Flight Controls Flashcards
How many elevators does the aircraft have?
2
What flight computers control the elevators & THS and what is the sequence of redundancy?
ELAC 2 controls elevators & THS
ELAC 1 takes over followed by SEC 2&1
Which hydraulic sources power the left and right elevators and what redundancy is there?
Left elevator - Green system
Right elevator - Yellow system
Blue system acts as backup to both
When will the backup hydraulic system become active with regards to elevator control?
If the primary hydraulic system fails or following a failure of ELAC 2
What hydraulic systems power the THS?
And which flight control computers control the hydraulic actuators and how many motors are there?
Green and Yellow system power the THS
ELAC 2 power motor 1, if this fails
ELAC 1 powers motor 2, if this then fails
SEC 2 powers motor 3 and then
SEC 1 powers motor 2
Can the THS be moved manually?
Yes, manual movement has priority
Explain a servojack being in:
Active mode
Damping mode
Cantered mode
Active - jack position is electrically controlled
Damping - jack follows surface movement
Centering - jack is hydraulically retained in neutral position
How many ailerons does the aircraft have? Which spoilers are used for roll control along with the ailerons?
2 (one on each wing)
Spoilers 2-5 on each wing help with roll
Which hydraulic systems actuate the ailerons?
The green and blue hydraulic systems.
With green being the primary.
Which flight computers control the ailerons & what is the redundancy?
ELAC 1 controls the ailerons electrically
ELAC 2 takes over if ELAC 1 fails
If both ELAC 1 & 2 fail the SECs will provide roll control via the spoilers
Which spoilers make up the ground spoilers?
All 5 on each side, 1-5
Which spoilers make up the speedbrake?
2, 3, 4
Which spoilers make up roll control?
2-5
Which flight computers control which spoilers?
SECs
21133 FUSELAGE 33112
If a spoiler is deployed and the associated SEC fails, what happens to the spoiler?
The spoiler will retract
If a spoiler is deployed and the associated hydraulic system fails what happens to the spoiler?
It will maintain its position at the time of failure or a lesser position if aerodynamic forces push it down.
If a spoiler on one wing fails the associated spoiler on the opposite side is inhibited
When is speedbrake extension inhibited?
-SEC 1 & 3 fault
-An elevator is faulty
-AOA protection is active
-Flaps are CONFIG FULL
-Thrust levers are above MCT
-Alpha Floor is active
Which Hydraulic systems power which spoilers?
GYBYG FUSELAGE GYBYG
When will the spoilers fully deploy during an RTO when armed and not armed?
If armed and wheel speed >72kts, TL IDLE
If NOT armed and wheel speed >72kts, REV on 1 engine
When will the spoilers fully deploy during landing when armed and not armed?
If armed - both main LG on ground and both thrust levers set to IDLE
If spoilers not armed - both main LG on ground and reverse selected on at least one engine
When do the spoilers deploy with a reduced deflection (phased lift dumping) when armed and not armed?
Armed - one main landing gear on ground and both thrust levers at IDLE
Not armed - one main landing gear on ground and one thrust lever in reverse
To reduce bounce severity during inappropriate thrust lever handling in the flare, when are ground spoilers partially deflected?
-Spoilers armed
-Both main LG on ground
-Both thrust levers below CLB
When do ground spoilers retract?
After landing, when spoilers disarmed
After RTO, when spoilers disarmed
During touch & go, when at least one thrust lever advanced above 20 degrees
Which flight control computers control automatic rudder movement?
The ELACs compute rudder movement for yaw damping & turn coordination and send them to the FACs
Which hydraulic systems are responsible for rudder movement and what redundancy is there?
Green system normally with yellow as backup.
Blue system can be used for direct mechanical control of the rudder.
Describe how the rudder travel limiter functions?
The maximum rudder deflection gradually reduces and aircraft speed increases to avoid over stressing the aircraft (reduces structural loads)
At high aircraft speeds, what happens if you apply a full manual rudder input?
You will get the maximum rudder deflection available for the aircraft speed
If the rudder travel limiter fails in flight, what happens?
The maximum rudder deflection is frozen at the point of failure
Full authority is restored when slats are extended to allow full rudder deflection for approach and landing
How does the rudder trim function operate and what components make it up?
Two electric motors control the rudder trim. Motor one is powered by FAC 1 powers the trim and motor two powered by FAC 2 is a backup.
How many slats and flaps are there on the A320?
5 leading edge slats and 2 trailing edge flaps on each wing
What hydraulic system actuates the flaps and slats, and which computers control movement?
Flaps actuated by Green and Yellow
Slats actuated by Green and Blue
2 SFCCs calculate movement
If one of the slat/flap hydraulic systems fails or one of the associated SFCC computers fails, what is the effect?
Slats/flaps travel at half speed
What happens if a flap mechanism failure occurs?
A flap disconnect detection system can detect failures by measuring excessive differential movement between inner and outer flaps.
It will then inhibit further flap operation.
What happens if the flaps or slats deploy unevenly?
An Asymmetric Position Pickoff Unit (APPU) will detect any asymmetry and apply the wing tip brake to prevent any further movement. The wing tip brake can only be released on the ground by an engineer.
What is the ALPHA/SPEED lock function regarding slats?
It inhibits slat retraction when the lever is set to 0 if
-the AOA is too high (>8.5deg)
-the aircraft speed is too low (<148kts)
What is VLS and it’s relationship to the stall speed?
VLS computed by the FACs based on FMS data is a multiplier of the stall speed depending on phase of flight and flap setting
