Garmin 400, 500 manual Fault Detection And Exclusion Fde, Pre-Departureverification Of Fde

400/500 SERIES FDE PREDICTION INSTRUCTIONS

NOTE: These instructions assume the user has experience operating the applicable 400/500 Series Unit and is familiar with the operation of RAIM. The figures 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 flight. 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 flight (non-precision approach, terminal, en route). The FDE functionality for non-oceanic flight phases adheres to the same missed alert probability, false alert probability, and failed exclusion probability specified 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)

Figure 1. Software Version Screen

PRE-DEPARTURE VERIFICATION OF FDE

An FDE prediction must be performed prior to departure for a flight 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 specified route of flight (the FDE Prediction Program determines whether the GPS constellation is robust enough to provide a navigation solution for the specified route of flight).

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