LANDING GEAR

Question 1

Describe the OFF position of the landing gear?

Answer 1

Landing gear hydraulic system is depressurized.

FCOM, VOL 2; 14.10.1

Question 2

How many degrees can the nose‐wheel steering system turn the nose gear
with the tiller, and how many degrees with the rudder pedals?

Answer 2

•70 degrees in either direction with the tiller
•7 degrees with the rudder pedals

FCOM, VOL 2; 14.10.2, and 14.10.3

Question 3

What does the BRAKE SOURCE amber light indicate when illuminated?

Answer 3

Active brake hydraulic sources (hydraulic systems 4, 1, and 2)
have low pressure

FCOM, VOL 2; 14.10.5

Question 4

How are the landing gear held in position after retraction?

Answer 4

•Main gear are held in the up position by uplocks
•The nose gear is mechanically locked in the up position

FCOM, VOL 2; 14.20.2

Question 5

When does RTO apply maximum braking?

Answer 5

•Airplane on the ground
•Wheel speed above 85 knots
•Thrust levers are closed

FCOM, VOL 2; 14.10.4

Question 6

What is the purpose of the brake accumulator?

Answer 6

Provides for parking brake application

FCOM, VOL 2; 14.20.4

Question 7

What does a white, crosshatched, expanded gear position indication mean?

Answer 7

Related landing gear in transit

FCOM, VOL 2; 14.10.7

Question 8

What conditions must be satisfied in order for the landing gear lever lock to release?

Answer 8

•Main gear are tilted
•Body gear centered

FCOM, VOL 2; 14.20.2

Question 9

What hydraulic system pressurizes the brake accumulator?

Answer 9

•System 4

FCOM, VOL 2; 14.20.6

Question 10

What value on the brake temperature monitoring system causes the BRAKE TEMP Advisory EICAS message to appear?

Answer 10

5

FCOM, VOL 2; 14.30.2

Question 11

How does the landing gear extend with the alternate gear extension system?

Answer 11

• By pushing the alternate gear extend switches the gear uplocks and door
  latches are electrically released and the gear free‐falls.
• Gravity and airloads extend the gear
• Springs pull the downlocks into the
  locked position

FCOM VOL 2; 14.20.2

Question 12

Why is it necessary to pressurize hydraulic system 4 before pressurizing the other systems?

Answer 12

Precludes the transfer of hydraulic fluid from system 1 or 2 into system 4.
When the parking brake is set, and then released, brake hydraulic return
lines dump into system 4.

FCOM, VOL 2; 14.20.6

Question 13

What does an EICAS message LIMITER indicate?

Answer 13

•Brake torque limiter failure on more than one wheel per truck
•The parking brake lever is released and the parking brake valve is not fully open
•Brake system control unit power loss occurs

FCOM, VOL 2, 14.30.1, 747-8; 14.20.4