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Embraer 190 Memory Items > Landing Gear and Brakes > Flashcards

Landing Gear and Brakes Flashcards

1
Q

When is touch down protection de-activated?

A

Three seconds after WOW has sensed the ground; or When wheel speed is above 50 kt. (B12 14-13-20 Pg 2)

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2
Q

How many full brake applications does the
emergency brake accumulator provide?

A

The accumulators have sufficient pressure to provide six full-brake applications. (B12 14-13-20 Pg 2)

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3
Q

When does locked wheel protection become active?

A

Active anytime on the ground and the wheel speed is above 30kt (B12 I14-13-20 Pg 1)

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4
Q

How many uplock sensors are there?

A

Each landing gear has 2 uplock and 2 downlock sensors. In the event of a discrepancy between both uplock or downlock sensors of the same
landing gear, the sensor in agreement with the landing gear lever position will be considered valid. (B12 14-13-15 Pg 3)

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5
Q

What is automatic wheel braking?

A

Automatic wheel braking prevents the main landing gear from being retracted with the wheels spinning. (B12 14-13-20 Pg 2)

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6
Q

How is alternate gear extension achieved?

A

If hydraulic pressure is not available for landing gear operation or the electrical system fails, landing gear extension is performed by the alternate gear extension lever. Pulling up the alternate gear lever releases residual hydraulic pressure in the landing gear lines and opens all landing gear uplocks. The landing gear extends in a free fall with the aid of gravitational and aerodynamic forces. B12 14-13-15 Pg 1)

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7
Q

Below ~hat speed is the anti-skid system deactivated?

A

For wheel speeds below 10 kt, the anti-skid protection is deactivated, thus allowing the pilot to lock and pivot on a wheel for manoeuvring. (B12 14-13-20 Pg 2)

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8
Q

How do the ground personnel know when it is safe to tow the aircraft?

A

Green Towing Light on Nose Landing Gear leg indicates:

  • Steering disengaged through the external steering disengage switch and
  • Parking brakes not applied and
  • Main brakes not applied.
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9
Q

How long after selecting the gear down would you receive a disagreement indication if one leg did not lock down?

A

DISAGREEMENT: the indication changes from its previous color to red 20 seconds after the discrepancy is detected. (81214-13-05 Pg 5)

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10
Q

What must be done to re-engage the nose wheel steering on the flight deck after disengagement?

A

To engage the nose wheel steering system:
The hydraulic system 2 needs to be pressurized.

The external steering disengage switch must be in the engaged position.

The handwheel steering must be pressed and released for rudder pedal steering or kept pressed for handwheel steering.

I (B1214-13-25 Pg 1)

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11
Q

What type of landing gear does the aircraft have?

A

The aircraft has a tricycle landing gear configuration with telescopic struts, incorporating two wheels per leg.

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12
Q

How are the landing gear controlled and operated?

A

The landing gear is electronically controlled and hydraulically operated.

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13
Q

Which hydraulic systems power the landing gear?

A

Hydraulic System 1: Provides braking for the outboard wheels.
Hydraulic System 2: Powers nose wheel steering, gear retraction/extension, and braking for the inboard wheels.

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14
Q

What are the three landing gear operating modes?

A

Normal Mode: Electronically controlled and hydraulically operated.
Electrical Override Mode: Electronically controlled without input from PSEMs.
Alternate Extension Mode: Mechanically powered gravity extension with uplocks released.

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15
Q

What does the Proximity Sensor Electronic Module (PSEM) do?

A

PSEM:
Monitors gear uplock/downlock sensors,
Controls extension/retraction,
Manages air/ground system inputs from weight-on-wheel (WOW) sensors.

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16
Q

How is the alternate extension mode activated?

A

By lifting the alternate gear lever to release the uplocks, allowing gravity extension.

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17
Q

What are the EICAS messages related to landing gear faults?

A

LG LEVER DISAG: Disagreement between the gear lever and actual gear position after 20 seconds.
LG NOSE DOOR OPEN: Nose gear doors fail to close after deployment/retraction.

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18
Q

How does the landing gear warning system function?

A

Provides aural warnings based on thrust lever angle, flap position, and radio altitude.

Cannot be silenced if flaps are in position 5 or FULL.

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19
Q

What type of brakes does the aircraft use?

A

The aircraft has electronically controlled, hydraulically powered carbon composite brakes.

20
Q

What hydraulic systems power the brakes?

A

Hydraulic System 1: Outboard brakes.
Hydraulic System 2: Inboard brakes.

21
Q

What protections are offered by the brake system?

A

Anti-Skid Protection: Compares wheel speeds to prevent skidding.
Touchdown Protection: Prevents braking until 3 seconds after WOW or above 50 knots.
Locked Wheel Protection: Reduces brake pressure if one wheel’s speed is 33% lower than its pair’s speed.

