.
localizer can be intercepted in HDG SEL, LNAV, or CWS R
YA613 - YA809, YC411 - YK104
.
SINGLE CH annunciates in A/P Status Display after localizer capture
.
for single autopilot approach, SINGLE CH remains annunciated for entire approach
.
for dual autopilot approach, SINGLE CH annunciation extinguishes when second autopilot engages and FLARE armed is annunciated
.
glideslope capture occurs at 2/5 dot below glideslope
.
APP switch light extinguishes after localizer and glideslope capture.
After localizer and glideslope capture, APP mode can be disengaged by:
.
pushing a TO/GA switch
.
disengaging autopilot(s) and turning off both F/D switches
.
retuning the VHF NAV receiver. While engaged in the APP mode:
.
the A autopilot and Captain’s F/D use information from Captain’s Course
Selector and No. 1 VHF NAV receiver
.
the B autopilot and First Officer’s F/D use information from First
Officer’s Course Selector and No. 2 VHF NAV receiver
.
different courses and/or frequencies for the two VHF NAV receivers can
cause disagreement between Captain’s and First Officer’s F/D displays
and affect A/P operation.
Copyright . The Boeing Company. See title page for details.
Automatic Flight -Controls and Indicators 737 Flight Crew Operations Manual
Autopilot / Flight Director
Pushing a CMD or CWS switch engages related A/P in CMD or CWS and illuminates switch lights. A/P can operate in CMD, CWS, or a combination of CMD and CWS.
YC411 -YK104
CMD CMD
CWS CWS
YA613 - YC154
Command Engage (CMD ENGAGE) Switch (A or B):
Push –
.
engages A/P
.
enables all command modes
.
displays CMD in A/P status display
.
pushing an engage switch for second A/P, while not in approach mode, engages second A/P and disengages first A/P
.
enables CWS operation
.
CWS engages if:
.
pitch or roll mode not selected
.
pitch or roll mode deselected
Copyright . The Boeing Company. See title page for details.
4.10.18 June 1, 2005
Automatic Flight -Controls and Indicators 737 Flight Crew Operations Manual
.
pitch or roll mode manually overridden with control column force.
.
CWS engaged displays:
.
CWS P and/or CWS R in A/P status display
.
blank in pitch and/or roll mode FMA
.
when approaching a selected altitude in CWS P, the pitch mode engages
in ALT ACQ and ALT HOLD when reaching selected altitude
.
when approaching a selected radio course in CWS R with VOR/LOC or
approach mode armed, VOR/LOC engages when course is intercepted
.
if pitch is manually overridden while in ALT HOLD and control force is
released within 250 feet of selected altitude, A/P pitch mode engages in
ALT ACQ and returns to selected altitude in ALT HOLD mode.
Note: During F/D only operation while pitch or roll commands are more than 1/2 scale from center, pushing a CMD A or B switch engages the A/P in CWS for pitch and/or roll and the related F/D bar(s) retract.
Control Wheel Steering Engage (CWS ENGAGE) Switch (A or B):
Push –
.
engages A/P
.
engages pitch and roll modes in CWS. Other pitch and roll modes not
enabled
.
displays CWS P and CWS R in A/P status display
.
CMD not displayed in A/P status display
.
F/Ds, if ON, display guidance commands and FD annunciates in A/P
status display. A/P does not follow commands while in CWS
.
A/P pitch and roll controlled by pilot with control wheel pressure
.
when control pressure released, A/P holds existing attitude. If aileron
pressure released with 6 degrees or less bank, the A/P rolls wings level
and holds existing heading. Heading hold feature inhibited:
.
below 1500 feet RA with gear down
.
after LOC capture in APP mode
.
after VOR capture with TAS 250 knots or less.
Autopilot Disengage (DISENGAGE) Bar
Pull down –
.
exposes yellow background
.
disengages both A/Ps
.
prevents A/P engagement.
Lift up –
.
conceals yellow background
.
enables A/P engagement.
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本文链接地址：737NG机组操作手册Flight Crew Operations Manual FCOM 2(83)
