EASA AD No.: 2010-0147-E

EASA Form 111 Page 1/2 

## EASA EMERGENCY AIRWORTHINESS DIRECTIVE

AD No.: 2010-0147-E

Date: 14 July 2010

Note: This Emergency Airworthiness Directive (AD) i s issued by EASA, acting in accordance with Regulation (EC) No 216/2008 on behalf of the E uropean Community, its Member States and of the European third countries that participat e in the activities of EASA under Article 66 of that Regulation. This AD is issued in accordance with EC 1702/2003, Part 21A.3B. In accordance with EC 2042/2003 Annex I, Part M.A.301, the continuing airworthiness of an aircraft shall be en sured by accomplishing any applicable ADs. Conseque ntly, no person may operate an aircraft to which an AD applies, except in accor dance with the requirements of that AD, unless othe rwise specified by the Agency [EC 2042/2003 Annex I, Part M.A.303] or agreed with the Authority of the State of Registry [EC 216/200 8, Article 14(4) exemption]. 

### Type Approval Holder’s Name:

EUROCOPTER Type/Model designation(s): SA 330 helicopters

TCDS Number: EASA.R.002

Foreign AD: Not applicable

Revision: None



### ATA 65 Rotors – Main Gear Box Oil Cooling Fan - Inspection / Repl acement

Manufacturer(s): Eurocopter (formerly Eurocopter France)

Applicability: SA 330 J helicopters, all serial num bers.

Reason: EUROCOPTER has been informed of a case of r otor burst of the Main Gear Box (MGB) oil cooling fan assembly. The investigation has shown that some fan rotor bla des interfered with the upper area of the guide vane bearing housing of the fan. The blades detached from the rotor, impacting then the MGB compartment environment and causing puncture holes in the transmission deck. Th is interference was due to internal degradation of the bearings of the fan rot or shaft. This last condition, if not corrected, could lead t o fan rotor burst and possibly result to damage hydraulic pipes and flight control s located nearby the MGB cooling fan. For the reasons stated above, this AD requires an i nspection of the play between a fan blade and the guide vane bearing hous ing. Furthermore, it also requires the necessary replacement of the two beari ngs of the fan rotor shaft, depending on findings.

Effective Date: 16 July 2010.EASA AD No.: 2010-0147-E

EASA Form 111 Page 2/2 Required Action(s) and Compliance Time(s): Required as indicated, unless accomplished previous ly:
(1) Within 10 Flight Hours (FH) after the effective date of this AD, and thereafter at intervals not exceeding 10 FH, measur e with a feeler gauge at the bottom of the fan guide vane bearing, the pl ay between a fan blade and the upper section of the guide vane bearing hou sing of the fan in accordance with the instructions of paragraph 3.B.2 . of Eurocopter SA 330 Alert Service Bulletin (ASB) No. 05.96.
(2) If the play measured over the entire width of t he fan blade is lower than 0.2 mm, before next flight, replace the two bearing s of the fan rotor shaft with serviceable ones in accordance with the instru ctions of paragraph 3.B.2.b) of Eurocopter SA 330 ASB No. 05.96.
(3) The replacement of the two fan rotor shaft bear ings as required by paragraph (2) of this AD does not constitute a term inating action for the repetitive inspections required by paragraph (1) of this AD.

Ref. Publications: Eurocopter SA 330 Alert Service Bulletin No. 05.96 dated 12 July 2010. The use of later approved revisions of these docume nts is acceptable for compliance with the requirements of this AD.

Remarks: 1. If requested and appropriately substantiated, EA SA can approve Alternative Methods of Compliance for this AD.
2. The safety assessment has requested not to imple ment the full consultation process and an immediate publication and notificati on. 3. Enquiries regarding this AD should be referred t o the Airworthiness Directives, Safety Management & Research Section, C ertification Directorate, EASA. E-mail ADs@easa.europa.eu

. 4. For any question concerning the technical conten t of the requirements in this AD, please contact: EUROCOPTER (STDI) – Aéropo rt de Marseille Provence 13725 Marignane Cedex, France telephone +33 (4) 12 85 97 97, facsimile +33 (4) 42 85 99 66 E-mail: Directive.technical-support@eurocopter.com

.