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OVERVIEW

The Garmin AOA (Angle of Attack) System is designed to improve the pilot' s

awareness of the approximate available remaining lift of the aircraft' s wings. The

system calculates the approximate AOA (acute angle between the wing chord line and

the relative wind) using pitot, AOA, and static air pressure inputs.

When correctly calibrated, the system provides a visual approach AOA reference,

as well as increasing caution and warning annunciations as the AOA approaches the

wing' s maximum coefficient of lift (CLmax).

SYSTEM DESCRIPTION

The Garmin AOA System is comprised of three components; the GI 260 Indicator,

the GAP 26 Probe, and the GSU 25 Air Data Computer. The GAP 26 sends pitot and

AOA air pressure to the GSU 25. The GSU 25 measures the air pressure inputs from

the probe and from an independent static source. The GSU 25 then calculates the AOA

information and sends it to the GI 260. The GI 260 displays the AOA information to

the pilot via ten color-coded LED annunciators. When calibrated correctly (refer to

the AOA System Installation Manual for calibration instructions), the system indicates

AOA during critical phases of flight. The system also provides awareness of AOA

trends toward the target AOA for an approach, as well as visual alerting of critical

AOA. When connected to an audio panel or compatible audio system, the GI 260

issues aural alerts of increasing frequency when the system approaches the critical

angle of attack.

190-01773-00 Rev. A

GI 260

AOA Indicator

Pressure

GAP 26

Air Data Probe

Pressure

Pneumatic

AOA System Owner's Manual

GSU 25

Static

Air Data Sensor Unit

AOA

Pitot

RS-232

AOA System

AOA