AD/HU 369/2 Amdt 1 - Tail Rotor Gearbox - Inspection and/or Replacement

This airworthiness directive requires owners/operators of McDonnell Douglas (Hughes) and Kawasaki 369 series helicopters to inspect and/or replace tail rotor gearboxes P/N 369A5400 with serial numbers listed in Hughes SIN No. HN‑1.1 (and addendum) before the gearbox reaches 90 hours total time in service. It matters because it forces operators to check serial numbers, track component hours, consult the manufacturer’s SIN for procedures, and bear inspection/replacement costs and aircraft downtime to meet the compliance deadline.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters

AD/HU 369/2

Amdt 1

Tail Rotor Gearbox - Inspection and/or Replacement

6/70

Applicability: All models fitted with tail rotor gearbox P/N 369A5400 with gearbox S/Nos. listed in Hughes SIN No. HN-1.1 and Addendum.

Document: Hughes SIN No. HN-1.1 and addendum XI.

Compliance: Before achieving 90 hours component total time in service, after 1 September 1971.