AD NUMBER: 2007-17-05
SUBJECT: Airworthiness Directive 2007-17-05 SUMMARY: This amendment
adopts a new airworthiness directive (AD) for Sikorsky Aircraft
Corporation (Sikorsky) Model S92-A helicopters.
This action requires, within a specified time, borescope
inspecting a certain part-numbered tail rotor pitch change shaft
and bearing assembly (shaft and bearing assembly) and also
inspecting after any installation.
This amendment is prompted by an incident involving failure of a
shaft and bearing assembly and servo clevis shaft resulting in loss
of tail rotor control.
The actions specified in this AD are intended to prevent failure
of a shaft and bearing assembly, loss of tail rotor pitch and yaw
control, and subsequent loss of control of a helicopter.