Operate Landing Gear and Brake

Question 1

What type of brakes does the ERJ have?

Answer 1

The brake system employs brake-by-wire rudder pedals located at both pilot stations.

Question 2

How are the brakes activated?

Answer 2

Feet (rudder pedals), Hands (Emergency/parking brake handle), Automatically (Autobrakes)

Question 3

What is the difference between HI and RTO?

Answer 3

RTO is a takeoff setting and Lo/Med/Hi are landing settings.

RTO automatically applies maximum braking during a rejected takeoff and HI automatically applies high (not maximum) braking on landing.

HI applies brakes 2 seconds after weight on wheels. Applies brakes to slow the airplane about 8 knots per second (or 0.41 G’s).

Question 4

What conditions must be met for the autobrakes to be ARMED to RTO?

Answer 4

The autobrake system can only be armed if the normal brake system is operational. Antiskid, touchdown and locked wheel protections are provided during autobrake operation.

Selector Knob Position: RTO
WOW Indication: On ground
Wheel Speed: Below 60 kt
Brake Control System: No faults
Brake Pedal Position: Any
Thrust Levers Position: Idle or REV

Question 5

What conditions must be met for the autobrakes to be APPLIED in RTO?

Answer 5

Condition Armed
Selector Knob Position: RTO
WOW Indication: On ground
Wheel Speed: Above 60 kt
Brake Control System: No faults
Brake Pedal Position: Not pressed
Thrust Levers Position: Idle or REV

Question 6

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

Answer 6

Landing and RTO modes will be disarmed if one of the following conditions occurs:
-The selector switch is set to the OFF position
-Pedal braking is applied (while wheel speed is above 60 kt if RTO is selected)
-Brake control system failure is detected (while wheel speed is below 60 kt if RTO is selected)
-Either thrust lever is advanced beyond idle during autobrake application

AOM 14-13-20 for chart
Autobrake will be disarmed if the following conditions are met: LANDING MODE
Selector Knob Position: OFF or RTO
Wow Indication: -
Brake Control System: Faults detected
Brake Pedal Position: Pressed (more than 20%)
Thrust Levers Position: Above idle while Autobrake is being applied

Autobrake will be disarmed if the following conditions are met: REJECTED TAKEOFF MODE
Selector Knob Position: OFF, LO, MED or HI
Wow Indication: In flight
Brake Control System: Faults detected below 60 kt of wheel speed
Brake Pedal Position: Pressed while Autobrake is being applied
Thrust Levers Position: Above idle while Autobrake is being applied

Question 7

How many ways are there to raise the landing gear?

Answer 7

*Check this

1. Raising the landing gear lever releases hydraulic pressure for the nose and main landing gear locks and pressurizes the respective actuators to retract the gear.

Question 8

When would someone use the DN LOCK REL button? What does this do?

Answer 8

Downlock release: only use it if you need the gear up to clear obstacles

Question 9

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

Answer 9

3 ways to lower landing gear

1. Normal Gear Extension
2. Electrical Override Extension (QRH..NAP)
3. Alternate Gear Extension (if hydraulic pressure is not available or the electrical system fails)

Question 10

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

Answer 10

*Ask

Question 11

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

Answer 11

A discrepancy between the position of the landing gear control lever and at least one landing gear is detected.

Question 12

What criteria must be met for the autobrake to be armed to low, medium, or high?

Answer 12

Autobrake will be armed if the following conditions are met: LANDING MODE
Selector Knob Position: Lo, Med, or Hi
Wow Indication: In flight
Wheel Speed: Below 60 kt
Brake Control System: No faults
Brake Pedal Position: Not pressed
Thrust Levers Position: Any

Question 13

What can be done to disarm the autobrake from low, medium, or high?

Answer 13

Autobrake will be disarmed if the following conditions are met: REJECTED TAKEOFF MODE
Selector Knob Position: OFF, LO, MED or HI
Wow Indication: In flight
Brake Control System: Faults detected below 60 kt of wheel speed
Brake Pedal Position: Pressed while Autobrake is being applied
Thrust Levers Position: Above idle while Autobrake is being applied

Question 14

Describe the following brake protection:
Automatic wheel braking

Answer 14

Automatic wheel braking prevents the main landing gear from being retracted with the wheels spinning.

A dedicated device inside the nose landing gear bay stops the nose landing gear wheels from spinning.

Question 15

Describe the following brake protection:
Touchdown protection

Answer 15

Touchdown protection prevents the airplane from touching down with the main landing gear brakes applied.

It is deactivated:
-Three seconds after WOW has sensed the ground; or
-When the wheel speed is above 50kt

Question 16

Describe the following brake protection:
Locked wheel protection

Answer 16

Locked wheel protection is active anytime on ground and at wheel speeds above 30 kt. The brake control commands the relief of hydraulic pressure when a wheel is detected to be locked, maximizing the brake efficiency. The logic does not affect the differential braking for steering purposes.