Landing Gear and Brakes

Question 1

Describe the Hydraulic Power Pack:

Answer 1

28 VDC motor driven
Pressurized by bleed air
Pressure switches

Located inboard of left nacelle

Question 2

What powers the landing gear motor?

Answer 2

R Gen Bus

Question 3

What powers the landing gear relay?

Answer 3

2 DFB

Retraction power through CB, gear handle, R squat switch, pressure switch.
Extension through CB, gear handle, 3 down switches.

Question 4

Red Gear Handle

Answer 4

Indicates discrepancy between handle and gear position, or gear in transit. All three must be down and locked, OR fully up, to extinguish.

Question 5

Gear Horn

Answer 5

Power below approx 79% N1 (position)

Flaps positioned beyond APR

Question 6

Describe moving gear up:

Answer 6

Gear control lever position completes circuits to pump motor relay and up solenoid. Pump motor is powered, gear selector valve moves to “up” and fluid pressure moves to “retract” side. Positive pressure keeps gear up, 2,775psi opens uplock pressure switch, 2,475psi or less kicks pump back on.

Question 7

What psi kicks the gear pump back on?

Answer 7

2,475psi

Question 8

Describe moving gear down:

Answer 8

Gear handle positioned down completes circuit to down solenoid and motor pump relay. Pressure moves to “extend” side of gear actuators. Mechanical downlock and drag braces lock the gear in position. Downlock switches actuate, when third is actuated, the circuit to pump motor relay is opened and stopped.

Question 9

What is on the Left Safety Switch?

Answer 9

Preset Solenoid
Dump Solenoid
Safety Valve
Door seal solenoid
Ambient air modulating valves
Lift computer (stall warning)
Stall warning heat
Landing Gear select solenoid

Question 10

What is on the Right Safety Switch?

Answer 10

Landing gear handle lock solenoid (j-hook)
Landing gear motor
Flight hourmeter
Electric heat

Question 11

What powers the landing gear selector valve?

Answer 11

2 DFB

Question 12

Down lock release/ J-Hook

Answer 12

Normally activated by the right squat switch

Question 13

Gear doors

Answer 13

Nose- Rollers and cams, mechanical

Main- stock, Raisbeck, half size. Rollers and cams. OR link assembly if High Float tires

Question 14

Green Landing Gear lights

Answer 14

Nose– Drag brace over-center, actuator locked down

Main– drag braces have locked

Question 15

Cycle limitations:

Answer 15

One cycle (up and down) every 5 minutes
Six cycles followed by 15 minute cooldown

Question 16

Where is the hydraulic reservoir located?

Answer 16

Forward avionics bay

Question 17

Where is the hydraulic reservoir vented?

Answer 17

To the pressure vessel (cabin) to prevent possible fluid loss