Document ID: chunk:federal_register_of_legislation:F2006B04346:body:0
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105
CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES

Bell Helicopter Textron 204 Series Helicopters

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under
subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct
the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the
requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

AD/BELL 204/42 42° Gearbox 8/2000
Applicability: | Model 204B with 42° gearbox P/N 204-040-003-023 or -037 installed.
Requirement: Action in accordance with the technical requirements of FAA AD 95-10-07.

Compliance: Before further flight after the effective date of this directive, thereafter at intervals not
exceeding 400 torque events; where a torque event is defined as:

e a takeoff or a lift (internal or external).
This Airworthiness Directive becomes effective on 10 August 2000.

Background: There have been a high number of accidents related to 42° gearbox failures.
Investigation has found that the normal operating regimes of the helicopters exceed
the number of torque events that were anticipated during the certification process.
Any operations outside the limits specified in the flight manual will accelerate drive
train and gearbox failure.

David Alan Villiers
Delegate of the Civil Aviation Safety Authority

6 July 2000

The above AD is notified in the Commonwealth of Australia Gazette on 12 July 2000.

Federal Register of Legislative Instruments F2006B04346