Landing gear

Question 1

How many tires does the B-777 have?

(FCOM 14.20.1)

Answer 1

14 (2 nose wheels, 12 mains)

Question 2

After landing, autobrake application begins when?

(FCOM 14.20.5)

Answer 2

• Both thrust levers are retarded to idle, AND
• The wheels have spun up

Question 3

What does the EICAS message BRAKE SOURCE indicate?

(FCOM 14.30.1)

Answer 3

Normal and alternate brake system pressures are low and reserve hydraulic source for alternate brake system is low.

Question 4

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

(FCOM 14.20.2)

Answer 4

Dedicated DC powered electric hydraulic pump and center hydraulic system fluid to extend gear. Hydraulics release uplocks to doors and gear simultaneously. Gear free falls. Doors stay open. GEAR DOOR EICAS is displayed with expanded gear synoptic.

Question 5

What is the maximum speed at which the gear can be operated?

(FCOM 14.10.1)

Answer 5

270kts/M.82 to extend/retract.

Question 6

When does RTO autobrake setting command maximum braking pressure?

(FCOM 14.20.5)

Answer 6

• Groundspeed above 85 kts, AND
• Both thrust levers to idle

Question 7

What does a white hashed box displayed on the EICAS gear position indicator mean?

(FCOM 14.10.5)

Answer 7

Gear in transit.

Question 8

How long does the gear UP indication remain displayed on the EICAS?

(FCOM 14.10.5)

Answer 8

10 seconds.

Question 9

Main gear steering automatically operates when?

(FCOM 14.20.3)

Answer 9

When the nose wheel steering angle exceeds 13 degrees to reduce tire scrubbing.

Question 10

What does the Taxi Brake Release system do?

(FCOM 14.20.5)

Answer 10

• Alternatively applies braking to all 3 pairs of main gear to reduce brake applications on each brake
• Active below 45 knots