"Non-conforming" spare tail rotor disc assemblies have made their way into the Bell Helicopter Textron Canada (BHTC) fleet, and Transport Canada has ordered operators to check affected helicopters and replace the applicable parts.. In an airworthiness directive
issued recently, the regulator reports that:
"new tail rotor disc assembly Part Number (P/N) 101584-1 or -2, sold through Bell Helicopter Spares beginning March 2009, as an alternate to P/N 32721-1, does not conform to the approved configuration. Operating a helicopter with disc assembly P/N 101584-1 or -2 installed may result in loss of control of the helicopter."
Operators are ordered to check their helos within 100 flight hours or by April 19. Affected birds include certain serial numbers of the 206A, B, L, L-1, L-2, L3, and L4 models.
BHTC's applicable service bulletins were issued last June.