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.
4.10.8 D6-27370-866-EGP
• uncorrected barometric altitude at which ALT HLD switch was pressed
if not at MCP selected altitude
• pitch mode annunciates ALT HOLD
• ALT HLD switch light illuminates.
When in ALT HOLD at selected MCP altitude:
• selecting a new MCP altitude illuminates the ALT HLD switch light and
arms V/S mode
• LVL CHG, V/S, and VNAV climb and descent functions are inhibited
until a new MCP altitude is selected.
ALT HOLD mode is inhibited after G/S capture.
The selected MCP altitude is referenced to:
• Captain’s barometric altimeter setting for A A/P and F/D
• First Officer’s barometric altimeter setting for B A/P and F/D.
Note: After ALT HOLD engages, changes in altimeter barometric settings do not
change the selected altitude reference.
9 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.
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.
September 26, 2013
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