AeroVonics AV-20 Handbuch

D-0014-0, AV-20 Pilots Guide

4/2/2018 Page 1 of 29 Revision B

AV-20 / AV-20-S

Multi-Function Display

Part Number U-1001-0 / U-1002-0

Pilot’s Guide

(D-0014-0, AV-20, PILOTS GUIDE, REV B)

AeroVonics LLC

12306 Menaul Blvd NE.

Albuquerque, New Mexico 87122

D-0014-0, AV-20 Pilots Guide

4/2/2018 Page 2 of 29 Revision B

Document Revisions

Revision

Date

Description of Change

Author

PDF Sig

9/20/2017

Initial Release

JDB

4/2/2018

Updated for initial NORSEE certification, latest

UI for Software Release 1.0

JDB

Table of Contents

1. System Description.......................................................................................................................4

1.1. Angle of Attack ..................................................................................................................5

1.2. G Meter..............................................................................................................................5

1.3. Attitude ..............................................................................................................................5

1.4. Clock/Run Time.................................................................................................................6

1.5. Outside Air Temperature...................................................................................................6

1.6. Bus Voltage .......................................................................................................................6

1.7. Dual User Timers...............................................................................................................6

1.8. Engine Run Timer .............................................................................................................6

1.9. Flight Timer........................................................................................................................6

1.10. User Setup.........................................................................................................................7

1.11. Battery Operation ..............................................................................................................7

1.12. Model Functionality ...........................................................................................................8

2. Operating Limits............................................................................................................................9

3. Power-On Stabilization .................................................................................................................9

4. User Interface Overview .............................................................................................................10

4.1. User Interface Controls ...................................................................................................10

4.2. Page Navigation..............................................................................................................10

4.3. View Button .....................................................................................................................10

4.4. Left & Right Push ............................................................................................................11

4.5. Splash Screen .................................................................................................................11

4.6. Screen Brightness...........................................................................................................12

5. Main Pages.................................................................................................................................13

5.1. Clock Combo Page .........................................................................................................13

5.2. FE Time - Flight Time, Engine Time Page......................................................................14

5.3. User Timer Pages ...........................................................................................................15

5.3.1. Count-Up Mode...................................................................................................................15

5.3.2. Count-down Mode...............................................................................................................15

5.3.3. Mode Transition ..................................................................................................................17

5.4. AOA/G Meter Page .........................................................................................................18

5.4.1. Large AoA Display Mode ....................................................................................................18

5.4.1. Large G-Meter Display Mode..............................................................................................19

5.4.2. Dual Graph Mode................................................................................................................20

5.5. Attitude Page...................................................................................................................21

5.6. Setup Pages....................................................................................................................22

5.6.1. Setup – Top Level Menu.....................................................................................................22

5.6.2. Setup – System Info............................................................................................................23

5.6.3. Setup - Page Enable...........................................................................................................23

5.6.4. Setup – Audio Alerts ...........................................................................................................24

5.6.5. Setup – Audio Volume ........................................................................................................24

5.6.6. Setup – OAT Trim...............................................................................................................24

Digitally

signed by JDB

D-0014-0, AV-20 Pilots Guide

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5.6.7. Setup – Miscellaneous Options...........................................................................................25

5.6.8. Setup – AoA Limits .............................................................................................................26

5.6.9. Setup – G Limits .................................................................................................................26

5.6.10. Setup – Hard Calibration.....................................................................................................26

6. Audio and Visual Alerts...............................................................................................................28

6.1. Alert Prioritization ............................................................................................................28

6.2. Clearing Alerts.................................................................................................................29

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1. System Description

The AeroVonics AV-20 and AV-20-S Multi-Function Display provides a wide array of

supplemental flight information. The AV-20 provides 9 functions, while the AV-20-S model

provides 11 functions.

Features Include:

AoA Display (Voice Alerting & Peaks)

G-Meter Display (Voice Alerting & Peaks)

Attitude (Roll / Pitch)

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)

Internal Battery Operation

The unit incorporates a full color sunlight readable display, bezel-mounted light sensor for

automatic display brightness, and an internal battery for operation in the event of power

loss. The AV-20-S connects to the pitot and static systems of the aircraft, while the AV-20

model does not.

