Sandel sn3500 ehsi Manual

82005-PG, REV M3 SANDEL SN3500 PILOTS GUIDE ERRATA Page 1 of 2
SN3500 EHSI
Pilot’s Guide Effectivity and Errata
Insert this update ahead of the cover page of the Pilot’s Guide referenced
below.
Date:
Effectivity:
Errata:
03-JUL-2014
SN3500 Software Version 4.05 and A4.07
Pilots Guide 82005-PG-M
With the exception of the superseding
information contained in this document,
operation of the SN3500 is as described in
the SN3500 Pilot’s Guide referenced
above.
`
There are no errata for this update.
82005-PG, REV M3 SANDEL SN3500 PILOTS GUIDE ERRATA Page 2 of 2
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SN3500
Primary Navigation Display
with
Reversionary Attitude Mode
And
LNAV Roll Steering
Pilot’s Guide
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE II
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82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE iii
PILOT INFORMATION
Publication Date: 2 MAR 2012
This guide provides information on the use and operation of the
SN3500 Primary Navigation Display.
Images found in the main portion of this guide apply to the
SN3500 equipped with an LED light source. Images
corresponding to SN3500’s without the LED light source can be
found in the appendix at the end of this guide. Refer to chapter 1
for instructions to identify which light source is present in your
SN3500.
Information in this manual is current as of publication or revision
date. Specifications and operational details are subject to
change without notice at the discretion of Sandel Avionics, Inc.
COPYRIGHT
Copyright 2012 Sandel Avionics, Inc.
May be covered by one or more US and foreign patents,
including: US Patent Nos. 6,259,378, 6,670,892, 6,507,288,
6,750,788, 6,972,695, and 7,187,304. Australia Patent No.
750,651. China Patent No. 1211639C. Israel Patent Nos. 135,
174, 153, 400, and 155-983.
All rights reserved. No part of this manual may be reproduced,
stored or distributed without written permission of Sandel
Avionics, Inc. Additional copies of this manual are available
from:
Sandel Avionics, Inc.
2401 Dogwood Way
Vista, CA 92081
USA
Tel: [phone]
Fax: [phone]
www.sandel.com
REVISION NOTICE
The “Effectivity, Errata, and Revision History” allow the use of
this Pilot Guide with a specific software release. The
“Effectivity, Errata, and Revision History” specifically lists the
software to which this Pilot’s Guide applies and corrects any
errors or omissions in this revision of the Pilot’s Guide.
Document number 82005-PG-ERR, Effectivity, Errata, and
Revision History” can be found on page xiii of this Pilot’s Guide.
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE iv
OPERATIONAL AND LEGAL ISSUES
The information displayed on the SN3500 is generated by
external equipment. It is the pilot’s responsibility to ensure the
correct configuration and use of the external equipment. The
SN3500 is subject to all legal and operational limitations of the
equipment supplying data to it. Always refer to your approved
Aircraft Flight Manual Supplement for operation and limitations
on the use of installed equipment.
Note: Because aircraft vary in their installed equipment, it is
important to note that what is displayed on the SN3500 may vary
depending on the presence or absence of equipment.
Please keep in mind that it is required by Federal Aviation
Regulations to have on board current charts appropriate to the
flight. The moving map on the SN3500 does not fulfill this
requirement. A current internal database is not required but is
recommended. The internal database supplies supplemental
data only (such as nearest airports, navaids and airspace).
Flight plan waypoints and IFR approaches are supplied to the
SN3500 by the associated IFR approved GPS receiver.
Supplemental data is intended for positional awareness only and
should not be used for primary navigation.

82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE v
APPROVALS
The FAA has approved the SN3500 under the following TSOs:
C3d: Turn and Slip Instrument
C4c: Bank and Pitch Instruments
C6d: Direction Instrument, Magnetic (Gyroscopically
Stabilized
C34e: ILS Glide Slope Receiving Equipment
C35d: Airborne Radio Marker Receiving Equipment
C36e: Airborne ILS Localizer Receiving Equipment
C40c: VOR Receiving Equipment
C41d: Airborne ADF Equipment
C113: Airborne Multipurpose Electronic Displays
C118: Traffic Alert and Collision Avoidance System
Airborne Equipment, TCAS I
C119b: Traffic Alert and Collision Avoidance System
Airborne Equipment, TCAS II
The following certification levels also apply to this product:
Environmental Certification Level:
RTCA/DO-160-E LED light source models (High
vibration and standard)
RTCA/DO-160-D (High vibration and standard)
Software Certification Level: RTCA/DO-178B level C
Installation of the SN3500 Primary Navigation Display in a type-
certificated aircraft must be performed in accordance with the
Sandel SN3500 Installation Manual, document number 82005-IM
applicable revision.
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE vi
CONVENTIONS USED IN THIS MANUAL
The name of a button is placed within square brackets when the
button is described in text. For example, “…press the [VUE]
selection button to …”
This manual uses terms, which should be familiar to aviation-
minded readers, such as “selected radial” and “magnetic
heading”. Terms, which are specific to the SN3500, will be
placed in the glossary.

