Mini-X Installation, Setup & User Manual GRT Avionics
Revision A9 89
The indexer will show a green circle, with no chevrons, when the angle-of-attack is in the optimal range.
When the AOA data used to drive the EFIS screens is based on the “calculated” AOA data, “EST”
(estimated) will appear inside the indexer circle. Calculated AOA will be used if no measured AOA data
is available, or if the measured AOA function has not been calibrated.
WARNING: The use of this indication is purely at the judgment of the pilot. The accuracy of
this AOA indexer, and its stall warning, is affected by EFIS sensor errors and the accuracy of
the calibration procedure. The EFIS calculation of angle-of-attack, and the approach AOA
indexer should not be used as the only stall warning instrument.
The approach AOA indexer will not appear at low angles-of-attack.
AOA Too High – Need to Pitch Down
8.5.2 Barber-Pole Stall Speed Indicator
A vertical red/black bar is displayed on the bottom half of the airspeed tape. The top of this bar
corresponds to the stall speed at the current "G" loading, and is based on the stall speed entry made in
the EFIS, and the normal acceleration "G's" sensed by the AHRS.
