Hawker Landing Gear Overhauls

August 2011

Cable, Jerry - Accessory Tech Rep - Lincoln, NE (LNK). Aviation professional since 1991.

Airframes: Astra, Challenger, Citation, Embraer, Falcon, Gulfstream, Hawker, Learjet, King Air, Global, Westwind

Hydraulic equipment and pumps, Pneumatic valves, Wheel and Brake, Emergency Power Supplies, Electric Motors, Mechanical Actuators, Landing Gear and Accessory Components and Systems Specialist.

Direct: 402.479.8112
Mobile: 402.432.0154

Corroded landing gear is nothing new and usually comes as no big surprise to anyone. The Hawker 125 series landing gear is no different. Years of water, dirt, salt air, fluid and various other electrolytes have taken their toll on this gear as well. The gear is very susceptible to corrosion, even though steps have been taken to lessen the effects.

During the overhaul process, corrosion has been found on just about every piece and part of the gear. The corrosion can often be repaired using standard repair schemes available in the CMM, but sometimes the corrosion has even developed beyond the limits of those repair tolerances.

Some of the more severe corrosion is depicted in the following slides. Duncan Aviation has Hawker Airframe Factory Authorizations at Lincoln, NE (LNK).

	MLG Cylinder Square Journal Corrosion where the retract lever attaches to the strut found in 90% of the overhauls. CMM details a repair scheme for the area
	MLG Retract Lever Corrosion on face and square bore found in 90% of overhauls. CMM details a repair scheme for the area.
	MLG Cylinder Round Trunnion Journal Corrosion found in 75% of the overhauls. CMM details a repair scheme for this area.
	MLG Trunnion Block Corrosion through bolt bore found in 50% of the overhauls. No repair schemes exist for this area.
	MLG Axle Socket Corrosion in lower plunger tube mating surface found in 70% of overhauls. CMM details a repair scheme for this area.
	NLG Cylinder Corrosion in lower sealing area found in 75% of overhauls. CMM details a repair scheme for this area
	NLG Torque Link Corrosion in Pick-up Sleeve ID found on 75% of overhauls. CMM details a repair scheme for this area.
	NLG Steering Connecting Rod Corrosion in bearing bore found on 75% of overhauls. No repair scheme available.
	NLG Steering Sleeve Corrosion on outside face and ID bushing bore found in 50% of overhauls. No repair scheme exists.
	NLG Axle Barrel Wear from felt on ID bearing bore found on 45% of overhauls. No repair scheme available.
	Drag Stay Pickup Sleeve Attach bushing bore corrosion found in 35% of overhauls. CMM details a repair scheme for this area.
	MLG Side Stay Jack Link Square bore corrosion found in 80% of the overhauls. CMM details a repair scheme for the area.
	MLG Side Stay Main Distance Pin Corrosion on OD at aircraft mating surface found in 85% of overhauls. No repair scheme available.