CHAPTER 27 Flashcards
Which computer processes the aircraft pitch and roll primary controls?
2 x Elevator Aileron Computers (ELAC) for pitch and roll control
Which computer processes the aircraft pitch and roll secondary controls?
3 x Spoiler Elevator Computers (SEC) for pitch and roll control
Which computer processes the aircraft Yaw control?
2 x Flight Augmentation Computers (FAC) for yaw control
Which computer processes the aircraft flap and slats?
2 x Slat Flap Control Computers (SFCC) for slat and flap control
There are two servo controls for each aileron, for each elevator and for the yaw damping function. how do they interact?
In normal configuration, one servo control actuates the surface. It is called active servo control. The second, which follows the surface deflection, is in damping mode.
In the event of simultaneous inputs on the side stick, what indications do the crew get?
In the event of simultaneous inputs on both side sticks the two green SIDE STICK PRIORITY lights, on the glareshield, come on and the “DUAL INPUT” voice message activates.
The aircraft has pre-set limitations and instructions called LAWS. What is their purpose?
Regardless of the pilots’ input, the computers will prevent excessive manoeuvres and make sure the safe envelope is not exceeded in pitch and roll axes.
Normal law is modified depending on the phase of flight. It operates in 3 modes, what are they?
Ground mode, Flight mode and Flare mode
In normal mode what rudder inputs from the pilots are required for turns and Dutch roll?
Turn co-ordination and “Dutch roll” damping are automatically provided in normal law. Pilot inputs on the rudder pedals are not required.
Under normal law, bank angle protection limits the angle of bank to what amount?
67 degrees
At what bank angle will the Flight Director on the PFD will disappear if the angle of bank exceeds?
45 degrees it will reappear on the PFD when the angle of bank reduces to less than 40 degrees.
The Load Alleviation Function (LAF) is controlled by which flying control?
Ailerons
What are the 3 flight control laws?
Normal, Alternate and Direct Law
When does spoiler No1 operate?
Ground only
What conditions would cause the Wing Tip Brake (WTB) to operate?
Asymmetry, Runaway, Overspeed and Uncommanded movement
If a SFCC fails how is the Wing Tip Brake condition confirmed?
If an SFCC does not operate, the other SFCC receives a WTB-arm signal automatically. Thus, if the second SFCC subsequently detects a failure, a solenoid valve on each WTB is energized.
How is Wing Tip Brake (WTB) conditions confirmed?
Detection by cross comparison of Asymmetry Position Pick-Off Unit (APPU) and Feedback Position Pick-off Unit (FPPU) signals. If any of these failures are detected by a Slat Flap Control Computer (SFCC) and confirmed by the second one, the WTBs are applied.
What is used to monitor the control valve position with the drive command orders?
Linear Variable Differential Transducer (LVDT)
If one hydraulic system was to fail in the THS system, what would be the effect on the movement of the THS?
Due to the differential gearbox, the system moves with full torque at half speed.
What modes of operation do the servo control systems use?
Active, Damping and re-centring
What flying controls have mechanical backup?
THS and Rudder
