Landing Gear
Hydraulic power for retraction, extension, and nose wheel steering is normally supplied by
hydraulic system A. A manual landing gear extension system and an alternate source of
hydraulic power for nose wheel steering are also provided. The normal brake system is
powered by hydraulic system B. The alternate brake system is powered by hydraulic
system A. Antiskid protection is provided on both brake systems, but the autobrake system
is available only with the normal brake system.
Option
A brake temperature monitoring system displays each main landing gear brake
temperature on the lower DU.
Landing Gear Operation
The landing gear are normally controlled by the LANDING GEAR lever. On the ground, a
landing gear lever lock, prevents the LANDING GEAR lever from moving to the up position.
An override trigger in the lever may be used to bypass the landing gear lever lock. In flight,
the air/ground system energizes a solenoid which opens the lever lock.
Landing Gear Retraction
When the LANDING GEAR lever is moved to UP, the landing gear begins to retract. During
retraction, the brakes automatically stop rotation of the main gear wheels. After retraction,
the main gear are held in place by mechanical uplocks. Rubber seals and oversized
hubcaps complete the fairing of the outboard wheels. The nose wheels retract forward into
the wheel well and nose wheel rotation is stopped by snubbers. The nose gear is held in
place by an overcenter lock and enclosed by doors which are mechanically linked to the
gear. Hydraulic pressure is removed from the landing gear system with the LANDING
GEAR lever in the OFF position.
