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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Bell UH-1 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/UH-1/10 Tail Rotor Gearbox Duplex Bearings 8/2000

Applicability: Model UH1A, UH1B, UH1E, UH1F, UH1H, UH1L, and TH1L.

Requirement: Remove from service tail rotor gearbox duplex bearing sets P/N 204-040-424-001 with S/Nos 1 to 182, MB183 to MB382, MB442, MB486, MB513, MB518, MB519, MB524, MB530, MB531, MB544, MB545, MB548, MB549, MB551, MB553, MB554, MB561, MB659, MB743, MB744, MB760 to MB769, and MB927 to

MB936 inclusive installed in tail rotor quill P/N 204-040-012-009.

Note: FAA AD 90-10-05 refers.

Compliance: Before further flight after the effective date of this directive.

This Airworthiness Directive becomes effective on 10 August 2000.

Background: This directive is issued to prevent failure of the tail rotor gearbox and subsequent loss of control.

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.