Sandel sn3500 ehsi Manual

82005-PG-D SANDEL SN3500 EHSI PILOT'S GUIDE
SN3500 EHSI
Navigation Display
Pilot’s Guide
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE II
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82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE III
Pilot information
Publication Date: November 17, 2005
This guide provides information on the use and operation of the
SN3500 EHSI.
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 2005 Sandel Avionics, Inc.
May be covered by one or more U.S. and foreign pending and
issued patents including U.S. Patent Numbers 6,750,788,
6,670,892, 6,507,288 and 6,259,378.
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 IX of
this Pilot’s Guide.
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
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE IV
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.
Approvals
The FAA has approved the SN3500 under the following TSO:
TSO-C113 AMED (Airborne Multipurpose Electronic
Displays)
The following certification levels also apply to this product:
Environmental Certification Level: DO-160-D
Software Certification Level: DO-178B level C
Installation of the SN3500 EHSI in a type-certificated aircraft must
be performed in accordance with the Sandel SN3500 EHSI
Installation Manual, document number 82005-IM applicable revision.
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-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE V
Table of Contents
Pilot information iii
Copyright iii
Revision notice iii
Operational and legal issues iii
Approvals iv
Conventions Used in This Manual iv
Table of Contents v
Table of Figures viii
Effectivity, Errata and Revision History ix
CHAPTER 1 WELCOME TO THE SN3500 EHSI 1-1
What is the SN3500 1-1
CHAPTER 2 DISPLAY OVERVIEW 2-1
SN3500 Physical Features 2-1
Display Areas 2-1
Indicators 2-2
Data Color Coding 2-5
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 3-4
Auto-Slewing the Course Pointer 3-4
Heading Bug Sync 3-4
Course Pointer Sync 3-4
Transitioning from GPS/FMS to ILS 3-4
MEM Function 3-4
Display and Button Brightness 3-4
CHAPTER 4 NAV OPERATION 4-4
GPS Mode Selection 4-4
Auto-Slew Function 4-4
Course Pointer Display Function 4-4
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE VI
CHAPTER 5 BEARING POINTERS 5-4
Bearing Pointers 5-4
BRG Menu 5-4
CHAPTER 6 MAP OPERATIONS 6-4
Overview 6-4
Internal Database 6-4
Map Controls and Displays 6-4
Map Memories 6-4
MAP DATABASE ITEMS 6-4
Getting Started - Example 6-4
Map Setup 6-4
Map Memory Settings 6-4
Storing Settings into Preset Memories 1-4 6-4
Removing a Map Memory from the Rotation Sequence 6-4
Restoring Default Settings 6-4
Copying Map Settings into the Scratchpad 6-4
Automatic Decluttering 6-4
Maximum Range of Internal Map Data 6-4
Clearing the Map Display 6-4
CHAPTER 7 WEATHER DISPLAY INTERFACE 7-4
WX-500 Stormscope® Data 7-4
WX Menu 7-4
FIS-B Datalink Weather 7-4
General Operation 7-4
Precipitation Intensity 7-4
FIS-B Lightning 7-4
FIS-B Services Backgrounder 7-4
Examples 7-4
CHAPTER 8 TRAFFIC DISPLAY INTERFACE 8-4
Traffic Symbology 8-4
Relative Altitude 8-4
Absolute Altitude vs. Relative Altitude 8-4
Traffic Display Mode 8-4
Altitude Mode 8-4
Traffic Overlay with Moving Map 8-4
TFC Menu 8-4

82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE VII
CHAPTER 9 FLAGS AND ABNORMAL CONDITIONS 9-4
CHAPTER 10 MESSAGES 10-4
CHAPTER 11 TECHNICAL SPECS AND OPERATING LIMITS11-4
CHAPTER 12 INSTALLATION INFORMATION 12-4
CHAPTER 13 GLOSSARY 13-4
CHAPTER 14 AVIONICS ACRONYMS 14-4
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE VIII
Table of Figures
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 3-4
Figure 3-6 Brightness menu 3-4
Figure 4-1 NAV menu 4-4
Figure 4-2 Auto-Slew setup menu 4-4
Figure 4-3 Course pointer setup menu 4-4
Figure 5-1 BRG main menu 5-4
Figure 6-1 Map operation 6-4
Figure 6-2 Map setup menu 6-4
Figure 6-3 Select "AIRSPC" 6-4
Figure 6-4 Select "ON" 6-4
Figure 6-5 Storing settings 6-4
Figure 6-6 Removing map memory 6-4
Figure 6-7 Restoring default settings 6-4
Figure 6-8 Copying map settings 6-4
Figure 7-1 WX-500 Stormscope display 7-4
Figure 7-2 WX setup menu 7-4
Figure 7-3 Display menu 7-4
Figure 7-4 WX-500 mode menu 7-4
Figure 7-5 LTNG SRC mode menu 7-4
Figure 7-6 FIS-B weather display 7-4
Figure 7-7 Precipitation 7-4
Figure 7-8 FIS-B lightning strike age 7-4
Figure 7-9 FIS-B information flow 7-4
Figure 7-10 Precipitation example 7-4
Figure 7-11 Visible moisture observed 7-4
Figure 7-12 No visible moisture observed 7-4
Figure 7-13 Between layers 7-4
Figure 8-1 SN3500 with traffic 8-4
Figure 8-2 Traffic with moving map 8-4
Figure 8-3 ON AUTO menu 8-4
Figure 8-4 Altitude range menu 8-4
Figure 8-5 Altitude as flight level menu 8-4
Figure 9-1 Messages 9-4
Figure 10-1 Message and "ACK" button 10-4

