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Units:
Actual:
Target:
Important note:
When either the Pitot or Static Mode is changed to Control (C), BOTH
Pitot and Static outputs are automatically changed to Control. During normal operation
you want both Static and Pitot outputs connected to the aircraft and both of them achieving
a specific target value. Leaving one output in Measure or Leak and the other output in
Control should be done only during a Leak check.
The 'MEASURE' to 'CONTROL' transition
When either a Pitot or Static output is changed from Measure or Leak to Control mode, a
sequence of events takes place that needs explaining. Since the controlling portion of the 6300-
M3 is isolated from the output during Measure or Leak modes, it will usually be at a pressure
quite different from that at the output. Simply introducing the controlling section into the
pneumatic system connected to the output will cause a surge in pressure (or vacuum) at the
output. To prevent such a surge, the 6300-M3 measures the pressure at the output, shuts-off
the output from the internal 6300-M3 pneumatics, and then controls the pressure within the
internal control mechanism to match the pressure at the output. Once this is done, the 6300-
M3 controlling section is connected to the output. This process is termed as Equalization.
While the 6300-M3 is undergoing this process, the term 'EQZN' is displayed on the main
screen in place of the "Actual" value. The whole process usually takes about 15 seconds or
less to complete. During the 'EQZN' process, the Main Operating screen will appear as shown
below.
Units:
Actual:
Target:
Once the Equalization process is complete, the Actual values appear on the Main Screen.
Following the Equalization process, only when the actual value on the Static output is less
than 2000 feet from Ground and the Pitot output is less than 150 knots, the 6300-M3 will
automatically inject a small vacuum on the Static output and a small pressure on the Pitot
output. This is done to determine the volume of the Pitot and Static system on the aircraft, so
that the 6300-M3 can automatically adjust the gain of it's control mechanism. Due to this, the
knots
M
101.2
20.0
knots
C
EQZN
20.0
26
Feet/min
Feet
3500
1005
3000
Feet/min
Feet
EQZN
EQZN
3000
L
0
C
0
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