1
Revision G
October 14, 1996
SECTION I
1. INTRODUCTION
1.1. SCOPE
This manual provides installation and operating instructions for the TRI NAV Course
Deviation Indicator manufactured by Trimble of Austin, Texas.
1.2. DESCRIPTION
The TRI NAV ECDI is a micro-processor based navigation instrument. It receives standard
navigation and glide slope signals from single or dual navigation receivers and one glide
slope receiver. It processes these signals into a gas discharge display for pilot information.
Electrical output for an autopilot coupler is also provided.
VOR bearings are calculated from the NAV inputs and displayed in numeric form. A
selected OMNI bearing may be compared to the OBS input. The result of this comparison is
a bar type display indicating course deviation.
In the ILS mode localizer signals are received from the NAV receiver and glide slope signals
from the glide slope receiver. These are decoded and the bar display indicates left-right and/
or up-down corrections required to center the aircraft in the approach beam.
1.3. SPECIFICATIONS
Mechanical Specifications
Size: ARINC 3 ATI 4 5/8" long
Weight: 1.25 lbs.
Electrical Specifications
Supply Voltage: 11-32 VDC
Supply Current: 600 mA max at 13.75V
300 mA max at 27.5V
NAV Input Impedance: 1 megohm
NAV Input Level: 50 mV to 10vrms
1.4. PERFORMANCE
Performance
VOR
Accuracy: ±2°
Max. Deflection: 10° = 14 bar deflection
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