July 29, 2013 - Many military aircraft have them. They're often used in certification testing. And now, they are available from name brand aviation manufacturers, including Bendix/King.
"They" are angle of attack (AOA) indicators, a cockpit instrument displaying the relative wind's angle as it encounters a wing. Importantly, AOA is not the same as pitch angle.
Long recognized as the most accurate way to establish and maintain desired airplane performance - especially in low-speed situations as when landing, taking off, or maneuvering - AOA indicators give pilots a much more accurate presentation of how close a wing may be to its critical AOA. Exceeding the critical AOA usually leads to a stall if recovery isn't initiated.
This week at EAA AirVenture Oshkosh 2013, Advanced Flight Systems Inc. is introducing its AOA Pro III, a new probe-based system derived from the company's existing AOA system, which has seen more than 2,000 installations.
The new AOA Pro III system uses what the company calls a super-bright custom LCD with 26 colored segments, giving the pilot superior resolution. The AFS AOA Pro III uses separate calibration data for flight with flaps up and down, for a more accurate solution, according to the company.
The system includes a machined aluminum AOA display, AOA CPU module, push buttons, flap switch, wiring harness, AOA probe, 25 feet of tubing, and a detailed instruction manual. An optional glare shield mounting bracket and heated probe are available. The AOA Pro III is available for certified airplanes.
To learn more about the AOA Pro III, visit the company's booth, 4139, in Exhibit Hangar D.
The other news in AOA indicators is Bendix/King's entry into the market with the KLR 10 Lift Reserve Indicator. According to the company, the new offering provides at-a-glance awareness and audible cues of remaining lift "in an easy-to-install, easy-to-read device."
Other features include light weight, low power consumption, and easy installation. Visual and audible cues provide an alert of decaying lift much earlier than traditional warning systems, helping ensure quick and timely correction. The KLR 10 is independent of pitot-static systems, so it can be used even if the existing air data system is compromised by ice, water, or other contaminants. The KLR 10 is being marketed for experimental aircraft. An optional heated probe is available.
To learn more about the KLR 10, visit Bendix/King's booths, 289-292, in the Main Aircraft Display, and Booth 2162 in Exhibit Hangar B.