Garmin AOA System User manual

AOA System
Owner’s Manual

© 2014 Garmin Ltd. or its subsidiaries. All rights reserved.
This manual reflects the operation of System Software version 2.10 for the GI 260,
or later. Some differences in operation may be observed when Comparing the
information in this manual to later software versions.
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September, 2014 190-01773-00 Rev. A Printed in the U.S.A.

LIMITED WARRANTY
All Garmin avionics products are warranted to be free from defects in materials
or workmanship for: two years from the date of purchase for new Remote-Mount
and Panel-Mount products; one year from the date of purchase for new portable
products and any purchased newly-overhauled products; six months for newly-
overhauled products exchanged through a Garmin Authorized Service Center; and
90 days for factory repaired or newly-overhauled products exchanged at Garmin
in lieu of repair. Within the applicable period, Garmin will, at its sole option, repair
or replace any Components that fail in normal use. Such repairs or replacement
will be made at no charge to the customer for parts or labor, provided that the
customer shall be responsible for any transportation cost. This warranty does not
apply to: (i) cosmetic damage, such as scratches, nicks and dents; (ii) consumable
parts, such as batteries, unless product damage has occurred due to a defect in
materials or workmanship; (iii) damage caused by accident, abuse, misuse, water,
flood, fire, or other acts of nature or external causes; (iv) damage caused by service
performed by anyone who is not an authorized service provider of Garmin; or
(v) damage to a product that has been modified or altered without the written
permission of Garmin. In addition, Garmin reserves the right to refuse warranty
claims against products or services that are obtained and/or used in contravention
of the laws of any country.
THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE
AND IN LIEU OF ALL OTHER WARRANTIES, WHETHER EXPRESS, IMPLIED OR
STATUTORY, INCLUDING ANY LIABILITY ARISING UNDER ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, STATUTORY OR
OTHERWISE. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, WHICH MAY
VARY FROM STATE TO STATE.

IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT
OR CONSEQUENTIAL DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE
OR INABILITY TO USE THE PRODUCT OR FROM DEFECTS IN THE PRODUCT. SOME
STATES DO NOT ALLOW THE EXCLUSION OF INCIDENTAL OR CONSEQUENTIAL
DAMAGES, SO THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU.
Garmin retains the exclusive right to repair or replace (with a new or newly-
overhauled replacement product) the product or software or offer a full refund of
the purchase price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND
EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY.
Online Auction Purchases: Products purchased through online auctions are
not eligible for warranty coverage. Online auction confirmations are not accepted
for warranty verification. To obtain warranty service, an original or copy of the
sales receipt from the original retailer is required. Garmin will not replace missing
Components from any package purchased through an online auction.
International Purchases: A separate warranty may be provided by international
distributors for devices purchased outside the United States depending on the
country. If applicable, this warranty is provided by the local in-country distributor
and this distributor provides local service for your device. Distributor warranties
are only valid in the area of intended distribution. Devices purchased in the United
States or Canada must be returned to the Garmin service center in the United
Kingdom, the United States, Canada, or Taiwan for service.
To obtain warranty service, contact your local Garmin Authorized Service Center.
For assistance in locating a Service Center near you, visit the Garmin web site at
http://www.garmin.com or contact Garmin Customer Service at 866-739-5687.

WARNING: For safety reasons, this AOA System’s operational
procedures must be learned on the ground.
CAUTION: This AOA System does not contain any user-serviceable
parts. Repairs should only be made by an authorized Garmin service
center. Unauthorized repairs or modifications could void both the
warranty and the pilot’s authority to operate this device under FAA
regulations.
NOTE: All visual depictions contained within this document, including
screen images of the GI 260 displays, are subject to change and may
not reflect the most current GI 260 software. Depictions of equipment
may differ slightly from the actual equipment.
NOTE: This product, its packaging, and its Components contain
chemicals known to the State of California to cause cancer, birth
defects, or reproductive harm. This notice is being provided in
accordance with California’s Proposition 65. If you have any questions
or would like additional information, please refer to our web site at
www.garmin.com/prop65.
NOTE: This AOA System is non-required and is to be used only as
supplemental information to the pilot. This AOA System is not to be
used or substituted for a certified stall warning system. No operational
credit may be taken for reduced approach speed and shorted landing
distances.
NOTE: The approved Pilot’s Operating Handbook (POH) or Airplane
Flight Manual (AFM) always supersedes this Owner’s Manual.
NOTE: Refer to the AOA System Installation Manual for calibration
instructions.
NOTE: This AOA system is designed to be accurate in the calibrated
aerodynamic configuration. When the aircraft experiences changes in
the airfoil shape (e.g., flap extension or icing accumulation), the AOA
indicator may no longer accurately represent the angle of attack.

