{"id":"F2006B07107","name":"AD/S-PUMA/30 Amdt 2 - Tail Rotor Gearbox (TGB) Angular Play Check","slug":"ad-s-puma-30-amdt-2-tail-rotor-gearbox-tgb-angular-play-check","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48896,"registerId":"commonwealth-F2006B07107-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/S-PUMA/30 Amdt 2 - Tail Rotor Gearbox (TGB) Angular Play Check","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)  \n![](image.002.png)  \nEurocopter AS 332 (Super Puma) Series Helicopters\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/S-PUMA/30 Amdt 1 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nAD/S-PUMA/30\n\nAmdt 2\n\n  \n\nTail Rotor Gearbox (TGB) Angular Play Check\n\n  \n9/2001\n\nApplicability: All Eurocopter AS 332 versions C, C1, L, and L1 helicopters fitted with TGB Part Number (P/N) 332A33-0001, all dash numbers.\n\nRequirement: 1. Check the angular play of the TGB in accordance with the instructions contained in paragraph 2B of Eurocopter AS332 Alert Service Bulletin No. 05.00.44, Revision 1.\n\n    2. If the play measurement found during compliance with Requirement 1 of this Directive is greater than 0.44mm and less than 0.75mm, comply with the instructions of paragraph 2B(2) or paragraph 2B(3) of ASB No. 05.00.44, Revision 1.\n\n    3. If the play measurement found during compliance with Requirement 1 of this Directive is equal to or greater than 0.75mm, remove and replace the TGB as per MET work card No. 64.20.00.401.\n\nNote: DGAC AD 1997-322-067 (A) R2 dated 21 February 2001 refers.\n\nCompliance: 1. (a) For TGBs that have been in service for more than 495 hours since new, or since last overhaul:\n\nUnless previously accomplished, within 25 hours time in service (TIS) of the effective date of this Directive (original issue) and thereafter at intervals of no more than 520 flying hours.\n\n(b) For TGBs that have been in service for less than 495 hours since new or since last overhaul:\n\nAt 520 flying hours since new or last overhaul and thereafter at intervals of no more than 520 flying hours.\n\n(d) For spare gearboxes that have operated more than 495 flight hours since new or last overhaul:\n\nAt or prior to installation on an aircraft and thereafter at intervals of no more than 520 flying hours following installation.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n    2. At 100 flying hour intervals.\n\n    3. Prior to further flight.\n\nThis Amendment becomes effective on 6 September 2001.\n\nBackground: The measures in this Directive resulted from investigation into an accident involving a SA330, which lost drive to the tail rotor due to worn splines on the bevel wheel and on the tail rotor drive shaft.\n\nThis Amendment updates the reference SB revision status, revises the wear limits and compliance intervals.\n\nAmendment 1 clarified the applicability and compliance requirements. Amendment 1 of this Airworthiness Directive became effective on 20 May 1999.\n\n![](image.003.png)The original issue of this Airworthiness Directive became effective on 6 November 1997.\n\n![](image.004.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 26 July 2001\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 15 August 2001.","sortOrder":0}],"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":5,"scope_assessment":{"changed":true,"description":"Yes. Amendment 2 updates the referenced service bulletin revision and revises the wear limits and compliance intervals; Amendment 1 had earlier clarified applicability and compliance. Those changes alter the inspection thresholds and timing compared with the original AD, shifting operators' inspection schedules and the point at which gearbox replacement is required (see Background; Requirement; Compliance)."},"complexity_factors":["Dependence on external technical documents (Eurocopter AS332 Alert Service Bulletin No. 05.00.44 Rev 1 and MET work card No. 64.20.00.401) to define measurement method and corrective steps — Requirement 1 and 3.","Multiple numeric wear thresholds that trigger different actions: >0.44mm & <0.75mm versus ≥0.75mm — Requirement 2 and 3.","Layered compliance timings tied to service hours since new/overhaul (distinction at 495 hours) and recurring intervals (initial 25 hours TIS for some, 520‑hour recurring interval) — Compliance 1(a),(b),(d).","Separate rule for spare gearboxes (inspection at or before installation) and recurrent checks after installation — Compliance 1(d).","Immediate safety actions in some cases ('Prior to further flight') add operational urgency and potential grounding/downtime — Compliance 3.","Amendment history that alters wear limits and intervals and that previously clarified applicability — Background (Amendment notes), which complicates tracking the current obligations versus earlier versions.","Precision and measurement technique requirements increase technical inspection burden and may produce borderline measurement disputes between operators and regulators — implicit in Requirement 1 referencing ASB measurement instructions.","Formatting/numbering in the published text (scattered numbered lines) may cause interpretive friction for implementers and auditors."],"plain_english_summary":"This Airworthiness Directive requires operators of Eurocopter AS332 (Super Puma) helicopters fitted with Tail Gearbox P/N 332A33-0001 to perform periodic angular‑play checks of the tail‑rotor gearbox and to follow specified corrective steps — including repair or removal and replacement — when measured play exceeds set limits. CASA issued the AD following an investigation of a tail‑rotor drive loss and it references Eurocopter Alert Service Bulletin No. 05.00.44 Rev 1 and a MET work card for the required procedures. Operators pay for inspections, maintenance and any gearbox replacements and must schedule recurrent checks to comply."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment stays within the original scope of ensuring tail rotor gearbox safety. It updates technical references and refines wear limits and compliance intervals based on operational experience, but does not expand beyond the original safety purpose of preventing tail rotor drive failures."},"complexity_factors":["Multiple compliance pathways based on hours of service (new vs. overhauled vs. spare gearboxes)","Nested conditional requirements (different actions based on measured wear levels: <0.44mm, 0.44-0.75mm, ≥0.75mm)","Cross-references to external technical documents (Eurocopter Alert Service Bulletin No. 05.00.44, MET work card No. 64.20.00.401, French DGAC AD 1997-322-067)","Four distinct compliance schedules depending on service history and installation status","Technical aviation terminology requiring specialized knowledge (TGB, angular play, time in service, dash numbers)"],"plain_english_summary":"This is a safety directive for specific Eurocopter Super Puma helicopters. It requires regular checks of the tail rotor gearbox (TGB) - a critical component that helps control the helicopter's direction. The directive mandates measuring 'angular play' (looseness or wobble) in the gearbox. If wear is moderate, specific maintenance steps must be followed. If wear is severe, the gearbox must be replaced immediately. The checks must happen every 520 flying hours for most gearboxes, or every 100 hours if certain wear thresholds are detected. This rule replaces an earlier version and tightens safety requirements following a fatal accident where a helicopter lost tail rotor control due to worn parts."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-puma-30-amdt-2-tail-rotor-gearbox-tgb-angular-play-check","history":"/api/acts/ad-s-puma-30-amdt-2-tail-rotor-gearbox-tgb-angular-play-check/history","analysis":"/api/acts/ad-s-puma-30-amdt-2-tail-rotor-gearbox-tgb-angular-play-check/analysis","conflicts":"/api/acts/ad-s-puma-30-amdt-2-tail-rotor-gearbox-tgb-angular-play-check/conflicts","importantCases":"/api/acts/ad-s-puma-30-amdt-2-tail-rotor-gearbox-tgb-angular-play-check/important-cases","documents":"/api/acts/ad-s-puma-30-amdt-2-tail-rotor-gearbox-tgb-angular-play-check/documents"}}