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22-11-00-098
DFCS - OPERATION - DUAL CHANNEL APPROACH
DFCS - OPERATION - DUAL CHANNEL APPROACH
EFFECTIVITY
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DFCS - OPERATION - DUAL CHANNEL APPROACH
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The pilots can use the A/P go-around (G/A) mode to cancel an
approach.
The A/P go-around mode consists of these conditions:
* A/P go-around arm
* A/P go-around reduced
* A/P go-around maximum
* A/P go-around exit.
A/P Go-Around Arm
A/P go-around arms when these conditions are true:
* The airplane is below 2000 feet radio altitude
* Both autopilots are engaged to CMD and the flare mode is
armed or active.
The A/P G/A is available until touchdown (wheel spin up). If the
crew pushes a TO/GA switch after touchdown, both A/Ps
disengage, but the F/D and A/T G/A do not change.
The FMA and MCP continue to show the approach modes.
A/P Go-Around Reduced
The A/P go-around mode starts when the pilot pushes either
TO/GA switch. TO/GA shows on the FMA as the active mode for
the pitch mode. The roll mode annunciation is blank.
The pitch command is initially 15 degrees pitch up and then it
changes to a speed control that is referenced to the flap
settings. If an engine fails, the pitch command is a speed control
that is referenced to the MCP speed.
The roll command holds the present magnetic track of the
airplane over the ground.
The A/T command is a reduced thrust, but it still maintains a
positive rate of climb.
A/P Go-Around Maximum
After the airplane reaches the reduced A/P go-around setting,
the crew can push the TO/GA switch again. This increases the
thrust setting.
See the authrottle system section for more information.
(SECTION 22-31)
A/P Go-Around Exit
The pitch channel cannot exit from the A/P G/A mode if a single
A/P cannot supply enough elevator control. When the trim
conditions change so that the single A/P can supply enough
elevator movement, pitch A/P G/A mode can be exited.
DFCS - OPERATION - AUTOPILOT GO-AROUND
EFFECTIVITY
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The ALT ACQ mode is enabled for radio altitudes more than 800
feet. The airplane levels at the MCP altitude. If the single
channel A/P does not have enough elevator control, the ALT
ACQ mode is inhibited. The red A/P warning light on the
autoflight status annunciator comes on steady red.
If the airplane levels off at the MCP altitude, the second A/P that
was turned on disengages. The MCP IAS/MACH display shows
the present speed. ALT HOLD and CWS R show on the FMA.
The A/P stays in CWS R until the crew selects another roll
mode.
Another way to exit the A/P G/A mode is to push the HDG SEL
mode selector switch. The A/P exits the roll G/A to HDG SEL,
but the pitch channels remain in A/P pitch G/A. Roll is now in
single channel control, but pitch is still in dual channel control.
The second A/P that was turned on disengages in the roll mode
and turns off its aileron A/P actuator. Both A/Ps still show that
they are in CMD.
When the crew selects a pitch cruise mode such as LVL CHG,
the A/P exits the pitch G/A mode. The crew cannot use pitch
CWS to exit A/P pitch G/A.
DFCS - OPERATION - AUTOPILOT GO-AROUND
EFFECTIVITY
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DFCS - OPERATION - AUTOPILOT GO-AROUND
DFCS - OPERATION - AUTOPILOT GO-AROUND
EFFECTIVITY
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General
The pilots can use the F/D go-around (G/A) mode if they want to
cancel an approach or the airplane enters windshear conditions
while landing.
The F/D go-around mode consists of these conditions:
* F/D go-around active
* F/D go-around exit.
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