13-80 INSTRUMENTS (AND AVIONICS) / PITOT-STATIC-ANGLE OF ATTACK (AOA) SYSTEM
ICON A5 / MAINTENANCE MANUAL CHANGE C2
4. Drape the hose up to the upper wing surface to remove any strain on the hose that could cause
the tacky tape to slowly peel off.
5. Close the Pressure Control, Pressure Vent, Vacuum Control, and Vacuum Vent valves.
NOTE: DO NOT Over tighten the valves
6. Open the Crossbleed valve.
7. On the front panel of the PS-525 tester, ensure that the Pressure Pump and Vacuum Pump
switches are both OFF.
8. Power on the PS-525 to 12 volts by pulling up on the power switch in the center of the box to
unlock, then swinging the switch down to +12 V.
The system will go through a boot cycle then should display as shown in the top photo with a variation
in altitude depending on the ambient conditions of the day. Note the altitude shown as a reference for
future steps.
9. Switch on the Vacuum Pump until it reads 15-20 inHg on the Vacuum Reservoir indicator.
10. Carefully open the Vacuum Control valve. It will turn approximately 3/4 of a turn (counter-clock-
wise) before the valve opens. Climb the altitude on the display no faster than 4,000 ft/min to
approximately 1000 ft greater than the indicated number with the Vacuum Control valve closed
and the Vacuum Vent open. Carefully close the Vacuum Control valve.
NOTE: In the above example the altitude should be increased to approxi-
mately 1066 ft.
NOTE: Should you exceed the desired altitude, carefully open the Vacuum
Vent to bleed off the altitude until the desired altitude is indicated.
11. Press the Leak Check button under the Altitude display.
12. Press Leak Check two more times until the screen indicates 60 sec, then press the Units button
to start the leak check.
NOTE: The ICON standard is no more than a 50 feet total leak over 60
seconds.
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