Aircraft Avionics Systems Flashcards
What are the basic components of a radio communication system?
Microphone.
Transmitter.
Transmitting and receiving antennas.
Receiver.
Speaker or headphones.
What frequency range is used by most modern voice communication systems?
The VHF band (118.0 to 136.975 MHz.)
What does the term ADF stand for?
airborne direction finder
What is the function of VOR equipment?
Navigation.
Name the components of a typical airborne VOR navigation system:
Receiver.
Antenna.
Frequency selector.
Visual display indicator.
What does DME stand for?
Distance measuring equipment.
At what interval must an ATC transponder system be certified?
Every 24 calendar months.
Why are two antennas usually required for an ILS (instrument landing system) system?
The localizer and glideslope signals are transmitted on different frequencies.
What information does the glideslope beam provide?
Vertical guidance to enable the aircraft to maintain the correct descent angle.
What is the power source for an ELT (emergency locator transmitter)?
An internal battery.
Describe one method of monitoring the signal output during an ELT test:
Tune a communications receiver to 121.5 MHz.
How would you determine if the batteries in an ELT are due for a recharge or replacement?
By looking for an expiration date for recharge or replacement on the battery and/or in the aircraft maintenance records.
At what time is a test of an installed ELT permitted?
During the first five minutes after the hour, and no more than three sweeps.
Where on the aircraft would you expect to find a DME antenna?
Generally, on the bottom of the fuselage in a location that isn’t blocked by the wing during turns.
Describe the shape and location of a transponder antenna.
Either a short blade or a short wire with a ball end located on the bottom of the fuselage.
