{"id":"F2008L00387","name":"AD/S-PUMA/73 - OEI Training Flights/Main Gear Box Freewheel Shaft","slug":"ad-s-puma-73-oei-training-flights-main-gear-box-freewheel-shaft","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119019,"registerId":"commonwealth-F2008L00387-current","compilationNumber":null,"startDate":"2026-04-03","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/73 | OEI Training Flights/MainGear Box Freewheel Shaft | 3/2008 |\n| ------------ | ------------------------------------------------- | ------ |\n\n```html\n

Applicability:

EUROCOPTER AS332 L2 helicopters, with Main Gear Box (MGB) main reduction gear modules equipped with freewheel shafts part number (P/N) 332A32-2190-25 as listed below:

Freewheel shaft serial number (S/N)

installed on: main module P/N & S/N

M1608

332A32-3011-03M / M2062

M945

M1078

332A32-3011-03M / M2088

M1087

M1272

332A32-3011-03M / M2104

M1273

M1688

332A32-3011-03M / M2016

M974

M1231

332A32-3011-03M / M2079

M937

M1115

332A32-3011-03M / M4001

M635

M1159

332A32-3011-03M / M4004

M907

M1124

332A32-3011-01M / M2044

M486

\n```\n\n```html\n

Requirement:

1. For aircraft with MGB main reduction gear modules equipped with freewheel shafts as listed in “Applicability” section above, and unless Requirements 2, 3 or 4 of this AD is accomplished as applicable:

a) One-Engine-Inoperative (OEI) / Engine failure training is prohibited. Insert a copy of this AD in the Limitations section of the Flight Manual.

b) If an engine in-flight shut down occurs, comply with the instructions given in Para 2.B.2 of EUROCOPTER AS332 Alert Service Bulletin (ASB) No. 01.00.74 original issue or later NAA approved revisions.

2. Replace MGB main reduction gear modules equipped with freewheel shafts
P/N 332A32-2190-25 as listed below, in accordance with the instructions given in Para 2.B.2 of ASB No. 01.00.74 original issue or later NAA approved revisions.

Freewheel shaft: S/N

installed on: main module P/N & S/N

M1231

332A32-3011-03M / M2079

M937

M1115

332A32-3011-03M / M4001

M635

M1159

332A32-3011-03M / M4004

M907

M1124

332A32-3011-01M / M2044

M486

3. Replace MGB main reduction gear modules equipped with freewheel shafts P/N 332A32-2190-25 as listed below, in accordance with the instructions given in paragraph 2.B.2 of ASB No. 01.00.74 original issue or later NAA approved revisions.

\n```\n\n```html\n

Freewheel shaft: S/N

installed on: main module P/N & S/N

M1608

332A32-3011-03M / M2062

M945

M1078

332A32-3011-03M / M2088

M1087

M1272

332A32-3011-03M / M2104

M1273

M1688

332A32-3011-03M / M2016

M974

4. Do not install MGB main reduction gear modules fitted with freewheel shafts as listed in the applicability section of this AD on a helicopter, without having ensured that the freewheel shafts of the main reduction gear module has been inspected by an approved repair station.

Note: EASA Emergency Airworthiness Directive No 2007-0312-E dated
21 December 2007 refers.

Compliance:

1. a) and b) Before further flight, after the effective date of this AD.

2. Within 40 Flight Hours (FH) after the effective date of this AD and at the latest by 31 May 2008.

3. Within 200 Flight Hours (FH) after the effective date of this AD and at the latest by 30 June 2008.

4. After the effective date of this AD

This Airworthiness Directive becomes effective on 13 March 2008.

Background:

This AD is issued following a hard landing which occurred recently while conducting in-flight OEI/engine failure training. During a RH single-engine approach with idle rating training mode activated on the LH engine, the flight crew encountered a sudden loss of drive on the RH side of the MGB.

