Tue, Sep 02, 2003
AD/LJ45/7 Main Landing Gear Trunnion Shear Pins
Applicability: Model 45 aircraft, serial numbers 45-005
through 45-208, 45-210 through 45-222, 45-224, 45-225, 45-227, and
45-229 through 45-231.
Note: FAA AD 2003-16-09 Amdt
1. Within 14 days after 3 September 2003.
2. Before the accumulation of 1,800 total landings on the shear
pins, or within 100
landings after 3 September 2003, whichever occurs later.
This Airworthiness Directive becomes effective on 3
Background: Results of fatigue testing conducted by the
manufacturer on the main landing gears of Learjet 45 aircraft
indicate that certain shear pins on the trunnion assemblies of the
main landing gears do not meet the expected life limit. The results
of fatigue testing also indicated that the shear pin bushings in
the trunnion fitting housings had migrated outward from the
fitting, which further weakened the shear pins and contributed to
premature failure. This condition, if not corrected, could result
in collapse of a main landing gear, and consequent reduced
controllability of the aircraft during takeoff and landing.
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