Landing Gear

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
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 SystemReview Questions
The landing gear are help in the position with
____________ and are held down with ____________.
42
C-12 Landing Gear SystemReview 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. TRUE
or FALSE
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? Nose
Gear Main Gear
56
C-12 Landing Gear System Summary
System description Normal system
operations Emergency system operations Brake
system Landing gear warning system Abnormal
operations