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* The autopilot or flight directors are on
* The crew pushes the APP mode selector switch.
The FMA shows G/S in white letters. The APP mode selector
switch light comes on.
Glideslope Capture
Glideslope capture occurs when the airplane is within 0.19
degrees of beam deviation for at least 2 seconds. The pitch
cruise mode is automatically disengaged and further selection
of pitch cruise modes are inhibited. The FMA shows G/S in
green letters.
When both the glideslope and the localizer are in the capture
mode, the APP mode selector switch light goes out. This means
that the crew cannot deselect the approach mode by pushing
the APP mode selector switch.
DFCS - OPERATION - GLIDESLOPE
EFFECTIVITY
SHZ ALL 22-11-00
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DFCS - OPERATION - GLIDESLOPE
DFCS - OPERATION - GLIDESLOPE
EFFECTIVITY
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General
When the crew wants to make an ILS approach, they push the
APP mode selector switch. The single channel approach is
made with only one A/P engaged. There can be one, two or no
F/Ds on.
SHZ 001-003
In the approach sequence, the autopilot captures the localizer
and the glideslope. The autopilot must capture the localizer
before it can capture the glideslope.
SHZ 009-999
In the approach sequence, the autopilot captures the localizer
and the glideslope.
SHZ ALL
After localizer and glideslope capture, the A/P goes into the
approach-on-course mode.
The flight mode annunciator (FMA) shows SINGLE CH in amber
in the DFCS status column from the time of localizer capture
until the crew disengages the autopilot.
Approach On Course
The approach-on-course submode is the same as the localizeron-
course submode with these additions:
* The local radio altimeter must be valid
* The radio altitude is less than 1500 feet
* Glideslope is captured.
Single Channel Flare
Automatic flare is for dual channel approach, however, since it
is part of the A/P design, it can function during single channel
approaches. The flare mode does not annunciate on the FMA in
a single channel approach. The autopilot should be disengaged
manually when the airplane reaches the decision height.
DFCS - OPERATION - SINGLE CHANNEL APPROACH
EFFECTIVITY
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DFCS - OPERATION - SINGLE CHANNEL APPROACH
EFFECTIVITY
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General
The crew can make a dual channel approach. They push the
APP mode selector switch and then engage the second A/P in
CMD. There can be one, two or no F/Ds on. This approach is
similar to the single channel approach except A/P A and A/P B
are engaged.
The FMA shows SINGLE CH in amber in the DFCS status area
from localizer capture until the second A/P engages. This
occurs 10 seconds after the approach-on-course submode is
active. At this time, the FMA also shows FLARE in white letters
in the pitch mode to show the crew that the DFCS is in the dual
approach mode.
Dual Autopilots
The second autopilot must be set to CMD before the airplane
reaches a radio altitude of 800 feet. Below this altitude, the
second autopilot cannot be engaged in CMD.
If FLARE does not show armed before the airplane reaches a
radio altitude of 350 feet, the autopilots disengage.
Flare
The flare mode controls the airplane to a smooth touchdown at
a point past the glideslope antenna. This is a computed
command and is not part of the glideslope mode.
The autopilots start the flare at a radio altitude of 50 feet. The
crew should disengage the autopilot at or after touchdown.
DFCS - OPERATION - DUAL CHANNEL APPROACH
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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