Sandia Aerospace STX 165 Installation Manual - Manual (Page 19)

3.8 Calibration Procedures - STX 165 Panel Mount Unit
NOTE: The Primary Flight Altimeter must be calibrated per
Part 43 Section E. Verify compliance with AC-43.13 as appli-
cable.
1. Connect the pitot-static test set to the aircraft static system. The STX 165 must be connected to
the aircraft static line.
2. Apply power to the STX 165 and allow the internal encoder to stabilize.
3. While in the SBY (Stand-by) Mode, Press and hold the IDT pushbutton while rotating the
Select Knob counterclockwise for three seconds (Note that the select knob will go a hard stop
when rotated approximately an eighth of a turn). When the USER SET UP screen is displayed,
Press the Enter pushbutton.
4. Rotate the Data knob clockwise to the DEFAULT VFR page.
5. Press and hold the IDT push-button for three seconds while rotating the Select knob Clockwise.
This will put you in the Installation set up mode and display the PALT TRIM page. (Note that
the select knob will go a hard stop when rotated approximately an eighth of a turn).
6. Set the Primary Flight Altimeter to 29.92 inches of mercury.
7. Apply vacuum from the pitot-static test set to obtain an altimeter reading of 35,000 feet (or
maximum test altitude specifi ed in Part 43, Appendix E).
8. On the STX 165, Press the ENTER pushbutton. The H (High) Trim value will be blinking.
Adjust the Data knob until the PALT display in the lower right hand corner of the display
shows 35,000 feet +/- 30 feet and press the Enter pushbutton.
(Note that the altitude display is an unfi ltered one foot increment display, and may show minor
fl uctuations.)
9. Apply pressure to the static system until the Primary Flight Altimeter reads -1000 feet.
10. Rotate the Select knob to place the brackets over the L Trim Value and press the Enter pushbut-
ton.
11. Rotate the Data knob until the PALT display in the lower right hand of the display shows -1000
feet +/- 30 feet, and press the Enter pushbutton.
3.9 Installation Confi guration - STX 165 Panel Mount Unit Only
1. Apply power to the STX 165.
2. While in the SBY (Stand-by) Mode, Press and hold the IDT pushbutton while rotating the Select
Knob counterclockwise. When the USER SET UP screen is displayed, Press the Enter pushbutton.
3. Rotate the Data knob clockwise to the DEFAULT VFR page.
4. Press and hold the IDT push-button while rotating the Select knob Clockwise for three seconds.
This will put you in the Installation set up mode and display the PALT TRIM page.
3.9.1 OAT Sensor
1. After entering the Installation confi guration page, rotate the Data knob one click clockwise. The
OAT sensor page is displayed.
2. The default setting is Installed, meaning the STP 78 is installed with the STX 165.
3. If the STP 78 OAT probe is not installed as part of the system, rotate the Select knob counter-
clockwise to select disabled.
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