1. E Co 1/214th AVN Regt
C-12 Landing Gear

2. 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.

3. Landing Gear Power Pack

4. 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

5. Landing Gear Power Pack and Hydraulic Plumbing

6. Hydraulic Lines for Normal Gear Extension Are Routed From the Power Pack to the Nose and Main Gear.

9. 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.

10. Nose Gear Actuator

11. Main Gear Wheel Well

12. Main Gear “J” Hook

13. Main Gear Up Switch

14. Main Gear Down Switch

15. 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

16. 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

17. 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

18. Hydraulic Fluid The system uses MIL-H-5606
A caution light “HYD FLUID LOW” will illuminate when the fluid level is low