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D Vertical Speed (V/S) Switch
Push –
· Arms or engages V/S command mode
· Commands pitch to hold vertical speed
· Engages A/T in speed mode to hold selected airspeed
· Annunciates V/S pitch mode and illuminates V/S switch light.
AUTO FLIGHT
Sec. 6.4 Page 42 737
Rev. 11/15/02 #41 Continental Flight Manual
Vertical Speed Command Mode
The V/S mode commands pitch to hold selected vertical speed and engages
A/T in SPEED mode to hold selected airspeed. V/S mode has both an armed
and an engaged state.
Engaged –
· Annunciates V/S pitch mode
· Vertical speed display changes from blank to present vertical speed
· Desired vertical speeds can be selected with vertical speed
thumbwheel.
V/S becomes armed if:
· Pitch mode is ALT HLD at selected MCP altitude and
· New MCP altitude is selected (more than 100 feet from current
altitude).
With V/S armed, V/S mode is engaged by moving vertical speed
thumbwheel.
V/S mode automatically engages if ALT ACQ mode is engaged and a new
MCP altitude is selected which is more than 100 feet different from
previously selected altitude.
· Vertical speeds can be selected which command flight toward or away
from selected altitude.
Inhibited if:
· ALT HOLD mode is active at selected MCP altitude
· Glideslope captured in APP mode.
AUTO FLIGHT
737 Sec. 6.4 Page 43
Flight Manual Continental Rev. 11/15/02 #41
Lateral Navigation
< COURSE Display
Displays course set by course selector.
Different courses and frequencies on two VHF NAV receivers can cause
disagreement between Captain and First Officer F/D displays and affect
A/P operation.
= Heading Selector
Rotate –
· Sets heading in HEADING display
· Positions selected heading bugs on the HSI.
> HEADING Display
Displays selected heading.
? LNAV Switch
Push –
· Commands AFDS roll to intercept and track the active FMC route
· Annunciates LNAV as roll mode and illuminates LNAV switch light.
AUTO FLIGHT
Sec. 6.4 Page 44 737
Rev. 11/15/02 #41 Continental Flight Manual
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 on the ROUTE page
· 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
- Bank angle is limited to 8 degrees from 50 feet to 200 feet and 15
degrees from 200 feet to 400 feet AGL.
LNAV engagement criteria in flight:
· Active route entered in FMC
· Within 3 NM of active route, LNAV engagement occurs with any
aircraft heading
· Outside of 3 NM, aircraft 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.
@ VOR Localizer (LOC) Switch
Push –
· Commands AFDS roll to capture and track selected VOR or LOC
course
· Annunciates VOR/LOC armed or engaged as roll mode and illuminates
VOR LOC switch light.
AUTO FLIGHT
737 Sec. 6.4 Page 45
Flight Manual Continental Rev. 11/15/02 #41
VOR LOC Mode
Pushing the VOR LOC switch selects VOR mode if a VOR frequency is tuned
or selects LOC mode if a localizer frequency is tuned.
The VOR mode provides roll commands to track selected VOR course.
The LOC mode provides roll commands to track selected localizer course
along inbound front course bearing.
The selected course can be intercepted while engaged in:
· LNAV
· HDG SEL
· CWS R if an autopilot is engaged in CMD.
The capture point is variable and depends on intercept angle and closure
rate. Localizer capture occurs not later than 1/2 dot deviation. Course
capture is indicated when VOR/LOC annunciation changes from armed to
engaged.
While engaged in VOR or LOC modes:
· A autopilot and Captain F/D use information from Captain course
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737 FLIGHT MANUAL 737飞行手册3(80)
