AD/EC 135/20 - Main Transmission Mast Bearing Retainer Bolts (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 EC 135 Series Helicopters AD/EC 135/20 Main Transmission Mast Bearing Retainer Bolts 12/2008 TX

Applicability: Eurocopter Deutschland GmbH (ECD) EC 135 P1(CDS), EC 135 P1(CPDS), EC 135 P2(CPDS), EC 135 P2+, EC 135 T1(CDS), EC 135 T1(CPDS), EC 135 T2(CPDS) and EC 135 T2+ helicopters. Requirement: 1. Inspect the attachment hardware and install locking washers in accordance with Section 3.B of ECD Alert Service Bulletin (ASB) No. EC135-63A-013 Revision 02.

2. Unless accomplished as required by Requirement 1 of this AD, inspect the attachment hardware and install locking washers in accordance with Section 3.B of ECD ASB No. EC135-63A-013 Revision 02.

3. For helicopters that have already been modified, prior to the effective date of this AD, in accordance with ECD ASB No. EC135-63A-013 at original issue or Revision 01; inspect the attachment hardware and install locking washers in accordance with Section 3.B of ECD ASB No. EC135-63A-013 Revision 02.

4. Do not install a main transmission on a helicopter, unless it has been modified in accordance with Section 3.B of ECD ASB No. EC135-63A-013 Revision 02.