EXTENSION/RETRACTION SYSTEM - GENERAL
The extension/retraction system allows the extension and retraction of the
main and nose landing gears under inputs controlled by the pilot.
The extension/retraction system includes:
• one Landing Gear Control Valve (LGCV)
• two main and one nose landing gear extension/retraction actuators
(RA)
• two main landing gear shortening actuators (SA)
• the Landing Gear Control Panel (LGCP)
• the Landing Gear Control Lever (LGCL)
• the microswitches
The extension/retraction system is hydraulically powered by
• hydraulic system no.2 for normal extension/retraction
• hydraulic system no.1 for emergency extension
The LGCV acts on a manifold, which interface and operates the hydraulic
actuators of the nose and main landing gears.
The extension/retraction system is electrically operated through the Landing
Gear Control Panel (LGCP) located in the cockpit and through a logical
sequence controlled by electrical microswitches.
The landing gear is mechanically locked when fully extended and hydraulic
pressure is received from actuators.
The landing gear is held in the retracted position by hydraulic pressure; in
case of loss of hydraulic power the landing gear legs come out of their bays
by effect of their own weight.