Curtiss-Wright D51600, Руководство по эксплуатации и калибровке, Страница: 18 / 39

PIM 417-O
PITOT-STATIC LEAK TESTER TYPE D51600
Issue 5
November 2009
Page 12
2. OPERATIONAL MODES
Five modes of operation are available. Three primary operational modes are available following normal
power up, while a fourth, subsidiary, mode is accessed during power up by pressing the PWR key with
the START key. The fifth mode, the Communications mode, utilises the front panel IR transceiver to
establish a serial communications link between the PSLT and a remote PC for use in downloading
software and for ATE. This mode is for Manufacturer's use only and no further information shall be
provided within this manual.
A. Leak Test Mode
The Leak Test Mode (Main Menu 1) is used for leak testing the aircraft pneumatic systems. Within this
mode, the Operator may select which channel is tested, Pitot or Static, in which units of measurement
the test is conducted, and is able to set individual values for the test parameters.
B. Pressure Control Mode
The Pressure Control Mode (Main Menu 2) is used for controlling pressure in order to test aircraft
airspeed and altitude instruments and switches. The Operator is provided with the same facilities as in
Leak Test Mode.
C. Setup Mode
The Setup Mode (Main Menu 3) provides the Operator with the ability to alter the default times for
Settling Period, Checking Period, and Power Down Period.
D. Maintenance Mode
The Maintenance Mode gives access to six Maintenance Menus. These menus are not part of normal
operating procedure, but are used to interrogate Built-In Test parameters during maintenance
operations. They are accessed during power up by pressing the START key at the same time as the
PWR key. Use of this mode is required during PSLT calibration.
3. OPERATIONAL OVERVIEW
Once the test conditions have been selected and the START key pressed, the PSLT automatically
carries out the required sequence without further Operator intervention, although the Operator may opt
for a faster rate of pressurization by keeping the START key held down until the selected Set Point has
been reached. As the Set Point approaches, the faster rate is abandoned and the PSLT controls to the
Set Point at the normal rate. The rate of pressure increase or decrease is automatically controlled to
within prescribed limits of accuracy. On reaching the Set Point, the PSLT initiates a volume settlement
period for a user defined time (default 2 minutes) and then measures the rate of leakage in the
selected units of measurement over a further check period (default 3 minutes), calculating and
displaying the resultant leakage rate on completion. If required, the SEL key may be used to skip from
one stage to the next. The test may be terminated at any time via the STOP key. Pressed once, it
gives access to the Pressure Monitor Mode. Pressed a second time it initiates a Vent Cycle to return
the equipment to normal atmospheric pressure.