AUTOMATIC FLIGHT & CONTROL SYSTEMS Flashcards
- A single axis autopilot system:
d. Provides control about the roll axis
- A single axis autopilot may also be called:
b. Wing leveller
- An auto pilot:
c. is an auto stabilisation system
- The fundamental components of an autopilot control loop are:
a. Rate gyro, servomotor, error signal generator
- A device in a closed loop control system in which a small power input controls a much larger power output in a strictly proportionate manner is:
b. A servomechanism
- An automatic flight control system:
a. Is another name for an autopilot system
- An aircraft has yaw damping included in its auto stabilisation system. An essential requirement of such a system is:
a. A three axis autopilot system
- Automatic flight systems may be capable of controlling the aircraft flight in:
a. Azimuth, elevation and velocity
- An automatic flight control system is fitted with control wheel steering (CWS)
b. Manoeuvring commands may be input by applying normal forces to the control yoke
without first disengaging the autopilot
- During an approach to an autoland at 1500 feet:
b. Localiser is controlling the roll channel, off line channels are automatically engaged
and flare mode is armed
- What type of autoland system would be required for the landing to continue following a single failure below alert height:
c. Fail operational or fail active
- Inputs to the rudder channels initially originate from:
c. Compass gyro and turn and slip gyro
- An automatic flight system which can safely continue with an automatic landing after a system failure is a:
d. Fail operational system
- Altitude Select and Altitude Hold are examples of:
b. manometric functions from the ADC
- During an autoland the caption LAND 2 is illuminated. The system is:
b. Fail passive
- For an autoland system to meet FAIL PASSIVE criteria it must:
b. Withstand a system failure without excessive deviations from flight path
- During an autoland at 50 ft AGL (45’ GA) the pitch control of the autopilot is …………. and the roll control is ………………..
d. flare, localiser
- During an autoland approach:
c. flare is disengaged prior to touchdown at 5’GA
- In an autoland at 1000’ AGL with two autopilots engaged:
d. The engaged roll mode would be LOCALISER.
- An automatic flight control system in which the application of normal forces on the control column allows the pilot to input demands to the autopilot is a:
a. control wheel steering
- If a fault develops in a Triplex auto-pilot system during an approach, the system will revert to:
a. fail passive and the landing may continue.
- Central Air Data Computers (CADC’s) transmit data concerning;-
b. airspeed, altitude and Mach Number.
- Inner loop stability is obtained by;-
c. ‘I’ bar displacement.
- The auto-throttle is used to control some factors during the three primary control modes, they are:
a. EPR, Mach and Speed.
The mode that enables the pilot to manoeuvre his aircraft in pitch and roll by use of the automatic control system is called the;-
a. control wheel steering (CWS )mode that allows the pilot to control the aircraft, and when the wheel is released, the aircraft holds the newly established attitude.
Touch control steering:
c. allows the pilot to control the aircraft with the servomotors disengaged.
A system which can still function without degradation of performance after a failure has:
c. fail operational ability.
During a CAT 2 ILS automatic approach, the source for altitude information is the:
c. radio altimeter which becomes effective below about 2,500 feet.
- Heading hold mode relates to control in:
c. the roll channel via the outer loop control source.
- The system which allows the pilot to control the aircraft with the servomotors engaged is called:
b. control wheel steering.
- The type of automatic landing system which would necessitate a manual landing after a system failure during an automatic approach is:
a. fail passive.
- After a failure of one of the necessary redundant systems below alert height you would:
d. continue descent and land automatically.
- When localiser and glide slope are captured at 1,500 feet during an automatic landing sequence, two other functions will be activated at the same time, they are;-
d. flare mode arm and off line channels engaged.
- A fundamental requirement of a closed loop servo-mechanism is;-
d. feedback.
- ALT HOLD is an example of:
b. Outer loop input to the pitch channel
A rate gyro:
c. Supplies rate and displacement information to the computer
To prevent servo motor runaway from producing excessive demands to the control surface:
b. A torque limiter is fitted
Autotrim is functional:
b. In the pitch channel only with the autopilot engaged
L.NAV is an…………. input to the …………..channel using data from the………..
c. outer loop, roll, FMC
In an aircraft which requires a mach trim system it will apply inputs to the horizontal stabilizer:
d. At high subsonic speeds with the autopilot engaged or not.
- With the Autopilot engaged in the Alt mode the Captain alters the barometric setting. The aircraft:
a. maintains its altitude
- Control wheel steering enables a pilot to:
b. manoeuvre the aircraft in the air while the autopilot is engaged
- Autopilot synchronisation in an aircraft:
b. ensures that, when the autopilot is engaged, the take-over is effected smoothly and
without snatching on the control system
- The rules for the use of Autotrim are that it:
d. operates only in conjunction with the autopilot.
Consider the following statements regarding flight envelope protection:
A High speed protection prevents the airspeed from exceeding Vmo/Mmo
B High angle of attack protection comes in when the aircraft reaches the stalling AoA
d. Neither statement is correct.
The control laws for an autopilot are known as:
d. normal, alternate and direct laws.
An autoland system that, in the event of an autopilot failure, continues to function without degradation of performance beyond the limits required automatic, would be one with the status:
c. fail operational
The Autoland. sequence is considered to be complete when:
b. the autopilot is manually disengaged by the pilot
The Autothrottle will come on automatically even with the A/T switch OFF when:
a. in a FBW aircraft the AoA reaches a critical value called floor
An aircraft on Autopilot is engaged in the VOR mode and loses the VOR signals as it flies through the VOR cone of silence. The autopilot:
d. decouples from the VOR and flies the last heading for a fixed period.
- For an aircraft with a non-synchronised autopilot system, ‘snatching’ of the controls by the autopilot when engaging or disengaging can be prevented by:
a. the pilot ensuring that the aircraft is trimmed out before selecting or disengaging the autopilot
- With the autopilot in CWS the pilot manoeuvres the aircraft and releases control. The aircraft will maintain:
d. attitude at the time of release.
- Autopilot corrections affecting Pitch are carried out by:
b. autotrim and elevators
- For a commercial aircraft operating with a single pilot in IFR the minimum requirement is that the autopilot should have control in:
c. Altitude Hold and Heading mode
