Version 16.10 AF-6600 AF-5000 Series Install Manual 257
APPENDIX P: Performing Pitot/Static Checks
Background
Dynon Avionics SV-ADAHRS-200/201 use airspeed in the calculation of attitude (or GPS ground speed when
airspeed is unavailable). The internal rate sensors are monitored and calibrated in flight using feedback
from the accelerometers and from airspeed to achieve a highly accurate attitude solution.
When a pitot or static test is performed the sensors in the SV-ADAHRS-200/201 are being exposed to
dynamics that are impossible to achieve in a real aircraft flight environment, namely, large airspeed
changes without the accompanying accelerations and rotations. This false condition will cause a well-
calibrated unit to incorrectly adjust its calibration. Furthermore, when a unit is in a test situation a change
in applied pitot or static pressure will cause the attitude to pitch up or down. This is expected.
The AF-5000 EFIS contains a special mode that allows you to perform required altimeter and/or airspeed
checks without affecting the calibration of the attitude-sensing components.
Pitot/Static Test Instructions
This test must be used when performing pitot/static, transponder, or other tests that manipulate either the
pitot or static pressures. You
Before conducting any pitot/static testing, follow these guidelines:
1. The aircraft itself should be temperature stable. For example, if the aircraft is moved from outside in
the sun to a hangar for testing, tests should not be started until the airplane has stabilized at the
hangar temperature.
2. Transponders and ADS-B OUT systems operating under test conditions transmit specific information
about the aircraft, including position and altitude data. These tests frequently involve a check of the
aircraft’s altimetry system in which air pressure is induced into the pitot static system to simulate
operation at various altitudes. In cases where transmission lines are not attached directly to test
equipment, antenna shielding must be used to prevent propagation of test signals with potential to
interfere with ATC operations or TCAS-equipped aircraft operating in the area.
3. Turn AF-5000 on and let it warm up until the altitude reading is stabilized. This period should be at least
5 minutes, but may take longer depending on environmental conditions.
Connect your Pitot/Static Test Set to the aircrafts Pitot and Static ports. You will need to cover the two
Dynon Pitot Tube drain holes on the bottom of the Pitot Tube.
4. To enter the Altitude Test mode select: SET > CAL > 12. Altitude Menu on the EFIS. Both the active and
standby ADAHRS (if equipped) are shown to allow a single test to calibrated multiple ADAHRS. The
altitude values shown in this mode are the same as you would encounter while in-flight with a Baro
setting of 29.92 . They are not adjusted or otherwise altered from their normal readings and behaviors.
5. Set Airspeed to stable constant airspeed on your Pitot/Static Test Unit, we usually use 65 knots.
6. Set Altitude Climb rate to a value of +/- 2000 fpm on your Pitot/Static Test Unit.
7. Perform a standard leak check on the Pitot/Static system before testing the required altitudes.
8. Set each required Altitude on your Pitot/Static Test unit and verify the altitude is within acceptable
limits on each ADAHRS.
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