DMA MPS49 - Leak Screen; Fig 6 Operational Mode Indication, with and Without Aoa Label

CM170407AMA
NOTE The pressures that relate to the AoA are Pd2 and Ps2. Ps2 is the absolute pressure
available on the AoA outputs on the front panel. Pd2 is also called AoA, and is the
difference between Ps2 and Ps.
The physical quantity in the lower-right corner can be selected by pressing the SHIFT and
'–' keys. The possible choices are:
• airspeed/Pt/Qc rate (depending on the current control mode);
• AoA;
• Ps2;
• Mach number.
Each quantity can be selected by pressing on the touch screen, or using the keyboard
 and  keys.
A red frame indicates the currently selected quantity.
The lower part of the screen displays:
• the current operational mode of the ADTS (refer to chapter 4.2). Touching this area
of the screen is equivalent to pressing the MEAS or CNTR key. A small label (FIG
6) indicates when the MPS49 is generating an AoA pressure, that is not displayed at
the moment. The label is hidden when the AoA is zero, or when it is displayed on
the screen.
• the actual AC/battery status. A small diagram displays the battery charge level.
When the AC is connected, the battery is displayed full with a black 'C'.
• up to three colored buttons. Their function can vary with respect to the current
operational mode. The buttons can be activated either by touching them or pressing
the SHIFT and one among the '7', '8' and '9' keys.
FIG 6 OPERATIONAL MODE INDICATION, WITH AND WITHOUT AOA LABEL
4.3.2 LEAK SCREEN
The Leak Screen (FIG 7) is shown when the MPS49 is in LEAK mode. It displays:
• the measured leaks (in the left part of the screen);
• the currently measured rates (in the right part of the screen);
• the elapsed or remaining time in seconds.
The leak values are calculated by subtracting the current values from the values at the
beginning of the leak test. Therefore, a decreasing quantity will have a negative sign.
NOTE The leak values for airspeed, Qc and AoA are calculated by comparing the current
Pt (or Ps2) with the Ps at the beginning of the test. In other words, they are a
measure of the Pt (or Ps2) leak rate, and are independent from any altitude/Ps
leaks.
The displayed rates are the currently measured rate values.
D.Marchiori Copyright 21