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operation. This nose-down trim is automatically added by the A/P
to reset the trim input made by the A/P at 400 feet RA and at 50
feet RA during the approach.
With pitch mode engaged in TO/GA, ALT ACQ engages when approaching the
selected altitude and ALT HOLD engages at the selected altitude if the stabilizer
position is satisfactory for single A/P operation.
· If stabilizer trim position is not satisfactory for single A/P operation:
· ALT ACQ is inhibited
· A/P disengage lights illuminate steady red
· Pitch remains in TO/GA.
To extinguish A/P disengage lights, disengage A/Ps or select higher altitude
on MCP.
AUTO FLIGHT
Sec. 6.4 Page 24 737
Rev. 11/15/02 #41 Continental Flight Manual
F/D Go-Around
If both A/Ps are not engaged, a manual F/D only go-around is available under
the following conditions:
· Inflight below 2000 feet RA
· Not in takeoff mode.
With the first push of either TO/GA switch:
· A/T (if armed) engages in GA and advances thrust toward the reduced goaround
N1 to produce 1000 to 2000 fpm rate of climb. The A/T Engaged
Mode annunciation on the FMA indicates GA
· Autopilot (if engaged) disengages
· Pitch mode engages in TO/GA and the Pitch Engaged Mode annunciation on
the FMA indicates TO/GA
· F/D pitch commands 15 degrees nose up until reaching programmed rate of
climb. F/D pitch then commands target airspeed for each flap setting based
on maximum takeoff weight calculations
· F/D roll commands approach ground track at time of engagement. The
Roll Engaged Mode annunciation on the FMA is blank
· The IAS/Mach display blanks
· The command airspeed cursor automatically moves to a target airspeed for
the existing flap position based on maximum takeoff 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:
· Below 400 feet RA, both F/D switches must be turned off.
· Above 400 feet RA, select a different pitch or roll mode.
· If the roll mode is changed first:
- F/D roll engages in the selected mode
- The F/D pitch mode remains in TO/GA.
AUTO FLIGHT
737 Sec. 6.4 Page 25
Flight Manual Continental Rev. 11/15/02 #41
· If the pitch mode is changed first:
- The F/D roll mode automatically changes to HDG SEL
- F/D pitch engages in the selected mode.
· The A/T GA mode (if engaged) is terminated when:
- Another pitch mode is selected
- ALT ACQ annunciates engaged.
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:
· F/D roll commands hold current ground track. The roll engaged mode
annunciation on the FMA is blank
· Pitch mode engages in TO/GA and the pitch engaged mode annunciation on
the FMA indicates TO/GA
· The F/D target speed is displayed on IAS/Mach display
· 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.
AUTO FLIGHT
Sec. 6.4 Page 26 737
Rev. 11/15/02 #41 Continental Flight Manual
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.
AUTO FLIGHT
737 Sec. 6.4 Page 27
Flight Manual Continental Rev. 11/15/02 #41
AUTOMATIC FLIGHT GO-AROUND PROFILE
737NG1203
Flap retract
altitude
• Retract flaps
on schedule
Missed Approach
altitude
• Pitch mode
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737 FLIGHT MANUAL 737飞行手册3(75)
