Communication and Navigation systems

Question 1

What are the basic autopilot components?

Answer 1

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

Question 2

What are the sensing elements of an autopilot system?

Answer 2

Attitude, Directional and turning gyros and an altitude sensor.

Question 3

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

Answer 3

Servos that operate the control surfaces.

Question 4

What is the function of the servos in an autopilot system?

Answer 4

The servos actuate the flight controls.

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 VOR equipament used for?

Answer 6

navigation

Question 7

What are the components of a typical VOR system?

Answer 7

A receiver, visual indicator, frequency selector, antenas and power supply.

Question 8

What is an ADF?

Answer 8

automatic direction finding

Question 9

Why are two antenas or single multi-element antena usually required for an ILS system?

Answer 9

One for the LOCALIZER and the other for the GLIDE SLOPE receivers.

Question 10

What information does a glide slope radio beam provide?

Answer 10

Vertical guidance for correct angle of descent.

Question 11

what is a dme?

Answer 11

distance measuring equipment

Question 12

Where should DME antenas be located?

Answer 12

Generally on the bottom of the aircraft fuselage in a location that isn’t blocked by the wing.

Question 13

What powers an emergency locator transmitter (ELT)?

Answer 13

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 day should you perform the maintenance tests of an installed ELT?

Answer 15

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.

Question 16

How often does the ATC Transponder require certification? (Ref.: 14 CFR 91.413)

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? (Ref.: 14 CFR 91.207 (c)(2) )

Answer 17

The expiration date for replacing or for recharging is marked on the outside of the transmitter and entered in the aircraft
maintenance record.

Question 18

What are the basic components of a radio communication system?

Answer 18

A microphone, transmitter, transmitting and receiving antenas, receiver, and speaker or headphones.

Question 19

Describe the shape and location of a transponder antenna.

Answer 19

Either a short blade or a short wire 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

To provide low-impedance ground return.

Question 21

Describe the procedure used to route coaxial cable from an antena to a receiver.

Answer 21

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.