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## EASA EMERGENCY AIRWORTHINESS DIRECTIVE

AD No.: 2007- 0312-E

Date: 21 December 2007

No person may operate an aircraft to which an Airworthiness Directive applies, except in accordance with the requirements of that Airworthiness Directive unless otherwise agreed with the Authority of the State of Registry. 

### Type Approval Holder’s Name:

EUROCOPTER Type/Model designation(s):

AS332 L2 helicopters

TCDS Number: EASA. R.002.

Foreign AD: Not applicable

Supersedure: None.



### ATA 63 Limitations – Main Gear Box, Freewheel Shaft – OEI Training Flights Prohibition / Replacement

Manufacturer(s): EUROCOPTER (formerly EUROCOPTER France).

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

Freewheel shaft: S/N installed on: main module P/N & S/N M1608 M945 332A32-3011-03M / M2062

M1078 M1087 332A32-3011-03M / M2088

M1272 M1273 332A32-3011-03M / M2104

M1688 M974 332A32-3011-03M / M2016

M1231 M937 332A32-3011-03M / M2079

M1115 M635 332A32-3011-03M / M4001

M1159 M907 332A32-3011-03M / M4004

M1124 M486 332A32-3011-01M / M20442 of 3 Reason: This Emergency Airworthiness Directive (EAD) is issued following a hard landing which occurred recently while making in-flight engine failure training, i.e. One Engine Inoperative (OEI) 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. 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 the various repair stations allowed to identify a list of offending MGB main reduction gear modules and freewheel shafts that are currently in service.

Consequently, this EAD prohibits engine failure One Engine Inoperative (OEI) training with rotorcraft on which MGB main reduction gear modules equipped with freewheel shaf ts as listed in § “Applicability” above and mandates their replacement.

Effective Date: 25 December 2007

Compliance: (1) For aircraft with MGB main reduction gear modules equipped with freewheel shafts as listed in § “Applicability” above, after the effective date of this AD and unless §§ (2), (3) or (4) of this EAD is accomplished as applicable:

(a) engine failure OEI training is prohibited and before the next flight, insert a copy of this EAD in the Limitations section the Flight Manual.

(b) if an engine in-flight shut do wn occurs, comply before the next flight with the instructions given in paragraph 2.B.2 of EUROCOPTER AS332 Alert Service Bulletin (ASB) No. 01.00.742.

(2) Within 40 Flight Hours (FH) after the effective date of this AD and at the latest by December 31, 2007, 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 the ASB referenced below:

Freewheel shaft: S/N installed on: main module P/N & S/N M1231 M937 332A32-3011-03M / M2079

M1115 M635 332A32-3011-03M / M4001

M1159 M907 332A32-3011-03M / M4004

M1124 M486 332A32-3011-01M / M20443 of 3 (3) Within 200 Flight Hours (FH) after the effective date of this AD and at the latest by January 31, 2008, 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 the ASB referenced below:

Freewheel shaft: S/N installed on: main module P/N & S/N M1608 M945 332A32-3011-03M / M2062

M1078 M1087 332A32-3011-03M / M2088

M1272 M1273 332A32-3011-03M / M2104

M1688 M974 332A32-3011-03M / M2016

(4) After the effective date of this AD, no person shall install MGB main reduction gear modules fitted with freewheel shafts as listed in § “Applicability” above on a helicopter, without having ensured that the freewheel shafts of the main reduction gear module has been inspected by an approved repair station.

Ref. Publications: EUROCOPTER AS332 Alert Service Bulletin No. 01.00.74 initial issue

The use of a later approved revision of this document is acceptable for compliance with the requirements of this AD.

Remarks: 1. If requested and appropriately substantiate, EASA can accept Alternative Methods of Compliance for this AD.

2. The safety assessment has requ ested not to implement the full consultation process and an immediate publication and notification

3. Enquiries regarding this AD should be addressed to Focal Point Certification Directorate, EASA, E-mail: Ads@easa.europa.eu

4. For any questions concerning the technical content of the requirements in this AD, please contact: EUROCOPTER (STDI) – Aéroport de Marseille Provence 13725 Marignane Cedex- France. Tel: +33 (4) 12 85 97 97 – Fax: +33 (4) 85 99 66 E-mail: Directive.technical-support@eurocopter.com