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CHAPTER 2
OPERATION
Prior to using the ALT-621 or ASP-621 indicator, the user should read this manual in its
entirety.
Select the desired units of pressure measurement by pressing the UNITS button as
needed.
A leak check may be initiated by pressing the LEAK CHECK button. This will display a
120 second timer, and the display will also show the gain or loss of altitude or airspeed
experienced during the displayed time period. If the operator wishes to select a different
length of time, the Leak Check button may be pressed repeatedly, which will cause a
reduction in the timer counter in 30-second increments. The timer will not toggle above
120 seconds nor under 30 seconds. Press the Units button to start the timer.
At the end of a leak check cycle, or to abort the cycle, the EXIT button may be pressed,
which will return the display to the normal operating mode.
6
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