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EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT EFIS ú
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M924 FLIGHT CONTROL COMPUTER A (E1-3)
Stabilizer Trim Warning LightsFigure 12
A
737-300/400/500MAINTENANCE MANUAL
(c) Detector 3. This unit detects an elevator A/P actuator position of greater than 5° from the neutral shift position.
22. DFCS Operation (Fig. 13)______________
A. Engage Interlock Operation (Fig. 13)
(1)
The autopilot is engaged by raising one of the A/P engage switches to CWS or CMD. The switch is locked in the OFF position if certain conditions are not satisfied. When all conditions are met, the solenoid is energized to release the switch. The A/P engage switch is latched in CWS or CMD if hold interlocks are maintained and a disengage discrete is not present.
(2)
The A/P engage switch provides a discrete to energize the arm solenoid in the A/P actuators. After the A/P actuator is synchronized with the surface, the detent solenoid is energized. The A/P aileron force limiter clutch is also energized in CWS or CMD. The A/P warning light circuit is armed when the A/P switch is in the CWS or CMD position.
(3)
A/P Engage Switch Unlock
(a) The interlock to release the A/P engage switch requires that the unlock logic from A/P engage interlock table, Fig. 9, 10 be high. The logic is converted to analog for both the high and low side of the engage solenoid. Energizing the solenoid removes the mechanical stop allowing the switch to be moved to the CWS or CMD position.
(4)
A/P Engage Switch Hold
(a) The A/P engage switch solenoid remains energized if the hold logic is high and the disengage logic is low. The hold logic is shown on the A/P engage interlock table. The A/P general disengage logic is shown on the A/P engage interlock table. The disengage events associated with roll modes are shown on the A/P roll mode disengage table. The disengage events associated with the pitch modes are shown on the A/P pitch mode disengage table.
(5)
A/P Actuator Arm Solenoid
(a) Power to energize the arm solenoid is through contacts of the A/P engage switch. The arm solenoid is energized in either CWS or CMD.
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EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.AIRPLANES WITHOUT EFIS ú
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A/P Engage Interlock Schematic
Figure 13
A
737-300/400/500MAINTENANCE MANUAL
(6)
Aileron Force Limiter Clutch
(a) Power to energize the aileron force limiter clutch is from either A or B A/P engage switch in CWS or CMD. The A/P accessory unit provides a diode network so that either A or B in CWS or CMD energizes the clutch.
(7)
A/P Actuator Detent Solenoid
(a) The logic which energizes the A/P actuator detent solenoid depends on the flight condition. These conditions are discussed in the following paragraphs: 1) A/P Engage Switch First Selected
a) When the A/P engage switch is engaged to CWS or CMD, the arm solenoid is energized. This starts the synchronization of the A/P actuator to the surface. When this synchronization is complete, the detent solenoid is energized. Energizing of the detent solenoid activates the A/P actuator.
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