Learjet 45 subject of emergency AD

Aviation International News » April 2003
January 17, 2008, 5:20 AM

An emergency AD requires certain Learjet 45 horizontal stabilizer actuator assemblies to be replaced with new assemblies before further flight. The directive (AD 2003-06-51) was issued March 20 after a Learjet 45 in Australia reported a severe vibration followed by a rapid nose-down pitch. Investigation revealed that the acme screw–the primary load path of the actuator–was fractured, and the backup assembly had failed.

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