Flight Control System Flashcards
What does the Secondary Flight Control System
consist of?
Horizontal Stabiliser
Flaps & Slats
Multi-function Spoiler (when used as Speed Brake or Ground Spoilers)
Dedicated Ground Spoilers
(B12 14-08-01 Pg 1)
What two components comprise the primary control electronics?
The primary flight control electronics include two complementary parts:
- The Primary Actuator Control Electronics (P ACE).
- The Flight Control Module (FCM) .
(812 14-08-01 Pg 1)
Which flight controls are not fly by wire?
The ailerons are commanded by conventional control cables that run from each control wheel back to a pair of hydro-mechanical actuators.
(B12 14-08-01 Pg 1)
What happens to the system when it reverts to direct mode?
The FCM is removed from the control loop (for instance, due to loss of airspeed data) and the control limits default to values set by hardware in the P-ACE. (B1214-08-10 Pg 4)
How many channels does a P-ACE have?
Each P-ACE has two channels - one is the active and the other is the standby. (B1214-08-10 Pg 1)
What is the maximum time manual pitch trim inputs are allowed?
Manual commands via PITCH TRIM switches and Pitch Trim BACKUP SW switches are limited to 3s. (B12 14-08-15 Pg 11)
During an ELECTRICAL EMERGENCY, what happens to the trim system?
In the event of an electrical emergency, only the HS-ACE channel 2 is operational at low rate. A loss of airspeed data from the FCM also results in low rate operation of horizontal stabilizer, providing structural protection for the surface. (B1214-08-15 Pg 12)
What happens in the aileron system when an PCU actuator becomes disconnected from its control surface?
In the event of a disconnection of one aileron PCU from the surface or wing structure, the other PCU attached to the surface will operate normally, but the force authority will be halved. (B12 14-08-20 Pg 3)
Which pilot has the artificial feel unit facility if the aileron is disconnected due to a jammed cable?
Right Aileron Jam: FO half of the system jammed. Captain retains control of the left aileron and the pair #5 of multi-function spoilers will remain available with normal artificial feel.
Left Aileron Jam: Captain’s half of the system jammed. The First Officer retains control of the right aileron without artificial feel and roll trim since the feel mechanism is attached to Captain’s half of the system, the pair #4 of multi-function spoilers will remain available. (B12 14-08- 20 Pg 3)
What happens to the speed brakes if the flaps are selected to position 2?
If extended during approach, the speed brakes will automatically retract upon selection of slat/flap 2 or above. (B12 14-08-35 Pg 4)
When the slats and flaps are commanded to move, what is the order of the movement?
Slat and flap motion is sequenced such that slats extend first and flaps retract first when the motion command requires both surfaces to move. (B12 14-08-30 Pg 1)
With speed brakes selected out, the thrust levers are advanced beyond 70° TLA, what happens?
In order to prevent inadvertent operation during a go-around manoeuvre the speed brakes will automatically retract anytime the thrust levers are advanced beyond Thrust Lever Angle (TLA) 70 degrees. (B12 14-08-35 Pg 4)
Flap position 4 and 5 give the same physical slat/flap position, what is the difference?
Position 4 is gated for normal Go Around and Take off. Position 5 is used for landing. (B12 14-08-05 Pg 3)
