ATA 27

10,000 Hour Replacement Parts
As many aircraft in the Westwind fleet approach the 10,000-hour mark, we have received numerous calls concerning the requirement to replace the thrust reverser feedback cable assembly. Per Service Bulletin (SB)WW-24-13, this requirement applied to serial numbers 187-199 and 201 only. All other aircraft were delivered with the later dash number assembly.

Another item on the 10,000-hour list is the requirement to replace the flap drive cables with new parts. We have found that several of the new cables that we have received, have failed at the end fitting swedge within the first 200 hours of service. It seems that the vendor did not properly crimp the fitting to the braided outer housing, allowing the housing to pull out of the fitting. If you have replaced any of these cables recently, re-inspect them to make sure they are still serviceable.

We are still finding a lot of operators who do not realize that compliance with SB 1124-27-136, Horizontal Stabilizer Trim Actuator Jackscrew Replacement, terminated Airworthiness Directive (AD) 98-20-35. As a reminder, please keep track of the life-limit card for this actuator. Lucas gets really testy when you can’t provide current cycles and hours on the units.
Concerning the trim actuators—pay close attention to the upper rod end bearings. We still find them being pulled from the rod end housings, due to side-loading. In an effort to eliminate this problem, we are testing, inconjunction with Israel Aircraft Industries International (IAII), a different mounting procedure on an aircraft,and so far, it seems to be working fine.

Please remind your maintenance personnel to make an AIRFRAME logbook entry for the 150 Flight Hour Inspection. It is a Chapter 5 requirement and should be accomplished every engine inspection. Be aware that CAMP SYSTEMS does not track this as a 150 Flight Hour Inspection.