Commonwealth legislation

AD/HU 369/55 - Main Gear Box Ring Gear Carrier Shaft - Inspection

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legislative instrument

Plain English Summary

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This airworthiness directive requires owners/operators of McDonnell Douglas (Hughes) and Kawasaki 369D helicopters fitted with main transmission P/N 369D25100 to have the main gearbox ring‑gear carrier shaft inspected because cracks were found in the welded junction (Background; Applicability). It excludes transmissions with a “U” serial‑prefix or P/N 369D25100‑501 and later. Inspections must follow Hughes Service Information Notice DN‑105 and be done within 100 hours TIS after 30 Nov 1982 and thereafter at intervals not exceeding 300 hours (Document; Compliance).

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AD/HU 369/55 - Main Gear Box Ring Gear Carrier Shaft - Inspection

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters

AD/HU 369/55 Main Gear Box Ring Gear Carrier Shaft - Inspection

11/82

Applicability: All model 369D series helicopters fitted with main transmission P/N 369D25100 - Basic Configuration.

Note: Transmissions with a letter “U” prefix to the serial number on the transmission ID plate, or transmissions P/N 369D25100-501 and later suffix number configurations are not affected by this Directive.

Document: Hughes SIN No. DN-105.

Note: FAA AD 82-17-01 refers.

Compliance: Inspect in accordance with Part 1 of the document within 100 hours time in service after 30 November 1982, and thereafter at periods not exceeding 300 hours time in service. Inspections in accordance with Part 1 may be discontinued subsequent to inspection in accordance with Part II of the document.

Background: Cracks have been found in the electron beam welded junction of the lower disc of the ring gear carrier and the output shaft of the main gear box.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/HU 369/55 - Main Gear Box Ring Gear Carrier Shaft - Inspection