14 - Landing Gear

Question 1

Tiller steering angle?

Rudder pedal steering angle?

Answer 1

• 70 deg (main gear aft axel steering slaved to nose wheel steering)(enabled when >13 deg, turns in opposite direction)
• 7 deg (does not activate main gear steering)

Question 2

What does Brake Source Light indicate?

Answer 2

Both R and C/reserve sources have low pressure

Question 3

When does the Brake Symbol box turn solid amber?

Answer 3

5.0

Question 4

How is Landing Gear held in up position? When is system depressurized?

Answer 4

Uplocks

After gear retracted and all doors are closed, system is automatically depressurized

Question 5

What happens when the gear lever is moved to down?

Answer 5

Landing gear doors open, the gear are unlocked and the gear free-falls without hydraulic power to the down and locked position. The downlocks are powered to the locked position, all hydraulically actuated gear doors close, and the main gear trucks hydraulically tilt to the flight position

Question 6

How many Braces on each gear?

Answer 6

Nose - Drag Brace

Main - Drag Brace and Side Brace

Question 7

How is gear alternately extended?

Answer 7

Dedicated DC powered electric hydraulic pump and C system fluid releases all door and gear uplocks. Gear then freefalls to down and locked

Question 8

What is SLG and how does it work?

Answer 8

Semi-Lever Gear

Hydraulic actuator connects the forward end of each main gear to the shock strut.

TO: actuator locks, A/C rotates about the aft wheel axle

Lndg: dampens landing loads

Question 9

What is the purpose of the brake accumulator and what system is it located in?

Answer 9

• extends parking brake holding time
• stabilizes normal brake pressure during initial application and antiskid cycling
• supplies pressure for several braking applications or to set parking brake if C/R system pressure is lost.

Question 10

What is the source of reserve alternate brakes and nose wheel steering?

Answer 10

Fluid below C reservoir standpipe used by C1 primary pump

Question 11

When is RTO activated?

Answer 11

• ground speed above 85 kts
• both thrust levers are retarded to idle

Question 12

What wheel groups have antiskid protection in Normal/Alternate? Is antiskid provided when pressure is provided only from the brake accumulator?

Answer 12

Normal - individual wheel

Alternate - tandem wheel pairs (forward and mid axels), aft axel - individual wheels

Yes

Question 13

What is Taxi Brake Release and how/when does it work?

Answer 13

Less than 45 kts; antiskid releases brakes on axel pair of each main gear during each brake application. Only in normal