AD NUMBER: 2004-03-08
MANUFACTURER: Learjet
SUBJECT: Airworthiness Directive
2004-03-08
SUMMARY: This amendment adopts a new
airworthiness directive (AD), applicable to certain Learjet
Model31, 31A, 35, 35A (C-21A), 36, and 36A airplanes, that requires
modification of the drag angles ofthe fuselage and engine pylons to
gain access to the shear webs of the forward engine
beams;repetitive inspections of the shear webs of the forward
engine beams for cracks; follow-onactions; and modification/repair
of the shear webs of the forward engine beams, as necessary,which
terminates the repetitive inspections. This action is necessary to
prevent significant structural damage to the engine