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Chapter 6. REFERENCE AND SPECIFICATION
6.
Auto Leak recovery can be switched off using SETUP, LEAK MEASURE/CONTROL, [AUTO
LEAK].
7.
If negative airspeed or Qc occurs in measure mode, the zero valve automatically opens for
a period of one second to balance the airspeed or Qc. This only applies when the minimum
CAS (or Qc) limit is zero.
8.
Auto Limit recovery automatically regains control if the pressure on either channel leaks
outside of the selected limits, (except for negative airspeeds).
9.
Auto Limit recovery can be switched off using SETUP, LEAK MEASURE/CONTROL, [AUTO
LIMIT].
Note: Auto Limit and Auto Leak recovery functions require the pneumatic
supply pump to be switched on.
6.2.11 GROUND
1.
This key enables a display of ground pressure or automatically controls the pressures in the
aircraft system to local atmospheric pressure.
2.
The local atmospheric pressure is recorded by the ADTS 405 during the power-up
sequence.
3.
When GROUND is pressed, a menu gives a choice of three ground functions
Note: Both channels (Ps and Pt) must be set to Cntrl for go to ground.
6.2.12 [GO TO GROUND]
Note: The Go-to-Ground operates only in Control Mode.
1.
Selecting [GO TO GROUND] automatically enters an altitude or static aim equivalent to
local atmospheric pressure (QFE) and an airspeed or dynamic pressure aim of zero. The
system pressures will then be controlled towards these aims, in the normal way, at the
rates set by the ROC/Ps Rate and RATE keys. At any time when going-to-ground, a new
rate of change can be entered, the ADTS 405 continues going-to-ground.
2.
At any time during going-to-ground, a new value aim for ALT, CAS, TAS, Mach, Ps, Qc, Pt or
EPR can be entered. This causes the procedure to stop and normal controlling operation to
start.
3.
When the airspeed is zero and the Ps channel pressure is close to ground, the QFE is re-
measured to update the stored "ground" pressure value, the display shows the message
"CHECKING GROUND". The ADTS 405 then reconnects to the system under test and
equalizes the pressures.
4.
The display shows the message "Safe At Ground"; the ground and zero valves remain
open so that the aircraft system permanently vents to atmosphere. No commands can be
entered when these two messages are displayed.
5.
Press CLEAR/QUIT to continue with normal operation. The ground and zero valves then
automatically close.
6.2.13 [DISPLAY QFE]
1.
When [DISPLAY QFE] is selected, the local atmospheric pressure recorded during the
power-up sequence is displayed as QFE in the default units set in configuration.
Press CLEAR/QUIT to return to the normal user display.
2.
76 | ADTS 405 Mk2 Instruction Manual-English
© 2015 General Electric Company – All rights reserved.
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