82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE IX
Effectivity, Errata and Revision History
Date: 11/17/05
Revision: 3.00
Applies to: SN3500 Software 3.00
SN3500 Pilot’s Guide 82005-PG-D
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 Date Comments
D 11/17/05
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
menu icon.
•Page 14-2: Added FIS-B
C 9/13/05
Updated for software version 2.01
•Illustrations changed to reflect
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE X
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 6/24/05
Commercial Release
A 4/19/05
Initial Release
No errata applicable to this release.

WELCOME TO THE SN3500 EHSI
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 1-1
CHAPTER 1 WELCOME TO THE SN3500 EHSI
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 Electronic Horizontal Situation Indicator, or
EHSI, packs the essential features of an EFIS NAV display into a
standard three-inch instrument, but at a fraction of the cost of a
traditional EFIS. By combining the functions of an 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 EHSI 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.
WELCOME TO THE SN3500 EHSI
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 1-2
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DISPLAY OVERVIEW
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 2-1
CHAPTER 2 DISPLAY OVERVIEW
SN3500 Physical Features
The SN3500 EHSI physical layout consists of a full three inch
display, eleven backlit pushbuttons, two knobs with push to select,
and one USB connector.
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-D SANDEL SN3500 EHSI 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. The left section
includes GPS annunciators, if configured.
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.
Upper
display
area
Lower
display
area
Primary
display
area

DISPLAY OVERVIEW
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 2-3
Heading bug [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.
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.
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.
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.
DISPLAY OVERVIEW
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 2-4
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
Indicator: 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.
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-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 2-5
Data Color Coding
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
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
•Heading bug and associated data
•Traffic targets
•New Stormscope® data
DISPLAY OVERVIEW
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 2-6
Color Data displayed
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
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
MAGENTA
•Active leg and waypoint of flight plan
•ADF bearing pointers
•Map range
BLUE •Outer marker indicator
PURPLE •MOA

BASIC OPERATION
82005-PG-D SANDEL SN3500 EHSI 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, either the VOR or the 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 includes the software and database versions.
Figure 3-1 Introduction screen
After a few seconds this display will be removed and the compass
card will be shown as below:
BASIC OPERATION
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 3-2
Mag . heading
Course
pointer
Heading bug
DME
groundspeed
To /from
indicator
DME distance
Bearing
pointer 2
Bearing
pointer 2
source and
bearing
Bearing
pointer 1
Bearing
pointer 1
source and
bearing
Selected
course Selected heading
Current NAV
source
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-D SANDEL SN3500 EHSI 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-D SANDEL SN3500 EHSI 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-D SANDEL SN3500 EHSI 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
BASIC OPERATION
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 3-6
especially useful when flying a complex flight plan as it 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. 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.
Heading Bug Sync
To rapidly set the heading bug to the aircraft’s current heading,
press and release the Heading select knob.
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 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.
Transitioning from GPS/FMS to ILS
During an ILS approach, when the selected NAV source changes
from GPS/FMS to LOC/ILS, it may be necessary to rotate the
course pointer to the proper inbound course setting. The course
pointer is NOT set automatically by the SN3500.
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.

BASIC OPERATION
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 3-7
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 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
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 menu
•Press [M] to activate menu mode.
•Press [CLR] to display the brightness menu.
•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.
BASIC OPERATION
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 3-8
To rapidly change display to full brightness, press and hold [CLR]
until the display changes to full brightness. Power cycling the
SN3500 will also return the unit to full brightness.

