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specific leak test required. This information is necessary to create/define the appropriate
and safe ATP Leak Test profile.
d) From the ATP Leak Test GUI screen, select the Leak Test parameters as required.
Select “Run”. Depending on the configuration of the ATP Leak Test, the automated leak
test process will begin.
e) If Pt Leak Test was selected it will be tested 1st. This test is always performed while Ps
is at ground “ambient pressure”.
Note
:
•
If Ps ALT is not at ground pressure, a Go To Ground will be performed before
starting the Pt Leak Test.
•
If Ps Low ALT was selected it will be tested second. If Ps High ALT was
selected, it will be tested third.
•
At the conclusion of the ATP Leak Test, the 1811NG will automatically perform
a Go To Ground function and the following screen will display the results (see
Figure 54).
Figure 54
ATP Leak Test Results
f) This concludes the ATP Leak Test.
C. Applying Leak Correction
If the leak rate does not exceed 2 kts/min or 50 ft/min, record the leak rate of the Test Set and
hoses so that the values can be subtracted from the aircraft’s leak test. The calculated value
removes the leaks caused by the Test Set and hoses and
isolates the aircraft systems’ leak
rate.