PIM 417-O
PITOT-STATIC LEAK TESTER TYPE D51600
Issue 5
November 2009
Page 20
V. At the end of the checking period, the screen will display the total leakage over the set time
period, together with a message that the test is completed (
Figure 17
).
Figure 17 Leak Test Completed
W. Pressing START after the initial leak test has been completed restarts the test. The test will
also be restarted if START is pressed when in the Pressure Monitor Mode. Alternatively, if in
place of the START key the +/keys are used, the test will restart at a new Set Point (either
incremented or decremented) .
X. If no further leak tests are to be carried out, press STOP twice to initiate a Vent Cycle. As
before (paragraph 5.0.), the rate the PSLT vents to atmosphere can be controlled via the
STOP key. When vented, the screen will display the caption 'SYSTEM VENTED' and the
VENTED flag appears.
Y. Press the PWR key to switch the equipment off. However, if the equipment is left powered up,
then 5 seconds after the system has successfully vented the display reverts back to the Main
Menu 1 ready to initiate new tests.
6. PRESSURE CONTROL MODE
A. The Pressure Control Mode is used to 1test the accuracy of Airspeed and Altitude indicators
and switches. Whl3n the opening screen for Main Menu 2 is displayed press the START key
to initiate pressure control. The display prompts the Operator to select the mode type and
displays the current mode, as shown in
Figure 7
.
B. The preferred measuring units and the value of the Set Point are selected as described in
paragraphs 5.C. to K.
C. Press the START key. The screen in
Figure 10
is displayed.
D. Press START a second time. The software starts to pressurise the system at a rate of 47
mbar/minute for Pitot or 56 mbar/minute for Static. If required, the START key can be used to
pressurise the PSLT at the higher rate of 114 mbar/minute for Pitot or 136 mbar/minute for
Static (paragraph 5.M.).
E. As soon as the pressurization starts, the VENTED flag extinguishes. During this time, the
display not only shows the Set Point value, but also the Actual value (
Figure 18
).