Replacement Thrust Reverser Accumulator for the TR3000 Thrust Reverser System.

Installation of access doors in engine nacelle according to Drawing 375201, Revision A, dated 1/13/78, or later FAA approved revision.

Installation of Woodward Electronic Engine synchronizer system.

Installation of electronic engine synchronizer system.

Installation of Bizjet International Inlet Anti-ice Heat Blanket.

Extend the lives of the control surfaces and engine yoke beyond the current 20,000 hours by utilizing a Damage Tolerance Methodology and the recurrent inspections called out in the FAA Approved Airplane Maintenance Manual Supplement for Learjet 23.

Installation of engine thrust reversers.

Replacement of throttle knob, Model EP-004, for 20 series Learjet equipped with Dee Howard thrust reversers.

Installation of Shaw Aero fuel filler cap P/Ns 457-2, -266, -370, 431, -9R, -125, -1251.

Modification of the engine exhaust system.