Commonwealth legislation

AD/BELL 47/31 - Lateral Cyclic Torque Tube Safety Washers

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

1/10 complexity

This Airworthiness Directive mandates immediate mechanical action for all Bell 47 helicopters to prevent loss of lateral control. Operators must fit steel safety washers and properly secure the lateral cyclic torque tube ends (including re-torquing nuts and locking with split pins) to stop the ball bearings from shifting or slipping off.

The fix is required forthwith because it eliminates a potential in-flight control failure.

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AD/BELL 47/31 - Lateral Cyclic Torque Tube Safety Washers

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Bell Helicopter Textron 47 (All Variants) Series Helicopters

AD/BELL 47/31 Lateral Cyclic Torque Tube Safety Washers 11/61

Applicability: All models.

Requirement: 1. Fit a steel safety washer to each end of the lateral cyclic torque tube on the outer side of the ball bearing.

2. The outside diameter of these washers should be approximately 1 1/2 inches and they should be so shaped as to obviate the possibility of interference with the bearings in all positions of the control. A suitable design of washer is illustrated in Figure 1.

View image in the official source

Figure 1.

3. Remove the nuts from each end of the torque tube, fit safety washers, replace nuts, torque to 100-110 inch pounds and install split pins.

Compliance: Forthwith.

Source text

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