82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE vii
TABLE OF CONTENTS
PILOT INFORMATION iii
COPYRIGHT iii
REVISION NOTICE iii
OPERATIONAL AND LEGAL ISSUES iv
APPROVALS v
CONVENTIONS USED IN THIS MANUAL vi
TABLE OF CONTENTS vii
TABLE OF FIGURES x
EFFECTIVITY, REVISION HISTORY AND ERRATA xiii
CHAPTER 1 WELCOME TO THE SN3500 1-1
What is the SN3500 1-1
CHAPTER 2 DISPLAY OVERVIEW 2-1
SN3500 Physical Features 2-1
Display Areas 2-1
Indicators 2-3
Data Color Coding 2-6
CHAPTER 3 BASIC OPERATION 3-1
Overview 3-1
Power-up Displays 3-1
Selecting the Data 3-2
Selecting the Primary NAV Source 3-3
Selecting and Displaying Bearing Pointers 1 & 2 3-4
Displaying the Map Data 3-4
360-degree FULL View and 70-degree ARC View 3-5
Auto-Slewing the Course Pointer 3-5
Course Pointer Sync 3-6
Heading Bug Sync 3-6
MEM Function 3-6
Display and Button Brightness (INTERNAL CONTROL) 3-7
Display and Button Brightness (EXTERNAL CONTROL) 3-8
CHAPTER 4 NAV OPERATION 4-1
GPS Mode Selection 4-1
Auto-Slew Function 4-2
Course Pointer Display Function 4-2
GPS INTEG / WAAS APPROACH ANNUNCIATIONS 4-3
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE viii
CHAPTER 5 LNAV / ROLL STEERING 5-1
Overview 5-1
What is “Roll Steering”? 5-1
LNAV and LNAV ARM 5-1
Intercepting an Active Leg (LNAV ARM) 5-2
“No Intercept” Message 5-3
LNAV Capture 5-3
HDG Preset Function during LNAV 5-3
HDG SYNC during LNAV 5-3
Flying a GPS approach 5-3
Flying a GPS transition to LOC/ILS 5-4
Flying a missed approach after an ILS 5-4
Cancelling LNAV Operations 5-4
Autopilot mode Selection Summary 5-4
Heading Bug Depiction Summary 5-5
ADVISORY MESSAGES ASSOCIATED WITH LNAV 5-5
CHAPTER 6 BEARING POINTERS 6-1
Bearing Pointers 6-1
BRG Menu 6-1
CHAPTER 7 MAP OPERATIONS 7-1
Overview 7-1
Internal Database 7-2
Map Controls and Displays 7-2
Map Memories 7-3
MAP DATABASE ITEMS 7-4
Getting Started - Example 7-6
Map Setup 7-7
Map Memory Settings 7-9
Storing Settings into Preset Memories 1-4 7-9
Removing a Map Memory from the Rotation Sequence 7-9
Restoring Default Settings 7-10
Copying Map Settings into the Scratchpad 7-11
Automatic Decluttering 7-12
Maximum Range of Internal Map Data 7-12
Clearing the Map Display 7-13
CHAPTER 8 WEATHER DISPLAY INTERFACE 8-1
WX-500 Stormscope® Data 8-1

