737-300机组操作手册Flight Crew Operations Manual FCOM 2(36)_航空信息_民用航空_通用航空

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If stabilizer trim position is not satisfactory for single A/P operation:

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ALT ACQ is inhibited

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A/P disengage lights illuminate steady red

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pitch remains in TO/GA.

Note: To extinguish A/P disengage lights, disengage A/Ps or select higher altitude on MCP
F/D Go–Around
If both A/Ps are not engaged, a manual F/D only go–around is available under the following conditions:
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Inflight below 2000 feet RA

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Not in takeoff mode.

With the first push of either TO/GA switch:
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A/T (if armed) engages in GA and advances thrust toward the reduced
go–around N1 to produce 1000 to 2000 fpm rate of climb. The A/T
Engaged Mode annunciation on the FMA indicates GA

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Autopilot (if engaged) disengages

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Pitch mode engages in TO/GA and the Pitch Engaged Mode annunciation
on the FMA indicates TO/GA

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F/D pitch commands 15 degrees nose up until reaching programmed rate
of climb. F/D pitch then commands maneuvering speed for each flap
setting based on maximum weight calculations

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F/D roll commands approach ground track at time of engagement. The
Roll Engaged Mode annunciation on the FMA is blank

Automatic Flight -System Description 737 Operations Manual

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The IAS/Mach display blanks

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The airspeed cursor displays maneuvering speed for existing flap setting
based on maximum weight calculations.

With the second push of either TO/GA switch (if A/T engaged and after A/T reaches reduced go–around thrust:
. The A/T advances to the full go–around N1 limit
TO/GA mode termination from F/D go–around:
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Below 400 feet RA, both F/D switches must be turned off.

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Above 400 feet RA, select a different pitch or roll mode.

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If the roll mode is changed first:

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F/D roll engages in the selected mode

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the F/D pitch mode remains in TO/GA.

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If the pitch mode is changed first:

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the F/D roll mode automatically changes to HDG SEL

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F/D pitch engages in the selected mode.

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The A/T GA mode (if engaged) is terminated when:

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another pitch mode is selected

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ALT ACQ annunciates engaged.

Note: Engaging an A/P in CMD automatically engages the A/P and F/Ds in LVL CHG for pitch and HDG SEL for roll.
Single Engine F/D Go–Around
With a push of either TO/GA switch:
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F/D roll commands hold current ground track. The Roll Engaged Mode
annunciation on the FMA is blank

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Pitch mode engages in TO/GA and the Pitch Engaged Mode annunciation
on the FMA indicates TO/GA

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The F/D target speed is displayed on IAS/Mach display

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The F/D target speed is displayed on the airspeed cursor

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F/D pitch commands 13 degrees nose up. As climb rate increases, F/D
pitch commands maintain a target speed.

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If engine failure occurs prior to go–around engagement, then F/D target speed is the selected MCP speed.

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If engine failure occurs after go–around engagement, then F/D target speed depends on whether ten seconds have elapsed since go–around engagement:

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If prior to ten seconds, the MCP selected approach speed becomes target speed

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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

Automatic Flight -System Description 737 Operations Manual
. 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.
Automatic Flight Go–Around Profile
ALT HLD
MCP SPD
LNAV
CMD
MCP SPD
LNAV
CMD
ALT ACQ
GA
LNAV
CMD
TO/GA