ATA 32 Landing Gear

Question 1

What pressure source(s) is are used to extend and retract the landing gear?

Answer 1

Normally system A for retraction, System B will kick in if A has low pressure.

Question 2

There are ____ compressed sensors on each landing gear.

Answer 2

2

Question 3

How is the MLG inner door positioned?

Answer 3

Mechanically(hockey stick).

Question 4

How is the landing gear selector valve controlled?

Answer 4

Electrically through a lever on the P2 panel.

Question 5

The landing gear control lever is actually a ______ .

Answer 5

Electric switch

Question 6

The landing gear lever lock solenoid is energized to _______________ the lever.

Answer 6

Unlock.

Question 7

How is the MLG locked down?

Answer 7

Over-center downlock with springs keeping it in position.

Question 8

What is the purpose of the nose gear lock link?

Answer 8

Keeps it locked in the extended or retracted position.

Question 9

Describe the indications for a PSEU dispatchable fault.

Answer 9

Maint light comes on and you go through the MAX maintenance to see if you can MEL it.

Question 10

What is the purpose of the MLG or NLG transfer cylinder?

Answer 10

Gives time for the gear to unlock before the actuator moves the gear.

Question 11

List the conditions required to allow B hydraulic pressure retract the gear.

Answer 11

Airplane in the air
Landing gear lever not down
One main landing gear not up
Left engine N2 speed less than 50%
Hydraulic system B pressure supplied to valve.

Question 12

List the brake systems normal and alternate pressure sources.

Answer 12

System B is for primary and System A is for alternate.

Question 13

What hydraulic system keeps the brake accumulator charged?

Answer 13

System B

Question 14

Where is the brake accumulator located?

Answer 14

Right aft wing to body fairing

Question 15

What component causes the switch from normal to alternate brakes?

Answer 15

Alternate brake selector valve pressured by System A.

Question 16

Autobrakes use the ____ hydraulic system.

Answer 16

System B

Question 17

What is the normal pressure source for nose wheel steering?

Answer 17

System A.

Question 18

List the conditions needed to get alternate nose wheel steering.

Answer 18

Airplane on the ground
System B at 21%

Question 19

How is nose wheel steering pressure disabled for towing?

Answer 19

Nose wheel bypass pin

Question 20

Just for the fun of it, how many prox sensors does the NLG have, for indication and the air ground system?

Answer 20

4

Question 21

How are the main and nose gear unlocked during a manual extension?

Answer 21

You pull a handle which unlocks the uplock mechanism and gravity then takes over.

Question 22

The landing manual gear extension handle compartment door has a switch, what
is its purpose?

Answer 22

Sends a signal to the manual extend solenoid valve in the gear selector valve, will move a valve that connects all components for normal extension and retraction to hydraulic return.

Question 23

Where is the Nitrogen valve on the MLG and NLG?

Answer 23

Inboard on the MLG and aft for NLG.

Question 24

Where is the oil valve?

Answer 24

Front face of the shock strut

Question 25

How many positions on the landing gear spool valve?

Answer 25

3 positions

Question 26

How are the MLG kept up and locked?

Answer 26

Uplock mechanism

Question 27

Where do we keep the spare seals?

Answer 27

Strut assembly

Question 28

How many valves does the anti-skid system use

Answer 28

4

Question 30

What does skid shoe do

Answer 30

Indication/protection from tail skid

Question 31

What does the frangible cartridge do?

Answer 31

Compresses during tail skid protecting the airframe.