82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE ix
WX Menu 8-1
FIS-B Datalink Weather 8-4
General Operation 8-4
Precipitation Intensity 8-5
FIS-B Lightning 8-5
FIS-B Services Backgrounder 8-6
Examples 8-8
CHAPTER 9 TRAFFIC DISPLAY INTERFACE 9-1
Traffic Symbology 9-1
Relative Altitude 9-2
Absolute Altitude vs. Relative Altitude 9-3
Traffic Display Mode 9-3
Altitude Mode 9-4
Traffic Overlay with Moving Map 9-4
TFC Menu 9-5
CHAPTER 10 FLAGS AND ABNORMAL CONDITIONS 10-1
CHAPTER 11 MESSAGES 11-1
CHAPTER 12 REVERSIONARY ATTITUDE MODE 12-1
Pilot Integrity Check 12-1
Reversionary Mode Display Description 12-2
Reversionary Mode Controls 12-3
Reversionary Mode Control Description 12-3
Attitude Display Details 12-4
Slip/Skid Indicator 12-4
Pitch Scale 12-5
Unusual Attitudes 12-6
Down Chevrons 12-6
Up Chevrons 12-7
Reversionary Mode Annunciations 12-8
CHAPTER 13 TECHNICAL SPECS AND OPERATING LIMITS13-1
CHAPTER 14 INSTALLATION INFORMATION 14-1
CHAPTER 15 GLOSSARY 15-1
CHAPTER 16 AVIONICS ACRONYMS 16-1
CHAPTER 17 SN3500 WITHOUT LED LIGHTING 17-1
Parked Heading Bug 17-1
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE x
Parked Course Pointer 17-2
Inner Course and Vertical Deviation Indicators 17-2
Outer Course and Vertical Deviation Indicators 17-2
Back Course Needle 17-2
Data Color Coding for SN3500s without an LED Light Source 17-3
Introduction Screen (Figure 3-1) 17-6
SN3500 Display with Compass Card (Figure 3-2) 17-7
360 degree FULL View 17-8
70 degree ARC View 17-8
NAV Menu (Figure 4-1) 17-9
BRG Main Menu (Figure 5-1) 17-9
Map Operation (Figure 6-1) 17-10
WX-500 Stormscope Display (Figure7-1) 17-10
WX Setup Menu (Figure 7-2) 17-11
FIS-B Weather Display (Figure 7-6) 17-11
Precipitation Example (Figure 7-10) 17-12
SN3500 with Traffic (Figure 8-1) 17-12
Traffic with moving map (Figure 8-2) 17-13
TABLE OF FIGURES
Figure 1-1 SN3500 Light Source Identification 1-2
Figure 2-1 SN3500 Physical Features 2-1
Figure 2-2 Display Areas 2-2
Figure 3-1 Introduction Screen 3-1
Figure 3-2 SN3500 Display with Compass Card 3-2
Figure 3-3 NAV Source Annunciations 3-3
Figure 3-4 Full View Figure 3-5 Arc View 3-5
Figure 3-6 Brightness 3-7
Figure 3-7 External Brightness Control Trim 3-8
Figure 4-1 NAV Menu 4-1
Figure 4-2 Auto-Slew Setup Menu 4-2
Figure 4-3 Course Pointer Setup Menu 4-2
Figure 4-4 Location of INTEG & WAAS Approach Annunciators 4-3
Figure 4-5 GPS WAAS Annunciator Descriptions 4-4
Figure 5-1 LNAV ARM Roll Steering Mode 5-2
Figure 6-1 BRG Main Menu 6-2
Figure 7-1 Map Operation 7-3
Figure 7-2 Map Setup Menu 7-7
Figure 7-3 Select "AIRSPC" 7-8
Figure 7-4 Select "ON" 7-8
Figure 7-5 Storing Settings 7-9

82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE xi
Figure 7-6 Removing Map Memory 7-10
Figure 7-7 Restoring Default Settings 7-11
Figure 7-8 Copying Map Settings 7-12
Figure 8-1 WX-500 Stormscope Display 8-1
Figure 8-2 WX Setup Menu 8-2
Figure 8-3 Display Menu 8-2
Figure 8-4 WX-500 Mode Menu 8-3
Figure 8-5 LTNG SRC Mode Menu 8-3
Figure 8-6 FIS-B Weather Display 8-4
Figure 8-7 Precipitation 8-5
Figure 8-8 FIS-B Lightning Strike Age 8-5
Figure 8-9 FIS-B Information Flow 8-7
Figure 8-10 Precipitation Example 8-8
Figure 8-11 Visible Moisture Observed 8-9
Figure 8-12 No Visible Moisture Observed 8-9
Figure 8-13 Between Layers 8-10
Figure 9-1 SN3500 with Traffic 9-1
Figure 9-2 Traffic with Moving Map 9-5
Figure 9-3 ON AUTO Menu 9-5
Figure 9-4 Altitude Range Menu 9-6
Figure 9-5 Altitude as Flight Level Menu 9-6
Figure 10-1 Messages 10-1
Figure 11-1 Message and "ACK" Button 11-1
Figure 12-1 Reversionary Mode Display 12-2
Figure 12-2 Reversionary Display Controls 12-3
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE xii
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82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE xiii
EFFECTIVITY, REVISION HISTORY AND ERRATA
Date: 2-MAR-2012
Applies to: SN3500 Software 4.05
SN3500 Pilot’s Guide 82005-PG, Revision M
With the exception of the superseding information contained in
this section, operation of the SN3500 is as described in the
SN3500 Pilot’s Guide referenced above.
Revision History
Revision Date Comments
M 2-Feb-2012
Updated for software version 4.05
Roll Steering operation modified.
Cover: New Image
Pages 2-1, 2-3, 2-4: Updated figure
for Roll Steering.
Pages 2-7, 2-8: Updated Data Color
Coding table.
Page 3-6: Updated figure: LNAV
annunciation color.
Chapter 5: New chapter for
LNAV/Roll Steering operation.
Chapters 6-17 renumbered.
Page 10-1: Changed CDI pointer
time delay to four minutes after
power-up.
Page 11-5: Added LNAV Cancelled.
Page 11-6: Added NAV SRC NOT
GPS.
Page 11-7: Added NO LNAV DATA.
Page 11-8: Added PUSH-HOLD
FOR HDG.
L 9-NOV-2011
Updated for software version 4.04
Page 2-2: Added description of
readouts for LNAV operations.
Page 2-3: Added outlined Heading
Bug description.
Page 2-4: Added description of GPS
track line.
Page 2-5: Added note about
CDI/VDI pointer shapes.
Page 2-7: Items added to Data
Color Coding table.
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE xiv
Pages 3-6 to 3-8: Added LNAV/Roll
steering.
Page 3-8 to 3-10: Updated
brightness control description.
Chapter 10: Added additional detail
to “400Hz Failed” message
description. Added NO INTERCEPT
and SELECT APPR messages.
Page 11-2: added note about
heading bug color while using roll
steering in the reversionary mode.
K1 29-NOV-2010
Updated for software version 4.03
Page 3-8: Added external
brightness control trimming
procedure.
Page 5-2: Updated Figure 5-1.
K 27-MAY-2010
Updated for software version 4.02
Page 2-3 and 2-7 optional heading
bug color
Pages 3-7display brightness control
Page 3-8 external brightness
Page 9-2 and 9-3 Heading/Gyro
flags
J1 24-AUG-2009
Updated for software version 4.01
Page 2-2: added new paragraph
describing 420 DME test mode.
J 25-FEB-2009
Updated for software version 4.00
Page V: added C3d, C4c
TOC: updated
Page XI: Effectivity updated.
Page 2-6: Added REV ATT heading
bug color.
Chapter 11: new
Chap. 12 – 16: renumber
Page 12-1: added C3d, C4c
I N/A Letter “I” intentionally not used.
H2 26-MAR-2009 Update for software version 3.07
H1 08-DEC-2008 Update for software version 3.06.
H 09-SEP-2008
Update for software version 3.05,
GPS WAAS Support
TACAN and NVIS references have
been removed from this revision of
the SN3500 Pilot’s Guide.
Customers using these features

