Transcript E Co 1/214th AVN Regt - KJL Grafx

E Co
th
1/214 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
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Hydraulic pump
28 vdc motor
Gear selector valve and solenoid
Two section fluid reservoir
Filter screens
Uplock pressure switch
Low fluid level sensor
Landing Gear Power Pack and
Hydraulic Plumbing
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.
Nose Gear Actuator
Main Gear Wheel Well
Main Gear “J” Hook
Main Gear Up Switch
Main Gear Down Switch
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