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Flashcards in Landing Gear and Brakes Deck (15):
1

How is the landing gear extended and retracted?

Electronically commanded and hydraulically actuated

2

When will the aural warning for the landing gear sound?

-If the gear is not down and locked, and
-5

3

Can the landing gear aural warning be silenced by pushing the 'LG WRN INHIBIT' button?

Only is both Radio Altimeters have failed

4

What are the 3 Landing Gear extension modes?

-Normal - LG lever Down
-Electric Override - Bypasses PSEM to directly command selector valve
-Alternate Gear Extension - Manual uplock release opens free-fall sequencing valve

5

What is the purpose of the DN LOCK RLS button the landing gear lever?

-Mechanically releases the landing gear lever lock
-Lock protects against inadvertent landing gear retraction when WOW

6

What keeps the gear in the locked position?

-Extended - Down lock springs
-Retracted - Uplock hooks

7

Describe the Landing gear indications

-Green - Down and Locked
-White - Up and locked
-Amber - In transit
Red - Gear position and lever disagreement (20sec grace period)

8

How do the landing gear doors actuate?

Mechanically, during landing gear extension or retraction

9

How are the brakes commanded?

-Brake by Wire
-Electrically commanded and hydraulically actuated
-Pedal position transducers send brake requests to the BCM (Brake Control Module)

10

What Hydraulic system(s) provide brake pressure?

-HYD 1 - Outboard brakes
-HYD 2 - Inboard brakes
-HYD 3 - Parking/Emergency Brake

11

What protections are provided for braking?

-Touchdown - No braking until 3 seconds or >50kts wheel speed after touchdown
-Anti-skid - Compares wheel speeds and releases pressure (inop

12

How many applications will the parking/emergency brake provide?

6 applications

13

What stops the wheels from spinning during retraction?

-Main - BCM applies brakes after Weight off Wheels
-Nose - Snubbers in the nose bay stop the wheels

14

Which HYD System controls the nosewheel steering

HYD 2

15

What are the limits for the nosewheel steering?

-Angle varies with ground speed
-Up to 40kts +76°
-41 to 100kts Decreases linearly from 76° to 7°