1 of 3 

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 / M2044 
 2 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 shafts 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 down 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 / M2044 
 3 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 requested 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