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and the F/Ds are on:
* LNAV
* HDG SEL
* VOR LOC.
You can push the HDG SEL or VOR LOC mode selector switch
when an A/P is engaged. You cannot activate LNAV on the
ground when an A/P is engaged.
LNAV
When you push the LNAV mode selector switch, the mode
selector switch light comes on. You can also see LNAV and FD
on the FMA. You do not see any F/D commands on the AI.
HDG SEL and Flight Directors
Turn on the F/Ds and push the HDG SEL mode selector switch.
The FMA annunciator shows HDG SEL and FD. The F/D
integrated cue does not show because there is no valid pitch
mode. Push ALT HLD to activate a pitch mode. The FMA now
also shows ALT HOLD and the F/D cue shows on the AI. Turn
the selected heading to a heading different from the airplane
heading. The F/D command will turn to command a turn to the
selected heading.
HDG SEL and Autopilot
Engage A/P A in CMD and push the HDG SEL mode selector
switch. These annunciations show on the FMA:
* HDG SEL
* CMD
* CWS P.
Turn the selected heading to a heading different from the
airplane heading. The control wheel will turn to turn to the
selected heading.
DFCS - OPERATION - GROUND OPERATIONS - ROLL MODE - LNAV AND HDG SEL
EFFECTIVITY
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DFCS - OPERATION - GROUND OPERATIONS - ROLL MODE - LNAV AND HDG SEL
DFCS - OPERATION - GROUND OPERATIONS - ROLL MODE - LNAV AND HDG SEL
EFFECTIVITY
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VOR LOC
Unless the VOR station is very close to the airport, you will not
receive a valid VOR signal. However, you may be able to
receive the localizer signal.
Flight Director
Turn on the F/Ds and push the VOR LOC mode selector switch.
Tune the navigation control panel to the airport ILS frequency.
The FMA shows VOR LOC and FD in green letters. This occurs if
the ILS receiver receives a valid LOC signal. The F/D command
does not show because there is no valid pitch mode. Push ALT
HLD to activate a valid pitch mode. The FMA now also shows
ALT HOLD and the F/D command shows on the AI. The F/D
command may turn to command a turn to the localizer
centerline.
Autopilot
Engage A/P A in CMD and push the VOR LOC mode selector
switch. These annunciations show on the FMA if the ILS
receiver has a valid localizer signal:
* VOR LOC in green letters (active)
* CMD
* CWS P.
The control wheel may turn to turn the airplane to the localizer
centerline.
If the ILS receiver does not have a valid localizer signal, these
show on the FMA:
* VOR LOC in white letters (armed)
* CMD
* CWS P
* CWS R.
DFCS - OPERATION - GROUND OPERATIONS - ROLL MODE - VOR/LOC
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-108
DFCS - OPERATION - GROUND OPERATIONS - ROLL MODE - VOR/LOC
DFCS - OPERATION - GROUND OPERATIONS - ROLL MODE - VOR/LOC
EFFECTIVITY
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General
You can push these mode selector switches on the MCP and
activate the modes when the airplane is on the ground:
* ALT HLD
* LVL CHG.
You cannot activate the VNAV mode when on the ground. You
can push the V/S mode selector switch on the ground, however,
the mode changes to LVL CHG.
ALT HLD and Flight Directors
When you turn on the F/Ds and push the ALT HLD mode
selector switch the FMA annunciator shows ALT HOLD and FD.
The F/D command does not show because there is no valid roll
mode. Push HDG SEL to activate a roll mode. The FMA now
also shows HDG SEL and the F/D command shows on the AI.
Turn the selected altitude to within 100 feet of the airplanes
altitude. The ALT HLD light on the mode selector switch goes
out.
ALT HLD and Autopilot
When you engage A/P A in CMD and push the ALT HLD mode
selector switch these annunciations show on the FMA:
* ALT HOLD
* CMD
* CWS R.
DFCS - OPERATION - GROUND OPERATIONS - PITCH MODE - ALT HOLD
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