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 4.10.9
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.
10 Altitude Intervention (ALT INTV) Switch
Allows manual deletion of next FMC altitude constraint via altitude SEL and ALT
INTV switch.
Push – (during VNAV climb)
• lowest FMC altitude constraint below selected MCP altitude is deleted
• if airplane is currently at an FMC altitude constraint, deletion allows
airplane to resume climb. MCP altitude must be set above current
altitude
• for each press of switch, one deletion occurs
• if MCP altitude is set above current FMC altitude, FMC cruise altitude
resets to MCP altitude. FMC cruise altitude cannot be decreased using
ALT INTV switch.
Push – (during VNAV cruise)
• if MCP altitude is set above current FMC cruise altitude, FMC resets
cruise altitude to MCP altitude and initiates a cruise climb
• if MCP altitude is set below current FMC cruise altitude, an early
descent is initiated. Lower FMC cruise altitude cannot be entered using
ALT INTV switch.
Push – (during VNAV descent)
• the highest FMC altitude constraint above MCP altitude is deleted
• if airplane is currently at an FMC altitude constraint, deletion allows
airplane to continue descent. MCP altitude must be set below current
altitude
• if all FMC altitude constraints are deleted during VNAV path descent,
an automatic transition to a VNAV speed descent is made.
September 26, 2013
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