56-101-01178 Revision K
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Main Menu: Go To Ground
Figure 34
Go to Ground Confirm Screen
1.
The user can select “Go To Ground” from the Main menu, while in either Leak
Measure or Control mode. At the conclusion of Go To Ground, the Test Set will
perform an AutoZero function to trim off any small Qc pressure offset that may have
crept into the Qc transducer typically due to thermal component (Test Set Warming or
cooling). The AutoZero function greatly improves the low airspeed (< 50 kts)
measurement accuracy. Also, the Test Set will remain vented to ambient until the
Control mode is selected.
Note:
There are two circumstances where an AutoZero function is performed: (1) at
the conclusion of Go To Ground function and (2) approximately 1 minute if CAS is
< 50 kts and the Test Set is in the Leak Measure mode.
Figure 35
Conclusion of Go To Ground
2. When the AutoZero function is performed, the CB valve (Sv_CB) is OPEN.