ENSTROM 480B RFM SUPPLEMENT
7-1
Rev. 1
Report No. 28-AC-049
Nov 12/14
CHAPTER 7. SYSTEM DESCRIPTION AND OPERATION
7-1. System Description
1. The Sandel SN3500 is an enhanced electronic
horizontal situation indicator (EHSI) that displays
compass and RMI data on a bright, high-contrast, LED
backlit, LCD screen. The SN3500 combines the functions
of several electronic navigation sources into one unit. All
configurations display navigation information from the
Sandel SG102 AHRS and integrated COM and NAV
(VOR/LOC/GS)
receivers. P/N 4220609-5
and
P/N4220609-7 also display navigation information from a
GPS receiver and marker beacon receiver.
a. Traffic (
TFC) and weather (WX) functions are not
integrated into any of the configurations.
b. P/N 4220609-1 is not configured to a GPS receiver;
therefore, GPS-based navigation features and the
moving map (
MAP) and range (
) functions are not
available.
2. Components particular to the EHSI configuration
include the SN3500 located in the instrument panel
(Figures 7-5 thru 7-7), the SG102 Attitude Heading
Reference System (AHRS) located in the baggage box, and
the MT102 Magnetic Transducer Accessory (MTA) located
in the tailcone. The system also includes inputs from
GPS/NAV (if equipped) and VOR/LOC/GS receivers. The
system block diagram is shown in Figure 7-1.
Figure 7-1. SN3500 System Block Diagram
SN3500
EHSI
SG102
AHRS
(Sandel)
MT102 MTA
(Sandel)
GPS/NAV
Transceiver
VOR/LOC/GS
NAV Receiver
CB
5 A
EHSI
CB
5 A
AHRS
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