11.5 - Avionic Systems Flashcards
You fly from Cardiff which has an actual pressure of 1013 (hec pascal) to Edinburgh at an indicated altitude of 1000ft. What is your altitude over Edinburgh when sea level pressure is 1025 (hec pascal)
1360ft
Which of the following statements is true concerning ADC data calculations
The analogue ADC calculates all outputs in 3 modules at the same time
What does the slaving annunciator of a compass system indicate
Indicates the difference between flux valve heading and the heading indication
Which statement is correct about compass compensation
The deviation is recorded on the ground during a 360 degree turn
Which components are used to measure the motion along the aircraft axels
Rate gyro
What is the purpose of a stick shaker
To simulate the effect of a real stall on the flight controls
Given an aircraft without a pressurised cabin, on which a leak has occurred in the static system while the aircraft is in level flight, which indications do you get
Altimeter shows slightly increasing values
Vertical speed indication shows correct data
Airspeed indicator slightly higher
Which flight deck indications occur if the pitot tubes are completely blocked
Airspeed indicators show decreasing values
Which parameter has the greatest effect on the static source errors (SSE)
Mach Number
Concerning pitot static systems, what happens if there is an increase of water and the traps are already full
Instruments fluctuate, vert speed and alt normal function, airspeed is zero
Which of the following statements are true for the pressure transducers used in ADC’s
In a digital ADC same transducer type is used for static and pitot pressure
An aircraft is on the ground and the altimeter is set to QNH pressure. What height is displayed
Ground sea level, if QFE would = 0
Airport Elevation
Which is correct about the ADIRU
The ADIRU has no pressure transducers but the computational part of the DADC and an IRU are intergrated
Why does a vertical gyro required an erection system
Ensure gyro axis is vertical with the reference to the surface of the earth
Hoe does the stick shaker move the control coloum
A motor causes the control coloum to vibrate
What is deviation
It is the angle between the magnetic north and compass north
Compass
Deviation
Magnetic
Variation
True
What is the function of the SSEC circuit in an ADC
The SSEC carries out a temperature compensation for the Mach module
Why is there a difference between SAT and TAT indication
During flight the TAT is higher than the SAT due to the effect of ram rise
The altimeter is set to the standard reference pressure and the actual sea level pressure decreases during flight, which is true
The pilot must adjust the baro setting to the new sea level pressure
Which is indicated by pneumatic airspeed indicators
indicated Air Speed (IAS)
What is the purpose of the stick shaker
To simulate the effect of a real stall on the flight controls
Why is bandpass filter fitted in the yaw damper computer
To limit any changes for the yaw rate gyro
Which auto throttle mode is automatically selected when the autopilot is in the vertical speed mode
Speed mode
How can a heading on the control panel be selected
Heading selected mode
When are autopilot upper modes available
Selectable when autopilot is engaged to CMD
How does the pilot know when the aircraft is not correctly trimmed
When a steady elevator deflection is required to maintain a steady altitude
Which mode of the thrust rating system provides the maximum thrust value for permanent operation
Maximum continuous thrust (MCT)
What does the autopilot engage interlock monitor
Monitors all signals the autopilot needs for the inner loop in CMO and CWS
Which autopilot controlling mode is used during cruise
Auto throttle uses speed mode and controls either a selected or FMC calculated speed or Mach number
What is the flight director used for
To assist the pilot to fly the aircraft manually
What is required to create a lateral flight plan in the FMC
The company route number tells the FMC how to create the flight plan from the navigational database
What happens if the auto throttle is engaged and a throttle lever is moved manually
The auto throttle disengages automatically
When can the autopilot control the speed of the aircraft
During decent
Why are RF lines used
To transport radio signals with no interference
What is the service interphone used for
Communicate with mechanics via jacks around the aircraft
What’s the frequency 121.5Mhz used for
VHF emergency frequency
Why is an antenna coupler used on a HF communication system
To make sure the antenna length is electrically married to the frequency in use
Which statement correctly represents the relationship of frequency and antenna size
Higher the frequency, shorter the antenna
Which statement is true for ACARS
It is used for manual and automatic data transfer between the aircraft and the ground in both directions
What does the cockpit voice recorder (CVR) record
Captain, FO and third crew member audio signals and audio from the area mic
Why are static discharges fitted to an aircraft
To discharge high static charges in flight, which generate high voltages and disturb radio reception
Which priority sequence is used in a passenger address system
