Go–Around
Go–Around (GA) mode is engaged by pushing either TO/GA switch. An A/P go–around requires dual A/P operation and is armed when FLARE armed is annunciated. If both A/Ps are not operating, a manual F/D go–around is available.
With the A/T Arm switch at ARM, the A/T go–around mode is armed:
.
when descending below 2000 feet RA
YA613, YA687, YA809, YC154, YD651 - YK104
.
when above 2000 feet RA with flaps not up or G/S captured
.
with or without the AFDS engaged.
A/P Go–Around
The A/P GA mode requires dual A/P operation and is available after FLARE armed is annunciated and prior to the A/P sensing touchdown.
With the first push of either TO/GA switch:
.
A/T (if armed) engages in GA and the A/T Engaged Mode annunciation
on the FMA indicates GA
.
thrust advances toward the reduced go–around N1 to produce 1000 to
2000 fpm rate of climb
.
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 hold current ground track. 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.
Note: If the go–around mode is selected after touchdown and prior to A/T disengagement, the A/Ps disengage and the A/Ts may command GA thrust.
With the second push of either TO/GA switch after A/T reaches reduced go–around thrust:
.
the A/T advances to the full go–around N1 limit. TO/GA mode termination from A/P go–around:
.
below 400 feet RA, the AFDS remains in the go–around mode unless both
A/Ps and F/Ds are disengaged
.
above 400 feet RA, select a different pitch or roll mode.
.
if the roll mode is changed first:
.
the selected mode engages in single A/P roll operation and is controlled by the A/P which was first in CMD
Copyright . The Boeing Company. See title page for details.
4.20.18 June 1, 2005
Automatic Flight -System Description 737 Flight Crew Operations Manual
. pitch remains in dual A/P control in TO/GA mode.
.
if the pitch mode is changed first:
.
the selected mode engages in single A/P pitch operation and is controlled by the A/P which was first in CMD
.
the second A/P disengages
.
the roll mode engages in CWS R.
.
the A/T GA mode is terminated when:
.
another pitch mode is selected
.
ALT ACQ annunciates engaged.
Note: The pitch mode cannot be changed from TO/GA until sufficient nose–down trim has been input to allow single channel A/P 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.
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:
.
inflight below 2000 feet RA
YA613, YA687, YA809, YC154, YD651 - YK104
.
inflight above 2000 feet RA with flaps not up or G/S captured
.
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
go–around 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
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