Document ID: chunk:federal_register_of_legislation:F2006L03944:body:0:p1
Version: federal_register_of_legislation:F2006L03944
Segment Type: other
Provision Reference: 
Character Range: 0–3085

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:

                A helicopter operated in areas with high solar radiation temperatures above
                40 degrees centigrade.
Requirement:       1. A MRH fitted with frequency adapters pre MOD 0762C39 and operated in hot climatic conditions and/or in tropical and damp atmosphere:

                   Modify the frequency adapters and frequency adapter bushes per MOD 0762C39, in accordance with paragraphs 2.B.1, 2.B.2 and 2.B.3 of AS 365 ASB
                   No. 62.00.24 and SA 365 ASB No. 65.45, as applicable.

                   2. A MRH fitted with frequency adapters post MOD 0762C39:

                   Check that the lockwire is in place and that the holes in the frequency adapters and in the frequency adapter bushes are not blocked, in accordance with paragraph 2.B.6 of AS 365 ASB No. 62.00.24 and SA 365 ASB No. 65.45, as applicable.
                   If the lockwire is in place on the trailing edge of the frequency adapter and if the four holes are not blocked, flights may be resumed.

                   If the lockwire is not in place, before further flight, re-position the bush if it has turned, and fit the lockwire.

                   If