Cockpit crew, cabin crew, pre recorded announcements and boarding music
Which frequency’s does the portable emergency located transmitter (ELT) transmit on
121.5Mhz, 243Mhz and 406Mhz only
Which method is used by the ILS receiver to determine which marker beacon the aircraft is overflying
Each beacon uses different transmitter frequencies
How does DME measure distance
The time between the interrogation and reply signal is proportional to the distance to the station
Where is the weather scanner located
Located under the nose radome, and transmits the radar beam 180 degrees sweep in front of the aircraft
What is the purpose of the two antenna fitted in an ADF system
Two antenna signals are required to determine correct direction
What do the different colours on the weather radar mean
Red shows worst weather, yellow and green show less severe conditions
What is automatic VOR
VOR frequency is automatically tuned
How can the fixed ELT be activated
It is automatically activated when an acceleration of 5G in the longitudinal axis is exceeded
Which is the frequency of the wave length of 20M
15Mhz
Which statement is correct about TCAS
Detects other traffic if they have active transponders
What is the maximum height indicated on a radio altimeter
2500ft
Which height is measured by the radio altimeter
Height above the ground
What is the purpose of the TA settings on the TCAS control panel
Gives traffic advisories and shows the white and amber traffic lights on the ND. RA’s are not available
What is the purpose of fans
To improve aircraft comms, nav and ATC surveillance
What happens when you apply a force to a gyro which acts in the direction of its axis
It will move in that direction, but there is no change in the direction of the gyro rotational axis
Where are the engine instruments located on the flight deck
They are located in the center instrument panel
Why is an over speed warning system fitted
To give an aural warning when maximum allowable speed is exceeded, independent of the indication
When can the autopilot control the speed of the aircraft
During cruise
Yaw damper deflects in which direction
The opposite direction of the yaw motion
The EFIS display is divided into 2 important areas of information, what are they
Primary Flight Display (PFD) and Navigation Display (ND)
Which method is used to disconnect the auto throttle system
Pushing either throttle lever disconnect push button
What functions does the audio selector panel provide
It connects the microphone to the selected communication system and all the selected audio signals to the headphones
How is the battery of the portable emergency locator transmitter activated
Automatically when it comes into contact with water
How can the accurate position be determined using GPS
By using ground based radio stations to measure the aircraft position
Which method is used by the ILS receiver to determine which marker beacon the aircraft is overflying
The morse code is different, but all beacons use the same frequency of 75.0 MHz with the same modulation
Why are there two static ports for each static pressure system
To compensate for pressure differences due to side slip manoeuvres of the aircraft
The Underwater Locating Beacon (ULB) is activated
By water entering the ULB and automatically switching it on
Which system will give a warning if the aircraft flies too low an airspeed
The stall warning system
What does it mean when the flight director roll bar moves to the left
The rudder must be moved to the left
How does the FMS determine the current position of the aircraft durning flight
It calculates the present position from the most reliable sensor (IRS, GPS, radio NAV)
Which mode of the auto throttle system is used during take off
Thrust mode (N1 or EPR)
What does the inner loop of an auto pilot control
It controls the attitude of the aircraft and is always active
Why are RF lines used
To transport a radio signal without disturbances
How is the battery of the portable Emergency Locator Transmitter (ELT) activated
Automatically when it comes into contact with water
Why are static discharges fitted to an aircraft
To discharge high static charges in flight which generate high voltages and disturb radio reception
What happens if the pilot inadvertently operates the manual trim with auto trim engaged
The auto pilot disconnects and the trim system reverts to manual trim operation
Which statement is true for the Flight Management System (FMS)
It calculates vertical and lateral navigation data for a safe and economical flight
What is a Flight Director used for
It assists the pilot to fly the aircraft manually
Which statement is true for VHF 1
It can be selected from any Radio Management Panel (RMP).
What is automatic VOR
The bearing is automatically indicated on the RMI or ND
Which priority sequence is used in a Passenger Address (PA) amplifier
- Cockpit crew
- Cabin crew
- Pre recorded announcements
- Boarding music
What is the code 7700 used for
Code 7700 is an emergency code
Where is the weather radar scanner located
It is located under the nose radome and transmits the radar beam in a 180deg sweep in front of the aircraft
Which of the following statements are true for a differential GPS
It uses an additional ground station to increase the accuracy of the GPS position
