Chapter 7. Reference
76 | ADTS 405 R/F Mk2 Instruction Manual-English © 2017 General Electric Company – All Rights Reserved.
4. A new rate aim can be entered using the numeric keys, if the unit is in Control Mode
(Aim displayed). Use LEAK MEASURE/CONTROL, to change between Control and
Measure mode.
5. If the automatic airspeed rate is selected (using SETUP, RATE) the airspeed rate is
automatically adjusted to simultaneously achieve both altitude and airspeed aim
values. This adjustment normally requires a reduction in the rate from the aim value;
the rate does not exceed the aim value. When airspeed (not Qc) is automatically
reduced, the display shows (A) after RATE CAS.
7.2.10 LEAK MEASURE/CONTROL
This key switches between MEASURE and CONTROL mode. The controllers are switched off
in Measure mode, so it can be used to measure leaks in the aircraft system.
Note: The pneumatic supply pumps must be switched on before going to CONTROL
mode.
1. In Measure mode, the display shows “LEAK MEASURE”.
2. Press LEAK MEASURE/CONTROL to switch the controllers on.
3. The display briefly shows “REGAINING CONTROL” while the pressure controllers
adjust to the system pressure. No significant pressure transients are produced when
regaining control.
4. In “CONTROL” mode, the display shows “Aim” value.
5. Two safety systems are built-in to protect the aircraft systems during leak testing.
These are Auto Leak recovery and Auto Limit recovery. Auto Leak recovery
automatically regains control if the leak rate exceeds the currently set limits on either
channel.
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 1 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.
7.2.11 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 Mk2 during the power-
up sequence.
3. When GROUND is pressed, a menu gives a choice of three ground functions.
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