82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE xv
reference the SN3500 Pilot’s Guide
Supplement 82005-PG-SUP
Page 4-3 & 4-4: GPS INTEG and
WAAS Approach Type Annunciators
added.
G 30-JUL-2008
Updated for software version 3.04,
TACAN and NVIS support.
Page iii: Patent number changes.
Page 1-2 NVIS compatibility
note.
Page 2-3: TACAN added to
course pointer NAV sources.
Page 2-4: TACAN added to
bearing pointer NAV sources.
Page 2-8: TACAN added to data
color coding.
Page 3-2: Marker beacon
annunciator added to figure 3-2
Page 3-7: NVIS activation menu
added.
Page 9-2: Revised to show that
flagged compass card remains in
view.
Page 10-1: Figure 10-1 changed
to show that flagged compass
card remains in view
Page 11-2: Low voltage
operation support noted.
F1 4/17/08
AR 994: Page XI, Effectivity
updated for software version 3.03.
No operational changes.
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE xvi
F 16-NOV-2007
Updated for software version 3.02
and LED backlight.
Page III: Patent information
updated.
Page V: Applicable TSO
information updated.
Illustrations updated to reflect
new data color coding.
Page 1-2: Images added to show
light source identification
information.
Data color coding tables updated
to reflect new data color coding.
Page 9-3: GPS “INTG”
annunciator added.
Page 11-1: Environmental
certification information updated.
Appendix added for illustrations
and data dolor coding specific to
units not equipped with an LED
light source.
E 21-SEP-2006
Updated for software version 3.01
Page 5-2: Updated section on
BRG Menu operation
D 17-NOV-2005
Updated for software version 3.00
Illustrations updated to remove
menu "M" icon on displays
Page 2-1: Added traffic and FIS-
B datalink weather
Page 3-1: Updated illustration to
show map revision letter
Page 3-2: Added traffic and WSI
Page 3-6: Revised paragraph on
Transitioning from GPS/FMS to
ILS
Page 3-7: Revised display
brightness operation
Chapter 7 expanded to include
FIS-B datalink weather
description
Page 8-4: Eliminated "NM" icon
for normal mode operation
Page 9-1: Removed reference to

