COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Sikorsky S-76 Series Helicopters
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 39.1 (1) of CAR 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.
AD/S-76/66 Main Landing Gear Positioning Rod Assembly 3/2001
DM
Applicability: All Model S-76A, S-76B and S-76C helicopters up to and including serial number 760513 with positioning rod assembly part number 1945E-31A or 2071-31, or side brace rod end part number 1945E-235 or 2071-235, installed.
Requirement: 1. Inspect the positioning rod assembly and side brace rod end for corrosion in accordance with Section 2, Accomplishment Instructions, in BFGoodrich Service Bulletin (SB) No.76A-32-03, Revision 1, dated 15 September 2000. Replace any part that is corroded with a serviceable part before further flight.
2. If the positioning rod assembly and side brace rod end were inspected and re- assembled in accordance with BFGoodrich Component Maintenance Manual with Illustrated Parts List, 1945/2071 Series Main Landing Gear, No. 32-10-01, Revision 4, dated 15 December 1994, within the past 24 months, inspect the positioning rod assembly and side brace rod end in accordance with Section 2 of SB 76A-32-03 Revision 1. Replace any part that is corroded with a serviceable part before further flight.
3. For side brace rod ends that are not re-assembled with Mastinox sealant or re- assembled with Mastinox sealant but without cadmium plate restoration; inspect the positioning rod assembly and side brace rod end for corrosion in accordance with Section 2 of SB 76A-32-03 Revision 1. Replace any part that is corroded with a serviceable part before further flight.
4. For side brace rod ends assembled with Mastinox sealant and cadmium plate restoration or for side brace rod ends re-assembled with Mastinox but that did not previously require rework due to corrosion, inspect the positioning rod assembly and side brace rod end for corrosion in accordance with Section 2 of SB 76A-32- 03 Revision 1. Replace any corroded part with a serviceable part before further flight.
Note: FAA AD 2001-01-04 Amendment 39-12074 refers.
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Compliance: 1. Before 28 February 2001.
2. Before 14 May 2001.
3. At intervals not to exceed 3 months.
4. At intervals not to exceed 12 months or 1,500 hours time in service, whichever occurs first.
This Airworthiness Directive becomes effective on 14 February 2001.
Background: The FAA received a report of a landing gear collapse cause by corrosion due to dissimilar metals in the landing gear rod end. The actions specified by this Directive is intended to detect corrosion of the threaded joint in the rod assembly to prevent a collapse of the landing gear, and subsequent loss of control of the helicopter during landing.
David Alan Villiers
Delegate of the Civil Aviation Safety Authority 7 February 2001
The above AD is notified in the Commonwealth of Australia Gazette on 14 February 2001.