Avidyne IFD540 Manual de Instalação descarregar pdf (Página 174)

5-16 Navigation

TIPS AND TECHNIQUES

Nav Mode Datablock

The Nav Mode datablock as defined in the

Datablock definitions table in Section 4 of this

manual will indicate the current navigation mode

(e.g. OCN, ENRT, TERM, APPR, LPV,

LNAV/VNAV, LNAV+V, LNAV, etc). It is a default

datablock and is an excellent means to know GPS

integrity and mode.

The pilot must monitor the IFD throughout the approach and use

charted minimums appropriate to the approach type. If an

approach type is not indicated by the time the final approach fix

(FAF) is reached, do not descend – the conditions required to fly

the approach have not been met and you must fly the missed

approach procedure.

WAAS approach types in the Nav Mode datablock include:

LNAV (Lateral Navigation)

Provides lateral (horizontal) guidance only, with standard GPS

precision of 0.3 NM full-scale deflection. This is essentially the

same as a non-WAAS GPS approach. It is flown as any other

non-precision approach – observing step down restrictions,

descend to MDA, fly at MDA altitude to the MAP; and execute the

missed approach procedure if appropriate. Since there is no

vertical guidance associated with this type of approach, the IFD

will not transmit any vertical deviation information. The Nav Mode

datablock will display “LNAV” for the approach type.

LNAV + V (Lateral Navigation with Vertical Information)

This mode provides the same lateral navigation as LNAV, but

also typically presents an ILS GS-like presentation on the

external deviation indicator. The GPS draws a 3-D picture of the

approach based on crossing the FAF at the depicted altitude.

Then it follows a glidepath from the published approach, which is

typically a 3 degree angle to the touchdown zone. This type of

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Avidyne IFD540 Manual de Instalação Página 174