Airframe- Communication and Navigation Systems Flashcards
what are three basic autopilot components?
gyros, servos, and an amplifier
what are the sensing elements of an autopilot surfaces
a directional gyro, turn-and-bank gyro, altitude gyro, and altitude control
what are the actuating elements of an autopilot system?
servos that operate the control surface
what are the basic components of a communication system?
a microphone, transmitter, transmitting antenna, receiving antenna, receiver, and headset or loudspeaker
what is the most common communication system in use?
very high frequency (VHF) system
how often does the ATC transponder require certification?
every 24 calendar months
what are the components of a typical airborne VOR system?
a receiver, visual indicator, frequency selector, antennas, and power supply
why are two antennas or a single multi-element antenna usually required for an ILS system?
one for the localizer, and one 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
what is VOR equipment used for?
navigation
where should DME antennas be located?
on the lower surface of the aircraft in a position that will not be blanked out by the wings in a bank
what is an ADF?
an automatic direction finder
what type antennas do most transponders have?
a short stub usually mounted on the lower surface of the fuselage
what powers an emergency locator transmitter (ELT)
a self-contained battery
what is one method used to monitor the output signal during an ELT test?
a VHF communications receiver tuned to 121.5 MHz
how may the determination be made to replace or recharge the batteries in an ELT even though the set operates?
the expiration date for replacing or for recharging is marked on the outside of transmitter and entered in the aircraft maintenance record
what is the purpose of a radio shock mount bonding jumper?
to provide a low-impedance ground return
what time of day should you perform the maintenance tests of an installed ELT?
the test should be conducted during the first 5 minutes after the hour at any other time they should be coordinated with the nearest FAA control tower or flight service station
