Document ID: chunk:federal_register_of_legislation:F2009L00283:body:0:p2
Version: federal_register_of_legislation:F2009L00283
Segment Type: other
Provision Reference: 
Character Range: 2827–5790

complete clamp (variant with welded screw to its barrel) with a serviceable part in accordance with paragraphs 2.B.1, 2.B.2, 2.B.3.d and 2.B.4 of Eurocopter AS332 ASB No. 30.00.66 revision 2.

                  b) Verify that the hardness of the attachment screw is correct in accordance with paragraphs 2.B.1, 2.B.2 and 2.B.3.c of Eurocopter AS332 ASB No. 30.00.66 revision 2.  In the case of non-conformity, before next flight, comply with Requirement 4 of this AD and thereafter with Requirement 5 and, without exceeding the compliance time limit of Requirement 6, replace parts as stated in Requirement 6a) of this AD.

                7. Do not install a main rotor blade de-icing system distributor retaining clamp or an associated attachment screw on a helicopter, unless its conformity has been established in accordance with the requirements of this AD.

             After accomplishment on a helicopter of Requirement 6 the actions detailed in Requirements 4 and 5 are no longer required for that helicopter.

             Note:  EASA AD 2009-0003R1 dated 13 January 2009 refers.
Compliance:  For Requirement 1 - Remains unchanged as detailed in the original issue of this AD as:

             On helicopters equipped with a main rotor blade de-icing system distributor retaining clamp fitted with an attachment screw that is not welded to the barrel - Within 50 flight hours (FH) or 3 months after 25 June 2008, whichever occurs first, unless previously accomplished.

             On helicopters equipped with a main rotor blade de-icing system distributor retaining clamp fitted with an attachment screw that is welded to the barrel - Within 20 FH or 1 month after 25 June 2008, whichever occurs first, unless previously accomplished.

             For Requirement 2 - Before further flight.

             For Requirement 3 - From the effective date of this AD.

             For Requirement 4 - Within 10 FH after the effective date of this AD.

             For Requirement 5a - At intervals not exceeding 10 FH.

             For Requirement 5b - Each time a main rotor blade de-icing system distributor is installed.

             For Requirement 6 - Within 8 months after the effective date of this AD.

             For Requirement 7 - From the effective date of this AD.
             This Amendment becomes effective on 6 February 2009.
Background:  This AD was issued in response to two cases of failure of the screw that secures the main rotor blade de-icing system distributor retaining clamp.  The examinations carried out on these screws have revealed that these failures were the result of assembly stress in the screw head.

             In addition, in some cases, it was found that the lock-wiring hole was missing from the screw head, making it impossible to ensure additional security using lock-wiring between the screw head and the nut.

             Failure of the clamp attachment screw can lead to damage to the