CM170407AMA
• In DYNAMIC MEASURE mode, the airspeed/Qc/Pt channel stays in MEASURE
mode, while the altitude/Ps channel remains under control.
The current mode is always indicated in the lower-left corner of the Status Screen (FIG 5).
NOTE while in the mixed MEASURE/CONTROL modes, the MPS49 will automatically
switch to CONTROL mode if any problems are detected.
4.2.3 VENT AND “AMBIENT PRESSURE REACHED” MODES
The Vent mode is used to vent the pitot and static ports of the MPS49 to the ambient
pressure condition. The “Ambient Reached” mode is the operation mode that follows a
successful venting procedure.
For more information about the venting procedure, refer to paragraph 7.3.
The Operator can leave the Ambient Reached mode with the MEAS, CNTR or HALT keys.
NOTE The “Ambient Pressure Reached” mode is similar to the MEASURE mode
(paragraph 4.2.2) with one difference: the Ps, Pt and AoA ports are internally
interconnected, forcing zero Qc and AoA values. The MPS49 may repeat the
venting procedure automatically, if the simulated pressures move away from the
ambient pressure, due to thermal effects.
4.2.4 LEAK MODE
The LEAK mode initiates the automatic leak test and the internal timer/stopwatch
measurement feature of the MPS49.
While in the LEAK mode, the display shows the Leak Screen (FIG 7).
Entry to the LEAK mode is by pressing the LEAK key. If pressed again, the LEAK key
restarts the leak measurement.
A leak test can be interrupted with the MEAS, CNTR or HALT keys.
4.2.5 MODE LIMITATIONS DUE TO LOW BATTERY LEVEL
When the battery level is low, the MPS49 disables the CONTROL mode. The only allowed
modes are MEASURE (paragraph 4.2.2) and VENT (paragraph 4.2.3).
When the MPS49 is connected to AC power, the CONTROL mode will be accessible once
again.
4.3 SCREENS
4.3.1 STATUS SCREEN
The Status Screen (FIG 5) is the most used screen during the ADTS operation. It is
displayed when the MPS49 is turned on. Simulated (actual) values are displayed above the
commanded (target) values, each with its measure unit.
The screen displays four physical quantities:
• altitude, airspeed and the corresponding rates, when the ADTS is controlling
aeronautical units;
• static pressure, dynamic/total pressure, the static pressure rate and the
dynamic/total pressure rate, when the ADTS is controlling pressures;
• AoA or Ps2, when enabled;
• Mach number, when enabled.
D.Marchiori Copyright 20
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