System Maintenance Manual

Page 7-4 G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air
Revision F 190-00682-01
• Clear PA audio can be heard over cabin speaker and CABIN ICS headsets
• PA selected annunciator on GMA1 flashes ~ once per second during PA address.
11. Repeat Step 10 using copilot hand mic.
7.2.1.2 Intercom System (ICS) Check for GMA 1347D, PN 011-01257-20.
NOTE
This procedure is applicable only to aircraft equipped with GMA 1347D Part Number 011-
01257-20. Reference Figure 3-7 for control button identification and location for the GMA
1347D, PN 011-01257-20.
1. Ensure that the MAN SQ key is off (no light).
2. Adjust GMA1 and GMA2 ICS volume to a comfortable level.
3. One at a time, plug a headset into each left and right CABIN ICS jack location (one headset on
right, one headset on left).
4. Verify the following:
• Two-way communication between each CABIN ICS jack position.
• CABIN ICS positions cannot be heard by the pilot or copilot.
5. Select GMA1 INTR COM button and verify the following:
• Passengers can communicate with each other.
• GMA2 INTR COM light is illuminated.
• The pilot and copilot can communicate with each other and cannot hear passengers.
6. Deselect INTR COM.
7. On GMA1 select CABIN button and verify the following:
• Passengers can communicate with each other.
• The pilot (copilot if GMA2 CABIN selected)
and passengers can all hear each other.
• On GMA1 deselect CABIN button.
8. Repeat step 7 using GMA2.
9. Select CABIN button on both GMAs and verify the following:
• Passengers can communicate with each other.
• The pilot and copilot can communicate with each other and the passengers.
10. Deselect the CABIN button on both GMAs.
11. On both GMAs select COM1 MIC and AUDIO.
12. Ensure INTR COM is deselected on GMA1 or GMA2. Verify an active (green) COM1 frequency
is displayed on both PFDs.
13. On GMA1, select PA and verify the PA select annunciator is illuminated on GMA1. Verify
COM1 active frequency is displayed white.