Section 905
Digital RPM Indicator
905 - 4 Page Date: 20. April 2002
PilotĀ“s Operating Handbook
EXTRA 300S
905.5 PERFORMANCE
Not affected.
905.6 WEIGHT AND BALANCE
Not affected.
905.7 DESCRIPTION OF THE SYSTEM
The operation of the indicator is straight-forward. After power is supplied to the indicator, the
engine is started, and the self tests are performed, the default display of the engine RPM
appears on the display. The default display is insured via the use of internal timers that will
restore the display to the current RPM even in the event that one of the panel buttons
becomes stuck or defective.
Internally, two independent tachometers watch the pulses received from each magneto.
Each tachometer is accurate to less than 1 RPM and can be individually enabled/disabled
via buttons on the face of the indicator.
RPM RANGES
Engine operating ranges are indicated on the large green, yellow, and red LEDs.
This LEDs are located on the upper right corner of the indicator face.
MAGNETO-CHECK
Three small LED magneto system alert indicator lights are located within the "Status" area
on the upper left corner of the indicator face.
The left and right red LED alert indicator lights, when illuminated, indicate, because of loss
of ignition signal to the tachometer, a possible malfunction of the respective left or right
Magneto-Control
Operation placard:
Press-and-release
Operation placard:
Press-and-hold
Hours Clear Trap
L DIM R
Status
RPM-
restriction
RPM range
buttons
Display
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