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EMB 175 > Landing Gear and Brakes > Flashcards

Landing Gear and Brakes Flashcards

1
Q

How is the landing gear extended and retracted?

A

Electrically commanded and hydraulically controlled.

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2
Q

When will the aural warning for the landing gear sound?

A

If the gear is not down and locked below 700FT RA with flaps at five or full and reduced TLA or any altitude with the flaps greater than five.

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3
Q

Can the landing gear aural warning be silenced by pushing the LG WRN INHIB button?

A

Only if both radio altimeters have failed.

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4
Q

What are the three landing gear extension modes?

A
  • Normal…. LG lever DOWN
  • Electric override……..Bypasses the PSEM to directly command the selector valve.
  • Alternate gear extension…… Manual uplock release opens free fall sequencing valve.
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5
Q

What is the purpose of the DN LOCK RLS button on the landing gear lever?

A
  • Mechanically releases the landing gear lever lock.

* Lock protects agains inadvertent landing gear retraction on the ground.

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6
Q

What keeps the gear lock in position?

A
  • Extended downlock springs.

* Retracted uplock hooks.

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7
Q

Describe the landing gear indications.

A
  • Green…. Down and locked.
  • White…….Up and Locked.
  • Amber……In transist
  • Red…… gear position and lever disagreement… 20 second grace period.
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8
Q

How do the landing gear doors actuate?

A

Mechanically, during landing gear extension or retraction.

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9
Q

how are the brakes commanded?

A
  • Brake by wire.
  • Electrically commanded and hydraulically actuated.
  • Pedal position transducers send brake request to the BCM… Brake Control Module.
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10
Q

What Hydraulic systems provide brake pressure?

A
  • System one….. Outboard
  • System two….. Inboard.
  • System one and two…. parking and emer brakes.
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11
Q

What brake protections are provided?

A
  • Touchdown……..No braking until three seconds or wheel speed of greater than 50 Knots.
  • Anti skid…. Compares wheel speeds and releaes pressure… Inop less than ten knots.
  • Locked wheel….Allows up to 33% differential braking for steering purposes…. Inop less than 30 Knots.
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12
Q

How many applications will the parking emer brake provide?

A

Six

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13
Q

What stops the wheel from spinning during retraction?

A
  • Mains…… BCM applies brakes after weight off wheels.

* Nose…… Snubbers in the nose bay.

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14
Q

What system controls the nose wheel steering?

A

Hydraulic two

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15
Q

What are the limits of the nosewheel steering?

A

Angle varies with ground speed.

  • Up to 40 knots…… 76 degrees.
    41 to 100 knots… Decreases from 76 to 7 degrees.
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16
Q

Location and purpose of prox sensors

A

Upper lower and middle…
Upper up and locked
Middle down and locked
Lower weight on wheels

17
Q

Feedback sensors

A

Provide feedback on nose wheel steering angle and over steering.

18
Q

What is the PSEM?

A

Proximity sensors electronics modules.

EMB 175 (25 decks)

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