NAV OPERATION
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 4-1
CHAPTER 4 NAV OPERATION
GPS Mode Selection
GPS/FMS units can be set for automatic or manual sequencing of
waypoints in the active flight plan. This can be set on the SN3500
through the NAV Menu or may be available on an external switch.
Figure 4-1 NAV menu
•Press [M] to activate menu mode.
•Press [NAV] to display the NAV menu.
•Rotate the left knob until “GPS MODE” is highlighted in the
far left column.
•Press the Right knob to toggle the setting between “AUTO”
and “OBS”. (Note: The terminology may differ according to
the model of GPS/FMS interfaced to the SN3500.)
•Press [M] to exit the menu and return to normal operation.
Auto-Slew Function
Auto-slew function enables the automatic operation of the course
pointer when a GPS/FMS is selected as the main NAV source.
NAV OPERATION
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 4-2
Options are AUTO and OFF. When set to auto, the course pointer
cannot be set manually if the GPS/FMS is navigating on a flight plan
or a direct-to course.
Figure 4-2 Auto-Slew setup menu
•Press [M] to activate menu mode.
•Press [NAV] to display the NAV menu.
•Rotate the left knob until “SLEW” is highlighted in the far left
column.
•Turn the Right knob to select the desired option on the right.
•Press [M] to exit the menu and return to normal operation.
Course Pointer Display Function
Controls the display of the course pointer when GPS is selected as
the NAV source and the moving map is displayed. Options are
AUTO and ON. When set to AUTO, the course pointer is removed
when the flight plan waypoints and course lines are displayed. This
reduces the on-screen clutter. The course pointer will be displayed
momentarily when the course select knob is turned.
Figure 4-3 Course pointer setup menu
•Press [M] to activate menu mode.
•Press [NAV] to display the NAV menu..

NAV OPERATION
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 4-3
•Rotate the left knob until “CRS PTR” is highlighted in the far
left column.
•Rotate the heading bug knob to select the desired option.
•Press [M] to exit the menu and return to normal operation.
NAV OPERATION
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 4-4
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BEARING POINTERS
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 5-1
CHAPTER 5 BEARING POINTERS
Bearing Pointers
The SN3500 provides two independent bearing pointers which
function in much the same way as a traditional radio magnetic
indicator (RMI). The head of each bearing pointer indicates the
bearing to the NAV source. The tail of each pointer indicates the
bearing from the NAV source. Either pointer can be driven by any
navigation source interfaced to the SN3500: VOR, GPS/FMS, or
ADF. When a GPS/FMS is selected as the bearing pointer source,
the bearing pointer indicates the bearing and distance to the current
active waypoint.
To display the bearings pointers, press [BRG] repeatedly to cycle
through displaying bearing pointer 1 only, displaying bearing 2 only,
displaying both bearing pointers 1 & 2 and disabling both bearing
pointers.
The color of each bearing pointer, and its associated numeric
display, follow the color-coding when on-side:
ADF: Magenta
GPS: Cyan
VOR: Green (NAV1), Yellow (NAV2)
The cross-side color of the bearing pointer, and its associated
numeric display, is yellow when NAV1 is selected and green when
NAV2 is selected.
The digital numeric bearing to the navigation source of the bearing
pointer is displayed at the bottom of the screen. When the data is
invalid, “---“ is displayed and the associated bearing pointer is
removed from the screen. The selected bearing pointer name is
displayed above the numeric bearing display.
Note. Certain ADF receivers may not supply an “invalid” signal. In
these cases, the receiver will “park” the needle, usually 90°to the
right of the lubber line, when no signal is being received. See the
Pilot’s Guide for your navigation receiver to determine its capability
during “No-signal” operation.
BEARING POINTERS
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 5-2
BRG Menu
The NAV sources for the bearing pointers are selected using the
BRG menu function.
Figure 5-1 BRG main menu
•Press [M] to activate menu mode.
•Press [BRG] to display the BRG menu
•Rotate the left knob to select BRG1 or BRG2 in the left
column.
•Rotate the right knob to select the desired option.
•Press [M] to exit the menu and return to normal operation.

