Aoa (Angle Of Attack) Calibration (Performed In-Flight); Angle Of Attack (Aoa) Display; Angle Of Attack (Aoa) Illustration - Garmin G3X Installation Manual

19.4 AOA (Angle of Attack) Calibration (Performed In-flight)

Installations that include a GAP 26 and which have Angle of Attack (AOA) enabled require that an AOA
calibration be performed to enable AOA functionality. The AOA calibration is used to determine the four
AOA settings shown in Figure 19-3. This calibration must be done while in flight. The AOA Setup page
(Figure 19-5) on PFD 1 is used for the AOA cal procedure, and is accessed in normal mode (requires that
an AOA input is enabled on the LRU Configuration page, see
WARNING
AOA calibration involves flying the aircraft at low airspeeds and angles of attack at or near
the stall point. Do not perform AOA calibration until the aircraft's stall recovery
characteristics are well-understood. Before AOA calibration, ensure that the aircraft is
clear of all traffic and at a safe altitude for stall recovery.
AOA is the angle between the aircraft's wing and the oncoming airflow (see Figure 19-4). As AOA
increases, eventually it will reach a critical value (determined by the physical characteristics of the wing),
whereupon the airflow will separate, the wing will stop producing lift, and the aircraft will stall. The
primary purpose of an AOA system is to monitor the wing's angle of attack and provide feedback to the
pilot when the aircraft is approaching the critical AOA.
G3X Installation Manual - Post Installation Checkout and Calibration Procedures 190-01115-01
Page 19-26
Stall Warning
AOA
Approach
Target AOA
Figure 19-3 Angle of Attack (AOA) Display
LOW ANGLE OF ATTACK
MEDIUM ANGLE OF ATTACK
EXCESSIVE ANGLE OF ATTACK
Figure 19-4 Angle of Attack (AOA) Illustration
Section 17.3.2).
Caution Alert
AOA
Minimum
Visible AOA
Air Flow is Broken.
No Lift to Sustain
the Airplane.
Rev. L