SY204 Communication Systems Flashcards
What are two conditions when the Backup UHF control unit should be used?
Failure of the RMU
Failure of the battery bus
The UHF COMM unit is located in the _______ avionics bay and the VHF COMM unit is located in the ______ avionics bay
Left
Right
UHF radio range is from _______ to ________ megahertz
225.00 to 399.975 (7000 channels)
The backup UHF radio has ___ preset channels
20
Where are the UHF and VHF antennas located?
One UHF antenna on top mounted on the upper fuselage aft of the canopy
One VHF/UHF communications antenna on the lower fuselage in front of the tail fin
What is the difference between HOT and COLD mode on the INTPH switch?
In HOT mode, both microphones are active. (Pressing the ICS KEY/MUTE switch on either PCL will mute all external incoming audio.)
In COLD mode, either the ICS KEY switch or the ICS KEY/MUTE switch on either PCL will activate the interphone. (The KEY/MUTE switch also mutes external incoming audio and key ICS.)
How is power supplied to the ground crew interphone?
Battery switch (in either cockpit)
What is the purpose of the ALTN position switch on the audio control panel?
Moving the switch to ALTN bypasses the amplifier and provides raw audio for UHF comm and aural warnings (also causes the intercom system to become inoperative)
Power to the RMU is provided through the __________ bus
generator
What indication is given when the RMU is on the preflight test page?
The letters “PFT” are shown in the top field.
VHF NAV memory will store a maximum of ___ preset channels
10
To DME hold, press the ______ key.
DMEH
What are the 3 modes of the Transponder?
STBY, ON, ALT
When in BOTH mode, the UHF radio will __________.
monitor Guard and the active frequency and transmit on the active frequency
The RMU preflight test is initiated by ________.
applying power to the RMU
What indication do you see when the squelch is off?
The letters “SQ” are displayed
What indication will you get on the RMU if the backup UHF radio control unit is in operation?
The word “REMOTE” will be displayed.
The INTPH switch is located in which cockpits?
AFT cockpit only
