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Mesa E-175 Oral Prep 2022 (just updated) > Landing Gear and Brakes > Flashcards

Landing Gear and Brakes Flashcards

1
Q

How is the landing gear extended and retracted?

A

Electronically commanded and hydraulically actuated

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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 and:
1. < 700’ RA and low TLA (45º both ENGs, 59º OEI) or
2. Any altitude with flaps ≥ 5

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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 RAs have failed

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4
Q

What are the 3 landing gear extension modes?

A
  1. Normal
  2. Electric Override (Bypasses PSEM to directly command selector valve)
  3. Alt Gear Extension
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5
Q

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

A
  1. Mechanically releases the landing gear lever lock
  2. Lock protects against inadvertent landing gear retraction when WoW
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6
Q

What keeps the gear locked in position?

A

Extended = Downlock springs
Retracted = Uplock hooks

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7
Q

Describe the landing gear indications?

A
  1. Green = DnL
  2. White = UnL
  3. Amber = In Transit
  4. Red = Gear Position & Lever Disagreement (after 20 secs)
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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
  1. Brakes by Wire (elec. cmd, hyd actuated)
  2. Pedal position transducers send brake requests to the Brake Control Module (BCM)
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10
Q

What hydraulics systems provide brake pressure?

A

Hyd 1 = Outboard brakes
Hyd 2 = Inboard brakes
Hyd 1/2 = Emer/PB

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11
Q

What protections are provided for braking?

A
  1. Touchdown (no braking until 3 secs or > 50 kts wheel speed
  2. Locked wheel (allows up to 33% differential braking for steering purposes)
  3. Anti-skid (compares wheel speeds and releases pressure)
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12
Q

Below which speed does anti-skid stop working?

A

Below 10 knots

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13
Q

Below what speed does locked wheel protection stop working?

A

Below 30 knots

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14
Q

How many applications will the parking brake/emergency brake provide?

A

6 applications

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15
Q

What are the limits for nosewheel steering?

A

Angle varies with groundspeed
1. Up to 40 kts (76º)
2. From 40 kts to 100 kts it decreases linearly from 76º to 7º

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16
Q

What stops the wheels from spinning during retraction?

A

Main gear = BCM applies brakes after W-off-W
Nose gear = Snubbers in the nose bay stop the wheels

17
Q

How does the alternate gear extension work?

A
  1. You press the button on the top of the alt. gear lever that allows it to be actuated
  2. Pull the handle up
  3. Opens Free-Fall Selector Valve, depressurizes the landing gear hydraulic lines and releases all gear uplocks
18
Q

How does the electric override for the landing gear work?

A
  1. You move the switch from the Normal to Gear Down position
  2. This bypasses the Proximity Sensor Electronic Module (PSEM) and goes direct to LG Selector Valve to open FWD and AFT Gear Doors and extend the gears
19
Q

What are the 2 Autobrake Modes?

A
  1. Landing (Lo, Med, Hi)
  2. RTO
20
Q

What 4 actions cancel the autobrakes?

A
  1. Autobrake selector knob to OFF position
  2. Brake Pedals are applied (wheel speed above 60 kts if RTO selected)
  3. Brake Control System Failure (while below 60 kts if RTO selected)
  4. Either thrust lever applied beyond idle during autobrake application
21
Q

How many WoW Sensors are there and what monitors the WoW Sensors?

A

6 Wow Sensors monitored by 2 PSEMs that send signals to EICAS

22
Q

How many uplock and downlock sensors sense gear locked position?

A

2 uplock and 2 downlock sensors

23
Q

Brake wear can be monitored through what?

A

Brake Wear Pins located on each main wheel

24
Q

What are the 4 functions of the 2 BCMs and 1 ABM?

A
  1. Locked Wheel
  2. Anti-skid
  3. Touchdown
  4. Autobraking
25
Q

What are fusible plugs on the wheels used for?

A

They melt which relieve tire pressure in case of tire overheating

26
Q

What happens if the nose-wheel exceeds 76º

A

Reverts into free-wheel mode

27
Q

How is the alternate landing gear extension powered?

A

Mechanically powered, gravity actuated

28
Q

Are the brakes depressurized during flight?

A

Yes
1. 10 seconds after liftoff
2. gear handle in up position
3. Wheel speed 0

29
Q

Where is the rod that permits alternate gear extension?

A

It is located in the left LG bay near the aileron torque tube

Mesa E-175 Oral Prep 2022 (just updated) (20 decks)

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