PIM 417-O
PITOT-STATIC LEAK TESTER TYPE D51600
Issue 5
November 2009
Page 15
Figure 7 Selecting Operational Mode
B. Select the desired mode by using the SEL key to toggle between Pitot and Static. As the
selected mode is changed, the associated flag will change correspondingly. The presence of
the appropriate flag is a constant reminder during later stages of the test of which mode has
been selected. This reduces the risk of inadvertently applying incorrect pressures to the
system under test.
C. Once the mode has been selected, press START. The screen prompts the Operator to select
the preferred units of measurement for the test. The first time the PSLT operates the default
units are knots (
Figure 8
). Thereafter the default units are the last units selected in previous
tests. The SEL key is used to select different units. Press once to select inches of mercury
(inHg) and twice to select millibar (mbar). Pressing a third time returns the display to knots. If
the Static mode has been selected, a fourth option of feet is available, appearing after millibar.
Figure 8 Selecting Units of Measurement
CAUTION:
WHEN CARRYING OUT STATIC LEAK TESTS IN KNOTS, CARE MUST BE
TAKEN AS THE PSLT IS OPERATING IN THE NEGATTIVE PRESSURE
MODE I.E. EVACUATING PRESSURE FROM THE AIRCRAFT, WHICH MAY
LEAD TO DAMAGE TO SENSITIVE INSTRUMENTS IF INCORRECT
PRESSURES ARE APPLIED.
D. With the correct units displayed, press the START key. The first time of operation, the PSLT
will operate using its default parameter settings, unless otherwise changed by the Operator.
These default settings are as follows:
(1) Set Point:
130 knots (or 30 mbar or 0.8 inHg or 1000 feet, depending on the
units selected. Note that for Static Mode, values are negative.)
(2) Setting Period:
2 minutes