Airframe Chapter 12 Flashcards
What are the basic components of a radio communication system?
A microphone, transmitter, transmitter and receiver antenna, receiver, and speaker or headphones.
What frequency range is used by most modern communication systems?
The VHF band between 118 and 136.975 MHz
What does the term ADF stand for?
Airborne direction finder.
What is the function of the VOR equipment?
Navigation.
Name the components of a typical airborne VOR navigation system.
A receiver, antennas, frequency selector and 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 localized and the glideslope signals are transmitted on different frequencies.
What information does the glideslope beam provide?
Vertical guidance to enable the aircraft to maintain the correct descend angle.
What is the power source for an ELT (emergency located transmitter)?
An internal battery.
Describe one method of monitoring the signal output during an ELT test?
Tune a communication receiver to 121.5 MHz or 243 MHz (Military)
How would your 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 then 3 sweeps.
Where on the aircraft would you expect to find an 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 an 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.
