AD/S-76/35 - Tail Rotor Controls Centering Quadrant - Modification
1AD/S-76/35 - Tail Rotor Controls Centering Quadrant - Modification
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
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Sikorsky S-76 Series Helicopters
AD/S-76/35 Tail Rotor Controls Centering Quadrant - Modification
10/84
Applicability: All models S-76A.
Requirement: Sikorsky CSN No. 76-133 Revision A.
Note: FAA AD 84-15-04 Amdt. 39-4893 refers.
Compliance: Unless already accomplished, within 30 days after 31 October 1984.
Background: There have been two reports of tail rotor cable failure. Both failures have been caused by misrigging of the control cables over the pulley guide pin at the lower left-hand pulley, located under the main gearbox. The misrigging has resulted in accelerated wear and subsequent failure. The modification incorporates a centering quadrant which returns the tail rotor pitch controls to the basic rigging position if tail rotor control cable fails.