11.9 Flashcards
flight controls
what effect does pulling the control column rearwards
elevators deflect upward, aircraft nose up
what does inner loop of auto pilot control
controls attitude of aircraft and is always active
signal used to dampen Dutch roll oscillations
yaw rate
what is used to disconnect auto throttle system
pushing throttle lever disconnect button
what is acars used for
manual and automatic data transfers between aircraft and ground in both directions
how is cable tension regulated
cable tension regulator
How is flutter and vibration elimated
Hydraulic damping or static balancing
When do spoilers assist flap system
As ground spoilers lift dump
Movement around lateral axis does what
Change angle of attack
Effect of speed brakes selected in a turn
Both sets of spoilers extend by a set amount
What prevents aerodynamic loads from pushing screwjack operated flaps back up
No back break used to
How is over run in a trimmanle horizontal stabaliser prevented
Switches and mechanical stops
What happens at control column of aileron trim is activated
Moves control colomn in same direction
What is turn co-ordination
Control surfaces act in conjunction with each other
What happens if only 1 side of flaps deploy
Flap extension automatically stops
How is airflow maintained at high angles of attack of the aerofoil
Using slotted slats
Result of left and right wing inboard ailerons both deflecting downwards together
Droop assist for the flaps
Flaps and slats deployed what happens to air loads on aircraft
Increase lift and drag
What flight controls activate a take off warning
Flaps , slats , speed brakes or trimmable horizontal stabiliser out of position
Extending flaps and slats does what to a wing profile
Increase camber and wing surface area
How does fly by wire control system develop a control input
Electrical signals transmitted to servo valves which regulate pressure at actuator
Which way will surface move to give left co-ordinated turn
Left aileron and roll spoilers up , right down and rudder left
In fly by wire system how is actuator hydraulic pressure regulated
Servo - valves
What prevents excessive rudder limiter control movement at high speeds
Rudder limiter
Purpose of trimmable horizontal stabiliser
Compensate for unbalance along longitudinal axis
How are spoilers retracted if hydraulic pressure is lost, if deployed
Blown down by airflow
What axis is roll around
Longitudinal
What level of flight control is used to increase lift
Secondary
Speed brakes double as what
Roll assist spoilers
Rudder trim switch counters imbalances around what axis
Vertical
What flap gives the most lift
Flower 95%
What is manouver load control
Moves centre of lift inboard during maneovers using the wing surface
What is gust load allevation
Reduces effect of gust loads on the aircraft by deflecting control surfaces
How is gust load allevation used
With fly by wire
When are power assisted controls used
High speeds and the pilot is connected
What’s is artificial feel
Pilot feels resistance when using power operated flight controls
What’s the purpose of servo operation
Converts electrical input into proportional hydraulic movement
What’s fly by wire
Pilot inputs are transducer into electrical signal and sent to flight computer
How is flutter prevented
Hydraulically powered control surface or static balancing
What happens in stall warning
Nose down in put to elevator
Stick shake
When are outboard ailerons locked out
High speed flight
