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Buck's RV-8
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Date: 7-16-2008
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Number of Hours: 0.00
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Manual Reference:
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Brief Description: What's on the Buses?
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These items are powered by the Essential Bus:
1. Both of the EFIS Displays, AHRS, EIS, and magnetometer. (Low current draw, and these are my main flight instruments.)
2. Garmin 430W (My primary Comm/Nav/GPS)
3. Aurtopilot (In a critical IFR emergency, an autopilot is a HUGE help in keeping task-saturation levels low.)
4. Transponder (They can't vector you if they can't see you.)
5. A backup starter switch, located on the panel. (Several reasons for this: In the event of a Master Contactor failure or stick-mounted starter switch failure, I can power the E-Bus from the battery using a "Battery Direct" switch, so I can still start the engine and taxi myself to the shop. Also, in the event of an inflight, time-critical need to hit the starter, I don't have to fumble around for the normal "Start Arm" switch first -- I just hit the panel-mounted button.)
These items are powered by the Battery Bus:
1. E-Bus (through a relay and switch).
2. Cockpit lights (It's nice to reach in and get some lights on quickly).
3. Power socket (Allows charging of main battery in the hangar).
4. Garmin SL-30 (Nice to get ATIS and clearance before engine start).
5. Avionics "keep alive" circuits.
EVERYTHING else is powered from the Main bus.
The GRT EFISs can also be powered from a 7.2Ah battery, and the Dynon D-10A has its own internal battery, too.
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