\n```\n\n| | MGB examinations revealed the failure of the RH freewheel due to excessive wear on some of its components. In case of freewheel malfunction on one of the two MGB inputs, the resulting overtorque at the remaining MGB input, given OEI mode activation, may not be transmitted by the second freewheel if the latter too is severely worn.The analysis of the various recordings made during overhauls and supplied by various repair stations identified a list of offending MGB main reduction gear modules and freewheel shafts that are currently in service.Consequently, this AD prohibits OEI/engine failure training with rotorcraft on which MGB main reduction gear modules equipped with freewheel shafts as listed in the “Applicability” section above and mandates their replacement. |\n| --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n14 January 2008","sortOrder":0},{"sectionNumber":"AD/S-PUMA/73","sectionType":"part","heading":"AD/S-PUMA/73","content":"## AD/S-PUMA/73","sortOrder":1},{"sectionNumber":"OEI Training Flights/Main Gear Box Freew","sectionType":"part","heading":"OEI Training Flights/Main Gear Box Freewheel Shaft","content":"## OEI Training Flights/Main \nGear Box Freewheel Shaft","sortOrder":2},{"sectionNumber":"3/2008","sectionType":"part","heading":"3/2008","content":"## 3/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The AD confines action to identified freewheel shaft serial numbers and their fitted MGB modules and prescribes prohibition of OEI training, replacement, or inspection per EUROCOPTER ASB para 2.B.2. It addresses the specific failure mode reported and does not expand the remedial scope beyond the listed parts and operational restrictions."},"complexity_factors":["Applicability narrows to a long list of specific freewheel shaft serial numbers and associated main module P/N & S/N — increases operator record checks and part-tracing burden.","Multiple conditional requirements and alternatives (Requirements 1–4) create decision points for operators about whether to ground, inspect, replace, or prohibit training.","Cross-reference to EUROCOPTER ASB No. 01.00.74 paragraph 2.B.2 for the technical procedure — requires locating and following a separate manufacturer document (compliance dependency).","Staged compliance deadlines with different urgency levels (before further flight for Flight Manual insertion; within 40 FH by 31 May 2008; within 200 FH by 30 June 2008) — scheduling and resource pressure.","Operational constraint: immediate prohibition of OEI/engine‑failure training and mandatory Flight Manual amendment (Requirement 1(a)) — direct effect on training programmes and crew currency.","Inspection/install restriction requiring an approved repair station to inspect freewheel shafts before installation (Requirement 4) — creates demand for certified maintenance capacity and potential downtime.","Technical replacement of MGB modules (Requirements 2–3) likely requires lead time for parts, certified repair resources and potential aircraft out‑of‑service periods.","Safety-critical nature (Background: hard landing from freewheel failure / overtorque) increases administrative oversight and possible conservatism in interpretation by regulators/operators.","Reference to EASA Emergency AD No 2007-0312-E — coordination with foreign regulator actions can add procedural complexity for multinational operators.","Record-keeping and evidence obligations (inserting AD into Flight Manual; demonstrating compliance with ASB and repair-station inspection) add administrative compliance costs."],"plain_english_summary":"This Airworthiness Directive prohibits one‑engine‑inoperative (OEI)/engine‑failure training and requires replacement or inspection of main gearbox (MGB) main reduction gear modules fitted with specific freewheel shafts listed by serial number. It applies to Eurocopter AS332 L2 helicopters identified in the Applicability. Operators must follow Eurocopter ASB No. 01.00.74 para 2.B.2 for replacement/inspection within set flight‑hour deadlines and insert the AD into the Flight Manual. The AD was issued after a hard landing linked to excessive freewheel wear."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is a standard emergency airworthiness directive issued in response to a specific safety incident. The scope remains tightly focused on the identified mechanical defect in specific helicopter components. There is no indication of scope creep beyond the original safety purpose."},"complexity_factors":["Multiple compliance deadlines with alternative time limits (flight hours OR calendar dates)","Four distinct requirement pathways with conditional logic (Requirements 1-4 with 'unless' clauses)","Extensive serial number specificity — 16 individual freewheel shaft serial numbers matched to 9 main module part/serial number combinations across two separate tables","Cross-reference to external technical document (Eurocopter ASB No. 01.00.74) for implementation instructions","Nested applicability criteria: aircraft type → specific gearbox module → specific part number → specific serial numbers","Reference to foreign aviation authority (EASA Emergency AD 2007-0312-E) in notes"],"plain_english_summary":"This CASA Airworthiness Directive orders operators of certain Eurocopter AS332 L2 Super Puma helicopters to stop one‑engine‑inoperative (OEI) training immediately and to have specified main gearbox freewheel shafts inspected and replaced as required. It affects helicopters with listed gearbox module serials and aims to eliminate excess freewheel‑shaft wear that could cause loss of rotor drive after an engine failure, preventing potentially catastrophic outcomes."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-puma-73-oei-training-flights-main-gear-box-freewheel-shaft","history":"/api/acts/ad-s-puma-73-oei-training-flights-main-gear-box-freewheel-shaft/history","analysis":"/api/acts/ad-s-puma-73-oei-training-flights-main-gear-box-freewheel-shaft/analysis","conflicts":"/api/acts/ad-s-puma-73-oei-training-flights-main-gear-box-freewheel-shaft/conflicts","importantCases":"/api/acts/ad-s-puma-73-oei-training-flights-main-gear-box-freewheel-shaft/important-cases","documents":"/api/acts/ad-s-puma-73-oei-training-flights-main-gear-box-freewheel-shaft/documents"}}