Landing Gear and Brakes

Question 1

How many ways can you activate the brakes?

Answer 1

3 ways Feet, Hands, Automatically

Question 2

What is the difference between HI and RTO?

Answer 2

HI- 4m/s deceleration

RTO - Maximum deceleration

Question 3

Will the plane stop in the same distance with Autobrakes and Thrust Reverser and No Thrust Reverser?

Answer 3

Yes, the thrust reverser just takes some of the work away from the brakes. Auto Brakes are just a deceleration rate

Question 4

What gives a green light to the pushback crew?

Answer 4

Steering OFF Brakes released Nose Gear Towing light is green

Question 5

How many ways to disconnect nose wheel steering?

Answer 5

Hydraulic system 2 fail
Steering disconnect switch
External Steering Switch Off

Question 6

What conditions must be met for the auto brakes to be ARMED to RTO?

Answer 6

Selector Knob Position - RTO

Weight on Wheels

Wheel Speed Below 60 knts

No Faults

Any Brake Pedal Position

Thrust levers at Idle or REV

Question 7

What conditions must be met for RTO to recognize a reject?

Answer 7

Selector Knob - RTO

Weight on Wheels

Wheel speed above 60 knots

No Faults

Brakes not pressed

Thrust levers at Idle or REV

Question 8

What conditions must be met for the auto brakes to be DISARMED from RTO?

Answer 8

Selector Knob - Not in RTO

In Flight

Faults detected below 60knots of wheel speed

20% Brake pressure applied

Thrust levers > idle

Question 9

What releases the autobrakes?

Answer 9

20% brake pressure applied System faults
Thrust levers > idle

Question 10

When would you press the DN LOCK REL button?

Answer 10

When you need the gear up to clear obstacles

Question 11

How many ways are there to lower the landing gear? What are they?

Answer 11

3, landing gear lever, alternate gear extension, and electrical override

Question 12

What does the electrical override switch do?

Answer 12

Electrically bypasses the sensors and evaluation computers and extends the gear

Question 13

What does the Alternate Gear Extension lever do?

Answer 13

If hydraulic pressure is not available it will release hydraulic pressure in the lines and mechanically releases all uplocks. Gear extends via gravity may be necessary to yaw to fully extend

Question 14

Systematically, what happens when the landing gear lever is selected up or down?

Answer 14

Selecting down releases hydraulic pressure for the nose and main uplocks as well as the retraction actuators. The landing gear doors are mechanically opened

Question 15

How does aircraft know to give a green down indication on the EICAS (what component verifies this signal)? What does amber and red mean?

Answer 15

The Proximity Sensor. Amber means wheels in transit. Red means gear disagree.

Question 16

What causes a LG LEVER DISAG message? How is this fixed?

Answer 16

When the Proximity Sensor Evaluation Module (PSEM) senses a wheel not locked down. We would use the electrical override to bypass the PSEM and commands the same extension sequence as normal operation.

Question 17

What causes a LG LEVER DISAG message? How is this fixed?

Answer 17

When the Proximity Sensor Evaluation Module (PSEM) senses a wheel not locked down. We would use the electrical override to bypass the PSEM and commands the same extension sequence as normal operation.

Question 18

What does the landing gear warning inhibit button do?

Answer 18

Inhibits the warning and aural warning in the event of dual RA failure only if the Slat/Flap lever is in the 0, 1, 2, 3, or 4 position

Question 19

What does the landing gear warning inhibit button do?

Answer 19

Inhibits the warning and aural warning in the event of dual radio altimeter failure only if the Slat/Flap lever is in the 0, 1, 2, 3, or 4 position

Question 20

When would someone use the DN LOCK REL button?

Answer 20

To raise the gear for terrain avoidance

Question 21

Steering limitations? Tiller pedal turn width

Answer 21

Pedals: 7 degrees left and right

Tiller: Up to 76 degrees

Minimum Turn Width: 59ft 2in

Minimum Taxiway Width: 50ft

Question 22

Describe the following brake protections: Automatic wheel braking

Answer 22

stops the main wheels during gear retraction

Question 23

Touchdown protection

Answer 23

only allows braking when wheel speed above 50 knots or 3 seconds after touchdown

Question 24

Locked wheel protection

Answer 24

prevents locked wheels by comparing inboard/outboard speeds if wheel speed is 33% or below the other wheel the brake pressure will be 0 on the slower wheel to speed the slower wheel up…active above 30 knots ▪ Anti-skid protection- prevents tire skidding and maximizes brake efficiency by reducing hydraulic pressure if necessary…active at 10knots or greater wheel speed

Question 25

Can the Emergency/Parking Brake be used to stop the aircraft after landing? When would a pilot need to do this? Considerations?

Answer 25

Yes, when hydraulic system 1 and 2 fails. Wheel protections are no longer available (auto wheel braking is still available)