82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE xvii
menu icon.
Page 14-2: Added FIS-B
C 13-SEP-2005
Updated for software version 2.01
Illustrations changed to reflect
revised colors
Page 2-3: Updated paragraph
on Course Pointer
Pages 2-5 & 2-6: Updated table
to reflect revised colors
Page 3-6: New paragraph
“Transitioning between
GPS/FMS and ILS”
Chapter 7 added paragraph on
color of Stormscope data
Chapter 8 added to reflect new
traffic interface option
Chapter 9 revised to expand
description of gyro/fluxgate flags
and add description of traffic
flags
B 24-JUN-2005
Commercial Release
A 19-APR-2005 Initial Release
No errata applicable to this release.
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE xviii
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WELCOME TO THE SN3500
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 1-1
CHAPTER 1 WELCOME TO THE SN3500
What is the SN3500
For years, pilots of large commercial aircraft have appreciated
the benefits of Electronic Flight Instrumentation Systems,
commonly known as EFIS. Full EFIS systems combine data
from different sources within the aircraft and provide the pilot
with a unified display. This greatly simplifies the instrument scan
and improves situational awareness.
The Sandel SN3500 Primary Navigation Display is an enhanced
Electronic Horizontal Situation Indicator (EHSI) which packs the
essential features of an EFIS NAV display plus enhanced
features into a standard three-inch instrument, but at a fraction of
the cost of a traditional EFIS. By combining the functions of an
electromechanical HSI, an RMI, a moving map and a
Stormscope® display into one instrument, the SN3500 ties
together the critical elements of situational awareness. And by
adding to that a 3-light marker beacon and GPS annunciator
displays, the SN3500 becomes the virtual equivalent of an EFIS
NAV display, sized and priced for general aviation cockpits.
The SN3500 Primary Navigation Display uses Sandel’s patented
rear-projection display technology. This technology allows the
displayed image to extend to the edges of the instrument’s bezel.
This provides an image approximately the size of a four inch
primary display in a three inch form factor.
Internally, the SN3500 uses high-speed digital converters that
allow it to receive signals from virtually every type of navigation
receiver ever installed in general aviation aircraft. A
comprehensive set of maintenance pages allows the installer to
simply specify the make and model of the installed equipment,
and the SN3500 will configure itself accordingly.
The SN3500 shatters the price and size barriers of traditional
EFIS systems. With a full color display and a simple intuitive
user interface, the SN3500 brings high-end EFIS functions to the
general aviation cockpit.
The SN3500 is equipped with one of two types of projection light
sources. Current production SN3500s incorporate a LED light
source for improved color and longer life. Earlier SN3500s can
be modified to include the LED lighting, contact Sandel for more
information.
WELCOME TO THE SN3500
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 1-2
Figure 1-1 SN3500 Light Source Identification
At startup the SN3500 will display one of two introduction
screens (see figure 1-1). The screen on the left is displayed
when the SN3500 is equipped with LED lighting. The screen on
the right is displayed when the SN3500 is not equipped with LED
lighting.
The figures in the main body of this guide (chapters 2 through
14) include the image colors as depicted on an SN3500
equipped with LED lighting. Colors used in SN3500s without
LED lighting are found in chapter 15 located at the end of this
guide.

DISPLAY OVERVIEW
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 2-1
CHAPTER 2 DISPLAY OVERVIEW
SN3500 Physical Features
The SN3500 physical layout consists of a full three inch display,
eleven backlit pushbuttons, two knobs with push to select, and
one USB connector.
Navigation
Weather
Traffic
Course Pointer Knob
Map
View: Full or Arc
Range Up
Range Down
Heading Bug
Knob/Roll
Steering Selector
USB Connector
Memory
Bearing
Clear
Menu
Figure 2-1 SN3500 Physical Features
The following section of the manual describes the appearance of
the SN3500 display and identifies each functional element.
Detailed descriptions of these elements and a tutorial guide to
their use are presented in later sections.
Display Areas
The primary display area shows either a 360-degree FULL view
or a 70-degree ARC view, as indicated by the white compass
ring. The white airplane or triangle represents the aircraft’s
current position. The primary display area may also depict the
current GPS flight plan, airports, navaids, intersections, airspace,
traffic, FIS-B datalink weather and/or Stormscope® data if the
map feature has been enabled. Several indicators (see below)
are also presented within the primary display area.
DISPLAY OVERVIEW
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 2-2
Figure 2-2 Display Areas
The upper display area presents data from the selected course
navigation instrument. The data displayed depends upon the
navigation source (VOR/DME, or GPS) but it will generally
include bearing, distance, and ground speed, if available. The
upper display area also includes information on the map status,
WX-500 Stormscope® status (if installed), and an annunciation
on whether the VOR NAV display is currently receiving either a
localizer or a full ILS (localizer/glideslope) signal.
The lower display area presents the numeric data associate with
the two bearing pointers. This includes the NAV source, bearing
and distance (if available). The right section of this area contains
a display of the marker beacon lights if configured and heading
data during LNAV operations. The left section includes GPS
annunciators, if configured.
When the SN3500 is connected to a DME supporting ARINC
429, the SN3500 DME distance and speed readouts will
alternate between flagged and normal at a rate of 1Hz. while the
associated DME is in test mode.
Upper
display
area
Lower
display
area
Primary
display
area

