Subtask 10.1.8 Operate Landing Gear and Brakes

Question 1

What type of brakes does the ERJ have?

Answer 1

Carbon brakes

Question 2

How are the brakes activated?

Answer 2

Brake pedals, parking brake, autobrake

Question 3

What is the difference between HI and RTO?

Answer 3

HI is a landing mode and RTO is a takeoff mode (RTO is equivalent of standing on brakes, HI commands less force)

Question 4

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

Answer 4

Selector knob position
WOW indication (MLG)
Wheel Speed
Brake control system
Brake pedal position
Thrust lever position

RTO
On-ground
Below 60 kt
No faults
Any
Idle or REV

Question 5

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

Answer 5

Condition
Selector knob position
WOW indication (MLG)
Wheel Speed
Brake control system
Brake pedal position
Thrust lever position

ARMED
RTO
On-ground
Above 60 kt
No faults
Not pressed
Idle or REV

Question 6

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

Answer 6

Selector knob position
WOW indication (MLG)
Brake control system
Brake pedal position
Thrust lever position

OFF, LO, MED, or HI
In-flight
Faults detected below 60 kt wheel speed Pressed while autobrake is being applied Above idle while autobrake is applied

Question 7

How many ways are there to raise the landing gear?

Answer 7

1 way; Landing gear normal retraction

Question 8

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

Answer 8

The downlock release button mechanically bypasses the system protection logic. It should be used only in the event of a landing gear control lever failure or when it is necessary to clear obstacles

Question 9

How many ways are there to lower the landing gear?

Answer 9

3 ways; Landing gear normal extension, electrical override extension, alternate gear extension

Question 10

What component gives a green down indication on the EICAS?

Answer 10

Each landing gear has two downlock sensors. In event of discrepancy, the sensor in agreement with the landing gear lever will be considered valid.

Question 11

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

Answer 11

LG LEVER DISAG message is caused by uplock sensors that disagree with the position of the lever position

This message can be fixed by running the LG LEVER DISAG QRH procedure.

Question 12

What criteria must be met for the autobrake to be ARMED to LO, MED, or HI?

Answer 12

Selector knob position
WOW indication (MLG)
Wheel Speed
Brake control system
Brake pedal position
Thrust lever position

LO, MED, or HI
In-flight
Below 60 kt
No faults
Not pressed
Any

Question 13

What criteria must be met for the autobrake to be APPLIED to LO, MED, or HI?

Answer 13

Condition
Selector knob position
WOW indication (MLG)
Wheel Speed
Brake control system Brake pedal position Thrust lever position

ARMED
LO, MED, or HI
On-ground
Above 60 kt
No faults
Not pressed
Idle or REV

Question 14

What can be done to disarm the autobrake from LO, MED, or HI?

Answer 14

Selector knob position
WOW indication (MLG)
Brake control system
Brake pedal position
Thrust lever position

Faults detected
Pressed (>20%)
Above idle while autobrake is applied

Question 15

Describe the following brake protections; automatic wheel braking, touchdown protection, locked wheel protection.

Answer 15

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.

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

Locked Wheel protection- Active anytime on-ground and at wheel speeds above 30 kts. The system logic compares wheel speed signals between left and right inboard brakes or between the left and right outboard brakes. If a wheel is 33% or below its associated paired wheel speed, the brake control module commands zero pressure to the brake of the slower wheel, thus allowing speed equalization. The tolerance between wheel speeds is provided to permit differential braking, for steering purposes.

Anti-skid protection- Prevents tire skidding and maximizes brake efficiency according to runway surface. The system controls the amount of hydraulic pressure applied to the brakes and, if necessary, reduces the wheel brake pressure in order to recover wheel speed and prevent tire skidding. For wheel speeds below 10 kt, the anti-skid protection is deactivated, thus allowing the pilot to lock and pivot on a wheel for maneuvering. Anti-skid protection is not available for the emergency/parking brake system.