Communications and Navigation Systems

Question 1

What are the basic autopilot components ?

Answer 1

Sensing (Gyros), Servos (Output elements), Command (Flight controller), Computing elements (Computer and Amplifier)

Question 2

What are the SENSING elements of an autopilot system ?

Answer 2

Attitude indicator, altitude indicator, Directional gyros

Question 3

What are the actuating (output) elements of an autopilot system ?

Answer 3

Servos that operate the flight control surfaces

Question 4

What is the function of a servo in a autopilot system ?

Answer 4

The servos that operate the flight controls surfaces

Question 5

What is the most common communication system in use ?

Answer 5

VHF band 118.0 to 136.975 MHZ

Question 6

What is the VOR equipment used for ?

Answer 6

Navigation

Question 7

What are the components of a typical VOR system ?

Answer 7

Receiver, visual indicator, frequency selector, antennas and power supply

Question 8

What is ADF ?

Answer 8

Automatic Direction Finder

Question 9

Why are two antennas or single multi element antenna usually required for an ILS system ?

Answer 9

One for localizer, one for glide slope

Question 10

What information does a glide slop radio beam provide ?

Answer 10

Vertical guidance for correct angle decent

Question 11

What is DME ?

Answer 11

Distance Measuring Equipment

Question 12

Where should DME antennas be located ?

Answer 12

Generally on the bottom of the fuselage in location that can’t be blocked by the wing when banked

Question 13

What powers an Emergency Locater Transmitter (ELT) ?

Answer 13

An internal battery

Question 14

What is one method used to monitor the output signal during an ELT test ?

Answer 14

A VHF communications receiver turned to 121.5 MHZ

Question 15

What time of the day should you perform the maintenance test of an installed ELT ?

Answer 15

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

Question 16

How often does the ATC transponder require certification ?

Answer 16

Every 24 calendar months

Question 17

How may the determination be made to replace or recharge the batteries in an ELT even though the set operates ?

Answer 17

Expiration date for replacing or recharging is marked outside the transmitter and entered in the aircraft maintenance record

Question 18

What are the basic components of a radio communications system ?

Answer 18

Microphone, transmitter, transmitting receiving antennas, receiver, speaker or headphones

Question 19

Describe the shape and location of a transponder antenna ?

Answer 19

Either short blade or short wire with a ball end located on the bottom of the fuselage

Question 20

What is the purpose of a bonding jumper from a radio shock mount to the airframe ?

Answer 20

Provide low impedance ground return path

Question 21

Describe the procedure used to route coaxial cable from an antenna to a receiver ?

Answer 21

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