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XT 582 Maintenance Manual
Issue 1.0
September 21st 2005
Page 66
Leaks, moisture and obstructions are the major problems associated with Pitot Static systems.
Provided these problems are adequately addressed, the Pitot Static system is essentially maintenance
free.
If it becomes necessary to blow through either the Pitot or the Static system in order to clear blockages
etc the system should be disconnected at both the instrument ends and blown out with clean, dry air
from that end. (Ensure that all lines tee’ed into the static system are disconnected).
Avoid blowing through by mouth as this will introduce moisture. Never blow air through from the source
end, particularly with the instruments connected, or they will be ruined.
34.10.20 Testing the Pitot System
The Pitot system is to be tested for leaks by applying a pressure at the Pitot head sufficient to cause
the airspeed indicator to read 90 knots. There shall be no indication of restrictions in the application of
the pressure and no decrease in the reading when the system is sealed for at least 10 seconds.
Testing the Static System
Testing the Pitot can be achieved by carefully using a syringe and flexible tube, sealing it to the front of
the Pitot entrance and introducing a very small amount of pressure. The amount of pressure is very
minimal. At 46.3m/s (90kts) the pressure necessary is only 134mm water or 1.34kPa (0.194PSI). In a
50cc syringe this will equate to somewhere in the region of 2 - 5mm of travel. If the flexible tube is long
enough the testing can be done from the cockpit, while looking at the instruments, alternatively a helper
will be required.
Outside Air Temperature Gauge
The air temperature reading is taken by the SkyDAT box that is located behind the passenger, above
the engine.
Other Instruments:
Other instruments that need to be tested (such as the Air speed indicator and the Altimeter) should be
calibrated against an independent instrument, or sent to a service agent for checking and calibration.
CAUTION
ENSURE THAT THE PITOT SYSTEM IS NOT PAINTED ORCOVERED OVER AS THE AIRSPEED
INDICATORS WILL CEASE TO FUNCTION.
CAUTION
THE PITOT IS A VERY SENSITIVE INSTRUMENT, AND IS EASILY DAMAGED, READ THE
INSTRUCTIONS CAREFULLY BEFORE CONTINUING WITH THE TEST PROCEDURE.
UNDERSTAND THAT THE AMOUNT OF PRESSURE NEEDED TO TEST THE PITOT IS LOW.
NEVER USE COMPRESSED AIR, OR BLOW INTO A PITOT SYSTEM.