Record of Revisions
Part Number Revision Date Description
190-01773-00 A 09/2014 Initial release

190-01773-00 Rev. A AOA System Owner’s Manual 1
AOA System
OVERVIEW
The Garmin AOA (Angle of Attack) System is designed to improve the pilot’s
awareness of the approximate available remaining lift of the aircraft’s wings. The
system calculates the approximate AOA (acute angle between the wing chord line and
the relative wind) using pitot, AOA, and static air pressure inputs.
When correctly calibrated, the system provides a visual approach AOA reference,
as well as increasing caution and warning annunciations as the AOA approaches the
wing’s maximum coefficient of lift (CLmax).
SYSTEM DESCRIPTION
The Garmin AOA System is comprised of three components; the GI 260 Indicator,
the GAP 26 Probe, and the GSU 25 Air Data Computer. The GAP 26 sends pitot and
AOA air pressure to the GSU 25. The GSU 25 measures the air pressure inputs from
the probe and from an independent static source. The GSU 25 then calculates the AOA
information and sends it to the GI 260. The GI 260 displays the AOA information to
the pilot via ten color-coded LED annunciators. When calibrated correctly (refer to
the AOA System Installation Manual for calibration instructions), the system indicates
AOA during critical phases of flight. The system also provides awareness of AOA
trends toward the target AOA for an approach, as well as visual alerting of critical
AOA. When connected to an audio panel or compatible audio system, the GI 260
issues aural alerts of increasing frequency when the system approaches the critical
angle of attack.
GI 260
AOA Indicator
Pneumatic RS-232
GSU 25
Air Data Sensor Unit
GAP 26
Air Data Probe AOA
Pressure
Pitot
Pressure
Static
Pressure
AOA
AOA System

190-01773-00 Rev. A
AOA System Owner’s Manual
2
AOA System
GI 260 CONTROLS
NOTE: The TEST and MUTE functions of the GI 260 are described in this
manual. Refer to the AOA System Installation Manual for information on
the CAL (calibration) and SET (alert volume) functions of the GI 260.
MUTE (SET)
Button
GI 260 Controls
TEST (CAL)
Button
SELF TEST
Press the TEST (CAL) button at any time to perform a self test of the GI 260. Upon
successful completion of the self test, all annunciators illuminate and a “Beep - Beep”
audible alert is played.

GI 260 Self Test (Pass)
All Annunciators
Illuminate Beep - Beep

190-01773-00 Rev. A AOA System Owner’s Manual 3
AOA System
A failure is indicated by alternating flashing red chevrons and a “Beep - Beep”
audible alert.

GI 260 Self Test (Fail)
Alternating
flashing red
chevrons Beep - Beep
MUTE
Start-Up
The system is muted by default upon start-up. The system remains muted until 15
seconds has elapsed since start-up and the Angle of Attack reaches the upper yellow
chevron. The first slow audible “Beep-Beep” alert is heard when the upper yellow
chevron annunciator illuminates.
Normal operatioN
Press the MUTE (SET) button to mute the GI 260 audible alert. When muted
manually during normal operation, the audio alert is muted for at least 15 seconds
and remains muted until the upper green bar illuminates for at least five seconds.

190-01773-00 Rev. A
AOA System Owner’s Manual
4
AOA System
NORMAL OPERATION
NOTE: Refer to the approved Pilot’s Operating Handbook (POH) or Airplane
Flight Manual (AFM) for recommended operational procedures.
POWER-UP
The AOA system is ON by default during power-up. During power-up, the
unit cycles its annunciators from bottom to top and back to the bottom. For
the unit to cycle its annunciators it must receive valid AOA data from the GSU
25, determine it has a valid calibration, and pass the unit self test.
GI 260 Power-Up
ARMING OF THE AOA SYSTEM
The AOA system arms automatically when the indicated airspeed exceeds 50
knots. Visual annunciations occur immediately upon arming (if applicable). Aural
annunciations are delayed for 15 seconds after the system is armed.