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2-6 Main Altimeter

1.
The altitude window displays the current aircraft altitude in ten thousands, thousands, hundreds and tens. The window is blocked by a red OFF flag when the power supply is lost and a black NEG flag when the indicated altitude is negative.
2.
Each revolution represents 1000 feet of altitude.
3.
The Baro knob sets the barometric pressure.
4.
The left window shows the barometric pressure in millibars (mb) and the right one in inches of mercury (inHG).