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Whenever LOC navigation mode arms, a white LOC1 (or LOC2) annunciation is displayed in the armed lateral mode field on both PFDs. When the LOC mode is captured, the armed annunciation is removed, and a green LOC1 (or LOC2) is displayed in the active lateral mode field on both PFDs.
AUTOMATIC FLIGHT CONTROL SYSTEM Description Vol. 2 04.10.23
Oct 05/06
When captured, LOC navigation mode is cleared automatically by:
.
Selection of another lateral mode,
.
Changing the active NAV source, or
.
Loss of localizer signal. LOC mode can also be cleared by pressing the NAV button again.
LOC Navigation Mode Figure 04.10.21
FMS Navigation Mode
In FMS navigation mode, the flight director uses lateral steering commands from the active flight management computer (FMC) to capture and track the desired track to the “TO” waypoint.
AUTOMATIC FLIGHT CONTROL SYSTEM Description Vol. 2 04.10.24
Oct 05/06
When the NAV button is pressed, and the active navigation source is FMS1 or FMS2, the FMS navigation mode arms, and a white LNV1 (or LNV2) annunciation is displayed in the armed lateral mode field on both PFDs. When the FMC capture criteria are met, the armed annunciation is removed, and a green LNV1 (or LNV2) annunciation is displayed in the active lateral mode field on both PFDs.
Depending on the display selected on the PFD, a white track is displayed in PPOS format, or a magenta deviation bar is displayed in ROSE format.
When captured, FMS navigation mode is cleared automatically by selection of another lateral mode, by changing the active NAV source, or by loss of FMS steering validity. FMS navigation mode can also be cleared by pressing the NAV button again.
FMS Navigation Mode Figure 04.10.22
Approach Mode
Approach mode is used to fly a localizer-based (ILS) or FMS-based nonprecision approach. During approach mode, the flight directors operate in dual independent mode.
Approach mode is selected by pressing the APPR button on the FCP. The displayed navigation source will determine which approach submode will be in operation.
ILS-Based Approach
Pushing the APPR button alternately selects and clears approach mode. Approach mode localizer capture functions the same as localizer navigation (NAV) mode. Additionally, glideslope (GS) mode is armed for capture.
AUTOMATIC FLIGHT CONTROL SYSTEM Description Vol. 2 04.10.25
Oct 05/06
Automatic NAV-to-NAV Transfer
When a localizer-based approach is selected from the FMS and the aircraft is within 30 nm of the airport, the localizer frequency is automatically tuned and the course display is set to the appropriate inbound course. The localizer deviation scale and pointer are superimposed in cyan on the PFD HSI, and a cyan LOC1 (or LOC2) navigation source is displayed below the active navigation source (FMS 1 or FMS 2).
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