22
Q

What is the function of the Brake Control Modules (BCMs)?

A

BCMs monitor wheel speed, regulate hydraulic pressure, and provide braking commands.

23
Q

What is the Emergency Park Brake, and how is it powered?

A

The Emergency Park Brake provides braking via hydraulic accumulators in the event of hydraulic failure, allowing up to six brake applications.

24
Q

What are the auto brake system modes?

A

RTO (Rejected Takeoff): Activates automatically if speed >60 knots, thrust levers are idle or reverse, and no manual braking is applied.
Low/Med/High: Applies brake pressure depending on deceleration settings during landing.

25
Q

What conditions disarm the auto brake system?

A

The auto brake system is disarmed if:
The selector is set to OFF,
Brake pedals are pressed,
A system failure occurs,
Either thrust lever is advanced beyond idle.

26
Q

What are the indications of brake overheating?

A

EICAS displays ‘Brake Overheat.’
Temperature indications on the MFD:
Green: 251°C or below,
Amber: 252°C–850°C,
Amber Dashed: Sensor failure or temperature out of range.

27
Q

How does the parking brake function?

A

Mechanically locks the brake lever in position, allowing braking even if hydraulic pressure is lost.
Prevents brake application in flight (EICAS ‘Park Brake Not Applied’).

28
Q

What are the functions of the fusible plugs in the wheels?

A

Fusible plugs melt during excessive overheating, releasing tire pressure to prevent explosion.

29
Q

How does nose wheel steering (NWS) operate?

A

Powered by Hydraulic System 2,
Electronically controlled and hydraulically operated,
Allows steering via the hand wheel for low speeds and rudder pedals for high speeds.

30
Q

What are the NWS operational modes?

A

Active Mode: NWS is controlled by the hand wheel or rudder pedals when on the ground.
Free Wheel Mode: NWS is unpressurized, allowing the nose wheel to caster freely for towing.

31
Q

How is the landing gear locked in place during extension?

A

The landing gear is locked in place by hydraulic actuators and held by downlock springs and drag braces.

32
Q

What is the function of the uplocks in the landing gear system?

A

Uplocks mechanically hold the gear in a retracted position until commanded for extension.

33
Q

What happens during landing gear extension in the alternate mode?

A

Uplocks are released mechanically. The gear free-falls into the extended position, aided by springs.

34
Q

What are the indicators on the EICAS for landing gear status?

A

Gear Down and Locked: Green.
Gear in Transit: Amber.
Gear Up and Locked: No indication.

35
Q

What does the EICAS message ‘LG LEVER DISAG’ indicate?

A

It indicates a disagreement between the landing gear lever position and the actual gear position after 20 seconds.

36
Q

How does the system prevent accidental retraction of landing gear on the ground?

A

A locking solenoid prevents gear retraction when weight-on-wheels (WOW) sensors indicate the aircraft is on the ground.

37
Q

What redundancy exists in the landing gear system?

A

The system uses hydraulic redundancy with two systems (1 & 2) and an alternate mechanical extension mode to ensure functionality during failures.

38
Q

How many BCMs (Brake Control Modules) are there, and what are their functions?

A

There are two BCMs that: Monitor wheel speeds, Regulate hydraulic pressure for braking, Manage anti-skid and locked-wheel protection.

39
Q

What is the purpose of touchdown protection in the braking system?

A

It prevents brake application until 3 seconds after weight-on-wheels (WOW) or above 50 knots, avoiding damage during touchdown.

40
Q

How does the locked wheel protection feature work?

A

If one wheel’s speed drops below 33% of its paired wheel’s speed (at >30 knots), brake pressure to the slower wheel is reduced to prevent skidding.

41
Q

What are the conditions for RTO (Rejected Takeoff) autobrake activation?

A

RTO activates when: Speed exceeds 60 knots, Both thrust levers are idle or in reverse, No manual braking is applied.

42
Q

What is the Emergency Park Brake, and how does it function?

A

The Emergency Park Brake uses hydraulic accumulators to provide braking when main hydraulic pressure is lost. It allows up to six brake applications and locks mechanically when engaged.

43
Q

What EICAS messages indicate brake-related issues?

A

‘Brake Overheat’: Temperature exceeds normal range. ‘Park Brake Not Applied’: Prevents brake application during flight. ‘LG Temp Exceedance’: Temperature above 750°C, cleared only after power-down.

44
Q

What safety feature prevents wheel overheating during braking?

A

Fusible plugs in the wheels release tire pressure to prevent explosion due to excessive heat.

45
Q

What are the MFD brake temperature indication ranges?

A

Green: Below 251°C. Amber: Between 252–850°C. Amber Dashed: Sensor failure or temperature out of range.

Embraer 190 Memory Items (21 decks)

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