Landing Gear and Brakes

Question 1

How are the Landing gear operated?

Answer 1

• Electrically Commanded
• Hydraulically Actuated

Question 2

When will the aural warnign for the landing gear sound?

Answer 2

• Gear not down and locked AND
• < 700ft RA and low TLA

OR

• Any alttitude with flaps set > 5

Question 3

Can the aural warning be silenced by pushing the

“LG WRN INHIB” button?

Answer 3

Only if both Radio Altimeters have failed

Question 4

What are the three landing gear extension modes?

Answer 4

• Normal:………………….LG lever Down
• Electric override:…..Bypasses PSEM to directly command selector valve
• Alt gear Ext:……………Manually release uplock for freefall extension sequence

Question 5

What is the purpose of the “DN LOCK RLS”

button on the landing gear lever?

Question 6

What keeps the gear locked into position?

Question 7

Describe the landing gear indications:

Answer 7

Green:

• Down and Locked

White:

• Up and Locked

Amber:

• In transit

Red:

• Gear position and Lever Disagree (20sec grace period)

Question 8

How do the landing gear doors actuate?

Answer 8

Mechanically

Question 9

How are the brakes commanded?

Question 10

What hydraulic systems provide braking pressure?

Answer 10

• HYD 1 - Outboard Brakes
• HYD 2 - Inboard Brakes
• HYD 1 and 2 - Parking/Emergency Brake

Question 11

What protections are provided for braking?

Question 12

How many parking/emergency brake applications

will the accumulators provide?

Answer 12

Approximately 6

Question 13

What stops wheel rotation after retraction?

Answer 13

Main Gear:

• BCN applies brakes after weight off wheels

Nose Gear:

• Snubbers in nose bay

Question 14

What hydraulic system controls nosewheel steering?

Answer 14

HYD 2

Question 15

What are the nosewheel steering limits?

Answer 15

Up to 40kts : 76 degrees

41 to 100 kts : Linear decrease from 76 to 7 degrees