LANDING GEAR

Question 1

How is main gear steering achived?

Answer 1

Main gear aft truck is steerable automatically. Operates when the nose wheel steering angle is over 13 deg to reduce tire scrubbing

Question 2

Max speed for gear extension and retraction?

Answer 2

270 kts or M 0,82

Question 3

How many tires does the B777 have?

Answer 3

14

Question 4

Which HYD system is used for normal braking?

Answer 4

The right HYD system

Question 5

Which HYD systems supplies the steering systems?

Answer 5

Center/RSV for the nose Wheel

Center for the main gear aft axle steering

Question 6

What HYD system is used for alternate and reserve braking?

Answer 6

Centre HYD system

Question 7

Is anti-skid available with the Center HYD system?

Answer 7

Yes

Question 8

In which braking modes is anti-skid available?

Answer 8

Normal
Alternate
Reserve
Accumulator only

Question 9

Where are the air/ground logic sensors located?

Answer 9

On each main landing gear beam

Question 10

When is the lever lock normally released?

Answer 10

Once airborne

Question 11

Why is there no OFF selection for the landing gear lever?

Answer 11

Because the system is automatically depressurized

Question 12

How can the ground landing gear lever lock be manually overridden?

Answer 12

By pushing and holding the landing gear lever LOCK OVERRIDE switch

Question 13

What is the non normal format to display gear extension on EICAS?

Answer 13

EICAS displays the locked/transit status of each gear

Question 14

How does the landing gear extend?

Answer 14

HYD pressure unlocks mechanical locks and then the gears free fall

Question 15

How is the main gear locked down?

Answer 15

By downlocks hydraulically

Question 16

How many braces are on each main landing gear?

Answer 16

2. A drag brace and a side brace

Question 17

What type of pump is used for alternate gear extension?

Answer 17

A dedicated DC powered hydraulic pump using Center HYD system fluid

Question 18

How is alternate gear extension done?

Answer 18

Select down on ALT GEAR switch but first put the gear lever in the down position

Question 19

How are the gear doors affected by alternate gear extension?

Answer 19

All the hydraullically powered doors remain open

Question 20

Which HYD system Powers the nose gear steering?

Answer 20

Centre and Reserve system

Question 21

Is the nose steering system available with Centre/RSV hydraulics?

Answer 21

Yes

Question 22

What is the max steering angle with the tiller?

Answer 22

70 deg

Question 23

What is the max steering angle with rudder pedals?

Answer 23

7 deg

Question 24

Will the main gear operate with rudder pedal steering?

Answer 24

No, Operates over 13 deg. Pedals can only give 7 deg

Question 25

Which hydraulic system gives pressure for reserve braking?

Answer 25

The primary C1 pump

Question 26

What is indicated by the BRAKE SOURCE light and EICAS message?

Answer 26

Both Right and Center/RSV HYD pressure is low

Question 27

Which HYD system pressurizes the brake accumulator?

Answer 27

The right HYD system

Question 28

When is the brake accumulator charged hydraulically?

Answer 28

Stores pressure if Right HYD system pressure is lost

Question 29

When is anti-skid available?

Answer 29

With normal and alternate system. In all braking modes

Question 30

In regard to anti-skid, which Wheels are individually controlled?

Answer 30

The aft axle Wheels.

Question 31

In which braking modes is autobrake available?

Answer 31

Only in Normal mode

Question 32

When will autobrake function for a rejected T/O?

Answer 32

Over 85 kts. Both thrust levers must have been retarded to idle to engage. Arming of RTO is only possible on the ground

Question 33

Will autobrake bring the a/c to a complete stop?

Answer 33

Yes

Question 34

What does the EICAS msg AUTOBRAKE indicate?

Answer 34

The autobrake system has disarmed

Question 35

How is the Park brake set?

Answer 35

Depress both pedals, pull PB lever up, then release pedals

Question 36

What temp will display BRAKE TEMP message?

Answer 36

When any brake temå is at or above 5,0 (500 deg C)

Question 37

What 3 situations will cause the TIRE PRESSURE msg on the EICAS?

Answer 37

1. Any tire press is above normal range 2. Any tire press is below the normal range 3. Excessive pressure diff between 2 tires on the same axle