CM170407AMA
The battery should never over-discharge. When the MPS49 is not being used for long
periods of time, it is suggested to recharge the battery at least once every 6 months.
1.9.3 INTERNAL LEAK TEST
When carrying out a preliminary Leak Test of the MPS49, in order to establish the correct
operation, it is very important to follow the altitude and airspeed rates that are indicated in
the MPS49 Calibration and Adjustment manual. Higher rate values could cause thermal
effects that would be detected as leaks. If it is not possible to control the indicated rates,
then the stabilization times must be longer, for example 30 minutes.
1.9.4 DMA ADAPTOR KIT USE
Certain DMA pitot static adapter kits require an external vacuum source, to keep the static
adapters fixed to the aircraft fuselage by means of vacuum cups. The MPS49 provides a
vacuum port on the front panel.
1.9.5 STATIC & PITOT PORTS SEALS
Do not use any tools to tighten the MPS49 pneumatics ports. The “AN” fittings on the
MPS49 front panel incorporate an O-ring seal, and only require finger-tight fastening.
For the replacement of the seals after a long period of use, use O-Ring series 2015, 2018
and 2031.
1.9.6 VACUUM AND OVERPRESSURE GENERATION
The MPS49 generates vacuum and pressure inside its internal reservoirs, for controlling the
Static, Pitot and AoA lines. The pumps only run when needed, in order to save power and
ensure a longer operational life.
1.9.7 28V DC SUPPLY
The MPS49 can be optionally powered from a 28V DC power supply (option A0).
Use only cables marked “CBL110929GPA” for powering the MPS49 from a 28V DC
supply! Other cables could damage the instrument.
1.9.8 FIELD ALTITUDE
The pressure control system of the MPS49 needs to know the altitude at which the unit is
operated. On dispatch from Production the Qfe is set to a value of 260 feet.
If the field altitude (“QFE” parameter) is not set correctly, the MPS49 may not be able
to control altitude values below the ambient pressure.
To set the correct field elevation value, follow the instructions given in the Calibration and
Adjustments Manual.
1.9.9 INTERNAL HEATER
The MPS49 can be equipped with an internal heater module (option W1), that allows
operating the unit at temperatures down to -20°C (-4°F).
At power-on, if the internal temperature is too low, the internal heater is started
automatically, and a message appears on the display. As soon as the internal temperature
reaches the minimum value for ensuring nominal operation, the ADTS carries out its regular
start-up procedure.
D.Marchiori Copyright 8
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