Communications Flashcards
How do you adjust the volume of the aural warning system?
not adjustable
With the radio transmit (R/T) - intercom (I/C) switch in the I/C position, where can your intercom transmission be heard?
At all interior and exterior interphone units.
What is the purpose of Voice/both switch?
BOTH : hear the Morse code and voice messages from the station.
VOICE: filters out the Morse code
Where is the observer overhead speaker located?
The observer seat does not have a speaker; audio control panel speaker knob is inoperative.
Explain the EMER/NORM switch on the ACPs
If the pilot were to select EMER, his headset wi11 be
directly connected to NAV 1 and VHF 1.
The aural warning system will be operable.
If the co-pilot selects EMER, his headset is connected directly to NAV 2 and VHF 2.
All ACP services are lost except for NAV 2 and VHF 2.The switch on the observer’s ACP is disabled
When do you need to select the EMER position?
When there is a failure of the audio integrating system,
What happens to circuit breakers in the system when EMER position is selected?
electronic circuits of the audio integrating system to be bypassed and most of the ACP functions will be inoperative.
Explain the public address system (PA) priority
- Pilots
- FA
Pilots can override the FAs PA.
How do you adjust the speaker volume in the cabin, lavatory and galley?
adjusted automatically based on the background noise.
It is at full volume when the APU or an engine is running.
What would you do if the FA told you that the speaker in the galley was not working when she made her PA?
The galley speaker does not work when PA’s are made from the FA’s station.
Where is the inter phone control unit located?
located on the center pedestal
interphone control unit. how many switches? how can you select a mode?
and has four switch lights:
PA
CHIME
CALL
EMERG
Only one mode can be selected at one time.
How would you make a PA to the cabin?
The ACP transmit switch should be selected to PA,
then press the PA switch light.
Either the R/T switch on the control wheel, the ACP R/T switch or the handheld microphone can be used to make the PA.
What occurs when the CALL switch light is pressed?
The switch light illuminates green and there is an aural high-low chime.
A red light illuminates on the overhead exit sign in the middle of the cabin
the FLT light illuminates green on the FA’s handset cradle.
Explain the EMER switch light on the interphone control unit.
It is used to notify the FA of an emergency condition.
When pressed the switch light flashes amber and there is an aural high-low chime.
There will be a red flashing light on the mid-cabin overhead exit sign
the amber EMG light flashes on the FA’s handset cradle.
When the FA calls the flight deck, what should be selected to activate communications?
Select PA on the ACP mic selector switch
At what locations can maintenance use the interphone system to talk with the pilots?
- Avionics bay
- Aft equipment bay
- Refuel/ defuel control panel
- External service panel
Explain the MECH PUSH switch light
This is a call function between the flight deck and the external service panel and the aft equipment bay.
There is a switch light on the three panels will illuminate when one switch is pressed.
It will be accompanied with an aural two-tone in the cabin. The lights remain on for 30 seconds.
What is the purpose of the backup tuning unit?
This radio provides control of COM 1 and NAV 1 If we lose AC Power
What is RTU?
Radio Tuning Unit
What system controls are available on the RTUs?
VHF communication radios VHF navigation radios TCAS Transponders ADF Optional HF radio
What is TCAS Mean?
Traffic Alert and Collision Avoidance System
Explain the two pages of the RTUs.
The RTU has a top page and a main page. The top page allows basic changes to the VHF radios, transponder, ADF and the main page is dedicated to a specific navigation, TCAS or communication system.
Pressing the associated button twice activates Main page.
Example: Press the RTU TCAS button twice to access the TCAS main
What is 1/2 button on the RTU.
This button is the RTU cross-side tuning button. ‘
The RTUs are normally set up for on-side control of the radios. The 1/2 key allows one RTU to display and control the other side.
Color of 1/2 button Cross-side information and how to go back to normal side?
Cross-side information is in yellow. Pushing the 1/2 key a second time will return the radio to a normal on-side display.
When do you use the 1/2 button on the RTU
This feature is used when an RTU fails but the radio and navigation functions still work.
RTU failed: what would it look like?
The display would be blank and cross-side tuning would be inoperative
What would you do if your RTU fails
Cross side tuning needs to be established and inhibiting the failed RTU can do this.
select the RTU INHIBIT switch for the failed RTU.
Both radios are available but cannot be shown on one RTU at the same time. The 1/2 button achieves switching between the two radios.
What happens when you select the RTU INHIBIT switch for the failed RTU.
Cross-side tuning is now available and can be activated by pressing the 1/2 on the serviceable RTU.
Explain the STBY position of the backup tuning unit.
In this position the backup tuning unit is in standby. The frequencies will duplicate COM 1 and NAV 1 frequencies