M924 FLIGHT CONTROL COMPUTER A (E1-3)
Engage Interlock Interface SchematicFigure 14 (Sheet 1)
A737-300/400/500MAINTENANCE MANUAL
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
ENGAGE INTLK A
CKT BKR ENGAGE INTLK B CKT BKR

B1791B (J2B)
35 FLAPS UP NO. 1 (BITE)

37 FLAPS UP NO. 1 (BITE)
36 FLAPS UP á LO SPD STS (BITE)
22 STAB TRIM MOTOR SPEED VALID D1795B (J4B)
12 FLAPS UP NO. 2 (BITE)
10 FLAPS UP NO. 2 (BITE)
39 AUTO STAB TRIM ON "NORMAL"
D173 (J3B)
36  MAIN ELECT STAB TRIM "OFF" 
65  FLAP UP 
28  AFL CLUTCH ENGA 
25  AFL CLUTCH ENGA 

D1795B (J4B) 50 AFL AUTHORITY LIMIT VALID M924 FCC A (E1-3)

AIL FORCE
LIMITER 61 FLAPS UP á 115V AC (BITE)
MOTOR (CKT BKR)
64 FLAPS UP á 115V AC (BITE)

A CWS
A CMD B CWS B CMD
A
737-300/400/500MAINTENANCE MANUAL
 (m)  
The stabilizer trim servo is monitored to verify that the STAB TRIM motor speed is valid, the A/P trim cutout switch in the normal position and the main electric trim is not being used. Relay R64 is energized when the main electric trim is activated. A relay within the servomotor transfers the three-phase power to two separate windings for speed control of the servomotor. The relay is controlled by flap switch S245. Another switch (S290) monitors that the relay is in the proper speed position and provides STAB trim motor speed VALID logic to both FCCs.

 (n)  
The A/P trim cutout switch opens the control circuit to the autostab trim motor. The A/P disengages if the switch is not in the NORMAL position.

 (o)  
The main stabilizer trim relay is energized by the stabilizer control switch on the control wheel. The main electric trim motor is used to trim the stabilizer. The autopilot is disengaged when the main electric trim is in use.

 C. A/P Engage Interlock Table (Fig. 15)
 (1)  
The A/P Engage Interlock table displays the functions monitored by the DFCS. These functions are divided into three groups:

 (a)  
A/P unlock interlocks, the logic functions required to unlock the switch.

 (b)  
A/P engage hold interlocks, the logic functions required to hold the switch in CWS or CMD.

 (c)  
A/P disengage interlocks, the logic functions that provide a disengagement of the A/P.

 (2)  
The monitored functions are described by item:

 (a)  
Item 1 - The stab trim cutout switch must be in normal.

 (b)  
Item 2 - Pressing either main electric trim switches energizes the stab trim control relay (R64). This opens the interlock during trimming with the main electric trim.

 (c)  
Item 3 - The A/P stabilizer trim motor is a two-speed motor. The mach trim switch and the flap up switch provide control and interlock for the speed change. Both switches and speed change relay must be in agreement to provide proper logic. A one-second delay allows for transition without disengagement.

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UNLOCK HOLD  DISENGAGE 
1. A/P STAB TRIM CUTOUT SWITCH NORMAL X  X 
2. MAIN ELECTRIC TRIM SWITCHES (NOT PRESSED) X  X 
3. A/P STAB TRIM MOTOR SPEED VALID (10 SEC)  X  X 
4. AILERON FORCE LIMITER AUTHORITY LIMIT VALID (10 SEC)  X  X 
5. AILERON FORCE LIMITER CLUTCH - DISENGAGE X 
6. AILERON FORCE LIMITER CLUTCH - ENGAGE WITHIN 0.5 SEC X 
7. A/P DISENGAGE SWITCH NOT PRESSED  X  X 
8. A/P AILERON HYD PRESSURE SWITCH - NO PRESSURE X 
9. A/P AILERON HYD PRESSURE SWITCH - PRESSURE WITHIN 3.5 SEC AFTER ACT DET SOL ENGAGED X 
10. A/P ELEVATOR HYD PRESSURE SWITCH - NO PRESSURE X 
　
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