MAP OPERATIONS
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 6-1
CHAPTER 6 MAP OPERATIONS
Overview
MAP operations allow you to display navigation information in the
form of a “moving map” directly on the SN3500 display. You have
extensive control over what kinds of navigation information are
displayed on the map:
•Airports and Runways
•Controlled and Special Use Airspace
•VORs
•NDBs
•Intersections
•GPS Flight Plans and Approaches
Within each of these classes of map objects you may fine-tune
exactly which items you want displayed. For example, you may
choose to exclude military or private airports, or those with unpaved
runways or runways shorter than a particular length. Similarly, you
may elect not to display terminal VORs or low-powered NDBs, or to
display Class B airspace and Restricted Areas but exclude Class C
airspace and MOAs. As you will see, the SN3500 offers great
flexibility in how you configure your moving map display.
Finally, you may store up to four different map configurations, and
then quickly switch from one to another as appropriate to your
phase of flight. For instance, when cruising at FL180 or higher, you
might want to display only high-altitude VORs, Special Use Airspace
and airports with paved runways of 6,000 feet or longer. The
SN3500 allows you to save such a map configuration in one of four
map memories and then recall it as needed.
All the airports, navaids and intersections on the moving map,
except for the GPS/FMS flight plan waypoints, come from the
internal database of the SN3500 and are color-coded cyan.
Controlled and Special Use Airspace also comes from the SN3500’s
internal database and are color-coded according to its type (Class B
and Class C in green, MOAs in purple, Restricted and Warning
Areas in yellow, and Prohibited Areas in red.) The GPS/FMS flight
MAP OPERATIONS
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 6-2
plan waypoints and course line come from the database in the
GPS/FMS and are color-coded magenta or white.
Note: The SN3500 requires a connection to a GPS/FMS receiver in
order to display the moving map. The map display, including the
flight plan from the GPS1 receiver, will also be shown when NAV1
or NAV2 is selected as the primary NAV source.
Internal Database
Non-flight plan data including airspace is referred to as the “internal
database” and is stored in the SN3500’s internal memory. The
internal database can be periodically updated from a Windows-
based PC. The expiration date of the internal database is shown
during the power on sequence. Database updates are available
directly from Sandel Avionics, and may be purchased at
www.sandel.com by your dealer. As this database is for
supplemental use only and not intended for primary navigation,
there is no requirement to update it.
Map Controls and Displays
Information associated with control of the map is displayed as
follows:
•The map status bar is shown just to the right of the MAP
button and shows icons for the currently enabled map
items.
•The map memory location currently being displayed is
shown at the top of the map status bar as “1”, “2”, “3”, “4” or
“S”.

MAP OPERATIONS
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 6-3
Figure 6-1 Map operation
Map operations are controlled with the following buttons:
•[MAP] - Press repeatedly to cycle through the map memory
locations and no MAP.
•[ ⇑] and [ ⇓] - Press to zoom the map range in or out.
Press and hold the [ ⇑] button to auto-range the map to the
current waypoint. Press and hold the [ ⇓] to auto-range
the map to the final waypoint.
Map Memories
The [MAP] button cycles from MAP off through a maximum of four
possible map memory locations, or memories, plus a scratchpad
memory. The map memory that you are currently displaying is
shown at the top of the map status bar and will show 1, 2, 3, 4 or S.
Any memory that is empty is skipped during the MAP rotation
sequence. In the default setup of the SN3500, memories 1, 2 and 3
contain default settings, and memories S and 4 are empty.
Map memory S has been designated the scratchpad memory and
the remaining memories 1-4 are designated as preset memories.
All on-screen changes are made to S but can be copied to
memories 1-4 as desired. The purpose of having a separate
scratchpad is to allow you to quickly add or delete items from your
map display to attend to a current flight situation, without changing
presets previously made.
MAP OPERATIONS
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 6-4
The map setup function, described below, shows how to make
changes to the map memories. The following table lists the items
that can be independently configures for each map memory.
There are a large number of selection items. However, the
organization of the SN3500 is intended to make the map setup
process as easy as possible. You should experiment with the map
settings until you develop the style of operation best suited for your
flying.
MAP DATABASE ITEMS
Status bar icons Item Setup Menu
Label Color
Civil CIVIL Cyan
Military MIL Cyan
Private PRIV Cyan
Runway Length1MIN LEN n/a
Grass Surface GRASS n/a
Airports
Other Surface OTH SFC n/a
Outer Marker OM Cyan
Low Power L PWR Cyan
NDBs
High Power H PWR Cyan
High Level HI LV Cyan
Low Level LO LV Cyan
Terminal TERM Cyan
VORs
TACAN TACAN Cyan
Intersections Enroute ENRT Cyan

