737 Flight Crew Operations Manual
Automatic Flight -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 4.10.13
7 Bank Angle Selector
Rotate –
• sets maximum bank angle for AFDS operation in HDG SEL or VOR
modes
• commanded bank angle can be selected at 10, 15, 20, 25, or 30 degrees.
8 Heading Select (HDG SEL) Switch
Push –
• engages HDG SEL command mode
• commands roll to follow selected heading
• annunciates HDG SEL as FMA roll mode and illuminates HDG SEL
switch light.
Heading Select Command Mode
The HDG SEL mode commands roll to turn to and maintain heading shown in
MCP HEADING display:
• initial selection commands turn in shortest direction toward selected
heading bug
• after mode engagement, roll commands are given to turn in same
direction as rotation of heading selector
• bank angle limit is established by bank angle selector
• HDG SEL mode automatically disengages upon capture of selected
radio course in VOR LOC and APP modes (VOR/LOC armed).
9 Approach (APP) Switch
Push –
• illuminates APP switch light
• arms the AFDS for localizer and glideslope capture
• roll mode annunciates VOR/LOC armed
• pitch mode annunciates G/S armed
• enables engagement of both autopilots.
APP Mode
The approach mode arms AFDS to capture and track localizer and glideslope and
can be engaged for dual or single autopilot operation.
One VHF NAV receiver must be tuned to an ILS frequency before approach mode
can be engaged. With one VHF NAV receiver tuned, onside AFDS is enabled for
guidance and operation.
For dual autopilot operation, both VHF NAV receivers must be tuned to the ILS
frequency and both autopilots must be selected in CMD prior to 800 feet RA.
APP mode operation:
September 15, 2016
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