1. Landing Gear

2. Terminal Learning Objective
Action: Identify the subsystems of the C-12T2/U landing gear system and explain the basic operating principles.
Condition: Using student handout and classroom notes.
Standard: IAW the IGRV SEP

3. RISK ASSESSMENT LEVEL: IV, D, LOW ENVIRONMENTAL CONSIDERATIONS:
SAFETY REQUIREMENTS:
NONE
RISK ASSESSMENT LEVEL:
IV, D, LOW
ENVIRONMENTAL CONSIDERATIONS:
NO IMPACT

4. C-12T2/U Landing Gear System Description
Electrically Activated
Switches, relays, electrically powered valves are actuated when the landing gear switch is moved in the cockpit
Hydraulically Operated
Pressurized fluid is moved to the landing gear hydraulic actuators to raise and lower the landing gear.

5. C-12 Landing Gear System Cockpit Switches

6. C-12 Landing Gear System Fill Reservoir

7. C-12 Landing Gear System Fill Reservoir

8. C-12 Landing Gear System Fluid Level Dipstick

9. C-12 Landing Gear System Main Reservoir

10. C-12 Landing Gear System Reservoir / Power Pack

11. C-12 Landing Gear System Accumulator

12. C-12 Landing Gear System Description
3 lines from the pump to each gear actuator
Retraction (becomes return line during extension)
Extension (becomes return line during retraction)
Emergency
Gear are held up with hydraulic pressure
2474 psi to 2775 psi
Gear are held down with over-center locks

13. C-12 Landing Gear System Retraction Operations

14. C-12 Landing Gear System Extension Operations

15. C-12 Landing Gear System Emergency Extension Operations

16. C-12 Landing Gear System Check Valves

17. C-12 Landing Gear System Nose Gear Landing/Taxi Lights

18. C-12 Landing Gear System Turning Limits

19. C-12 Landing Gear System Crush Block

20. C-12 Landing Gear System Nose Gear Torque Knee

21. C-12 Landing Gear System Shimmy Dampner

22. C-12 Landing Gear System Main Gear Drag Brace

23. C-12 Landing Gear System Main Gear Down Lock

24. C-12 Landing Gear System Main Gear Door

25. C-12 Landing Gear System Main Gear Door

26. C-12 Landing Gear System Main Gear Torque Knee

27. C-12 Landing Gear System Safety Switch

28. C-12 Landing Gear System Brake Fluid Reservoir

29. C-12 Landing Gear System Main Brakes

30. C-12 Landing Gear System Pilot Brakes

31. C-12 Landing Gear System Co-Pilot Brakes

32. C-12 Landing Gear System Parking Brake Set

33. C-12 Landing Gear System Landing Gear Warning Horn

34. C-12 Landing Gear System Landing Gear Warning Horn

35. C-12 Landing Gear System Landing Gear Warning Horn

36. C-12 Landing Gear System Landing Gear Warning Horn

37. C-12 Landing Gear System Landing Gear Warning Horn

38. C-12 Landing Gear System Landing Gear Warning Horn

39. C-12 Landing Gear System
Questions??????????

40. C-12 Landing Gear System

41. C-12 Landing Gear System Review Questions
The landing gear are help in the position with ____________ and are held down with ____________.

42. C-12 Landing Gear System Review Questions
The landing gear are help in the position with hydraulic pressure and are held down with over-center locks.

43. C-12 Landing Gear System Review Questions
The brakes use the same type of hydraulic fluid used by the landing gear system.
TRUE or FALSE
The brakes use hydraulic fluid from the same reservoir as the landing gear system.

44. C-12 Landing Gear System Review Questions
The brakes use the same type of hydraulic fluid used by the landing gear system.
TRUE
The brakes use hydraulic fluid from the same reservoir as the landing gear system.
FALSE

45. C-12 Landing Gear System Review Questions
The timer logic relay in the landing gear system will activate after the gear motor has been operating for ________.

46. C-12 Landing Gear System Review Questions
The timer logic relay in the landing gear system will activate after the gear motor has been operating for 14 seconds.

47. C-12 Landing Gear System Review Questions
The timer logic relay activates for gear retraction operations only.
TRUE or FALSE

48. C-12 Landing Gear System Review Questions
The timer logic relay activates for gear retraction operations only.
FALSE

49. C-12 Landing Gear System Review Questions
If the pilot raises the landing gear control switch, and the landing gear selector valve fails to operate:
The gear will retract normally.
The gear will not retract.
The timer logic relay will activate after 14 seconds.
The landing gear warning horn will activate.
The gear handle light will illuminate.
The three green down lights for the gear will extinguish.

50. C-12 Landing Gear System Review Questions
If the pilot raises the landing gear control switch, and the landing gear selector valve fails to operate:
The gear will retract normally.
The gear will not retract.
The timer logic relay will activate after 14 seconds.
The landing gear warning horn will activate.
The gear handle light will illuminate.
The three green down lights for the gear will extinguish.

51. C-12 Landing Gear System Review Questions
The pilot places the gear control switch in the up position. Once the landing gear is fully retracted, the uplock pressure switch fails to operate:
The gear will retract normally.
The landing gear pump motor will shut down when the gear is fully retracted.
The landing gear pump motor will be shut down by the timer logic relay.
The landing gear down indicator lights (green) will remain illuminated.
The gear relay circuit breaker will open.

52. C-12 Landing Gear System Review Questions
The pilot places the gear control switch in the up position. Once the landing gear is fully retracted, the uplock pressure switch fails to operate:
The gear will retract normally.
The landing gear pump motor will shut down when the gear is fully retracted.
The landing gear pump motor will be shut down by the timer logic relay.
The landing gear down indicator lights (green) will remain illuminated.
The gear relay circuit breaker will open.

53. C-12 Landing Gear System Review Questions
The parking brake can be set from ____________.
The left seat
The right seat
Either seat
The toilet

54. C-12 Landing Gear System Review Questions
The parking brake can be set from ____________.
The left seat
The right seat
Either seat
The toilet

55. C-12 Landing Gear System What is an unsafe gear indication?
What would you do if one main gear or the nose gear green light failed to illuminate?
What are you going to do if one gear fails to extend?
Main Gear
Nose Gear
What are you going to do if one gear fails to extend after manual extension?

56. C-12 Landing Gear System Summary
System description
Normal system operations
Emergency system operations
Brake system
Landing gear warning system
Abnormal operations