737 Flight Crew Operations Manual
Automatic Flight -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
4.20.22 D6-27370-866-EGP
• the F/D target speed is displayed on the airspeed cursor
• F/D pitch commands 13 degrees nose up. As climb rate increases, F/D
pitch commands maintain a target speed.
• if engine failure occurs prior to go–around engagement, then F/D
target speed is the selected MCP speed.
• if engine failure occurs after go–around engagement, then F/D target
speed depends on whether ten seconds have elapsed since go–around
engagement:
• if prior to ten seconds, the MCP selected approach speed becomes
target speed
• if after ten seconds and the airspeed at engine failure is within five
knots of the go–around engagement speed, the airspeed that
existed at go–around engagement becomes target speed
• if after ten seconds and the airspeed at engine failure is more than
five knots above go–around engagement speed, then the current
airspeed becomes target speed.
Note: The target speed is never less than V2 speed based on flap
position unless in windshear conditions.
F/D commanded acceleration cannot occur until a higher speed is selected on the
MCP IAS/Mach display.
Go-Around Roll Mode – LNAV in Lieu of Track Hold
When multiple arm modes such as LNAV and VOR/LOC are set, they will appear
on the FMA side by side in white.
When a missed approach exists in the flight plan and the FCCs are capable of
entering go-around, LNAV arm will be annunciated on the FMA. The roll
go-around track hold mode will automatically transition to LNAV during a missed
approach.
During autoland operations with FLARE arm or FLARE engage displayed, if
TO/GA is pressed with LNAV arm annunciated on the FMA, then LNAV will
engage when the airplane is above 400 feet. Below that altitude the roll mode will
be track hold.
During an approach without FLARE arm or FLARE engage displayed, if TO/GA
is pressed with LNAV arm annunciated on the FMA, the flight director LNAV
mode will engage when the airplane is above 50 feet. Below that altitude the mode
will be track hold.
Single channel autopilot minimum engage and use heights are not affected. This
feature is recommended to support RNP RNAV operations for terminal
procedures requiring definitive course guidance.
September 15, 2016
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