GE ADTS542F User Manual page 94

6-2
Pressure leak check
This procedure verifies that the unit is leak tight under positive pressure conditions.
1. Select "CONTROL".
2. Toggle Pressure Aeronautical Units to mbar.
3. Swipe screen across right to left to select the Rate Timer and set the "WAIT" time to 5 minutes
and 0 seconds and touch the "tick" icon.
4. Set the "TEST" time to 1 minute and 0 seconds and touch the "tick" icon.
5. Swipe back to the control mode.
6. Touch the Ps "AIM" value to highlight it.
7. Use the numbered keypad to input the new value: 1050.00mbar, set rate aim to 500mbar/min
and touch the "tick" icon.
8. Touch the Qc "AIM" value to highlight it.
9. Use the numbered keypad to input the new value: 860.00mbar, set rate aim to 500mbar/min
and touch the "tick" icon.
10. Wait until the Ps and Qc have reached the "Aim" values and stabilized (indications will be
green).
11. Select "MEASURE".
12. Swipe across to select the Rate Timer.
13. To start the timer, touch the "play" icon. The timer starts counting down, the elapsed time
(percentage) indicator turns blue and the word "WAIT" is displayed.
14. When the timer reaches 100%, it starts to count down again and the word "TEST" is displayed.
When the timer reaches 100%, it stops, the elapsed time indicator remains blue and the word
"END" is displayed.
15. The display shows the timed rates with a "T" after each value. Check that the Ps, and Qc rates
are less than or equal to ±0.6 mbar/min. If the rates are greater than this value, allow further
thermal stabilization time and re-test.
Vacuum leak check
This procedure verifies that the unit is leak tight under negative pressure conditions.
1. Select "CONTROL".
2. Swipe across to select the Rate Timer and set the "WAIT" time to 5 minutes and 0 seconds and
touch the "tick" icon.
3. Set the "TEST" time to 1 minute and 0 seconds and touch the "tick" icon.
4. Swipe back to the control mode.
5. Touch the Ps "AIM" value to highlight it.
6. Use the numbered keypad to input the new value: 100.00mbar, set rate aim to 500mbar/min
and touch the "tick" icon.
7. Touch the Qc "AIM" value to highlight it.
8. Use the numbered keypad to input the new value: 0.00mbar, set rate aim to 500mbar/min and
touch the "tick" icon.
9. Wait until the Ps and Qc have reached the "Aim" values and stabilized (indications will be
green).
10. Select "MEASURE".
11. Swipe across to select the Rate Timer.
12. To start the timer, touch the "play" icon. The timer starts counting down, the elapsed time
(percentage) indicator turns blue and the word "WAIT" is displayed.
ADTS542F/552F/553F/554F User Manual
K0553 Revision C