Curtiss-Wright D51600, Руководство по эксплуатации и калибровке, Страница: 23 / 39

PIM 417-O
PITOT-STATIC LEAK TESTER TYPE D51600
Issue 5
November 2009
Page 17
NOTE: When the START key is pressed, the Set Point selected will be saved as
the default value for the next test and each measuring unit has its own
default value.
Figure 10 Pre-Pressurisation Screen
M. Press START. The software starts to pressurise the system at a rate of 47 mbar/minute for
Pitot or 56 mbar/minute for Static. However, it is possible to select a faster rate of
pressurization. The default method of selection is by pressing and holding the START key.
The PSLT then pressurises at the faster rate of 114 mbar/minute or 136 mbar/minute,
respectively, until the either the Set Point is reached or the START key is released,
whereupon the PSLT returns to pressurising at the normal rate. This may be changed,
however, by means of Maintenance Menu 6, Fast Rate Mode (refer to paragraph 8.
Maintenance Mode). If the Rate Toggle Mode is set via this menu then during pressurization
the START key is used to toggle between the normal and fast rates of pressurization using
discrete key presses rather than pressing and holding. i.e. !having pressed START to initiate
system pressurization, pressing START a second time selects the faster rate, while pressing it
a third time returns the system to the normal rate, and so on.
CAUTION: WHEN THE FAST RATE IS SELECTED AND THE PSLT IS OPERATING
IN THE STATIC MODE USING MILLIBARS, INCHES OF MERCURY OR
KNOTS, THE PUMP MAY GENERATE RATES IN EXCESS OF THE VSI
GAUGE MAXIMUM. IT IS RECOMMENDED, THEREFORE THAT FOR
HELICOPTERS ONLY THE NORMAL RATE IS USED . FOR FIXED WING
AIRCRAFT, ONLY THE NORMAL RATE SHOULD BE USED WHEN
COMMENCING TESTS AT AN ALTITUDE OF 13000 OR HIGHER
N. 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 11 ).
P. While the test sequence continues automatically, it is possible for the Operator to intervene if
required. Once system pressurization has commenced, the SEL key allows the Operator to
skip forward from any stage to the next. Following pressurization, the START key can be used
to return to the beginning and repeat the test. In addition, the +/- keys can be used to return to
the beginning of the 1test and alter the value of the Set Point.