GE ADTS542F, User Manual

Page: 54 / 153

P
ITOT
S
TATIC
[EN] English 45 K0553 Revision D
- Ps (Ps1, Ps2 on ADTS553/554)
Displays the currently selected pressure. To change the pressure value:
1) Touch the “Aim” value (1) to highlight it, a numbered keypad is displayed.
2) Use the numbered keypad to input the new value.
3) If required, change the rate of change value by touching the “Rate Aim” value (2) and input
the new value, or use the nudge up/down controls (5/6) to increment/decrement the value
by a pre-defined factor.
4) Touch the “Tick” icon (3), the new value appears in the “Aim” field. The Ps value changes to
the new value, at the rate of change value, and provided that the new value is within
acceptable limits the Ps text will turn green
5) Touching the “Cross” icon (4), cancels the action and closes the keypad.
- Pt (Pt1, Pt2 on ADTS554)
Displays the currently selected pressure. To change the value, repeat the same procedure as
above for Ps.
- Qc (Qc1, Qc2 on ADTS554)
Displays the currently selected pressure. To change the value, repeat the same procedure as
above for Ps.
Altitude Dropback
The ADTS550 series products use a single set of pumps to generate the internal pressures and
vacuums which are ultimately presented at the Static and Pitot ports. During control situations
where high gas flows are required, it is possible for these source pressures to start to collapse.
This can manifest itself as an unwanted drop in altitude on a channel that was previously under
control and stable.
To prevent this effect, the software inside the ADTS will limit the CAS or Altitude rate changes to
maintain a non-ramping (stable) channel within the following limits.
NOTE
: In extreme cases the rate limiting effect can make altitude and CAS changes appear very
slow.