737NGAMM1(42)

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than 0.13 degrees/second and the beam deviation is greater
than 0.3 degrees.
8. The autopilots will disengage below 350 feet if in dual mode
and not in flare arm mode.
9. The true airspeed (TAS) must be valid in the CWS heading
hold mode.
10. The lateral acceleration from the ADIRU must be valid or the
autopilot will disengage in certain modes.
11. The magnetic track angle from the ADIRU must be valid or
the autopilot will disengage in certain modes.
DFCS - FUNCTIONAL DESCRIPTION - A/P ROLL MODE DISENGAGE LOGIC TABLE
EFFECTIVITY
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12. If the autopilots are in the dual mode and one disengages,
the other will disengage. This does not occur when one
autopilot disengages because the other goes out of the G/A
pitch mode.
13. If these conditions occur, the autopilot will disengage:
* Radio altimeter is not valid
* GS and LOC are engaged
* A/Ps are not in the flare arm mode.
A 2 second delay allows for short interruptions.
14. If both autopilots are in the flare arm mode, both radio
altimeters must fail before the autopilots disengage.
15. If these conditions occur, the autopilot disengages:
* Autopilots are in the approach mode
* Local AC bus transfers
* Foreign autopilot is in the CMD mode.
16. If the aileron command is more than the allowable limits, the
autopilot disengages.
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EFFECTIVITY
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DFCS - FUNCTIONAL DESCRIPTION - A/P ROLL MODE DISENGAGE LOGIC TABLE
DFCS - FUNCTIONAL DESCRIPTION - A/P ROLL MODE DISENGAGE LOGIC TABLE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The table shows the pitch mode conditions that cause the
autopilot to disengage.
Disengage Conditions
1. This is an unsafe flight condition. When the autopilot is in a
speed mode, the airplane should be climbing but it is not, and it
approaches a stall, the A/P disengages.
2. This is another unsafe flight condition. When the autopilot is
in a speed mode, the airplane should be descending but it is
not, and it approaches the VMO/MMO limit, the A/P disengages.
3. When the autopilot is in the G/S engage mode, it will
disengage if the G/S receiver is not valid and the radio altitude
is above 60 feet. There is a 4.5 second delay to allow for
interrupts.
4. When in the dual (autoland) mode for at least 5 seconds, the
FCC monitors these:
* Autopilot actuator monitor (AAM)
* Surface position monitor (SPM)
* CPU monitor.
5. The autopilots will disengage below 350 feet if in the dual
mode and not in the flare arm mode.
6. If the autopilots are in the dual mode and one disengages, the
other will disengage. This does not occur when one autopilot
disengages because the other goes out of the G/A pitch mode.
7. An autopilot goes out of the G/A pitch mode when the crew
sets a cruise pitch mode. The other autopilot will disengage
when this occurs.
8. If the radio altitude is less than 2000 feet and the A/P is not in
flare arm, it will disengage if the crew pushes a TO/GA switch.
9. An invalid longitudinal acceleration from the ADIRU causes
the autopilot to disengage.
10. An invalid vertical acceleration from the ADIRU causes the
autopilot to disengage.
11. An invalid vertical speed from the ADIRU causes the
autopilot to disengage.
12. An invalid flight path acceleration from the ADIRU when in
the dual mode causes the autopilot to disengage.
13. If these conditions occur, the autopilot will disengage:
* Radio altimeter is not valid
* G/S and LOC are engaged
* A/Ps are not in the flare arm mode.
DFCS - FUNCTIONAL DESCRIPTION - A/P PITCH MODE DISENGAGE LOGIC TABLE
EFFECTIVITY
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