K114 Issue No. 9
5 - 10
Testing and Fault Finding
Controller Stability
This section verifies the control stability.
(1) Press LEAK MEASURE/CONTROL to turn the pressure controllers on.
“Aim” replaces “Leak Measure” on the display.
(2) Enter a Ps aim of 510 mbar with a rate of change of 204 mbar/min. by
pressing the following: ALT/Ps, 5, 1, 0, ENTER, Ps RATE, 2, 0, 4, ENTER.
(3) Enter a Qc aim of 0 mbar with a rate of change of 204 mbar/min. by
pressing the following: SPEED/Qc, 0, ENTER, RATE, 2, 0, 4, ENTER.
(4) Press Ps and wait for the aim values to be achieved.
(5) If auto-zero is enabled, wait for an auto-zero to take place. During auto
zero, the valve state changes on the mimic panel and the display shows “Zero” in
place of the airspeed aim value. The time to auto-zero should be less than 1
minute from achieving the aim value.
(6) Wait for a minimum of 20 seconds after auto-zero before proceeding.
(7) Observe the measured values of Ps and Qc on the display for 1 min.
(8) Check that the displayed value of Ps remains within ±0.068 mbar.
(9) Check that the displayed value of Qc remains within ±0.068 mbar.
Note: If a further auto zero takes place, allow the display to stabilize
following the auto zero before proceeding.
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