DISPLAY OVERVIEW
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 2-3
Indicators
Several different symbols, or indicators, are used in each of the
display areas. These are described below:
Lubber line [white]: Points to the magnetic heading. It is
always at the top of the display.
Heading bug [orange or white]: This can be set to a
desired heading by rotating the Heading Select knob
(right knob). Pressing the Heading Select knob will SYNC the
heading bug with the lubber line, allowing the pilot to immediately
set the heading bug to the current heading. Software version
4.02 provided an installation selectable heading bug color.
Parked heading bug: When the display is in
the 70-degree ARC mode using the [VUE]
button, it is possible for the heading bug to be
positioned off of the screen. When this
happens, the heading bug “parks” at the side
of the screen nearest to its actual position,
with the symbol displayed smaller than
normal and close to the edge of the screen.
Heading bug [outlined]: Indicates that LNAV is the
active heading source and the heading bug is
disconnected from the autopilot. GPS Roll
Steering information is output to the
autopilot HDG mode.
Course pointer: By rotating the
Course Select knob (left knob), you
can set the course pointer to the
desired course to a VOR NAV source.
When a long-range NAV source is selected,
the course pointer can automatically rotate
to the desired track being sent by the NAV
source (i.e. “Auto-slew”). A unique course
pointer setting is maintained for each NAV source selection.
DISPLAY OVERVIEW
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 2-4
Parked course pointer: When the display is
in the 70-degree ARC mode, it is possible for
the head of the course pointer to be positioned
off of the screen. When this happens, the
course pointer “parks” at the side of the screen
nearest to its actual position, with the symbol
displayed smaller than normal and close to the
edge of the screen.
Bearing pointers 1 and 2: Two bearing pointers
are `provided. Bearing pointer 1 (BRG1) is
represented by the closed tip arrowhead symbol. Bearing
pointer 2 (BRG2) is represented by the open tip arrowhead
symbol. Depending on the user-selected settings, these pointers
may show the bearing to a VOR, ADF, or GPS waypoint. The
numeric information from the instruments assigned to these
pointers is displayed in the lower display area. The information
is displayed in the same color as the associated bearing pointer.
Also note that the tail of each pointer can be used to determine
the bearing from the selected NAV source.
GPS Track: The white
dotted line extending from
the “own aircraft” symbol
indicates the aircraft GPS
ground track. This line is
removed when ground
track is not available or
when the map is off.
GPS Track

DISPLAY OVERVIEW
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 2-5
Inner Course and Vertical
Deviation Indicators: The
course deviation indicator
bar (CDI; also known as the
deviation bar or “D-bar”) is
the movable center section
of the course pointer that
depicts deviation to the left
or right of course. The
vertical deviation indicator
bar (VDI) is the movable
center section that depicts
vertical deviation above or
below glideslope or GPS
final approach path. The VDI is only available when tuned to a
glideslope or a vertical deviation from the GPS. Note that the
inner CDI and VDI are not visible when the map display is
enabled.
Outer Course and Vertical Deviation
Indicators: The CDI and VDI are also
repeated at the bottom and right side of the
display – this is referred to as the outer
CDI and outer VDI. There are two shapes
of outer CDI and VDI pointers that can be
configured during installation – bar and
triangle. When triangle pointers are
configured, the inner VDI is not visible even when the map
display is not enabled.
Back course: When flying a
back course approach, the
course pointer should be set to the
published front course. The CDI will
automatically reverse sense when
the course pointer is more than +/-
90 degrees from the lubber line.
The label “BC” will appear above the
CDI and a yellow “X” will block the
outer VDI during a back course
approach as a reminder to the pilot
as shown in the adjacent figure.
Inner CDI
Inner VDI Outer CDI
Outer VDI
DISPLAY OVERVIEW
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 2-6
Data Color Coding
All images in this pilots guide reflect the data color coding used
in units that utilize the LED light source. Users of units without an
LED light source should refer to the appendix for images that
reflect the proper data color coding. The light source can be
identified by observing the introduction screen – see page 1-2 for
details.
Data displayed on the SN3500 is color coded as follows:
Color Data displayed
GREEN

Information associated with the primary
VHF NAV1 receiver (or NAV2 if in co-pilot
configuration)
GPS annunciators: ACTV, AUTO and
LEG
Class B and C airspace
Stormscope® data older than 30 seconds
CYAN

Information associated with the LNAV
(GPS/FMS) receiver text
GPS annunciators: HLD, PTK and APPR
(II Morrow GPS only)
Map status bar icons
Moving map icons
Traffic range ring
Current position symbol, either airplane or
triangle
Map range scale

DISPLAY OVERVIEW
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 2-7
Color Data displayed
WHITE
Compass rose under normal conditions
Magnetic heading and button labels
Non-active legs and waypoints of flight
plan
To/From indicator
Inner marker indicator
Traffic targets
New Stormscope® data
ADF bearing pointers / text
Map range
Optional Heading bug selection
Heading bug (Reversionary Attitude
Display)
GPS Track Line
LNAV Annunciator
RED Flags indicating failed glide slope or CDI
data
Prohibited airspace
AMBER
GPS annunciators: MSG and WPT. Also
HOLD (Garmin only)
Compass rose when either gyro or
fluxgate has failed
Middle marker indicator
DISPLAY OVERVIEW
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 2-8
Color Data displayed
YELLOW

