Alpha Systems AOA Eagle Manual

Alpha Systems AOA
6180 140th Ave. N.W.
Ramsey, MN 55303
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The information contained in this manual is for reference only. If any
information contained herein conicts with similar information contained in
the Airplane Flight Manual, the information in the Airplane Flight Manual shall
take precedence.
COPYRIGHT NOTICE
© 2016, Alpha Systems AOA. All rights reserved.

Eagle
PILOT’S GUIDE
P# AOA-9051-EAGLE

Revision History
Manual Eagle Pilot’s Guide
Rev A - March, 2016
Summary New release

Alpha Systems AOA Eagle Pilot’s Guide
Page TC - 1
Table of Contents
Table of Contents
1. INTRODUCTION 1-1
1.1 Background Information: 1-1
1.2 System Description: 1-1
1.3 Restrictions and Limitations: 1-2
2. EAGLE CONTROLS 2-1
2.1 Display Controls 2-1
2.2 Switch Panel Controls: 2-2
2.3 Eagle Display Segments: 2-3
2.5 Stall Set-point Calibration: 2-5
2.6 Flap Calibration Set-points: 2-5
2.7 Setting Calibrated Day / Night Brightness Levels: 2-6
2.8 Adjusting the Audio Volume Level: 2-7
2.10 Select Audio Type: 2-8
2.11 Brightness Adjustment When Active: 2-9
 2.12In-ightCalibrationFlowChart: 2-9
3. OPERATION 3-1
3.1 Practice High AOA Flight Regime: 3-2
Observed Indications: 3-3
As the recovery progresses: 3-4
3.2 Practice Takeoff and Climb Using AOA: 3-7
Establish Segments Illuminated 3-8
Fly Practice Takeoffs for Familiarization 3-9
3.3 Practice Best Glide Speed: 3-11
Establish Segments Illuminated 3-11
3.4 Practice Approaches Using AOA: 3-13
Establish Segments Illuminated 3-14
Fly Practice Approaches for Familiarization 3-15
Useful Techniques when using the Eagle Indicator 3-16
NOTES 3-18
4. APPENDIX 4-1
4.1 Acronyms and Abbreviations: 4-1
TERMS 4-1
DEFINITIONS 4-1

Alpha Systems AOA Eagle Pilot’s Guide
Table of Contents
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List of Tables
Table 2-1: Eagle Display Control Features 2-1
Table 2-2: Switch Panel Controls 2-2
Table 2-3: Segment Conditions 2-3
Table 3-1: Observed Indications Chart 3-17

Alpha Systems AOA Eagle Pilot’s Guide
Page 1 - 1
Introduction
1. INTRODUCTION
1.1 Background Information:
The Alpha Systems AOA system was primarily designed to improve
operational safety of airplanes by increasing pilot awareness of available
lift during operations at high angles of attack. Additional benets include
identifying aircraft performance based on a xed angle of attack or a constant
CL, such as maximum range and best glide - Stall.
AOA: Angle of Attack is the difference between the airfoils chord line (a line
from the leading edge to the trailing edge of the wing) and the relative wind
(the inverse of the aircraft ight path).
CL: Coefcient of Lift is a relative measure of an airfoil’s lifting capabilities.
CLmax: Coefcient of Lift Maximum is the angle of attack which if exceeded
will cause the airfoil to stall.
CD: Coefcient of Drag is a measure of total drag; induced and parasite
drag.
CL/CD: Coefcient of Lift over Coefcient of Drag is a ratio between lift and
drag.
CL/CD Maximum: is the maximum lift-to-drag ratio at which maximum range
and maximum glide distance will be found for propeller airplanes.
1.2 System Description:
The Alpha Systems AOA “Eagle,” measures pressure at two points from
an AOA probe mounted solidly to the wing in reference to the cord of the
wing that conveys changing differential pressures, via sense lines, to the IF
module. The IF module converts the pressures into an electronic signal that
is transmitted to the Eagle indicator.
The Eagle indicator interprets the signal and turns on the appropriate
segments to convey the AOA or lift information to the pilot. In addition to
the visual display, the IF module also has an I/O connector that allows
connection of the remote audio interface system that provides warning
annunciations in the pilot’s headset.

Alpha Systems AOA Eagle Pilot’s Guide
Introduction
Page 1 - 2
The Alpha Systems AOA system draws a minimal current of approximately ¼
Amp (250mA) of electrical power. For the system to operate correctly, it must
be supplied electrical power within a range of 12 to 28VDC, be calibrated
correctly and the openings on the AOA probe must be kept clear of any
obstructions - mounted securely in clean air ow.
Probe heat is an option and if installed requires approximately 8 Amps of
electrical power at 12 or 28VDC to operate. To extend the life of the probe’s
heating element, it is recommended that the probe heat not be used while on
the ground.
1.3 Restrictions and Limitations:
The Alpha Systems AOA cannot be placed in the cockpit in such a manner as
to interfere with the pilot’s view of primary ight instruments.
The Alpha Systems AOA cannot be placed in the cockpit in such a manner as
to obstruct the pilot’s view or cause distraction.
The Alpha Systems AOA is a stand-alone system and does not replace any
existing, primary instruments, or displays and is not considered essential for
ight.

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Eagle Controls
2. EAGLE CONTROLS
2.1 Display Controls
2 1
Use the table below for a description of the functionality of the controls in
Figure 2-1
Table 2-1: Eagle Display Control Features
ITEM CONTROL FUNCTION
1 Brightness Button This button is at the bottom right of
the Eagle display and when pressed
repeatedly, will step through 16 levels
of brightness. When the maximum
brightness level is reached, the brightness
returns to the minimum and steps up each
time the button is pressed again.
2 Auto Brightness
Photocell The photo cell is at the lower left of the AOA display automatically detects the
ambient light and will switch from “day
time” brightness preset to “night time”
brightness presets automatically. The
Brightness push button can override
either preset at any time.
Figure 2-1 DSTR-AOA-9600 (L2.0 Display)_Straight_Lights_On.png Controls

Alpha Systems AOA Eagle Pilot’s Guide
Eagle Controls
Page 2 - 2
2.2 Switch Panel Controls:
ITEM CONTROL FUNCTION
1Rotary Switch Is an 8 position rotary switch that has a
TRIANGLE SHAPED POINTER to indicate
the switch position, NOT THE SCREW
DRIVER SLOT. There are markings on the
case at 0, 2, 4, 6 but can be positioned
in-between to gain access to the odd
numbered modes when directed in the
calibration procedure.
2 CAL Button This button is the recessed blue button
and is marked “CAL”. This button is used
to enter various calibration values (OAA &
Cruise) during the calibration procedures.
3 SEL Button This button is used to enter the calibration
modes when the rotary switch is in the
corresponding mode set position.
4Audio Mute Switch This switch mutes the audio warning when
in the UP position.
5 Audio Mute LED This amber led illuminates when the audio
alarm has been deactivated by the audio
mute switch.
53
4
2
1
Figure 2-2 pos 0.png Controls
Table 2-2: Switch Panel Controls