200 cycles.\n\nAny detected leak means grounding and replacing the entire main gearbox before flight; inspections remain mandatory thereafter to catch crack growth and prevent catastrophic gearbox failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-puma-67-main-gearbox-casing","history":"/api/acts/ad-s-puma-67-main-gearbox-casing/history","analysis":"/api/acts/ad-s-puma-67-main-gearbox-casing/analysis","conflicts":"/api/acts/ad-s-puma-67-main-gearbox-casing/conflicts","importantCases":"/api/acts/ad-s-puma-67-main-gearbox-casing/important-cases","documents":"/api/acts/ad-s-puma-67-main-gearbox-casing/documents"}}