DSC Landing gear Flashcards
What controls the landing gear ?
2 LGCIU (landing gear control and interface unit)
What is the switch between LGCIU happening ?
After the full RETRACTION of the landing gear
When is the landing gear safety valve active ?
Speed more than 260kt with data from ADR1 or ADR3
What HYD power the landing gear ?
Green
To which LGCIU is connected the Landing gear indicator panel ?
LGCIU 1
From which LGCIU does the GPWS receive data ?
LGCIU 1
When does the red arrow next to the landing gear lever illuminates ?
when A/C in landing config and gear not down lock
What HYD system power the NWS and which computer controls it ?
Yellow
Controlled by the BSCU
When does the NWS stop being connected to the rudder ? Hand wheel ?
above 130kt
Above 80kt
What are the brakes systems on the A/C ?
Normal brakes => Green HYD
alternate brakes => Yellow HYD
When does the switch between the BSCU channels occur ?
When the landing gear is selected DOWN
What controls the antiskid ?
BSCU
What controls the alternate braking ?
ABCU (alternate braking control unit)
What are the different type of alternate braking available and how are they controlled ?
- 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)
What info is used for the antiskid ?
Ref speed from BSCU
BSCU gets speed from ADIRS 1,2 or 3
What computers are required for the autobrakes to work ?
At least two SEC operative
What do you need to be able to arm the autobrakes ?
- green HYD
- Antiskid
- at least one ADIRS
- no failure in braking system
What is the delay after the spoiler for the autobrake to start working ?
2sec
What is the target deceleration rate for the autobrakes LOW, MED?
2 m/s² low
3 m/s² Med
When will the autobrake trigger on landing ?
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
What HYD system power the park brake ?
Yellow
How long can the park brake be maintain for ?
12h
What are the main operational consequences of loosing LGCIU 1 + 2 ?
Loss of AP 1+2 and ATHR => Raw data
CAT I
No gear retraction due gravity extension => Fuel burn
No reverser
What happens for the gear doors with the gravity extension ?
they remains open
What is the approximate increase in fuel brun with the gear extended ?
180%
When do you expect to see the DECEL light when using autobrake
when 80% of the selected rate is achieved
When might you not see the DECEL light on landing with autobrake ?
Decel rate not achieved due slippery rwy
What information is shown on the triple brake indicator ?
pressure of the Yellow HYD when alternate braking activated or on ground with park brake
At what speed is the landing gear safety lock active ?
Speed above 260kt, landing gear cannot be operated
