AD/DAUPHIN/89 - Main Rotor Head Frequency Adapters (Cth)

AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 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.

Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters AD/DAUPHIN/89 Main Rotor Head Frequency Adapters 2/2007 TX

Applicability: Model SA 365 N, SA 365 N1, AS 365 N2, AS 365 N3, SA 365 C, SA 365 C1, SA 365 C2, and SA 365 C3 helicopters, all serial numbers, if a main rotor head (MRH) fitted with frequency adapters and frequency adapter bushes is installed, as referenced below:

- pre MOD 0762C39 and used in hot climatic conditions and/or tropical and damp atmosphere, or

- post Mod 0762C39.

The part numbers of the affected frequency adapters and frequency adapter bushes are listed in paragraph 2.B.2.v and paragraph 2.B.5 of Eurocopter AS 365 Alert Service Bulletin (ASB) No. 62.00.24 and SA 365 ASB No. 65.45, as applicable.

Note 1: The use of a helicopter in tropical and damp atmosphere is defined as follows:

A helicopter operated in climatic conditions with outside air temperatures from 28 degrees centigrade upward combined with relative humidity from 75% upward.

Note 2: The use of a helicopter in hot climatic conditions is defined as follows: