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CHAPTER 1
GENERAL INFORMATION
Description of the PS-425 Pitot-Static Test Box
The PS-425 Air Data, pitot-static test box is a digital display tester used to test aircraft
altimeters, airspeed indicators, pitot-static systems, and other vacuum and low-pressure
devices. This test box incorporates transducer sensor technology that is largely immune
to the failures and costly repairs associated with analog instruments.
The PS-425 incorporates a digital instrument model TST-621-35. Altitude is displayed in
feet, with increments of 2 and 5 feet. Airspeed is displayed in knots. Vertical speed is
indicated in feet per minute.
The PS-425 is powered by 8 D-size batteries or an external power adapter. The vacuum
and pressure sources are derived from independent manual pumps, and each pump has its
own reservoir, thus eliminating the complexity and maintenance of an additional
pressure/vacuum selector valve. The tester can simulate pressure and vacuum suitable for
up to 35K ft and 500 Knots.
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