CRJ CBT #56 Landing Gear

Question 1

Where can you find the landing gear and anti-skid system?

Answer 1

Central Panel

Question 2

How is the nosewheel steering system controlled?

Answer 2

Through the rudder pedals and the tiller

Question 3

Where are landing gear indications displayed?

Answer 3

Extension/Retraction is shown on the PFD

Brake temp is monitored on the status page while brake press is monitored on the hyd synoptic page

Question 4

How does the Proximity Sensing system work?

Answer 4

Uses PSEU and sensors

Double channel system that recieves position inputs from a number of proximity sensors and microswitches

PSEU controls sequencing of the landing gear, and the nose doors

PSEU provides airplane config data to various aircraft systems and monitors the status of aircraft doors and position of the ground spoilers

Question 5

Which Hyd Sys is used to extend and retract the Gear?

Answer 5

Hydraulic System 3

(Hyd Sys 2 is used to assist in alternate gear extension)

Question 6

What holds the main gear in the retracted position?

Answer 6

Uplock assembly

Question 7

What are the trigger conditions for the landing gear warning horn?

Answer 7

At least one thrust lever at idle

Speed

Flap setting

Question 8

How do you use the Main Landing Gear Emergency Extension?

Answer 8

There is a pedestal mounted MANUAL RELEASE handle provided for gravity extension

Question 9

What locks the Main landing gear in the down position in an emergency extension?

Answer 9

Hyd Sys 2

Question 10

What is the way to prevent inadvertent gear retraction during prolonged ground operations?

Answer 10

A locking pin can be inserted into each landing gear

Question 11

When hyd sys 3 is pressurized, the fwd doors can be opened and close by the ______ ______ ______ located on the external service panel

Answer 11

NOSE DOOR switch

Question 12

How is the nosewheel steering system operated?

Answer 12

Steer by wire system

Rudder Pedals are sensed by transducers and transmitted to an ECU

Control outputs from ECU are fed to an electro-hydraulic servo valve, which directs the fluid from Hyd Sys 3 to two steering actuators on the nose oleo

Question 13

What are the two options for NW steering?

Answer 13

Armed: Steer By wire

OFF: Free castoring mode

Question 14

What are the degrees of rotation for the ARMED mode?

Answer 14

70^o Tiller

5^o Rudder

Question 15

What are the degrees of rotation for the NW steering OFF position?

Answer 15

70^o with diff braking and thrust