Document ID: chunk:federal_register_of_legislation:F2009L00676:body:0:p1
Version: federal_register_of_legislation:F2009L00676
Segment Type: other
Provision Reference: 
Character Range: 0–3139

AIRWORTHINESS DIRECTIVE
On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/AS 355/98 and issues the following 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 AS 355 (Twin Ecureuil) Series Helicopters
AD/AS 355/98 Amdt 1  Stabiliser Upper and Lower Fin Attachment Fitting - Modification  4/2009 DM

Applicability:  Model AS 355 E, F, F1, F2 and N helicopters, all serial numbers, fitted with the following upper and lower fins to which Modification (MOD) 073330 has not been incorporated:

                Upper fin assembly part number 355A14-0522-00XX, -01XX, -02XX, -03XX, -13XX, -14XX and -15XX.

                Lower fin assembly part number 355A14-0521-00XX, -01XX, -02XX and -03XX.
Requirement:    Required as indicated, unless already accomplished.

                   1. For helicopters with upper and lower fins pre MOD 073288:

                     a. For helicopters which have accumulated less than 110 flight hours after 31 August 2006:

                     Within 110 flight hours after 31 August 2006, replace the upper and lower fin attachment screws in accordance with the instructions specified in paragraph 2.B.2 of EUROCOPTER AS 355 Alert Service Bulletin (ASB) No.55.00.11 Revision 2 (MOD 073288), or later EASA approved revision.

                     b. For helicopters which have accumulated more than 110 flight hours after 31 August 2006:

                     Within 15 flight hours after 26 February 2009, replace the upper and lower fin attachment screws in accordance with the instructions specified in paragraph 2.B.2 of ASB No. 55.00.11 Revision 2 (MOD 073288), or later EASA approved revision.

                     c. At intervals not to exceed 110 flight hours, check the tightening torque of the upper fin attachment screws and check the upper fin reinforcement splice for cracks and loosened rivets in accordance with the instructions specified in paragraph 2.B.3 of ASB No. 55.00.11 Revision 2, or later EASA approved revision.

                     d. In the case of cracks, loosened rivets in the reinforcement splice or if the tightening torque of one or both of the attachment screws is less than 80% of the minimum torque value, before further flight, apply the associated corrective actions in accordance with the instructions of paragraph 2.B.3.a.1, 2.B.3.a.2 or 2.B.3.a.3 (as applicable), of ASB No. 55.00.11 Revision 2, or later EASA approved revision.

                   2. For helicopters with upper and lower fins post MOD 073288:

                     a. For helicopters which