56-101-01178 Revision K
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very small pneumatic channels within the manifold between the proportional control
valves and the transducers. During this test the Test Sets internal manifold mounted
output valves SvPs_Out and SvPt_Out are closed and therefore the Ps and Pt Output
reservoirs are not included in this test.
6. The Vacuum Pump and pressure pumps are tested to verify they are able to achieve
the performance expected.
7. The initialization display window and log file include the Test Set(s) power on cycle
count, # of hours the Test Set has been powered ON, # of hours on the pressure
pump, # of hours on the vacuum pump.
8. At the end of the initialization cycle the Test Set performs a Go to Ground to ensure
both the STATIC (Ps) and PITOT (Pt) ports are at ambient pressure.
Note
: During this power ON initialization Go To Ground phase the Target ROC will
default to a very low rate (2,000 ft/min), the user can change the ROC for that
occurrence but touching the ROC touch zone and changing the Target value.
Note
: After power ON initialization has completed, the Test Set will remain in Leak
Measure mode with the STATIC (Ps) and PITOT (Pt) ports Vented to ambient
and the displayed message will be:
Figure 47
Initialization Display
C. Leak Measure Mode
The 1811NG has two modes of operation,
Leak Measure
and
Control
. The default mode
of operation for the 1811NG is Leak Measure mode. At the conclusion of power ON
initialization the Test Set will be placed in the Leak Measure mode.
While in Leak Measure mode the Test Set is continuously measuring / monitoring the
pressure on both the STATIC (Ps) and PITOT (Pt) ports. The display will be continuously
updated (~ 2 times/second) with the latest pressure measurement results. In Leak
Measure mode, the pneumatic pressure pump, vacuum pump and four proportional control
values (PvPs_V, PvPs_P, PvPt_V, PvPt_P, reference 1811NG Pneumatic diagram) are
off.
When the
Display Setup
is configured for
Aeronautical
mode, the 1811NG has some
additional features and safeguards such as
ALR
and
Leak Test ATP
.