Information associated with the cross-side
NAV receiver (NAV2 if in the pilot
configuration, NAV1 if in the co-pilot
configuration)
Restricted and warning areas
Flag indicating invalid glide slope
Marker test
Decluttered map status icons
NO INTCPT annunciator
MAGENTA

Active leg and waypoint of flight plan
LOC1 / LOC2 Indicator
ILS1 / ILS2 Indicator
BLUE

Outer marker indicator
PURPLE

MOA
ORANGE

Heading Bug and associated data

BASIC OPERATION
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 3-1
CHAPTER 3 BASIC OPERATION
Overview
The SN3500 is configurable and controllable to provide the
information needed at any point in the flight. Configuring the
SN3500 refers to selecting the data for a given display. For
example, a VOR or GPS receiver can drive a bearing pointer.
Controlling the SN3500 refers to tailoring the display to suit the
immediate situation. For example, the pilot may decide to turn
off a bearing pointer completely during the enroute portion of the
flight and use it only during an approach.
Power-up Displays
On initial power-up, a short introduction screen will be displayed
which indicates the software and database (NavData) versions.
Figure 3-1 Introduction Screen
BASIC OPERATION
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 3-2
After a few seconds this display will be removed and the
compass card will be shown as below:
Figure 3-2 SN3500 Display with Compass Card
Selecting the Data
Sensor data is data that comes from avionic sources within the
aircraft. This includes primary navigational instruments as well
as sensors. The SN3500 can display data from the following
sources:
Compass system (directional gyro and fluxgate)
NAV1 and NAV2 receivers
LNAV1 and LNAV2 receivers (GPS/FMS)
DME1 and DME2
ADF1 and ADF2
Marker beacon receiver
Weather detection (WX-500 Stormscope® and/or WSI)
Traffic

BASIC OPERATION
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 3-3
Heading data from the directional gyro and fluxgate compass is
always applied directly to the SN3500’s compass card display,
while other types of sensor data can be displayed in several
different ways. You can control these displays by configuring the
course pointer, the bearing pointers, the map data and the
weather data.
Selecting the Primary NAV Source
The SN3500’s course pointer and CDI can be driven from VOR
or GPS data.
In some installations, the [NAV] button on the SN3500 is used to
select the primary NAV source. In others, an external switch
performs this function and the [NAV] button has no effect. Refer
to the Aircraft Flight Manual Supplement for the details of the
installation. If external switching is used, this section does not
apply.
Pressing the [NAV] button will cycle through the available
choices, which are specific to your aircraft and were configured
during installation. Selecting a primary navigation source also
connects it to the autopilot, if configured.
The current NAV source selection will be annunciated next to the
NAV button as shown below.
Figure 3-3 NAV Source Annunciations
Depending on the configuration of the aircraft, the available
choices are NAV1, NAV2, GPS1, GPS2, FMS1 and FMS2. If the
selected NAV source is a VOR receiver tuned to a localized
frequency, the annunciation will be either LOC1 or LOC2. If a
valid glide slope signal is detected then the annunciation will be
either ILS1 or ILS2.
Numeric data from the primary NAV source, such as distance,
bearing and groundspeed will be displayed in the upper display
area if available.
BASIC OPERATION
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 3-4
In some installations, the ILS Lockout function may be enabled
on the SN3500. This function forces the selection of the NAV
receiver when an ILS frequency is selected. Refer to the Aircraft
Flight Manual Supplement to see if the ILS Lockout function has
been enabled in the aircraft being operated.
While NAV1 is tuned to an ILS frequency and the ILS Lockout is
in effect, pressing the [NAV] button will not change sources.
Instead, the following message is displayed: “NAV TUNED TO
ILS”. To defeat the override and restore the function of the
[NAV] button, simply select a non-ILS frequency in the NAV1
receiver.
Selecting and Displaying Bearing Pointers 1 & 2
To display the bearings pointers, press [BRG] to cycle through
available selections. In addition to no bearing pointer display,
there are three selections:
Push [BRG] once: Bearing pointer 1 only
Push [BRG] twice: Bearing pointer 2 only
Push [BRG] third time: Bearing pointers 1 and 2
Details about the bearing pointers are in Chapter 5 of this Pilot’s
Guide.
Displaying the Map Data
Map data consists of flight plan waypoints from the LNAV
receiver (GPS/FMS), as well as nearby airports, navaids,
intersections and airspace from the SN3500’s internal database.
The different categories of map information can be enabled or
disabled individually.
To display the map data, press [MAP] to cycle through the
available map memory locations. The currently displayed map
memory setting is displayed next to the MAP button. In addition
to the no map data display, there are three default map memory
settings. These setting are shown below with the displayed map
status bar icons:
Map Memory 1: [no icon] GPS/FMS flight plan
Map Memory 2: Airports, Airspace, and GPS/FMS flight
plan
Map Memory 3: VORs and GPS/FMS flight plan

