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Garmin GNC 420 Instructions Manual

Garmin GNC 420 Instructions Manual

Garmin gnc 420: software guide
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NOTE: These instructions assume the user has experience operating the applicable 400/500 Series Unit and is familiar with the
operation of RAIM. The fi gures in this addendum are derived from the 400/500 Series units. The information in this document
applies to all 400/500 units unless otherwise stated.
FAULT DETECTION AND EXCLUSION (FDE)
The GARMIN 400/500 Series Main and GPS Software version 3.00 and higher (Figure 1) incorporate Fault Detection and
Exclusion (FDE) display interface and control, satisfying the requirements for "GPS as a Primary Means of Navigation for Oceanic/
Remote Operations" per FAA Notice N8110.60.
FDE consists of two distinct parts, fault detection and fault exclusion. The fault detection part detects the presence of an
unacceptably large pseudorange error (and presumably, position error) for a given mode of fl ight. Upon the detection, fault
exclusion follows and excludes the source of the unacceptably large pseudorange error, thereby allowing navigation to return to
normal performance without an interruption in service. To enhance safety, FDE functionality is provided for other phases of fl ight
(non-precision approach, terminal, en route). The FDE functionality for non-oceanic fl ight phases adheres to the same missed alert
probability, false alert probability, and failed exclusion probability specifi ed by N8110.60.
The following 400/500 Series Units are affected:
• GPS 400
• GNC 420/420A
• GNS 430/430A
• GPS 500 (TAWS)
• GNS 530/530A (TAWS)
PRE-DEPARTURE VERIFICATION OF FDE
An FDE prediction must be performed prior to departure for a fl ight plan involving:
• Oceanic/Remote operation where GPS is to be the sole source of navigation per FAA Notice 8110.60
• U.S. Area Navigation (RNAV) routes, Standard Instrument Departures (SIDs), or Standard Terminal Arrival Routes (STARs) if a
NOTAM indicates a GPS satellite (or satellites) is scheduled to be out-of-service, per FAA AC 90-100 "U.S. Terminal and En Route
Area Navigation (RNAV) Operations"
Prior to departure, the operator must use the FDE Prediction Program supplied with the 400/500 Trainer Software to
demonstrate that there are no outages in the capability to navigate on the specifi ed route of fl ight (the FDE Prediction Program
determines whether the GPS constellation is robust enough to provide a navigation solution for the specifi ed route of fl ight).
190-00643-00 REV. A
400/500 SERIES FDE PREDICTION INSTRUCTIONS
Figure 1. Software Version Screen
Page 1

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Summary of Contents for Garmin GNC 420

  • Page 1 FAULT DETECTION AND EXCLUSION (FDE) The GARMIN 400/500 Series Main and GPS Software version 3.00 and higher (Figure 1) incorporate Fault Detection and Exclusion (FDE) display interface and control, satisfying the requirements for “GPS as a Primary Means of Navigation for Oceanic/ Remote Operations”...
  • Page 2 FDE PREDICTION PROGRAM Your 400/500 Series Trainer software includes an FDE Prediction Program to meet the requirements for GPS as a primary means of navigation for oceanic/remote operations (reference FAA Notice 8110.60). The oceanic fl ight phase occurs on your 400/500 Series unit when you are more than 200 nautical miles from the nearest airport.
  • Page 3 To run the FDE Prediction Program: 1. With the 400/500 Series Trainer running, the simulated in the upper left corner (Figure 2). 2. Select ‘Fde Prediction Program’. The FDE Prediction Program window will appear (Figure 3), listing the fl ight plan waypoints and the current time as the departure time.
  • Page 4 6. To deselect satellites from the setup window, click on ‘De-select Satellites’, then click on the box adjacent to any satellite you do not wish to use. A satellite is deselected when a check mark does not appear in the box adjacent to that satellite (Figure 5). Figure 5.
  • Page 5 7. To calculate FDE availability, select the ‘Calculate’ button from the main FDE Prediction Program window (Figure 3). A ‘Calculation is complete’ message will appear when the FDE prediction is complete (Figure 7). 8. The Calculation Results window (Figure 8) appears after clicking the OK button on the ‘Calculation is complete’ message screen. The results can be viewed, or printed for later reference.
  • Page 6 © Copyright 2005 Garmin Ltd. or its subsidiaries c/o Garmin International, Inc. 1200 East 151st Street Olathe, Kansas 66062, U.S.A. Garmin (Europe) Ltd. Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ, U.K. Garmin Corporation No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan...