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AG Tech > DSC Landing gear > Flashcards

DSC Landing gear Flashcards

1
Q

What controls the landing gear ?

A

2 LGCIU (landing gear control and interface unit)

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2
Q

What is the switch between LGCIU happening ?

A

After the full RETRACTION of the landing gear

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3
Q

When is the landing gear safety valve active ?

A

Speed more than 260kt with data from ADR1 or ADR3

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4
Q

What HYD power the landing gear ?

A

Green

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5
Q

To which LGCIU is connected the Landing gear indicator panel ?

A

LGCIU 1

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6
Q

From which LGCIU does the GPWS receive data ?

A

LGCIU 1

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7
Q

When does the red arrow next to the landing gear lever illuminates ?

A

when A/C in landing config and gear not down lock

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8
Q

What HYD system power the NWS and which computer controls it ?

A

Yellow
Controlled by the BSCU

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9
Q

When does the NWS stop being connected to the rudder ? Hand wheel ?

A

above 130kt
Above 80kt

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10
Q

What are the brakes systems on the A/C ?

A

Normal brakes => Green HYD
alternate brakes => Yellow HYD

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11
Q

When does the switch between the BSCU channels occur ?

A

When the landing gear is selected DOWN

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12
Q

What controls the antiskid ?
When does it become available?

A

BSCU
>20kt

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13
Q

What controls the alternate braking ?

A

ABCU (alternate braking control unit)

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14
Q

What are the different type of alternate braking available and how are they controlled ?

A
  • Alternate braking with antiskid (braking controlled by ABCU and antiskid by BSCU)
  • Alternate braking without antiskid (braking by ABCU)
  • Alternate braking without antiskid on accumulator (ABCU)
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15
Q

What info is used for the antiskid ?

A

Ref speed from BSCU
BSCU gets speed from ADIRS 1,2 or 3

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16
Q

What computers are required for the autobrakes to work ?

A

At least two SEC operative

17
Q

What do you need to be able to arm the autobrakes ?

A
  • green HYD
  • Antiskid
  • at least one ADIRS
  • no failure in braking system
18
Q

What is the delay after the spoiler for the autobrake to start working ?

A

2sec

19
Q

What is the target deceleration rate for the autobrakes LOW, MED?

A

2 m/s² low
3 m/s² Med

20
Q

When will the autobrake trigger on landing ?

A

When ground spoiler deploy so:
- Ground spoiler armed: Both main gear on ground and both thrust lever idle or one at reverse other below MCT
- Ground spoiler not armed: both main gear on ground and reverse on at least one and other below MCT

21
Q

What HYD system power the park brake ?

A

Yellow

22
Q

How long can the park brake be maintain for ?

A

12h

23
Q

What are the main operational consequences of loosing LGCIU 1 + 2 ?

A

Loss of AP 1+2 and ATHR => Raw data
CAT I
No gear retraction due gravity extension => Fuel burn
No reverser

24
Q

What happens for the gear doors with the gravity extension ?

A

they remains open

25
Q

What is the approximate increase in fuel brun with the gear extended ?

A

180%

26
Q

When do you expect to see the DECEL light when using autobrake

A

when 80% of the selected rate is achieved

27
Q

When might you not see the DECEL light on landing with autobrake ?

A

Decel rate not achieved due slippery rwy

28
Q

What information is shown on the triple brake indicator ?

A

pressure of the Yellow HYD when alternate braking activated or on ground with park brake

29
Q

At what speed is the landing gear safety lock active ?

A

Speed above 260kt, landing gear cannot be operated

30
Q

Do we have to manually set alternate brakes

A

No, they will self down-reg with failures

31
Q

Describe Normal brakes

A

Operative when G Hyd available and A/SKID and N/W STRG on

Antiskid operative and Autobrake available
Braking and antiskid via BSCU

32
Q

Describe Alt braking without ( antiskid

A

Antiskid deactivated either:
*Electrically (A/SKID and N/W STRG off, elec supply failed or BSCU failure) or
*Hydraucially (G+Y failure)

Brakes on accumulator only, auto limit to 1000psi (7 full brake applications)

33
Q

Do we need inspection after shear pin failure

A

No if push stopped immediately
Yes if tractor touched towbar or if not stopped immediately

34
Q

Max brake temp imbalance?

A

Temp diff between 2 brakes on 1 gear >150 deg with one >600 deg or <60 deg
Ave diff between L and R >200 deg or one brake >900 deg

35
Q

When is autobrake available on TO

A

> 72kt (if spoilers armed they will immediately deploy when TL set to idle)

AG Tech (9 decks)

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