AD/BELL 407/24 - Tail Rotor Gearbox
Tail Rotor Gearboxes held as spares:Tail Rotor Gearboxes held as spares:
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Tail Rotor Gearboxes held as spares:
For Requirements 1, 2 and 3: Prior to installation in a helicopter. This Airworthiness Directive becomes effective on 30 October 2003.
Background: There have been a number of tail rotor gearboxes identified as not having the required oil feed gallery to the duplex bearing. This reduces the oil supply to the bearing that could lead to failure of the duplex bearing. The splash lubrication the bearing receives will be sufficient to maintain the integrity of the bearing before modification of the tail rotor gearbox is required as detailed in this Directive.
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Jim Coyne
Delegate of the Civil Aviation Safety Authority 19 September 2003
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The above AD is notified in the Commonwealth of Australia Gazette on 8 October 2003.