System Maintenance Manual

G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 7-3
190-00682-01 Revision F
7.2 GMA 1347D Audio Panel
Original GMA 1347D Reinstalled
No software/configuration loading or testing is required if the removed GMA 1347D is re-installed. This
does not include units that were returned for repair as their software and configuration files are deleted
during the repair testing process. Continue to the final return-to-service checks in Section 8.
Original GMA 1347D Installed in Opposite Locations for Troubleshooting
If the original GMA #1 and GMA #2 are installed in opposite locations, configuration loading is required.
See Section 3.9, and then continue to the GMA 1347D Test (Section 7.2.1).
New Repaired or Exchange GMA 1347D Installed
If a new repaired or exchanged GMA 1347D is installed, the correct software and configuration files must
be loaded to the unit. See Section 3.9, and then continue to the GMA 1347D Test (Section 7.2.1).
7.2.1 GMA 1347D Test
Except for marker beacon operation, an in-aircraft checkout may be performed in the aircraft with known
good microphone, headset, and speaker.
7.2.1.1 Intercom System (ICS) Check for GMA 1347D, PN 011-01257-00.
NOTE
This procedure is applicable only to aircraft equipped with GMA 1347D Part Number 011-
01257-00. Reference Figure 3-6 for control button identification and location for the GMA
1347D, PN 011-01257-00.
1. Ensure that the MAN SQ key is off (no light).
2. Adjust GMA1 and GMA2 ICS volume to a comfortable level.
3. Plug in a headset at each COCKPIT ICS position. 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 position cannot hear the pilot and copilot.
• CABIN ICS positions cannot be heard by the pilot or copilot.
5. On GMA1 select COM1 MIC and AUDIO.
6. Ensure INTR COM is deselected on GMA1 or GMA2. Verify an active (green) COM1 frequency
is displayed on both PFDs.
7. On GMA1 or 2 select PA and verify the PA select annunciator is illuminated on GMA1 and
GMA2. Verify COM1 active frequency is displayed white
8. Initiate passenger address using pilot’s headset boom mic by keying the pilot’s PTT. Verify the
following:
• 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.
9. Repeat Step 8 using pilot hand mic.
10. Initiate passenger address using copilot’s headset boom mic by keying the copilot’s PTT. Verify
the following: