Landing Gear

Question 1

How many air ground sensors are there?

Answer 1

6. 2 on each landing gear

Question 2

What computers are the air ground sensors attached to

Answer 2

PSEU

Question 3

What indication will you receive if there is a problem with the air ground relays?

Answer 3

The PSEU light on the overhead panel will illuminate

Question 4

When will the red GEAR lights illuminate?

Answer 4

When in disagreement with the gear lever position (in transit)

OR

Landing Gear is NOT down and locked with either thrust lever at IDLE AND AC below 800 ft AGL

Question 5

When will the gear warning horn activate

Answer 5

1. Anytime FLAPS greater than 25
2. BOTH engines on and low thrust
   - FLAP 0-10: below 800 AGL
   - FLAPS 15-25: always

Question 6

When will the gear warning horn activate during single engine operation?

Answer 6

Same conditions as normal operation except thrust lever position less than 34 degrees

Question 7

What system powers landing gear retraction?

Answer 7

Hydraulic system A

Question 8

How are the gears held in place?

Answer 8

Mechanically with uplocks

Question 9

What protection exists for a broken tire being retracted into the wheel well?

Answer 9

Loose tread will impact a fitting near the opening. That fitting, when broken will release hydraulic pressure causing the gear assembly to free fall back to the down position.

Question 10

What is the purpose of Hudraulic System B in regards to the landing gear system?

Answer 10

Alternate Source of Hydraulic power for gear retraction.

Question 11

What would cause Hydraulic system B to activate for gear retraction?

Answer 11

Left engine failure after V1 and before gear retraction.

Question 12

How does Hydraulic System B take over gear retraction?

Answer 12

A Landing Gear Transfer Unit controls the source of hydraulic pressure by movement of a selector valve

Question 13

What conditions must exist for Hydraulic System B to raise the landing gear?

Answer 13

1. In flight
2. No 1 engine N1 drops
3. GEAR lever UP
   Either MLG is NOT up

Question 14

How is the gear lowered?

Answer 14

Hydraulic System A pressure releases the up locks.

Question 15

How is the gear held in the down and locked position

Answer 15

Over center mechanical and hydraulic locks

Question 16

How is the gear held in the down and locked position

Answer 16

Over center mechanical and hydraulic locks

Question 17

What is the alternate means of extending the landing gear?

Answer 17

Manual Gear Extension handles in the cockpit

Question 18

How do the Manual Gear Extension handles operate

Answer 18

When pulled by a pilot, the uplocks release and the gear free falls into the down and locked position.

Once pulled, the gear cannot be retracted.

Question 19

How is the nosewheel steering normally powered?

Answer 19

Hydraulic System A

Question 20

When is the nosewheel steering powered by hydraulic system B?

Answer 20

When the switch is placed into alternate mode?

Question 21

What is the range of motion on the nosewheel tiller?

Answer 21

78 degrees

Question 22

What is the range of motion on the rudder pedals?

Answer 22

7 degrees

Question 23

Ground crew says “bypass pin installed”. What does that mean?

Answer 23

They are referring to the lockout pin which is installed during pushback to allow them to rotate the nosewheel without the need to depressurize the hydraulic system. It MUST be removed prior to taxi.

Question 24

How are the brakes normally powered?

Answer 24

Hydraulic System B

Question 25

What is the alternate source of brake pressure?

Answer 25

Hydraulic system A

Question 26

When the brakes are being powered by the alternate source, what components are inoperative if any?

Answer 26

Auto Brakes are INOP

Question 27

Should both hydraulic systems be lost, what if any braking capability still exists?

Answer 27

Brake Accumulator pressure can provide several braking applications OR ONE application of the parking brake

Question 28

What hydraulic system powers the accumulator?

Answer 28

Hydraulic system B

Question 29

What is the normal and max pressure of the braking system?

Answer 29

3000psi is normal
3500psi is maximum

Question 30

ANTI SKID light is illuminated. What other systems are compromised?

Answer 30

Auto Brake

Question 31

When is the Auto Brake system disarmed? (AUTO BRAKE DISARM)

Answer 31

1. Selector OFF
2. Landing with RTO selected
3. Malfunction detected
4. Manual Braking/Thrust advanced after RTO
5. Spoilers DOWN after RTO/landing

Question 32

When is the Auto Brake system disarmed? (AUTO BRAKE DISARM)

Answer 32

1. Selector OFF
2. Landing with RTO selected
3. Malfunction detected
4. Manual Braking/Thrust advanced after RTO
5. Spoilers DOWN after RTO/landing

Question 33

Why does the AUTO BRAKE DISARM light illuminate after selecting RTO

Answer 33

The system accomplishes a self test. Illumination for roughly 2 seconds and extinguishing is a signal the test was conducted and completed satisfactorily

Question 34

Why does the AUTO BRAKE DISARM light illuminate after selecting RTO

Answer 34

The system accomplishes a self test. Illumination for roughly 2 seconds and extinguishing is a signal the test was conducted and completed satisfactorily

Question 35

When does RTO activate on takeoff?

Answer 35

Over 90 knots and thrust levers idle

Auto braking is not activated if RTO below 90 knots