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second autopilot has not been engaged by 800 feet, it is locked out.
The A/P DISCONNECT warning light on each FMA illuminates steady red if
the stabilizer is out of trim below 800 feet in a dual channel approach.
Check that this light is extinguished at 500 feet and terminate the dual
channel approach if the light is illuminated at any time.
Sec. 3 Page 202 737
Rev. 11/15/02 #41 Continental Flight Manual
· 500 Feet Above TDZE (Barometric)
FLARE must be checked for annunciation. If not annunciated, the dual
approach should be terminated, as beam-tracking accuracy cannot be
guaranteed.
The 500-foot required callout shall be answered by the First Officer with
“FLARE ARMED” if applicable.
· 500 Feet Radio Altitude
The A/P DISCONNECT warning light on each FMA illuminates steady red if
the stabilizer is out of trim below 800 feet in a dual channel approach.
Check that this light is extinguished at 500 feet and terminate the dual
channel approach if the light is illuminated at any time.
· 400 Feet Radio Altitude
The stabilizer is automatically trimmed an additional amount nose up at this
point, and is complete within 20 seconds. Should an A/P fault occur after
the mis-trim takes place, the aircraft will begin to pitch up even before
automatic disconnect occurs. After automatic disconnect, the Pilot Flying
will typically find that a slight push on the column is required to maintain
constant flight path. If the disconnect occurs in flare, it may not be
necessary to take any corrective action as the aircraft will tend to “flare” by
itself.
If FLARE is not armed by approximately 350 RA, both A/Ps automatically
disengage.
The A/T is placed in the rapid acceleration range.
· Flare
The FLARE command is a function of radio altitude and starts at
approximately 50 RA and results in a gradual reduction in flight path angle
to touchdown. The sink rate at touchdown will be 150 feet per minute.
The touchdown will be approximately 450 feet past the glideslope
transmitter.
At 27 feet RA, the A/T annunciates RETARD and closes the thrust levers at a
rate which will reach the closed position in six seconds (approximately at
touchdown).
Approximately two seconds after touchdown the A/T disengages
automatically.
After touchdown, the autopilots should be disconnected.
737 Sec. 3 Page 203
Flight Manual Continental Rev. 11/15/02 #41
· A/P Go-Around Mode
An automatic go-around mode is enabled in dual channel operation when
FLARE is annunciated. Selection of the mode is through the TO/GA switches.
The G/A mode is available after FLARE is annunciated until the A/P senses
touchdown.
Note: If the GA mode is selected after touchdown and prior to A/T
disengagement, the A/Ps will disengage and the A/Ts may
command GA thrust.
· Pitch Go-Around Control
When TO/GA mode is selected, the thrust levers advance toward the reduced
go around N1. The autopilot initially commands a 15 degree nose-up
attitude, and the airspeed cursors display maneuvering speed for the flap
setting. When a programmed rate of climb is established, the A/P controls
pitch to hold airspeed based on the flap maneuvering speed.
The pitch mode cannot be changed from TO/GA unless sufficient nose down
trim has been input to allow for single A/P operation. This nose down trim
is automatically added to reset the trim input that occurred at 400 feet RA
and 50 feet RA. If the pitch mode is the first to be changed from TO/GA, the
selected pitch mode engages in single A/P operation and is controlled by
the A/P which was first in CMD. The second A/P disengages and the roll
mode changes to CWS R.
With pitch 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.
The transition from TO/GA to ALT ACQ is normally successful if the selected
altitude is at least 1,000 feet above the TO/GA engagement altitude. A
higher selected altitude may be required if full GA thrust is used.
If stabilizer trim is not satisfactory for single A/P operation, ALT ACQ is
inhibited and the A/P disengage lights illuminate steady red and pitch
remains in TO/GA. To extinguish the A/P disengage lights, a higher altitude
may be selected if available, or the A/Ps may be disengaged.
· Roll Go-Around Control
When the TO/GA mode is selected, the autopilot will maintain the existing
track.
When above 400 feet radio altitude, other roll and pitch modes may be
selected. If a pitch mode is selected, the autopilot reverts to single channel.
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737 FLIGHT MANUAL 737飞行手册2(40)
