Avcraft Engineering | KLR 10
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KLR 10


The easiest stall to recover is the one that never happens.



  • Inadvertent stalls are implicated in almost half of the GA approach and descent accidents
  • 60% of all stalls happen during takeoff and landing
  • Lift reserve is the actual safety margin above a stall
  • A plane’s lift is unique to its Angle of Attack
  • An airplane stalls when it goes above the critical Angle of Attack

Did you know that an aircraft will stall at the same Angle of Attack (AOA), whereas indicated airspeed will vary? Having an onboard sensor that measures AOA increases safety, particularly in high-AOA, low-speed flight regimes such as landing or maximum performance climbs. The KLR 10 is designed to provide you with clear indication to the wing’s available lift reserve. It alerts you with visual and audible cues well in advance of traditional stall warning systems. So you takeoff safely. You land safely. And you enjoy your flight.

  • An aircraft will stall at the same AOA, whereas indicated airspeed will vary
  • By changing the AOA, you can control lift, airspeed and drag
  • AOA is now used to provide an accurate account of the wing’s available “lift reserve”
  • The KLR 10 increases safety, especially during high AOA, low-speed flight regimes such as landing maximum performance climbs


  • Lightweight, Low-cost, easy installation with low power consumption
  • Accurate and instantaneous displays of lift reserve, which is the safety margin above a stall
  • Visual and audible cues alert you of decaying lift much earlier than traditional warning systems
  • Allows for quick and timely reactions
  • Independent of pilot-static systems, so it can be used even if the existing air-data system is compromised by ice, water or other contaminants
  • Optional heated probe
KLR 10

Operational and Environmental Specifications

Characteristic Specification
Operating Airspeed Range Minimum 25 knots TAS
Maximum 500 knots TAS
Operating Altitude Range Minimum 0 Ft MSL
Maximum 30,000 Ft MSL
Operating Humidity Maximum 96% Relative Humidity
Operating Temperature Range Minimum -20°C (-4°F)
Maximum 66°C (151°F)
Storage Temperature Range Minimum -30°C (-22°F)
Maximum 85°C (185°F)
Voltage Operating Range Minimum 12 Volts
Maximum 28 Volts
Electrical Load IF Module:
<200 mA at 14 VDC
<100 mA at 28 VDC
Heated Probe
<8 AMP at both 12 VDC or 28 VDC
Angular Operation -5 to +25 degrees angle of attack
Precipitation The KLR 10 probe functions properly when flown through non-icing precipitation
De-icing Fluid No de-icing fluid restrictions on probe
Sideslip Operation +/- 15 deg
Note: At sideslip angles of greater than 15 degrees, the accuracy may be diminished. However, the error will cause the warning indications to provide a greater margin of safety prior to wing stall.
Calibration Accuracy A properly calibrated system will result in an accuracy of +/-3% over the full scale of the calibration.


Pilot Video Tip by Sporty’s: Understanding Angle of Attack:
(Click here to read the full article at Sportys.com)

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