The Bombardier Learjet 20* and Learjet 30* series Time Limits and Maintenance Checks have recently added a new TR (Temp Revision) to Chapter 5-10-29. This TR includes a new IRN 3255002 for the required inspection of the Lear Avia Nose Wheel Steering Servos.
The Lear Avia servos are now required to be inspected every 2,400 hours, or 2 years from May 2, 2016, if they have never been inspected before.
Since these servos were on condition previously, we have found a number of them have very weak clutches from years of in-service operation. The new inspection will ensure that these discrepancies are corrected during a scheduled event rather than found during taxi, which may result in a missed flight or unexpected downtime.
Lear Avia Nose Servos Part Numbers
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Fuel System Contamination & Starvation