Figure 1 - AV-20 and AV-20-S

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Intended functionality is as follows:

1.1. Angle of Attack

Angle of Attack is derived from pitot and static pressure measurements combined with

internal inertial reference measurements. No dedicated external probes or other aircraft

modifications are required for AoA functionality.

AoA is computed based on the difference between aircraft pitch angle, and the aircrafts

path angle through the air, and current G loading.

An upper “near-stall” calibration point is set by the pilot and represents the desired

alerting / maximum scale point. A lower calibration point represents the nominal

“cruise” AoA and is used to set the lower boundary of the AoA scale. The amount of

pre-warning for an AoA alert prior to the certified aircraft stall point is based on pilot

preference.

Both visual and aural alerting is provided when the AoA is approaching or exceeds the

upper calibration point. AoA and associated alerting is only available on the AV-20-S

model. AoA information is not for primary aircraft control and is provided for

supplemental situational awareness only.

1.2. G Meter

G Load is determined via the internal inertial sensors and will measure up to 8G in

either direction. Independent positive and negative G limits are configurable, with both

visual and aural alerting being provided. Peak negative and positive G Loads are also

measured for display.

The range of the color-coded G scale is automatically scaled based on the pilot

configured limits such that the maximum indication (positive or negative) represents the

maximum value configured. G-Meter and associated alerting is available only on the

AV-20-S model. G Load information is not for primary aircraft control and is provided

for supplemental situational awareness only.

1.3. Attitude

Attitude (Roll & Pitch) is determined from the internal inertial sensors. AoA can be

overlaid on the attitude indicator page. A pitch-zero feature allows the current pitch

angle to be trimmed to zero, allowing synchronization with other on-board

instrumentation.

Attitude accuracy is better than 1° under stable conditions and better than 2.5° under

dynamic flight conditions. Airspeed is utilized to help stabilize pitch during takeoff,

landing and extended accelerations. Attitude is only available on the AV-20-S model.

Attitude information is not for primary aircraft control and is provided for supplemental

situational awareness only.

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1.4. Clock/Run Time

Clock functions include display of time in local and GMT time zones and can be set by

the pilot. A local offset value determines the difference between the GMT and local

time zone. The clock is internally backed up via an internal battery which automatically

recharges during flight. The clock function is available in both the AV-20 and the AV-20-

S models.

1.5. Outside Air Temperature

OAT is measured by an external temperature probe and is displayable in either Celsius

or Fahrenheit. OAT is available in both the AV-20 and the AV-20-S models.

OAT data is also utilized in the computation of TAS and Density Altitude and must be

connected for those data parameters to be displayed, however, as these parameters

also require pressure measurements, they are only available on the AV-20-S model. A

compatible OAT probe must be installed for OAT related features to be enabled.

1.6. Bus Voltage

Bus voltage is measured directly from the powered supply lines and displayed on the

clock combo page. Bus voltage is available in both the AV-20 and the AV-20-S models.

1.7. Dual User Timers

Dual independent timers are available for general purpose usage. Each timer can be

configured as a count-up or count-down timer, with both a visual and aural alert when

the count-down goes to zero. Resolution of the timers is 1 second. User timers are

available in both the AV-20 and the AV-20-S models.

1.8. Engine Run Timer

The engine run timer initiates counting based on bus voltage increasing above the no-

load battery voltage (alternator running), and special switching logic accommodates

both 12V and 24V aircraft. The timer can be reset by the pilot.

The engine run timer is not maintained between power-cycles, and does not represent

a HOBBS type function. The engine run timer is available in both the AV-20 and the AV-

20-S models.

1.9. Flight Timer

The flight timer initiates counting based on airspeed above 40 kts and can be reset by

the pilot. The timer will stop counting when the speed is below the threshold.

The flight timer is not maintained between power-cycles. The flight timer is only

available on the AV-20-S model, as airspeed switching is not available on the AV-20.

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1.10. User Setup

The pilot accessible setup menu can be used to easily configure an array of instrument

parameters. All parameters are configurable by the pilot, with certain functions being

inhibited during flight.

