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Following an early morning flight to Bankstown and return to Sydney, the helicopter was being prepared for a further flight. The preflight inspection had proceeded to the point where one of the crew had untied the main rotor from the stowed fore and aft position and was rotating it to the abeam position. During this procedure a restriction was noticed in the main rotor travel. Investigation revealed the restriction was caused by a partial disconnection of the tail rotor drive shaft which allowed the drive shaft to foul the drive shaft cover assembly. One nut connecting the forward disc of the drive shaft was missing from its bolt, the other nut was only finger tight. One nut at the rear disc was only finger tight, the other nut/bolt assembly was completely detached. The self locking capability of the four nuts was found to be serviceable. The helicopter had only operated 12.5 hours since extensive maintenance had been carried out on the tail rotor drive assembly.

Download Final Report
[ Download PDF: 23KB]
General details
Date: 12 July 1989 Investigation status: Completed 
Time: 1130  
Location:Sydney Airport Investigation type: Occurrence Investigation 
State: New South Wales  
Release date: 06 November 1989  
Report status: Final Occurrence category: Incident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Bell Helicopter Co 
Aircraft model: 206 
Aircraft registration: VH-PHW 
Serial number: 2565 
Type of operation: Aerial Work 
Sector: Helicopter 
Damage to aircraft: Nil 
Departure point:Sydney Airport NSW
Departure time:N/A
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