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Chapter 3. OPERATION
3.6.1.2 To Change from Going to Ground
To change, enter a new altitude (static) or new airspeed (Qc) set-point.
a.
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.
b.
Press CLEAR/QUIT to continue with normal operation. The ground vent and zero
valves automatically close.
3.6.2 SETUP and CONFIGuration options
The SETUP key provides access to secondary functions using a menu system, extends the keyboard
and allows many of the ADTS 405 functions to be customized. All changes made under SETUP are
temporary and will be lost when the system is switched off. The range of options allowed in set-up
is determined by the set-up mode.
Example
Press SETUP and the display shows:
SETUP
1.
Pressing a function key (F1 to F4) enters the set-up menu.
2.
When in set-up, pressing a key (ALT Ps in this example) enters a menu or setting that
applies to the parameter.
36 | ADTS 405 Mk2 Instruction Manual-English
F1 Units
F2 Limits
F3 Oscillation
F4 More
ALT
Ps
Figure 3-8: Set-up example
Enter Height of
Instrument Above
ADTS
> 0
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