System Maintenance Manual

Page 7-8 G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air
Revision F 190-00682-01
WARNING
The following step requires moving the stall warning vane. Use caution when
handling the stall warning vane.
8. While monitoring pilot and copilot XM audio, actuate the stall warn transducer on the left wing
leading edge in an up position (for those aircraft equipped with a Safeflight computer, actuate in the
aft position), verify the following:
• Stall warning tone is active.
• Pilot and copilot XM audio is muted.
9. Release the stall warning transducer in the left wing leading edge, verify the following:
• Stall warning tone is silenced.
10. Verify XM audio returns.
7.2.4 XM Audio Suppression Check for Aircraft Without a Tone Generator
GDL69A discrete inputs from stall warning and landing gear control systems as detailed in 005-W0022-
00 “Wiring Diagram, G1000 / GFC 700 King Air C90A/C90GT” are required for aircraft not equipped
with a tone generator.
NOTE
This procedure is applicable only to aircraft equipped without a tone generator as part of
the aircraft audio system. Refer to the appropriate aircraft wiring diagrams to determine if
a tone generator is installed.
WARNING
The following procedure requires operation of the aircraft landing gear. Observe
all applicable safety precautions. Before working in any landing gear wheel well,
ensure that all landing gear and gear door safety devices are installed. Exercise
extreme caution while working around landing gear or in landing gear wheel wells.
Gear warning discrete
1. Reference the King Air C90 Maintenance Manual listed in Table 1-2 and jack aircraft to allow
operation of landing gear.
2. Select the AUX – XM RADIO page on the MFD.
3. Plug a set of headphones into the pilot and co-pilot stations and verify that you can hear the XM radio
playing in both channels. Adjust volume to a comfortable level.
4. Ensure both left and right throttles are at IDLE position.
5. Retract landing gear to the full up and locked position.
6. Verify the landing gear warning horn is active.
7. Verify XM audio is muted in the pilot and co-pilot stations.
8. Increase both left and right throttles forward of IDLE position (towards takeoff position).
9. Verify landing gear warning horn is silenced and XM audio remains muted.
10. On the MFD deselect mute softkey or adjust XM volume. Verify XM audio returns.
11. Extend landing gear to the full down and locked position and return both throttles to idle position.
12. Aircraft may be removed from jacks to accommodate other activities as required.