27 Flight Controls Flashcards
Which spoilers are used for roll control?
2, 3, 4 and 5
Which spoilers are used as speed brakes?
2, 3 and 4
When does the appropriate spoiler arrow display on the F/CTL SD page?
With 2.5 degrees of deflection
What is an ELAC and how many are there?
Elevator and Aileron Computer, x2
What is a SEC and how many are there?
Spoiler Elevator Computer, x3
Which hydraulic system supplies which spoiler?
Spoiler: 1 2 3 4 5
System: G Y B Y G
Which hydraulic systems supply the ailerons?
Left Aileron: Blue and Green
Right Aileron: Green and Blue
Which hydraulic systems supply the elevators?
Left elevator: Blue and Green
Right elevator: Yellow and Blue
Which hydraulic systems supply the stabiliser? (Pitch trim)
Green and Yellow
Which hydraulic systems supply the rudder?
Green, Blue and Yellow
Which SEC supplies which spoiler?
Left Spoilers: 5 4 3 2 1
SECs: 2 1 1 3 3
Right Spoilers: 1 2 3 4 5
SECs 3 3 1 1 2
What is aileron droop? How is it displayed on the F/CTL SD page?
This uses the ailerons as a form of flaps to increase the lift generated by the wings at low speed. This droop is 5 degrees on the A319/A320 and 10 degrees on the A321.
It is showed by the arrow pointing to a small box in the middle of the aileron position indicator (not between the two dashes indicating clean neutral position) on the F/CTL SD page
What do the ELACs control?
Normal elevator and stabiliser control
Ailerons
What do the SECs control?
Spoiler control
Standby elevator and stabiliser control
What does FAC stand for and what does it do?
Flight Augmentation Computer (x2)
Controls rudder, rudder trim, and yaw damper inputs. It computes data for the flight envelope and speed functions. It also provides warning for low-energy and windshear detection.
What is an FCDC?
Flight Control Data Concentrator (x2)
Acquires data from the ELACs and the SECs and sends it to the Electronic Instrument System (EIS) and the Centralised Fault Display System (CFDS)
MEL FCDC 1… no dispatch
At what speed do ground spoilers auto extend in an RTO?
72kts
Which system takes over to control elevators and the stabiliser if ELAC 2 fails?
ELAC 1, then if that fails, the SECs
Which system takes over to control the ailerons if ELAC 1 fails?
ELAC 2, then they become damped
What is an SFCC? What does it do?
Slat Flap Control Computer (x2)
If one SFCC is inoperative, slats and flaps both operate at half speed.
If slat wing tip brakes (WTBs) are on, can you control the flaps? What about vice versa?
Yes, and yes
Which SFCC controls which system?
Slats:
Blue hydraulic controlled by SFCC 1
Green hydraulic controlled by SFCC 2
Flaps:
Yellow hydraulic controlled by SFCC 2
Green hydraulic controlled by SFCC 1
What is alpha lock and how does it work?
It inhibits slat retraction at high angles of attack or low speeds
AOA > 8.5 degrees or speed < 148kts
What is the altitude limitation on the slats and flaps?
20000ft
What does it mean if a hydraulic system is shown in amber on the F/CTL SD page?
Low hydraulic pressure
What happens if speed brakes are extended and you select TOGA?
They automatically retract and remain retracted until the inhibition condition disappears and the pilot resets the lever.
(The speed brakes can be extended again 10 seconds or more after the level is reset)
FCOM 27-10-20
What happens if a speed brake inhibition condition arises whilst the speed brakes are extended? What are some of these conditions?
They automatically retract and remain retracted until the inhibition condition disappears and the pilot resets the lever.
(The speed brakes can be extended again 10 seconds or more after the lever is reset)
These conditions include Flaps FULL, thrust levers above MCT, alpha floor activation, L or R elevator fault, SEC1+3 fault
FCOM 27-10-20
Which computer controls the left and right ailerons? And through which hydraulic system?
Left aileron controlled by ELAC 1 through blue hydraulics, and ELAC 2 through green hydraulics as a backup.
BG12
Right aileron controlled by ELAC 1 through green hydraulics, and ELAC 2 through blue hydraulics as backup.
GB12
FCOM 27-10-20
Which SEC controls which spoiler?
Left wing-tip to right wing-tip:
2, 1, 1, 3, 3 | 3, 3, 1, 1, 2
Which SFCC controls which hydraulic system for the slats?
Slats:
SFCC 1 controls blue
SFCC 2 controls green
Which SFCC controls which hydraulic system for the flaps?
Flaps:
SFCC 1 controls green
SFCC 2 controls yellow
Which ELAC normally controls the elevators?
ELAC 2
If the ELAC which normally controls the elevators fails, what is the subsequent order of redundancy of the computers?
ELAC 2 normally, then
ELAC 1
SEC 2
SEC 1
Which ELAC/SEC controls which hydraulic system with respect to the elevators (left and right) normally and in the case of reconfiguration due to a failure?
Left elevator:
Normally GREEN through ELAC 2
BLUE controlled by ELAC 1 and SEC 1
GREEN controlled by ELAC 2 and SEC 2
Right elevator:
Normally YELLOW through ELAC 2
BLUE controlled by ELAC 1 and SEC 1
YELLOW controlled by ELAC 2 and SEC 2
(Remember with elevators: blue system controlled by computers number 1)
FCOM 27-10-20
How many electrical motors control the trimmable horizontal stabiliser (THS) hydraulic motors?
3 electrical motors control the 2 hydraulic motors (Green and Yellow)
In normal operation, which ELAC controls which electrical motor on the THS?
ELAC 2 controls electrical motor 1
If the normal computer controlling the normal electrical motor of the THS fails, what is the subsequent priority of operation?
If ELAC 2 stops controlling motor 1, then
ELAC 1 controls motor 2, then
SEC 2 controls motor 3, then
SEC 1 controls motor 2
When is mechanical control of the THS available from the pitch trim wheel?
At any time when either the green or yellow hydraulic system is operating
(G+Y hydraulic failure? Only blue left? THS is frozen ❄️)
FCOM 27-10-20
What has priority over controlling the THS; mechanical control or electrical control?
Mechanical control (from the pitch trim wheel)
How many electrical-controlled hydraulic servojacks control each elevator?
Two
(Left: B and G
Right: Y and B)
How many control modes are there of the servojacks operating the elevators? What are these modes?
3
Active: jack position electrically-controlled
Damping: jack follows surface movement
Centering: jack hydraulically retained in neutral
In normal operation, which control modes do the elevator servojacks operate in?
One jack is in active mode, one jack is in damping mode (some manoeuvres may cause second jack to become active)
How many hydraulic motors control the stabiliser? What can those motors be controlled by?
Two (G and Y)
Controlled by one of three electric motors or the mechanical trim wheel
How many flap surfaces are there?
2
How many slat surfaces are there?
5
Which slats are are wing anti-iced?
The three outboard slats (3, 4, 5)
Below what airspeed does the flight control computer select CONF 1+F rather than CONF 1 when “flaps one” is called? How many degrees of flap is given?
Below 100kts, config given is 1+F
Above 100kts, config given is 1
10 degrees of flap are given in 1+F
At what speed do the flaps auto-retract to 0?
210kts
What is the angle in degrees of the slats and flaps in config 1?
18 slats, 0 flaps
What is the angle in degrees of the slats and flaps in config 1+F?
18 slats, 10 flaps
What is the angle in degrees of the slats and flaps in config 2?
22 slats, 15 flaps
What is the angle in degrees of the slats and flaps in config 3?
22 slats, 20 flaps
What is the angle in degrees of the slats and flaps in config FULL on an A320CEO? What about A319 and A320NEO?
27 slats, 35 flaps (40 flaps in A319 and 320NEO)
How do the slat/flap angles differ on an A321NEO from an A320?
The slat positions remain the same for each configuration and for the flap positions in config 0, 1, 1+F.
However, in config 2, 3 and FULL they differ slightly but not much (a couple of degrees)
What are the (6) speedbrake inhibition conditions?
Flap FULL selected (3 or FULL on 321) TOGA selected SEC 1+3 fault L or R elevator fault Alpha floor activated Angle of attack protection active
FCOM 27-10-20
When does the autopilot disconnect in high speed protection?
VMO + 15 kt and MMO + 0.04
Where are the two horizontal green bars displayed near to VMO in normal law?
VMO + 6 Kt
