Communications and Navigation Systems Flashcards
What are the basic autopilot components ?
Sensing (Gyros), Servos (Output elements), Command (Flight controller), Computing elements (Computer and Amplifier)
What are the SENSING elements of an autopilot system ?
Attitude indicator, altitude indicator, Directional gyros
What are the actuating (output) elements of an autopilot system ?
Servos that operate the flight control surfaces
What is the function of a servo in a autopilot system ?
The servos that operate the flight controls surfaces
What is the most common communication system in use ?
VHF band 118.0 to 136.975 MHZ
What is the VOR equipment used for ?
Navigation
What are the components of a typical VOR system ?
Receiver, visual indicator, frequency selector, antennas and power supply
What is ADF ?
Automatic Direction Finder
Why are two antennas or single multi element antenna usually required for an ILS system ?
One for localizer, one for glide slope
What information does a glide slop radio beam provide ?
Vertical guidance for correct angle decent
What is DME ?
Distance Measuring Equipment
Where should DME antennas be located ?
Generally on the bottom of the fuselage in location that can’t be blocked by the wing when banked
What powers an Emergency Locater Transmitter (ELT) ?
An 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 the day should you perform the maintenance test of an installed ELT ?
During the first 5 minutes after the hour for no more than 3 sweeps, any other time should be coordinated with Control Tower or Flight Service Station
How often does the ATC transponder require certification ?
Every 24 calendar months
How may the determination be made to replace or recharge the batteries in an ELT even though the set operates ?
Expiration date for replacing or recharging is marked outside the transmitter and entered in the aircraft maintenance record
What are the basic components of a radio communications system ?
Microphone, transmitter, transmitting receiving antennas, receiver, speaker or headphones
Describe the shape and location of a transponder antenna ?
Either short blade or short wire with 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 ?
Provide low impedance ground return path
Describe the procedure used to route coaxial cable from an antenna to a receiver ?
Cable should be supported every 2 feet, bend radius should be 10 times the cable diameter, and it should be routed separately from other wires
