The FAA is proposing the adoption of a new AD applicable to certain Learjet Model 31, 31A, 35, 35A (C-21A), 36, and 36A airplanes. This proposal would require modification of the drag angles of the 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-on actions; and modification/repair of the shear webs of the forward engine beams, as necessary, which would terminate the repetitive inspections. The FA claims this action is necessary to prevent significant structural damage to the engine pylons, possible separation of the engines from the fuselage, and consequent reduced controllability of the airplane. All comments must be received by Dec. 29, 2003.
Learjet 31, 35, 36
Key Takeaways:
- The FAA is proposing a new Airworthiness Directive (AD) for specific Learjet Model 31, 31A, 35, 35A (C-21A), 36, and 36A airplanes.
- This AD would require modifications to the drag angles of the fuselage and engine pylons to allow access for repetitive inspections of the forward engine beam shear webs for cracks.
- Follow-on actions, including necessary modification or repair of the shear webs, would also be required and would terminate the repetitive inspections.
- The primary goal of this action is to prevent significant structural damage, potential engine separation from the fuselage, and subsequent loss of aircraft controllability.
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