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The Duncan Download Blog: Business Aviation Advice & Observations

Challenger Landing Gear Hidden Corrosion

Posted by Diane Heiserman on Tue, Feb 26, 2013 @ 08:02 AM

Contributed by Jerry Cable, Accessory Tech Rep

Challenger landing gear requires a detailed inspection at 60 months for the 600 and 601 and 96-months for the 604 and 605. It must then undergo a 120-month restoration for the 600 and 601 and 192 month for the 604/605.

The reason for these inspections is to check for cracks, wear and corrosion. Years of water, dirt, salt air, fluid and various other electrolytes have taken their toll. The gear is very susceptible to corrosion and even though steps may have been taken to lessen the effects, some corrosion still forms.

Corrosion is normally found throughout the gear but can often be repaired using standard repair schemes available in the CMM or through engineering concessions. Sometimes, however, the corrosion has exceeded the limits of those repair tolerances.

Some of the more severe corrosion found during these inspections is detailed in the following photographs.

Challenger MLG Trailing Link

MLG Trailing Link CL600/601

  • Axle Bore corrosion found in 35% of the restorations we perform.*

Challenger MLG Side Strut Pin

MLG Side Strut Pin CL600/601

  • Corrosion on OD radius found in 50% of restorations.*

Challenger MLG Hinge Pin

MLG Hinge Pin CL600/601

  • Corrosion on the ID mating with brake line swivels found in 70% of the restorations.*

Challenger MLG Oleo Pin

MLG Oleo Pin CL600/601

  • Corrosion on the ID found in 65% of the overhauls.*

Challenger MLG Oleo Cylinder

MLG Oleo Cylinder CL600/601

  • ID corrosion found in 50% of the restorations.*

Challenger NLG Main Fitting

NLG Main Fitting CL600/601

  • Corrosion under steering sleeve found in 50% of restorations.*

Challenger NLG Plunger Tube

NLG Plunger Tube CL600/601

  • Corrosion, lower band mating with axle found on 75% of restorations.*

NLG Axle Barrel CL600/601

  • Corrosion mating with plunger tube found on 75% of restorations.*

Challenger NLG Stering Cuff

NLG Steering Cuff CL600/601

  • Corrosion in the ID Bore found in 60% of restorations.*

Challenger NLG Axle Transverse Bore

NLG Axle Transverse Bore CL600/601

  • Corrosion found on 50% of the restorations.*

Challenger NLG Steering Rack

NLG Steering Rack CL600/601

  • Tooth damage going to caster mode found during 90% of restorations.*

Challenger MLG Side Strut Rod End

MLG Side Strut Rod End CL600/601

  • Bearing bore corrosion found in 85% of the restorations.*

Challenger MLG Side Strut

MLG Side Strut CL600/601

  •  Bearing bore corrosion found in 85% of the restorations.*

*Percentages are based on Duncan Aviation data.

Jerry Cable is an Accessories Tech Rep located at Duncan Aviation’s Lincoln, Nebr., facility. He is a landing gear and accessory components and systems specialist. His aviation career began in 1991.

Tags: Parts & Accessories, Challenger, Landing Gear

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