Communication And Navigation Flashcards
What most common frequency range is used today
VHF (very high frequency)
What is the function of VOR equipment
Navigation
What does the term ADF stand for
Airborne direction finder
Name components of a typical airborne VOR navigation system
Receiver, visual indicator, antennas, and frequency selector
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 localizer and glideslope because they have different frequancys
What is the power source for an ELT
An internal battery
Describe one method of monitoring the signal output during an ELT test
Tune a communications receiver to 121.5 MHz
How would you determine if the batteries in an ELT are due for recharge or replacement
By looking for an expiration date or in the aircraft maintenance records
At what time is a test of an installed ELT permitted
During the first 5 minutes after the hour and for no more that 3 sweeps
Where on the aircraft would you expect to find a DME antenna
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
Directional , altitude control, turn-and-bank gyro, and altitude gyro
What is the function of the servos in an autopilot system
Actuate the flight controls
Describe the procedure used to route coaxial cable from an antenna to a receiver
Supported every 2 feet, bends should be 10 times the cable diameter and it should be routed separately from other wires
What is a transceiver
Independent transmitter and receiver that shares the same power supply, antenna and tuning device
What are the basic components of a radio communication system
Microphone,transmitter, transmitting and receiving antennas, receiver, and speaker or headphones
What is the purpose of a bonding jumper on a radio shock mount
Provides a low impedance ground return and minimize radio interference from static electricity
What two types of antenna are used with most ADF receivers
Directional loop antenna and a non directional sense antenna
What is the preferred location for a VOR antenna on an airplane
On top if the aircraft, along the center line of the fuselage
What frequency band is used for most aircraft communications
VHF band between 30 and 300 MHz
Is a certificated airframe mechanic allowed to adjust a communication transmitter
No. You need a license issued by the Federal Communications Commission
What are marker beacons
Gives the aircraft position well approaching the runway
What is the indication of the middle marker beacon
Amber light
