Commonwealth legislation

AD/HU 369/89 - Main Blade Root End

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

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This airworthiness directive requires operators of McDonnell Douglas (Hughes) and Kawasaki 369-series helicopters to carry out specified inspections of main rotor blade root ends, using the manufacturer's service information. It mandates an immediate short‑term inspection and recurring inspections at 100‑hour intervals. The stated purpose is to detect cracked blades and prevent blade separation and loss of control following reported incidents.

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AD/HU 369/89 - Main Blade Root End

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 369/89 Main Blade Root End 8/96 DM

Applicability: Model 369, 369A, 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS, and

500N helicopters.

Requirement: Inspect in accordance with Part I and Part II of McDonnell Douglas Helicopter Systems Service Information Notice HN-239, DN-188,EN-81, FN-67, or NN-008, as applicable.

Note: FAA AD 96-10-09 Amdt 39-9615 refers.

Compliance: For Part I: Unless the initial inspection has already been accomplished, within 10 hours time in service after 17 June 1996.

For Part II: Within 100 hours time in service after 17 June 1996, thereafter at intervals not to exceed 100 hours time in service.

Background: The FAA received a report of one accident in which a blade separated from the helicopter, as well as eight other reports of cracked blades. The actions specified in this Directive are intended to prevent failure of a blade and subsequent loss of control of the helicopter.

Source text

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

1 AD/HU 369/89 - Main Blade Root End