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Learjet 40/45 Main Landing Gear Actuator End Caps Advisory Wire 32-053

Posted by AskBob on 11.10.10 at 09:37 AM

INTRODUCTION:
Heroux, the component manufacturer, and Bombardier were recently given reason to question the load testing that was originally accomplished on the Learjet 45 Main Landing Gear (MLG) Actuator during certification. This occurred while accomplishing ongoing testing. Fatigue testing was re-performed and resulted in the need to lower the life limit of the actuator end caps.
Please note no issues with the end caps have been reported from in-service aircraft.

DESCRIPTION:
Three (3) samples of 45 MLG actuators have been retested and resulted in the need to reduce the end cap life limit. The end cap current life is 17,000 landings. The new life limit will be lowered to 2,387 landings for FAA governed aircraft and 1,988 landings for EASA governed aircraft. There will be a grace period of 25 landings beyond the current number of landings, but only for those actuators that are already beyond the new life limit. No other extensions are available at this time.

ACTION: See attached Action Wire

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Michael Kralicek (not verified) on Thu, 11/11/2010 - 10:48

Looks as if bombardier's pro rate of the end cap will give 5260.8 off the cost of the replacement. The difficult part is, the parts availability with first parts being issued to aircraft that are already over the 25 landing limit. That makes sense, if there are not too many of the fleet already there.

Question if operators with larger fleets will get preference?

One thing I do know is, in any case - get the parts on order now, to be in line, because at some point the operators that have an active order in the system first will take priority over orders taken later.

Posted by Michael Kralicek via LinkedIn

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