180 likes | 418 Views
E Co 1/214 th AVN Regt . C-12 Landing Gear. Retraction and Extension of the Landing Gear Is Done by a Hydraulic Power Pack, Located in the Left Wing Center Section Forward of the Main Spar. Landing Gear Power Pack. Power Pack Components. Hydraulic pump 28 vdc motor
E N D
E Co 1/214th AVN Regt C-12 Landing Gear
Retraction and Extension of the Landing Gear Is Done by a Hydraulic Power Pack, Located in the Left Wing Center Section Forward of the Main Spar.
Power Pack Components • Hydraulic pump • 28 vdc motor • Gear selector valve and solenoid • Two section fluid reservoir • Filter screens • Uplock pressure switch • Low fluid level sensor
Hydraulic Lines for Normal Gear Extension Are Routed From the Power Pack to the Nose and Main Gear.
Nose gear downlock is accomplished by a lock in the nose gear actuator and the over-the-line action of the nose gear drag brace assembly. • “J” hooks fitted to each main gear upper drag leg provides a positive down lock for main gear. • An overload protection circuit located in the left wing center section forward of the main spar protects the system from electrical overload.
C-12F Landing Gear Limitations Airspeed • Extension: 181 KIAS • Extended: 181 KIAS • Retraction: 163 KIAS Cycling • Observe one minute cooling time between cycles (1 up - 1 down) with a 15 minute cooling time allowed after six cycles
C-12J Landing Gear Limitations Airspeed • Extension, Extended, and Retraction: 180 KIAS Cycling • Max number of consecutive gear cycles is three, allowing two minutes between cycles • Allow five minutes between each additional cycle • After one hour with no gear activation, the cooling interval reverts back to item 1
Uplock Function • Hydraulic fluid pressure performs this function • At approximately 2775 psi, a pressure switch will interrupt current to the pump motor • Should the pressure drop below 2475 psi, the pressure switch will activate the pump motor until normal pressure is reached
Hydraulic Fluid • The system uses MIL-H-5606 • A caution light “HYD FLUID LOW” will illuminate when the fluid level is low