Flight Control Flashcards
What control surfaces are on the aircraft?
Ailerons (4 control surfaces)
Flaps (4 control surfaces)
Ruddervators (4 control surfaces)
Rudder (1 control surface)
How many servos control the flight control surfaces?
13 servos
How are the flight controls actuated?
Pilot control input in GCS uplinked to aircraft
Three FCAs in RCM interpret input and create command message
Each command message sent to 2 vote processors
Multiplexer in RCM selects which UARB is used to send and receive control movement message
RCM receives command or generates them (autoflight)
Commands routed through UARB network
Servo actuates
Servo status and position are routed back through UARB network
RCM confirms execution
What happens if a servo fails?
SAS automatically increases the amount of deflection of the working control surface (inboard/outboard)
How does the aircraft overcome adverse aileron yaw?
The up moving aileron moves 2.5 times as far as the down moving aileron
How far can the flaps/ailerons be decambered?
10 degrees up at maximum speed (based on Cl so the higher airspeed the lower the Cl = more decamber)
When are flaps set automatically?
Airspeed >134 KIAS
OR
Landing gear UP and airspeed hold on
OR
ATLC active
Do ruddervators prioritize pitch or yaw?
Pitch
Because pitch control is prioritized over yaw, simultaneous pitch and yaw inputs may result in reduced yaw authority and insufficient direction control prior to nose wheel touchdown
How are the servos powered?
28 VDC from both BUS 1 & 2
As Cl increases above 0.8 what happens to the flight control?
(Slower speed)
Only flaps are will be deflected down to a positive position
Ailerons will remain in the neutral 0 degree position
As Cl decreases below 0.8 what happens to the flight control?
(Faster airspeed)
Both ailerons and flaps are decambered to a negative position (max 10 degrees)
What is the length, height, & wingspan of the aircraft?
Length = 36.2
Height = 13.1 ft
Wingspan = 66 ft
