Communication and Navigation systems Flashcards
What are the basic autopilot components?
Sensing elements (Gyros), Output elements (Servos), Command elements (Flight controller), Computing elements
(Computer and Amplifier).
What are the sensing elements of an autopilot system?
Attitude, Directional and turning gyros and an altitude sensor.
What are the actuating (output) elements of an autopilot system?
Servos that operate the control surfaces.
What is the function of the servos in an autopilot system?
The servos actuate the flight controls.
What is the most common communication system in use?
VHF band 118.0 to 136.975 Mhz.
What is VOR equipament used for?
navigation
What are the components of a typical VOR system?
A receiver, visual indicator, frequency selector, antenas and power supply.
What is an ADF?
automatic direction finding
Why are two antenas or single multi-element antena usually required for an ILS system?
One for the LOCALIZER and the other for the GLIDE SLOPE receivers.
What information does a glide slope radio beam provide?
Vertical guidance for correct angle of descent.
what is a dme?
distance measuring equipment
Where should DME antenas be located?
Generally on the bottom of the aircraft fuselage in a location that isn’t blocked by the wing.
What powers an emergency locator transmitter (ELT)?
internal battery
What is one method used to monitor the output signal during an ELT test?
A VHF communications receiver turned to 121.5 Mhz.
What time of day should you perform the maintenance tests of an installed ELT?
During the first 5 minutes after the hour for no more than 3 sweeps, at any other time they should be coordinated with the
nearest Control Tower of Flight Service Station.
How often does the ATC Transponder require certification? (Ref.: 14 CFR 91.413)
every 24 calendar months
How may the determination be made to replace or recharge the batteries in an ELT even though the set
operates? (Ref.: 14 CFR 91.207 (c)(2) )
The expiration date for replacing or for recharging is marked on the outside of the transmitter and entered in the aircraft
maintenance record.
What are the basic components of a radio communication system?
A microphone, transmitter, transmitting and receiving antenas, receiver, and speaker or headphones.
Describe the shape and location of a transponder antenna.
Either a short blade or a short wire a ball end located on the bottom of the fuselage.
What is the purpose of a bonding jumper from a radio shock mount to the airframe?
To provide low-impedance ground return.
Describe the procedure used to route coaxial cable from an antena 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.
