AFH 5-14

1. Calibration techniques 2. Probes or vanes not being heated 3. The type of indicator itself 4. Flap setting 5. Wing contamination Figure 5-9. A conceptual representation of an AOA indicator. It is important to become familiar with the equipment installed in a specific airplane. Installation of AOA indicators not required by type certification in GA airplanes has been streamlined by the FAA. The FAA established policy in February 2014 pertaining to non-required AOA systems and how they may be installed as a minor alteration, depending upon their installation requirements and operational utilization, and the procedures to follow for certification of these installations. For updated information on this, please reference the FAA website at www.faa.gov.