MAP OPERATIONS
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 6-5
MAP DATABASE ITEMS
Status bar icons Item Setup Menu
Label Color
SID SIDS Cyan
STAR STARS Cyan
Approach APPR Cyan
Flight Plan Course
Line GPS FPL
GPS/FMS Flight
Plan
Waypoint Symbols2FPL SYM
Active Leg:
Magenta
Other Legs: White
Class B B Green (dashed)
Class C C Green (dotted)
MOA MOA Purple (dotted)
Restricted RESTR Yellow (dashed)
Warning WARN Yellow (dotted)
Airspace
Prohibited3n/a Red (Solid)
Notes:
1. Suppresses display of runways below the specified minimum length
2. Flight plan waypoints can be displayed as facility icons (such as the
VOR icon) or to show as the standard waypoint symbol. Most RS-232
GPS receivers are limited to displaying the waypoint symbol only.
3. Prohibited airspace is always displayed when in range and cannot be
disabled.
Getting Started - Example
The default SN3500 map memories are set up as follows:
S: Empty
1: GPS/FMS flight plan
MAP OPERATIONS
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 6-6
2: Airports, Airspace, and GPS/FMS flight plan
3: VORs and GPS/FMS flight plan
4: Empty
To get started, it is recommended to try some operations on the
ground. Ensure that the GPS/FMS receiver is operating and enter a
flight plan or direct-to in order to establish navigation. If the
GPS/FMS has a simulator mode then that can be used for practice.
Press [MAP] until “1” shows at the top of the map status bar. You
should see the GPS/FMS flight plan on the display. The active leg
and waypoint will be shown in magenta and the other waypoints and
course lines will be shown in white. Use the [ ⇑] or [ ⇓] buttons to
adjust the map range.
Set the map range to 30nm, and press [MAP] so that “2” is
displayed. The display should show the flight plan as before, but
now overlaid with local airports with runways longer than 4,500 feet
in length. Note that the airport icon shows on the map status bar
indicating that airports are being displayed and that on-screen
airports are shown in cyan. The cyan color indicates that the source
of the airport data is coming from the internal database. The flight
plan information comes from the GPS/FMS database.
Lower the map range to 15nm. Notice that as the display zooms in,
airport displays change from an icon to a runway (or multiple
runways). Below 10nm, the runway numbers will also be displayed
to assist in verifying orientation with respect to the airport. During
flight, the display will rotate and update in real time.
Press [MAP] to change to map memory 3. Notice that the airports
are removed and instead, LO and HI VORs are displayed in cyan.
On the map status bar the airport icon is removed and replaced with
the VOR icon.
Pressing [MAP] again will skip memory 4, because it is empty, and it
will jump directly to no map. All the map information will be
removed from the screen. To display the map again, repeat the
cycle of pressing [MAP] to display map memories 1, 2 and 3.
Map Setup
After you are familiar with the displaying map information based on
the default settings, customize the map display to suit your specific

MAP OPERATIONS
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 6-7
needs. In this example, start by pressing [MAP] until “1” shows at
the top of the map status bar.
Press [M] to activate menu mode. Press [MAP] to display the MAP
menu. A pop-up window will appear on the display next to the
[MAP] button as shown below. All settings in map memory 1 are
coped to S (the scratchpad memory), and you can now make non-
permanent changes using the knobs. Changes are actually made
to the scratchpad memory S. To save changes into one of the map
memory locations 1-4, use the COPY function described later in this
chapter.
Figure 6-2 Map setup menu
The following actions occur every time the Map Setup mode is
accessed:
•The currently selected display memory is copied into S.
•S becomes the active memory.
•Map Setup mode is entered and changed can be made to
the map display.
Map Setup mode allows you to change the scratchpad memory S by
adding or deleting items from the map category by category. While
in the map menu, rotate the left knob to highlight an item in the left
column and rotate the right knob to select the available options in
the right column. The middle column will display the current
selection.
As an example, to display Class B airspace the following steps will
be used:
•Press [M] to activate menu mode.
•Press [MAP] to display the MAP menu.
MAP OPERATIONS
82005-PG-D SANDEL SN3500 EHSI PILOT’S GUIDE PAGE 6-8
•Rotate the left knob until “MENU SEL” in the far left column
is highlighted.
•Rotate the right knob until airspace is highlighted as shown
below:
Figure 6-3 Select "AIRSPC"
•Next, rotate the left knob until “B” is highlighted;
•Next, rotate the right knob to toggle Class B airspace to
“ON”.
Figure 6-4 Select "ON"
•Press [M] to exit the menu and return to normal operation.
Class B airspace will now be shown on the map display and
the airspace icon will appear in the Map Status Bar.
Map Memory Settings
Map settings can be retained for future use by storing them into one
of the four memory presets. Individual memory presets can also be
cleared, set to defaults, or copied to the scratch memory. These
functions are all accessed through the map memory menu.
To access the map memory menu: