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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-059
General
The A/T speed warning causes the amber A/T lights on the
autoflight status annunciators (ASA) to flash.
A/T Speed Warning
The A/P activates this warning if the true airspeed is not within
limits when compared to the FMC or MCP selected airspeed.
The A/T speed warning occurs if all of these conditions occur:
* Flaps are more than 0.5 degrees
* A/T MCP speed or A/T FMC speed is engaged
* Airplane is unsquat for more than 5 seconds
* Alpha floor is detected
* Dual monitors are active.
The A/T speed warning also occurs if all of these conditions
occur:
* True airspeed is valid
* True airspeed is 10 kts faster than target speed or true
airspeed is less than target airspeed minus 5 kts
* Airplane is not accelerating to the target speed
* Flaps are greater than 0.5 degrees
* A/T MCP speed or A/T FMC speed is engaged for more than
5 seconds.
The A/T speed warning also shows during the self test of the
warning circuits. During the self test, the FCC does a 2-second
test. It then sends a signal to the other FCC which waits 2
seconds and then does its test. If FCC B does not get the test
signal, but it should, it waits 10 seconds and then does its own
test.
The FCC A sends a warning to the captain ASA. The FCC B
sends a warning to the first officer ASA. If one FCC detects the
warning, it sends the warning to the other FCC. Therefore, both
FCCs send the warning to their ASAs even if only one FCC
detects the warning.
DFCS - FUNCTIONAL DESCRIPTION - A/P AMBER LIGHTS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-060
DFCS - FUNCTIONAL DESCRIPTION - A/P AMBER LIGHTS
DFCS - FUNCTIONAL DESCRIPTION - A/P AMBER LIGHTS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-060
General
The FCC supplies a warning to the DEUs when the airplane is
on an ILS approach and it moves too far away from the ILS path.
The localizer and glideslope scales change color from white to
amber. The pointers flash at a 4 Hz rate.
FCC A supplies the deviation warning when it is in the
command mode. FCC B supplies the warning if it is the only
FCC in the command mode.
Localizer Deviation Warning
The localizer warning occurs if these conditions are present:
* Autopilot is in the approach-on-course mode
* A/P A or A/P B is in command mode
* Localizer mode is active
* APP mode selector switch is set
* Radio altitude is less than 1500 feet for 3 seconds
* Local FCC should supply the warning
* Localizer deviation exceeds 0.293 degree limit.
If the other FCC finds that the warning should be set and it is
not, it sets the warning after 7 seconds.
Glideslope Deviation Warning
The glideslope warning occurs if these conditions are present:
* Autopilot is in the approach-on-course mode
* A/P A or A/P B is in command mode
* Glideslope mode is active
* APP mode selector switch is set
* Radio altitude is less than 1500 feet for 3 seconds
* Local FCC should supply the warning
* Glideslope deviation exceeds 0.35 degree limit below
glideslope.
The warning will not occur if the airplane is below 100 feet. If the
warning occurs and the airplane passes below 100 feet, it will
stay on below 100 feet.
If the other FCC finds that the warning should be set and it is
not, it sets the warning after 7 seconds.
ILS Deviation Warning Test
The FCC does a test to show the crew that if a warning occurs, it
shows on the CDS. The display for the test is the same as the
warning display. FCC A starts the test. It will occur if these
conditions are present:
* A/P A or A/P B is in command mode
* Localizer or glideslope is engaged
* APP mode selector switch is set
* Radio altitude is less than 1500 feet for 3 seconds.
The test lasts for two seconds. A test complete signal goes to
FCC B. After a two-second delay, FCC B starts the test. If FCC B
does not get the test complete signal from FCC A, it starts it own
test 10 seconds after it finds the above conditions.
DFCS - FUNCTIONAL DESCRIPTION - A/P ILS DEVIATION WARNING
EFFECTIVITY
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