4-12.2 Talking with system operator from crew telephone station . Perform following procedures when crew-
members at any telephone headset station use telephone system to talk with system operator in dayroom.
a. Connect telephone headset (Figure 4-4) to appropriate telephone headset station jack receptacle (Figure 4-5).
Control volume by adjusting volume switch on headset station.
Crewmember's voice is heard from dayroom speaker and speaker volume is adjusted by setting
speaker volume switch on bottom of speaker to desired loudness.
b. Press PTT switch on headset and speak into microphone using proper call signs. Release switch to hear system
System operator answers crewmember's page by removing handset from hook (hang-up switch) and
responding with proper call sign.
c. After system operator responds, send message.
d. Continue talking until communications are complete. Then unplug telephone headset from headset station.
4-12.3 Talking between telephone stations. Crewmembers at any telephone station talk to other crewmembers at any
other telephone station online by following these procedures:
Perform following procedures at front panel of the respective equipment unless otherwise noted.
Telephone stations online with each other from telephone station selector box are as follows:
telephone stations 1-4; telephone stations 2 and 9-12; telephone stations 2 and 5-8.
a. Connect telephone headset to appropriate telephone headset station jack receptacle.
b. Press PTT switch on earphone and speak into microphone using proper call sign. Control volume by adjusting
volume switch on headset station
Paged headset station should answer page with station location as a call sign.
c. After headset station responds, send message
d. Continue talking until communications are complete, then, unplug telephone headsets from headset station.
4-13 Shutdown procedures. When telephone system is to be shut down for any length of time, perform the following:
a. Make sure BUZZER switch on telephone buzzer station selector panel (Figure 4-2) is off.
b. Make sure telephone headsets with 25-ft extension cord are properly stored in either telephone stowage boxes or
in ROWPU space aft storage area
c. Press telephone system PUSH-ON/PUSH-OFF button to OFF (Figure 4-2). Make sure white indicator light goes
d. Open (OFF) circuit breakers 10P13A-7 on emergency light panel and 3P14 on 24 Vdc power panel