737 Flight Crew Operations Manual
Automatic Flight -
Controls and Indicators
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4.10.14 D6-27370-866-EGP
YK981 - YQ456
• localizer must be captured prior to glideslope
• localizer can be intercepted in HDG SEL, LNAV, or CWS R
• 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.
YK981 - YQ456
Note: After localizer or glideslope capture, during a single channel autopilot
approach, reversion to CWS will occur when the pilot manually applies
overriding pitch and /or roll control forces. Approach mode will be reset
(engaged and armed modes blank).
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.
YW273, YW274
Note: After localizer or glideslope capture, during a single channel autopilot
approach, CWS cannot be engaged by manually overriding pitch and/or
roll control forces. Manually overriding pitch and/or roll will cause
autopilot disconnect. At autopilot disconnect, the active Autopilot modes
will remain engaged.
Note: During a dual autopilot approach and after FLARE ARM annunciation,
any attempted manual override of the autopilots may result in an autopilot
disconnect.
September 15, 2016
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