BASIC OPERATION
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 3-5
When map data is being displayed, press [ ] or [ ] to increase
or decrease the map range respectively. The currently selected
map range is displayed in the upper right display area in
magenta. The value of the map range represents the distance
from the aircraft symbol to the outer edge of the compass rose.
Map operation is covered in more detail in Chapter 6.
360-degree FULL View and 70-degree ARC View
The SN3500 allows the pilot to switch between a traditional 360-
degree FULL view of the compass rose and a forward-looking
70-degree ARC view. The ARC view places the airplane symbol
at the bottom of the screen and the top 70-degrees of the
compass rose is displayed. The ARC view maximizes the
display of the ground track ahead of the aircraft and provides the
greatest amount of screen area for map data.
Figure 3-4 Full View Figure 3-5 Arc View
Press [VUE] to switch between the 360-degree and 70-degree
ARC views. This action only affects the screen display – all
navigation sources, bearing pointers, and other settings remain
the same.
Auto-Slewing the Course Pointer
One unique feature of the SN3500 is its ability to automatically
rotate the course pointer to the desired course being sent
digitally from the GPS/FMS. This feature is called “auto-slew”,
and is especially useful when flying a complex flight plan as it
BASIC OPERATION
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 3-6
eliminates the burden of manually setting the course pointer for
each leg of the flight plan.
When auto-slew is activated and a GPS/FMS is selected as the
NAV source, rotating the course select knob will have no effect
on the course pointer and the message ‘AUTO – SLEW ACTIVE”
will be displayed in the center display area.
Note that certain GPS receivers such as the KING KLN-90 and
Garmin GNS 430/530 support an “OBS” or “HOLD” mode which
will override auto-slew when active.
The auto-slew function is enabled/disabled in the NAV menu as
described in Chapter 4.
Course Pointer Sync
To rapidly set the course pointer to the current direct-to course,
press and release the course select knob.
When no valid gps course information is available, such as when
flying a LOC/ILS approach, pressing the course select knob
inwards will rotate the course pointer to the current heading.
Heading Bug Sync
To rapidly set the heading bug to the aircraft’s current heading,
press and release the Heading select knob.
MEM Function
The SN3500 maintains two different groups of display
configuration memories that are toggled by pressing [MEM]. By
pressing the [MEM], one can rapidly swap back and forth
between the two display configurations. This allows the pilot to
set up a particular screen display and easily access the settings
for later use. The MEM Function remembers the last settings
prior to pressing [MEM].
For example, a preferred “enroute” setup might be 70-degree
ARC view with only bearing pointer 1 displayed, connected to a
VOR navaid. The “approach” setup might be 360-degree view
with bearing pointer 2 displayed, connected to an ADF. To
configure these two screens, first set up the “enroute” screen
with the proper settings. Then press [MEM] to toggle to the
second screen. The second screen can now be configured with

BASIC OPERATION
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 3-7
the “approach” settings. Press [MEM] to toggle between the two
screens configured for “enroute” and ‘approach”.
Pressing and holding the [MEM] button will cause the two
memories to have the same display settings. “COPY MEM” will
be displayed momentarily to confirm this action.
Display and Button Brightness (INTERNAL CONTROL)
Both the display and button backlight brightness can be
controlled through the menu. The display brightness “BRT” and
the button backlight brightness “BTN” are adjusted using the
same technique as follows.
Figure 3-6 Brightness
Press [M] to activate menu mode.
Rotate left knob until “BRT” (for display brightness) or
“BTN” (for button brightness) is highlighted in the far left
column.
Turn the right knob to increase (larger number) or
decrease (smaller number) the brightness to the desired
level.
Press [M] to exit the menu and return to normal
operation.
When configured for internal brightness control, the SN3500 will
power up to the last brightness level set.
Press and hold [CLR] will steadily ramp up the display brightness
without requiring entry into any menus.
BASIC OPERATION
82005-PG, REV M SANDEL SN3500 PILOT’S GUIDE PAGE 3-8
Display and Button Brightness (EXTERNAL CONTROL)
When the SN3500 is configured to use an external cockpit
lighting control bus, the brightness menu provides a trim setting
to balance the brightness level with other aircraft instruments at
low brightness settings. At high brightness settings this setting
will have not effect. The display brightness selection will appear
as shown below:
Figure 3-7 External Brightness Control Trim
Press [M] to activate menu mode.
Turn the right knob to increase (larger number) or
decrease (smaller number) the brightness to the desired
level.
Press [M] to exit the menu and return to normal
operation.
When configured for external brightness control, the SN3500 will
power up to the external control bus.
NOTE: The SN3500 will revert to internal brightness
control if it detects a broken connection from the external
brightness cockpit lighting bus. In this condition press
and hold of [CLR] will steadily ramp up the display
brightness without requiring entry into any menus.