ATA 32 - Landing Gear Flashcards
How many channels of BSCU ?
2 channels
System diagram of brake system ?
Cf diagram
Give the 4 brakes mode ?
Normal braking
Alternate braking with A/S
Alternate braking without A/S
Alternate braking without A/S on accumulator
How many LGCIU ?
2, 1 master and 1 slave
Change at each retraction cycle (or failure)
Which LGCIU controls gear lights on main panel ?
LGCIU 1
When does the interlock of landing gear lever is active ?
Landing gear compressed or nose gear not centered
Are wheels braked when retracted ?
Yes, main gear wheels are braked automatically during retraction.
Nose wheels are braked with rubber band in the nose gear bay.
VLE (speed and mach) ?
280 kt , M 0,67
Operation of gear is prevented by safety valve at which speed ?
260 kt
Which LGCIU is displayed on ECAM wheel page ?
1 and 2
Each LGCIU represent one triangle
If 1 triangle amber and 1 triangle green on ECAM Wheel page, landing gear locked ?
Yes, 1 green is sufficient
At what altitude landing memo is displayed ?
2000ft RA and on approach
What does mean red arrow of landing gear lever ?
Gear not downlocked while on approach configuration
What does each rotation of the gravity extension lever perform ?
1st turn : hydraulic cut off valve
2nd turn: release doors
3rd turn : release gear
Is it possible to retract gear after gravity extension ?
No (and gear doors stay open) —> fuel consumption increase
NSW maximum deflection values and speed for disconnection for:
-pedals
-handwheel ?
Pedals : 6°, disconnects at 130kt
Handwheel: 75° disconnects at 70 or 80kt
Which hydraulic circuit for NSW ?
Old: Green, actuated in return line of nose doors (—> if gravity extension, you loose NSW)
New: Yellow
Anti skid works on which information ?
Wheel tachometer vs ADIRS 1 2 3 aircraft reference speed (or fastest wheel if ADIRS failure)
90% —> brake off
Anti skid is inhibited at which speed ?
20kt
How many full brake applications available if on «Alternate braking without antiskid on accumulator» ?
7 at 1000psi
Can autobrake MAX be armed inflight ?
No
On which hydraulic circuit works autobrake ?
Green
When will autobrake lights be displayed on main panel ?
Deceleration > 80% deceleration rate selected
What systems should be operational for autobrake use ?
BSCU
1 ADIRU
2 SECs ( for spoilers )
At which ground speed will autobrake work ?
Above 72kt, when spoilers deploy
The command for ground spoilers extension is detected, and the wheel speed is above 40 kt, for MAX mode
Will autobrake work if ground spoilers not armed ?
Yes, when 1 reverse and other lever at least idle
At which temperature of brake a green arc appears on ECAM door page ?
Above 100°C only on the hottest
Can the gear be extended above 260 kts if necessary?
Yes , but only manually
Nose wheels and main wheels have fusible plugs that prevent the tires from bursting if they overheat. True or False ?
False, not on nose gear
The parking brake accumulator is designed to maintain the parking pressure for at least _____ h ?
12h
On wheel page of ECAM, Autobrake is flashing green. What does it mean?
Autobrake disengaged
When is NSW by the handwheel available ?
Below 70kts, one engine running and towing lever normal position
During an approach you get MASTER WARNING and ECAM : “GEAR NOT DOWN”, and both radio altimeter failed, what is the reason ?
LG not downlocked, Flaps FULL or 3, RA < 750ft
Max braking has been selected, TAKE-OFF being aborted after 72kt, engines in reverse, you have forgotten to arm the ground spoilers ; is the AUTOBRAKE activated ?
Yes because ground spoilers will still be activated
After LIFT-OFF, is BRAKES HOT WARNING on ECAM still available ?
No matter what position of the landing gear lever
After T/O the LEFT MAIN GEAR SHOCK ABSORBER is stuck in compressed position. Can you retract gear ?
No. Lever is blocked.
Which ADR’s controls the SAFETY VALVE closure of the GREEN HYDRAULIC SUPPLY of the landing gear when speed > 260 KTS ?
ADR 1 and 3
Deflection maximale NSW handweel et rudder pedals ?
75° & 6° function of aircraft speed. Max speed ~70kt and ~130kt respectively