Options include display color choice, page enable/disable, audio alerts enable/disable,

audio volume, OAT trim, temperature units, time units, airspeed units, alert popup

behavior, AoA thresholds and G alert limits.

1.11. Battery Operation

The unit incorporates a small Li-Po battery that can operate the unit for approximately

30 minutes under normal ambient temperatures. If external power is lost and airspeed

is above 40 kts, the unit will automatically transition to internal power with no pilot action

required. When airspeed drops below 40 kts, a normal shutdown will occur. This

feature is only available on the AV-20-S model.

This battery is also utilized to maintain the clock time. Therefore, if battery operation

continues to the point of battery depletion, the clock may need to be reset on the next

power-up.

Note that the AV-20 also incorporates the identical battery but is not utilized for

operation when external power is lost, only for clock keep-alive functionality.

The battery is automatically recharged during normal operation.

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1.12. Model Functionality

The AV-20 is available in two configurations:

The AV-20 model, which does not include internal inertial sensors or pitot-static

sensors. Functions are limited to those indicated below.

The AV-20-S model, which includes the AV-20 base model functions, plus the

features gained from the full sensor set. Full functionality is available in this

configuration.

Feature / Model

AV-20

AV-20-S

Clock



OAT



Bus Voltage



Dual User Timers



Engine Run Timer



Flight Timer





AoA





Attitude





Density Alt





True Airspeed





G-Meter





Battery Operation





Audio Alerts

Timer Alert



AoA Alert





G Limit Alert





Table 1 - Functional Dependencies

The unit model and associated part number is shown on the splash screen

on power-up.

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2. Operating Limits

The AV-20 and AV-20-S are supplemental systems and may not be

used as a substitute for any system on a certified aircraft. No

operational credit may be taken for installation of this equipment.

The following operational limitations are applicable:

Operating Limits

Angle of Attack Range

0° to +30°

Angle of Attack Resolution

1°

Angle of Attack Operation

+35 to +300 Knots

Angle of Attack Accuracy

2.5°

Density Alt Range (Accuracy)

-1,000 to +25,000 Feet (± 500ft)

TAS Range (Accuracy)

+35 to +300 Knots (± 20 kts)

Attitude Angle

No Limits

Attitude Rate Limit

±250 Degrees / Second

Attitude Accuracy

1° Static, 2.5° Dynamic

G Alert Limits

± 8 g

OAT Range

-40°C to + 70°C

OAT Accuracy

±4°C

Bus Voltage Range

7 to 35 Volts

Bus Voltage Accuracy

±1.0 Volt

Clock Accuracy

± 1 Second/Day

Timer Accuracy

± 1 Second/Hour

Table 2 - Operating Limits

Refer to the AV-20 Installation Manual for Instructions for Continued

Maintenance & Operation.

3. Power-On Stabilization

The AV-20-S model incorporates precision air data and inertial sensors that are

temperature-sensitive. These sensors are thermally stabilized by an internal heater.

During power-on, the heater warms the sensors to the operating temperature; thus, they

require a few moments to stabilize.

During this power-on stabilization period, AoA, Attitude and Air Data-related parameters are

not available. These values will be flagged on each page, as described in the User

Interface section of this document.

Typical stabilization time is between 30 seconds and 1 minute, depending on the ambient

starting temperature of the unit. If the unit takes longer than 60 seconds to perform the

power-on stabilization, a hard calibration should be performed (See section 5.6.10).

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4. User Interface Overview

4.1. User Interface Controls

Controls for the AV-20 consist of three bezel-mounted momentary-push buttons. The

functionality of the buttons changes based on the current mode. User interface

components are as follows:

Photo Cell

View Button

(Changes View

Mode, or other

related action)

Left Control

Button

Right Control

Button

(Hold for manual

brightness adjust)

BOTH - Less Often Used Functions

(Push Left and Right Buttons Together)

Page

Navigation

Area

BOTH

Function

Indication

SET

4.2. Page Navigation

The Left and Right Control Buttons navigate through the different pages. The position

of the displayed page is shown graphically at the bottom of the page as a set of bars on

the left and right sides. The following graphic indicates that there are two pages to the

“left” and five pages to the “right”.

4.3. View Button

The VIEW button selects different viewing options for the current page, or performs

another function relative to the page selected.

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