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ERJ175 systems > Landing Gear and Brakes > Flashcards

Landing Gear and Brakes Flashcards

1
Q

Which hydraulic system controls the landing gear?

A

Hydraulic system #2

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2
Q

What releases the mechanical gear lever lock?

A

Weight off wheels (Airborne)

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3
Q

What happens when the gear selector lever is moved to the UP position?

A

Hydraulic pressure for the nose and main landing gear locks is released, and the respective actuators to retract the landing gear are pressurized.

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4
Q

What holds the landing gear in the UP position?

A

UPLOCKS (look like hooks) are hydraulically pressurized.

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5
Q

If the gear lever is locked in the down position, can the gear be raised?

A

Yes, by pressing the down lock release button.

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6
Q

When is it ok to use the DN LOCK REL button?

A

Only when directed by the QRH, or as necessary for obstruction clearance.

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7
Q

____ proximity sensor electronic modules (PSEMs) process signals from the _____ weight on wheels (WOW) proximity sensors to determine if the plane is on the ground or in flight

A

2, 6

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8
Q

How many weight on wheel (WOW) sensors are on each landing gear?

A

2 WOW per landing gear.

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9
Q

What happens if both WOW sensors fail on the same landing gear?

A

The PSEM’s will activate a logic that prevents the landing gear lever from selecting UP.

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10
Q

What happens if 2 WOW sensors fail on the same landing gear while on the ground?

A

LG NO DISPATCH caution message is displayed on the EICAS.

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11
Q

What happens if 2 WOW sensors fail on the same landing gear while in flight?

A

LG WOW SYS FAIL caution message may be present and the landing gear lever will be stuck in the down position.

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12
Q

How many sensors does each landing gear have?

A

Each landing gear has 2 uplock sensors and 2 downlock sensors.

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13
Q

What happens if the 2 UPLOCK or DOWNLOCK sensors on one landing gear disagree?

A

That sensor that is in agreement with the landing gear lever position will be considered valid.

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14
Q

How many alternate ways are there to extend the landing gear?

A

2, MECHANICAL OVERRIDE (the red pull bar lever under the F.O.’s seat) and an ELECTRONIC OVERRIDE (little red toggle switch next to the red pull bar under the F.O.’s seat)

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15
Q

What do you do when the landing gear lever control box (normal landing gear lever) fails?

A

The ELECTRICAL OVERRIDE system is used to extend the landing gear. It bypasses the PSEM and commands gear extension in the same sequence as the normal operation.

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16
Q

If hydraulic pressure is not available for landing gear operation, or the electrical system fails, how do you extend the landing gear?

A

Landing gear extension is preformed by the ALTERNATE GEAR EXTENSION LEVER. (Red lever under F.O.’s seat)

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17
Q

What does pulling the ALTERNATE GEAR LEVER do?

A

It releases residual hydraulic pressure in the landing gear lines and opens all landing gear uplocks.

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18
Q

If the ALTERNATE GEAR EXTENSION LEVER has been pulled but one main gear does not lock down, what can you do?

A

Slip the plane to use aerodynamic drag to assist in fully extending and locking the affected leg.

19
Q

What assists in landing gear extension or retraction should the right engine or right EDP failure occur?

A

THE PTU is a hydraulic pump that transfers hydraulic power from system 1 to system 2.

20
Q

What does the LG WRN INHIB button do? (located just above the F.O.’s MCDU)

A

Silences landing gear warning, primarily used in the event of a dual radio altimeter failure.

21
Q

How is the nose wheel steering system engaged?

A

Hydraulic system 2 must be pressurized; and the external steering disengage switch must be in the engaged position; and the handwheel steering must be pressed. (If pressed and released rudder steering is available.)

22
Q

What are the 3 modes of operation for the nose wheel steering?

A
  • HANDWHEEL
  • RUDDER PEDAL
  • FREE WHEEL
23
Q

When is handwheel steering used?

A

It is used for low speed control and whenever a smaller turn radius is required.

24
Q

When is Rudder Pedal Steering used?

A

It is designed to be used during high speed ground operations or whenever a smaller radius turn is not required.

25
Q

When is Free Wheel steering used?

A

It is mostly used during towing or when the normal steering system fails.

26
Q

What are the ways to disengage the steering system?

A
  • The steering disengage button, (backside of either yoke)

- The external steering disengage switch is selected to disengage.

27
Q

How are the brakes controlled?

A

the brake system employs brake-by-wire rudder pedals

28
Q

Which brakes does hydraulic system 1 provide pressure too? Hydraulic system 2?

A

Hydraulic system 1: OUTBOARD BRAKES
Hydraulic system 2:
INBOARD BRAKES

29
Q

How would you stop the plane if a simultaneous hydraulic failure occurred?

A

The Emergency/Parking Brake.

30
Q

The brake system has ____ brake control module (BCM’s) and ____ Autobrake control module. how are the powered?

A

2
1
by the DC ESS buses.

31
Q

The BCM’s provide 4 main functions?

A
  • Locked Wheel protection
  • Antiskid protection
  • Automatic wheel braking
  • Touchdown protection (if brake pedals are depressed)
32
Q

Antiskid protection works when?

A
  • On the ground

- Wheel speed at or above 10 KTS.

33
Q

Does the Emergency / Parking brake have Antiskid?

A

NO

34
Q

Locked Wheel protection works when?

A
  • On the ground

- Wheel speed above 30 KTS.

35
Q

How does Locked Wheel Protection work?

A

It compares the speed of the inboard and outboard wheel on each main landing gear. When speed differential is more than 33% the BCM releases the brakes on the slower wheel allowing speed equalization.

36
Q

Automatic wheel braking does what?

A
  • Prevents the main landing gear from retracting with the wheels spinning.
  • a friction type device inside the gear bay stops nose wheel rotation.
37
Q

What are the Touchdown protections provided by the Automatic braking system?

A
  • Prevents brake application on touchdown until: WOW+3 seconds, or
  • Wheel speed above 50 KTS (this usually happens first)
38
Q

What happens during a rejected takeoff?

A

RTO will command maximum braking.

39
Q

When RTO is set, the Autobrakes apply maximum braking when?

A
  • Wheel speed above 60 KTS.

- Thrust levers IDLE or REV.

40
Q

What speeds do LO MED and HI slow the plane?

A
  • LO: 2 KTS per second
  • MED: 5 KTS per second
  • HI: 8 KTS per second
41
Q

How long do the Autobrakes take to engage?

A

2 seconds after WOW.

42
Q

how can the autobrakes be disarmed after touchdown?

3 ways

A
  • Selecting the Autobrake Knob to OFF
  • Pressing on the brake pedals during autobrake application.
  • advancing the thrust levers beyond idle thrust during autobrake application.
43
Q

How is the Emergency/ Parking brake powered? Is there a backup?

A

By hydraulic systems 1 and 2.
YES, the system has pressure accumulators that are isolated from both hydraulic systems. the accumulators have sufficient pressure to provide 6 full-brake applications.

ERJ175 systems (3 decks)

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