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 3)  A third monitor compares the operation of both CPU's during dual channel operation. One CPU generates the roll and pitch commands, the second serves as a model. The command and model CPU's must be within tolerance or both A/P disengages.
Event 7 - When the VHF NAV transfer switch is moved out of the normal position only the instruments are transferred. Even though the switching did not switch the FCC inputs, the act of switching would indicate a fault in one VHF navigation receiver. Therefore, the radio modes (VOR/LOC and APP) on the effected side are inhibited. If both channels are in command both A/P's disengage.Event 8 - After AOC if the associated VHF navigation receiver is not valid or a "Beam Anomaly" occurs the A/P disengages. A beam anomaly is described as a rapid increase in localizer deviation caused by interference with the transmitted localizer signal (for example, another airplane passing through the beam). A 10-second delay allows for short interrupts.Event 9 - The A/P is disengaged below a radio altitude of 350 feet if not in FLARE ARM. FLARE ARM requires that all A/P actuators maintain hydraulic pressure.
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 (3)

(4)

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737-300/400/500MAINTENANCE MANUAL
 (j)  
Event 10 - If a VOR frequency is tuned when in the APP mode, the A/P is disengaged.

 (k)  
Event 11 - The Air Data Computer TAS must be valid in the HDG hold mode or the A/P is disengaged.

 (l)  
Event 12 - The A/P is disengaged if the NAV receiver is in the autotune mode when the APP mode is selected.

 (m)  
Event 13 - The selected IRU (normal on side) lateral acceleration must be valid in the LOC mode or the A/P is disengaged.

 (n)  
Event 14 - The selected IRU MAG track angle (normal on side) must be valid in VOR/LOC or APP modes or the A/P is disengaged.

 (o)  
Event 15 - If both A/Ps in CMD and one A/P disengages the other A/P is disengaged except when an intentional exit is made from A/P GA.

 (p)  
Event 16 - If the radio altimeter valid discretes is lost when both GS and LOC are engaged (prior to monitors active), the A/P is disengaged. A 2-second delay allows for short interrupts.

 (q)  
Event 17 - If both channels are engaged with monitors active, both radio altimeters must fail before the disengage signal is generated.

 (r)  
Event 18 - During the APPROACH mode, if an AC bus transfer has

 been made and the FGN is in CMD the LCL cannot be engaged.The A/P pitch mode disconnect table (Fig. 17) shows the events which cause a selected mode disengage.The following significant pitch disengage events are described:

 (a)  
Event 1 - An unsafe flight condition which disconnects the A/P. This condition specifies that the A/P is in a speed mode and the airplane should be gaining altitude but is not climbing and is approaching a stall.

 (b)  
Event 2 - Another unsafe flight condition. This condition, specifies that the A/P is engaged in a speed mode and should be descending but is not and at the same time is exceeding the VMO/MMO limits.

 (c)  
Event 3 - The GS is monitored from APP OC to a R/A of 60 feet. A delay of 4.5 seconds allows for short interrupts.

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737-300/400/500MAINTENANCE MANUAL
 (d)  Event 4 - Dual channel monitors are activated five seconds
 after both channels are engaged. These monitors are:
 1) The autopilot actuator monitors (AAM) which monitors the
 difference between autopilot command and follow-up (A/P
 LVDT). The AAM trips at 4 degrees with a variable time
 delay of 10 degree-seconds. For example, if the difference
 between A/P command is 4 degrees the time delay would be 10
 divided by 4 or approximately 2.5 seconds.
 2) The surface position monitor (SPM) monitors the difference
　
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