AV-20S2019-10-09T15:19:42-06:00

AV-20S Multi-Function Display

Complement Your Panel with a Certified 12-In-One Display

Transform your panel without sacrificing simplicity. AV-20S is FAA APPROVED.

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AV-20S

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AV-20S

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Fits in Your Panel

Cutting-Edge Technology Without the Cutting

AV-20S fits in your existing 2” panel slot seamlessly. By mounting from behind, eliminating the need for cutting or replacing your panel.

12-In-1 Functionality

Customizable Display

  • AoA Display (Voice Alerting & Peaks)
  • G-Meter Display (Voice Alerting & Peaks)
  • Attitude (Roll / Pitch)
  • Slip / Skid Indication (NEW!)
  • Clock (GMT / Local)
  • Outside Air Temperature (C / F)
  • Bus Voltage Display
  • Dual User Timers (Count Up / Down)
  • Engine Run Timer
  • Flight Timer
  • Density Altitude Display
  • True Airspeed Display (Kts / Mph)
  • Audio Alerts (AoA, G, Roll Limits)

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Sunlight Readable Display

Goodbye Glare

With a matte display, AV-20S is visible in direct sunlight and automatically adjusts brightness to ambient light.

Audio Alerts

Eyes On the Sky

Fly focused and aware with customizable audio alerts. AV-20S’ many display configurations offer several audio triggers to alert you of critical flight information.

Probeless Angle of Attack

Avoid Stalls

The AV-20S alerts you visually and aurally if you approach a dangerous AoA. AoA is calculated by comparing the aircraft’s pitch, flight path, and G-loading.

Specification Value
Input Voltage Nominal +10 to +32 VDC
Input Voltage Max +60 VDC
Input Power Nominal 3 Watts (0.25Amps @ 12VDC)
Input Power Max 6 Watts (0.50 Amps @ 12VDC)
Required Circuit Breaker 1 Amp
Operation on Battery 30 Minutes (Standard 15°C Env)
Physical Attributes
Mounting Configuration 2 ¼” Round Instrument Hole
Dimensions wo/Connector 2.4 x 2.4 x 1.2 Inches
Weight 0.25 Lbs.
Electrical Connector 9 Pin Male D-Sub
Pneumatic Connectors ¼” OD Quick Connect
Mounting (4X) #6-32 Machine Screws
Case Material High Impact ABS Plastic
Environmental
Operating Temp -20°C to +55°C
Storage Temp (48 Hrs) -30°C to +80°C (Via Analysis)
Humidity (48 Hrs) 90% RH (Via Analysis)
Display
Diagonal Size 1.8”
Contrast Ratio (Typical) 500
Brightness (Typical) 1000 cd/m2
Viewing Angle Left/Right 60°
Viewing Angle Up 45°
Viewing Angle Down 10°
Backlight Lifetime (Typical) 50,000 Hrs

What’s “In the Box”2019-10-08T15:09:13-06:00

Included is the AV-20 (with internal backup battery), two 1/4″ quick connect fittings, mounting screws, and wire harness.  The harness has all interconnect pins pre-loaded with individually labeled wires.

OAT probe is NOT included and must be purchased separately.  The AV-20 is compatible with the industry standard Davtron Analog probe, available through common component suppliers.  (If the OAT probe is not connected, OAT, DALT and TAS will not be displayed.)

Does the Probeless AoA behave exactly like the probed system?2019-10-08T15:09:31-06:00

Yes and no. During the majority of flight conditions, they are equivalent. However, during conditions where the aircraft is moving through a mass of air that has a vertical component, the behavior is slightly different.

As vertical updrafts are rarely of concern, the scenario to look at is the downdraft during final approach. In this environment, the aircraft will sink at a rate that is not consistent with the aircraft pitch. As the algorithm utilized compares the aircraft pitch to the actual flight path through the air, this will result in an artificial positive AoA (see diagram).

A downdraft that forces a sink rate of -1000 FPM will effectively increase the current AoA by approximately 5.6 degrees (this is speed dependent).

In effect, this makes the AoA thresholds more sensitive and an alert will be generated earlier than normal – but that’s a good thing in this scenario.

If a down-draft of this magnitude is experienced, the pilot action is to add power; Similarly, if AoA exceeds the configured limit, the pilot action is also to add power. As the pilot actions are identical for both scenarios, it can be argued that the source of unexpected altitude loss (downdraft or a wing losing lift) is irrelevant. Add power.

Interestingly, if taken to the extreme, the probeless AoA system actually starts to behave like a wind-shear alerter and any downdraft that is sufficient to cause excessive pitch vs flight path angle will generate an alert – it’s effectively a sink rate alert at that point.

In a probed system, as the probe is only measuring ambient air angle and loss of altitude is not measured, this arguably advantageous behavior is not available.

How is “Probeless” Angle Of Attack Determined?2019-10-08T15:09:37-06:00

Angle of attack is determined by comparing aircraft pitch to the actual flight path angle through the air. This is equivalent to the angle at which the wing is intercepting the body of air surrounding the aircraft – exactly the same as a probe based AoA system. Pitch is determined by a precision internal AHRS, and flight path angle is determined by a precision ADC (airspeed and vertical speed). The resulting angle is then augmented with G-Load, as determined by internal acceleration sensors.

For example, during a climb, if the pitch angle is 10 degrees up, and  the aircrafts flight path through the air (forward airspeed and vertical speed) is also 10 degrees up, the equivalent AoA is 0 Degrees. However, if the flight path angle through the air is only 7 degrees, then the equivalent AoA is positive 3 degrees as the wing is no longer able to maintain full lift.

Therefore, no dedicated AoA probe is required – only internal inertial and pressure sensors (8 in total).  Connection to the aircraft’s pitot static system is required.

Reference Sperry Patent #3,948,096 for additional implementation details.

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