Inhibited if:
.
ALT HOLD mode is active at selected MCP altitude
.
glideslope captured in APP mode.
Copyright . The Boeing Company. See title page for details.
Automatic Flight -Controls and Indicators 737 Flight Crew Operations Manual
Altitude Intervention (ALT INTV) Switch YD651 - YD655
Allows manual deletion of next FMC altitude constraint via altitude SEL and ALT INTV switch.
Push – (during VNAV climb)
.
lowest FMC altitude constraint below selected MCP altitude is deleted
.
if airplane is currently at an FMC altitude constraint, deletion allows
airplane to resume climb. MCP altitude must be set above current altitude
.
for each press of switch, one deletion occurs
.
if MCP altitude is set above current FMC altitude, FMC cruise altitude
resets to MCP altitude. FMC cruise altitude cannot be decreased using
ALT INTV switch.
Push – (during VNAV cruise)
.
if MCP altitude is set above current FMC cruise altitude, FMC resets
cruise altitude to MCP altitude and initiates a cruise climb
.
if MCP altitude is set below current FMC cruise altitude, an early descent
is initiated. Lower FMC cruise altitude cannot be entered using ALT
INTV switch.
Push – (during VNAV descent)
.
the highest FMC altitude constraint above MCP altitude is deleted
.
if airplane is currently at an FMC altitude constraint, deletion allows
airplane to continue descent. MCP altitude must be set below current
altitude
.
if all FMC altitude constraints are deleted during VNAV path descent, an
automatic transition to a VNAV speed descent is made.
Lateral Navigation
YD651 - YD655
Copyright . The Boeing Company. See title page for details.
4.10.12 September 29, 2005
Automatic Flight -Controls and Indicators 737 Flight Crew Operations Manual
YC411, YC413, YK101 - YK104
YA613 - YC154
COURSE Display
Displays course set by course selector.
Note: Different courses and frequencies on two VHF NAV receivers can cause disagreement between Captain and FO F/D displays and affect A/P operation.
Heading Selector
Rotate –
.
sets heading in HEADING display
.
positions selected heading bugs on the DUs.
HEADING Display
Displays selected heading.
Copyright . The Boeing Company. See title page for details.
Automatic Flight -Controls and Indicators 737 Flight Crew Operations Manual
LNAV Switch
Push –
.
commands AFDS roll to intercept and track the active FMC route
.
annunciates LNAV as roll mode and illuminates LNAV switch light. LNAV Mode
In LNAV mode, the FMC controls AFDS roll to intercept and track active FMC
route. Active route is entered and modified through FMC CDUs and can include
SIDs, STARs, and instrument approaches.
LNAV engagement criteria on the ground:
. origin runway in flight plan
.
active route entered in FMC
.
track of first leg within 5 degrees of runway heading
.
LNAV selected prior to TO/GA. Once TO/GA is engaged, the LNAV
switch light is extinguished until 400 feet AGL
.
LNAV guidance becomes active at 50 feet AGL
YA626, YA686, YA721 - YA803, YC153, YC411, YC413
.
bank angle is limited to 8 degrees from 50 feet to 200 feet and 15
degrees from 200 feet to 400 feet AGL.
YA613, YA687, YA809, YC154, YD651 - YK104
. bank angle is limited to 8 degrees below 200 feet and 30 degrees above 200 feet AGL.
LNAV engagement criteria in flight:
.
active route entered in FMC
.
within 3 NM of active route, LNAV engagement occurs with any airplane
heading
. outside of 3 NM, airplane must:
.
be on intercept course of 90 degrees or less
.
intercept route segment before active waypoint.
LNAV automatically disconnects for following reasons:
.
reaching end of active route
.
reaching a route discontinuity
.
intercepting a selected approach course in VOR LOC or APP modes
(VOR/LOC armed)
.
selecting HDG SEL
.
loss of capture criteria.
Copyright . The Boeing Company. See title page for details.
4.10.14 June 1, 2005
Automatic Flight -Controls and Indicators 737 Flight Crew Operations Manual
VOR Localizer (LOC) Switch
Push –
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