AUTOMATIC FLIGHT CONTROL SYSTEM
May 06/2005
Flight Crew Operating Manual
Volume 2
REV 2
CSP 100-6
04-01-09
FLIGHT DIRECTOR LATERAL MODES (Cont)
NAV MODE
This mode is activated by pushing the (NAV) switch on the FGP, and it can be deselected in one of the following ways:
- Pushing NAV switch again
- Selecting another lateral mode
- Changing the frequency of the onside navigation signal
- Changing the NAV source
- Turning off the flight directors with the AP disengaged
- Changing coupled side
Navigation mode generates commands to capture and track the active navigation source, displayed on the PFD. Navigation
mode arms when it is selected, but it cannot capture if the FGC is not receiving valid navigation data.
The following are navigation submodes:
- FMS navigation mode
- VOR navigation mode
- LOC and backcourse mode
Prior to capture, the flight director operates in heading mode. The capture point is a function of closure rate. Navigation
capture clears the heading select mode. A localizer capture also clears the half bank mode.
Dead reckoning operation is executed during the VOR station passage.
When navigation mode is selected, the active lateral mode is annunciated on the PFD by the green HDG (in lateral capture
field) and the armed navigation is annunciated in and a white Nav source identifier (VOR1, VOR2, LOC1, LOC2, FMS1,
FMS2 in the lateral arm field). Navigation mode capture/tracking is annunciated on the PFD with a green message in the
lateral capture field, which identifies the navigation source (VOR1, VOR2, LOC1, LOC2, FMS1, FMS2). Dead reckoning
operation is annunciated on the PFD by a small green DR letters, added to the lateral nav capture annunciation.
The flight director provides a NAV to NAV capture logic that allows automatic transition from FMS navigation to LOC or
back course mode, when FMS is the selected NAV source.
CFO0401002_011
00
225
IAS
M
.54
.50
.42
.38
4200
4
2
1
1
4
AP YD
20
10
20
10
350
16000
350
00
4
3
1
00
00
00
352
00
80
20
2
29.92 IN
.46
.46
.5
1
UTC
° C
11 : 42
SAT
-15
-5
° C
ISA
LNV 1
VS
REV 2
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