3.15 Testing Aircraft Systems Or Uut; Go To Ground And Shut-Down - GE Druck ADTS 405 User Manual

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3.15 Testing Aircraft Systems or UUT

WARNING: OBSERVE THE APPROPRIATE SAFETY INSTRUCTIONS AND PROCEDURES
Connect the hoses and appropriate adaptors to the aircraft system or UUT.
To make sure that the connections to the aircraft system or UUT are not leaking carry
out a leak test detailed in the appropriate aircraft or component manual.
3.15.1

Go To Ground and Shut-down

On completion of testing and, before disconnecting from the aircraft system or UUT,
the pressures in the system must be taken to the local atmospheric pressure (ground)
with zero airspeed.
If the display shows "Leak Measure", press LEAK MEASURE/CONTROL.
Press GROUND, F1, [Go To Ground].
Wait for the display to show "Safe At Ground". It is now safe to
disconnect the aircraft system or UUT.
The pressure in the system changes towards ground. The ground pressure or "Ground"
replaces the static or altitude aim value.
If required, new rates of change can be entered while going to ground.
To change the ROC or static rate, press ROC/Ps Rate and enter the new value.
To change the airspeed or Qc rate, press SPEED/Qc then RATE and enter the new
value.
To change from going to ground, enter a new altitude (static) or airspeed (Qc) set-point.
When the airspeed reaches zero and the Ps channel pressure nears ground, the
system re-measures atmospheric pressure to update the recorded ground pressure
(QFE). During this period, the display shows the message "Checking Ground". The
ADTS 405 then reconnects to the aircraft system and equalises the system pressures.
Commands cannot be entered when these two messages are displayed.
The Ps channel pressure is then taken to the new recorded atmospheric pressure and,
at this new pressure, the display shows the message "Safe At Ground". The ground
vent and zero valves remain open to keep the aircraft system vented to atmosphere.
Press CLEAR/QUIT to continue with normal operation. The ground vent and zero
valves automatically close.
K114 Issue No. 9
DETAILED IN THE AIRCRAFT MAINTENANCE MANUALS OR COMPONENT
MAINTENANCE MANUALS.
Operation