Aircraft Avionics Systems Flashcards
What are the basic components of a radio communication system?
A microphone, transmitter, transmitting and receiving antennas, receiver and speaker or headphones.
What frequency range is used by most modern voice communication system?
VHF band
118.0 to 136.975 MHz
What does the term “ADF” stand for?
Airborne Direction Finding
What is the function of VOR equipment?
Navigation
Name the components of a typical airborne VOR navigational system.
A receiver, antennas, frequency selector an a 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 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?
an internal battery
describe one method of monitoring the signal output during and ELT test?
Tune a communication receiver to 121.5 MHz
How would you determine if the batteries in an ELT are due for 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(s) is a test of an installed ELT permitted?
During the first 5 minutes after the hour and for no more than 3 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.
Name the basic components of an autopilot system
Gyros, servos, a controller and an amplifier or computer.
What are the sensing elements of an autopilot system
Attitude, directional and turning gyros and altitude sensor
What is the function of the servos in an autopilot system?
the servos actuate the flight controls
What is the purpose of a bonding jumper from a radio shock mount to the airframe?
To provide a low-impedance ground return
Describe the procedure used to route coaxial cable from an antenna to a receiver?
The cable should be supported every 2 feet, bends should be 10 times the cable diameter, and it should be routed separately from other wires.
