Garmin GNS 530 User Manual download pdf (Page 255)

GNS 530(A) Pilot’s Guide and Reference

190-00181-00 Rev. H

SECTION 15 – FAULT DETECTION

AND EXCLUSION

15-1

SECTION 15: FAULT DETECTION

AND EXCLUSION

NOTE: This section is intended for pilots expe-

rienced with the operation of the GNS 530 and

are familiar with RAIM. For more information

regarding RAIM, see sections 10.3 and 10.4 of

this manual.

FDE is an acronym that stands for Fault Detection and

Exclusion. FDE was incorporated in the Garmin GNS

530 Main and GPS Software version 3.00 and higher.

FDE algorithms, provide a basis for approval per the

requirements for ‘GPS as a Primary Means of Navigation for

Oceanic/Remote Operations’ per FAA Notice N8110.60.

The oceanic ﬂight phase is used by the GNS 530 when the

aircraft is more than 200 nm from the nearest airport. FDE

requires no pilot interaction during ﬂight, but predicting

the capability of the GPS constellation to provide service

during a ﬂight is done by the pilot prior to departure.

15.1 DETECTION AND EXCLUSION

FDE consists of two distinct parts, fault detection

and fault exclusion. The detection function refers to

the capability to detect a satellite failure which can affect

navigation. Upon detection, the exclusion function

excludes one or more failed satellites and prevent them

from being used during navigation. This allows the GPS to

return to normal performance without interruption. The

process is entirely automated and does not require pilot

interaction during ight. On the Satellite Status Page,

the pilot can view information related to FDE operation.

To enhance safety, FDE functionality is provided for

other phases of ight (non-precision approach, terminal,

enroute). The FDE functionality for non-oceanic ﬂight

phases adheres to the same missed alert probability, false

alert probability, and failed exclusion probability specied

by N8110.60.

Figure 15-1 shows satellite number 9 exclusion during

oceanic phase of ﬂight. No message notifying the user

of exclusion appears. In addition to the EPE and DOP

elds, there is the Horizontal Uncertainty Level (HUL)

eld which displays a 99% condence level that the

aircraft position is within a circle with a radius of the value

displayed in the HUL eld.

Oceanic

Mode

Excluded Satellite

(Checkered Pattern)

Horizontal Uncertainty

Level

Figure 15-1 Satellite Status Page

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