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capture.
WARNING: With the autopilot engaged, if the glideslope is captured
from above, the autopilot may pitch over abruptly and
could cause a hazard to personnel not strapped into their
seats.
At this point the following occur:
1. FMA pitch mode annunciates G/S (green).
2. ALT HOLD and ALTITUDE ALERT deactivate.
3. APP mode switch extinguishes indicating APP mode can only be
deactivated by disengaging the A/P and both F/D’s, detuning the ILS,
manual override to CWS pitch, or pressing TO/GA.
4. N1 limit annunciates GA.
5. A/T maintains selected speed using GA N1 limits.
Sec. 3 Page 200 737
Rev. 11/15/02 #41 Continental Flight Manual
Missed approach altitude should now be selected with the altitude selector.
· Decision Altitude
SINGLE CH / 1 CH autopilot operation is authorized to FAA Category II
minimums. The Pilot Flying disengages the autopilot by pressing the A/P
DISCONNECT switch, located on the wheel, no lower than 50 feet radio
altitude. Disengagement results in a flashing red A/P DISENGAGE light and an
aural warning. A second activation of the switch resets the light and the
horn. The disengage light and aural warning remain active for a minimum
of two seconds. The remaining portion of the approach including flare and
decrab (if necessary) is performed manually.
Flight director guidance is available until reaching 50 feet RA at which
time the F/D bars bias out of view.
· Go-Around (G/A)
F/D and autothrottle G/A is available any time below 2000 feet. No
autopilot G/A is available from a SINGLE CH / 1 CH approach.
To execute the go-around, press either TO/GA switch. The autopilot
automatically disengages and G/A is annunciated. The F/D commands 15
degrees nose up and the A/T advances to achieve a nominal climb rate.
Manually rotate to G/A attitude and retract the flaps to the 15o. Speed
command automatically sets to a precomputed maneuvering speed for the
selected flap position. If full G/A thrust is desired after thrust for the
nominal climb rate has been established, press TO/GA a second time. The
A/T then advances to G/A limit.
Above 400 feet radio altitude with the F/D switches ON, other F/D modes
may be selected. Select HDG SEL or LNAV as appropriate.
Approaching the MCP selected go-around altitude, FMA annunciates ALT
ACQ, and MCP SPD and the A/T reduces to climb limit. If TO/GA was
initiated with F/D switches OFF, F/D TO/GA operation will terminate
approaching MCP altitude and the command bar(s) will retract from view
unless an autopilot is re-engaged or at least one F/D switch is placed ON
prior to ALT ACQ.
The A/P may be re-engaged above 1000’ AGL at pilot’s discretion after the
aircraft is in trim. Normal mode selection is available.
Note: If A/P is re-engaged during TO/GA, AFS engages in LVL CHG
and HDG SEL. A/T will reduce to CLB limit.
737 Sec. 3 Page 201
Flight Manual Continental Rev. 11/15/02 #41
DUAL CHANNEL APPROACH (AUTOLAND) – DUAL AUTOPILOT
When cleared for the approach the APP mode should be armed. At this time the
second autopilot (autopilot A) should be engaged.
Note: The dual autopilot operation provides fail passive control through
landing flare and touchdown or automatic go-around. During fail
passive operation, the flight controls respond to the autopilot
commanding the lesser control movement.
· G/S Capture
G/S capture occurs as described under SINGLE CH / 1 CH operation. The
first channel engaged in COMMAND will capture the glideslope in dual
channel operation.
Approximately ten seconds after glideslope capture and below 1500 feet
RA, the second engaged autopilot pitch channel is engaged and the ILS
Deviation Warning Test is performed. After the ILS Deviation Warning
Test has been completed, the second channel is fully engaged. The SINGLE
CH annunciation disappears and FLARE ARMED is annunciated. The pitch and
roll axes cannot be overridden into CWS during dual autopilot operation.
Manual override of the Autopilots will result in Autopilot disengagement.
If an autopilot fails the test, it will automatically disengage. Additionally, if
a system failure occurs during dual channel operation, the inputs from the
malfunctioning channel will be countered and canceled out by the other
channel and the autopilot will automatically disengage. If weather
minimums require dual channel autoland, immediately initiate a missed
approach. Autoland is not certified with SINGLE CH / 1 CH operation.
· 1000 Feet Above TDZE (Barometric)
Verify second autopilot has been engaged.
· 800 Feet Radio Altitude
The second autopilot must be engaged in COMMAND by this point. If the
　
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