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WorksheetsAutoflight - Command Signal Processing
Total questions: 39
Worksheet time: 39mins
If the pendulum is displaced from the vertical with a signal output this indicates?
Slipping or skidding
Dynamic vertical
No indication
What is used to provide the stable reference and provide the primary element of the inner loop stabilisation?
Gyroscopes
Static/dynamic pressure
RMI
What is used to provide an electrical signal that is proportional to acceleration?
Torque balanced accelerometer
Rate gyro
Air data sensor
What will happen to an auto pilot if a gyro won't pick up micro attitude movements?
Accelerometer will correct it
Air data sensor will correct it
Force transducer will correct it
What is provided in some AFCS to enable the pilot to manoeuvre the airacft in pitch and roll through the AFCS by exerting normal pressure on the control wheel?
CWS
AP disconnect
Trim switches
What serves the use in an AFCS to provide a position feedback signal from the actuator to the flight computer?
LVDT
CWS
Force transducer
The output from a LVDT contains what information?
Direction and displacement
Direction
Displacement
Which type of trim tab is adjusted by bending the metal strip so that it produces a constant force?
Fixed
Controlled
Electric
What serves the purpose to provide an indication of signals being supplied to the servomotors and indicate any out of trim conditions of the aircraft under normal operating conditions of the control system?
Trim indicators
Trim control devices
Electric trim switch
What is accomplished by a separate trim servomotor coupled to the elevator trim tab system and operating in parallel with the elevator servomotor?
Auto trim
Manual trim
Electric trim
What provides the distance the control surface is displaced from neutral and is proportional to the length of time the input signal is applied?
Position feedback
Response loop
Rate feedback
What provides the speed at which the control surface is moving resulting in a damping effect on the control surface response to provide tighter control over the aircraft?
Response loop
Position feedback
Rate feedback
What servo loop operation has the feedback signal opposing the initial input signal nulls it out, closing the loop of operation
Closed loop
Open loop
Circle loop
When flight control surface are aligned, the control column LVDTs and auto pilot LVDTs must all be calibrated and aligned to null position. What is this alignment called?
Rigging
Dampening
Feedback
Which element of a AFCS is considered to be the internal control or inner loop of the system?
Detecting element
Command element
Computer element
Which element of an AFCS is considered to be the external controls or outer loop of the system?
Detecting element
Command element
Computer amplifier
Which component of an AFCS is responsible for the basic attitudinal stability of the aircraft or better known as stability augmentation system or damper system?
Inner loop
Outer loop
Middle loop
Prior to engagement the AFCS controlling circuitry will align to?
Current control surface positions
Current longitude and latitude
Centre of gravity
When gain factors are altered automatically to offset variations in handling characteristics resulting from changing flight conditions is called?
Gain programming
Adaptive control
Model reference
What is it called when limits are placed on commanded control signals to prevent excessive attitude changes and harsh manoeuvring?
Limiting
Synchronisation
Turbulence
What is used to control the roll angle authority of the control system with the angle limit set a function of the selected control mode?
Bank angle limiter
Dampening system
Synchroniser
What is it called when the aircraft is returned to its original attitude (before a gust of wind hit), nulling the original error signal produced by the gyro?
Aerodynamic feedback
Dampening
Limiting
Ailerons, spoilers, elevators, rudder, stabilators, canards, elevons and ruddervators are all considered to be?
Primary flight control surfaces
Secondary flight control surfaces
Tertiary flight control surfaces
How much turning force is required to override the auto pilot on a control wheel?
25-35 pounds
40-50 pounds
10-20 pounds
How much turning force is required to override a control column engaged by the auto pilot?
25-35 pounds
40-50 pounds
10-20 pounds
What determines the amount of force required to overpower the autopilot?
Operating pressure of the relief valve
Operating pressure of the servos
A high LVDT signal input
A wing leveler is considered to be?
Single axis
Double axis
Multiple axis
What allows the control surface displacement to be applied at a rate that matches the rate of input signal application and provides a dampening effect on the control surface response, providing tighter control over the aircraft?
Position feedback
Rate feedback
Command feedback
What is considered to be the brain of the system for an auto pilot?
Flight control computer
Automatic flight control system
Autopilot control head
What does this mode of roll channel do?
Levels the airplane, if not level, and maintains wings level after engage (synchronise before engage)
Holds the roll attitude after engage
Engages the roll servo
What does this Pitch channel do?
Holds pitch attitude at engage
Holds attitude when selected
Engages the pitch servo
The processing for the extended turn take signal from WHAT and applies it via a lag circuit and gain programmer to rudder actuator and so produces a steady state displacement of rudder to oppose slip and skid and maintain coordination?
C.G accelerometer
Forward accelerometer
Gain programmer
To ensure AFCS compatibility an airspeed switch cuts out the desired true yaw rate signal so at speeds greater than WHAT, the yaw rate control is related solely to actual yaw rate of the aircraft?
135 knots
125 knots
115 knots
What is the tragicomic value that is used by flight control systems to compensate for the loss of lift that occurs when an aircraft banks to make a coordinated turn?
1-cosine
1-sine
1-tangent
What is the frequency transmitted by the localiser on the left side of the aircraft?
90 Hz
150 Hz
30 Hz
Altitude information essential for vertical guidance to touchdown via auto land is signals provided by which component?
Radar altimeter
HSI
ADI
When the aircraft has descended to 1500 ft radio altitude in auto land
Localiser and glideslope captured and the armed off line control channels are then automatically engaged
The horizontal stabiliser is automatically repositioned to begin trimming the aircraft to a nose up attitude
The elevators are deflected to counter the trim and to provide pitch control in the trimmed attitude
At radio altitude 330 ft in auto land
The horizontal stabiliser is automatically repositioned to begin trimming the aircraft to nose up altitude
The ILS is captured and the armed off line control channels are then automatically engaged
The flare mode is automatically engaged
When the landing gear us 45 feet above the ground in auto land
The flare mode is automatically engaged
The flare mode is disengaged and there is a transition to the touchdown and roll out mode
The horizontal stabiliser is automatically repositioned to begin nose up attitude
