AD/HU 369/71 - Tail Rotor Transmission Mounting Studs

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters

AD/HU 369/71 Tail Rotor Transmission Mounting Studs 13/87

TLX

All model 369D, 369E, 369F and 369FF series helicopters.

Action in accordance with McDonnell Douglas SIN No DN-151, EN-39, FN-28, as applicable.

Part 1 of Requirement document - unless already accomplished, prior to next flight.

Part 2 of Requirement document - during each pilot’s preflight inspection.

Part 3 of Requirement document - unless already accomplished, within 25 hours time in service or by 20 November 1987 whichever occurs first.

Part 4 of Requirement document - prior to each issue or a new Maintenance Release after 20 November 1987.

The Part 2 inspection may be accomplished by the pilot in command in which case he shall enter and certify for this AD in Col 2 Part 3 of the Maintenance Release on each occasion.

There have been several reported instances where some or all tail rotor transmission mounting studs have failed with indications of bending fatigue. Also, movement between the T/R gearbox and mounting bracket has occurred due to loss of mounting stud nut torque.