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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-061
DFCS - FUNCTIONAL DESCRIPTION - A/P ILS DEVIATION WARNING
DFCS - FUNCTIONAL DESCRIPTION - A/P ILS DEVIATION WARNING
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-061
General
The DFCS supplies envelope command limits and annunciation
for these limits:
* Alpha floor
* Gear placard
* Flap placards
* Performance limit
* VMO/MMO.
Alpha Floor
The autopilot (A/P), flight director (F/D), and autothrottle (A/T)
alpha floor limit is the minimum speed available for airspeed
control that will override manual speed selection or FMC
commands. The limit is approximately 1.3 times the stall speed.
Gear Placard
The gear placard reversion limits the maximum speed
command to the gear placard speed and controls to that
speed when the gear is extended.
Flap Placards
The flap placards reversion limits the maximum speed
command to the flap placards speed and controls to that
speed when the flaps are extended.
VMO/MMO
The VMO/MMO reversion supplies a limit to the maximum
speed that the crew can select or the FMCS can control. The
DFCS commands the A/T to a speed mode or engages to a
speed on elevator mode when the airplane reaches the VMO/
MMO speed.
Performance Limit
The DFCS only enables the performance limit reversion when in
VNAV PATH operation. For VNAV PATH descent, the
performance limit reversion causes the mode to change to
level change as a result of an FMC reversion request discrete.
This request is to prevent the airplane from exceeding any
speed constraints.
DFCS - FUNCTIONAL DESCRIPTION - MCP AIRSPEED FLAGS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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DFCS - FUNCTIONAL DESCRIPTION - MCP AIRSPEED FLAGS
DFCS - FUNCTIONAL DESCRIPTION - MCP AIRSPEED FLAGS
EFFECTIVITY
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General
The DFCS supplies an altitude window warning when one of
these conditions occurs:
* The altitude in the FCC memory changes without any change
of the altitude selector
* The altitude in the FCC memory does not agree with the
value in the MCP altitude display for five seconds.
Warning
The warning that the DFCS supplies contains these items:
* The aural warning comes on for 2 seconds and then is off for
8 seconds and continues this sequence
* An amber border appears around the altitude display
* The altitude that shows in the MCP altitude display is 50,000
feet.
This warning continues until it is reset. Reset occurs if the crew
turns the altitude selector or the airplane lands.
The warning does not occur if the glideslope mode is engaged
or the radio altitude is less than 400 feet. However, if the
warning occurs before either of these conditions occur, the
warning stays until it is reset. The warning occurs on the ground
if a continuous altitude selector knob motion signal is received
by the FCC.
When the warning is reset, the altitude display goes to the last
altitude shown plus any changes to the altitude selector that the
FCC detected.
DFCS - FUNCTIONAL DESCRIPTION - MCP ALTITUDE WINDOW WARNING
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-078
DFCS - FUNCTIONAL DESCRIPTION - MCP ALTITUDE WINDOW WARNING
DFCS - FUNCTIONAL DESCRIPTION - MCP ALTITUDE WINDOW WARNING
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-078
General
These are the flight director (F/D) functions that the FCC does:
* F/D roll control
* F/D pitch control
* F/D commands bias out of view (BOV)
* Fault detection.
Changes between F/D modes do not cause unwanted F/D
commands. Changes between the A/P and F/D modes do not
cause unwanted A/P or F/D commands.
F/D Names
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