Chapter 12 - Aircraft Avionics Systems - Oral Questions 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 communications systems?
VHF band, 118.0 to 136.975
What does the term ADF stand for?
Automatic Direction Finder
What is the function of VOR equipment?
Navigation
Name the components of a typical airborne VOR system
Receiver,
antennas,
frequency selector and
a visual display indicator
What does DME stand for?
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 an ELT test
Tune a comm receiver to 121.5
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 times 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?
Usually on the bottom of the fuselage so that it 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 an altitude sensor
What is the function of the servos in the 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 (directly if possible)
