Commonwealth legislation

AD/BELL 407/7 - Tail Rotor Hanger Bearing Support Inspection

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires owners/operators of specified Bell 407 helicopters to perform a shimming procedure on the tail-rotor hanger bearing support and the bearing hanger on the tail boom, following BHTC Alert Service Bulletin 407-97-7, at the next scheduled inspection and no later than 1 August 1999. It obliges aircraft owners/operators to fund and arrange the work; the Civil Aviation Safety Authority enforces the directive because gaps can cause severe vibration and possible tail-rotor drive-shaft failure.

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AD/BELL 407/7 - Tail Rotor Hanger Bearing Support Inspection

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Bell Helicopter Textron Canada (BHTC) 407 Series Helicopters

AD/BELL 407/7 Tail Rotor Hanger Bearing Support Inspection 5/99

Applicability: Bell (BHTC) Model 407 helicopters serial numbers 53000, 53002 through 53065,

53067 and 53069 through 53075.

Requirement: Perform a shimming procedure on the tail rotor hanger bearing support and the bearing hanger on the tail boom in accordance with the procedures specified in BHTC Alert Service Bulletin (ASB) no. 407-97-7 dated 27 February 1997.

Note: Transport Canada Airworthiness Directive CF-97-08, dated 08 July 1997 refers.

Compliance: At the next scheduled inspection but no later than 01 August 1999. This Airworthiness Directive becomes effective on 20 May 1999.

Background: In service reports have shown that some aircraft have developed a gap between the tail rotor hanger bearing support and the bearing hanger on the tail boom. This situation, if not corrected could lead to serious vibration of the tail rotor drive shaft and, eventually, to total disintegration of the shaft. This Directive introduces a shimming procedure to eliminate the gap and the possibility of damaging vibration of the tail rotor drive shaft.

Source text

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

1 AD/BELL 407/7 - Tail Rotor Hanger Bearing Support Inspection