(4)  
C456 MACH TRIM AC (P18-1) 115 volts ac to the A FCC for mach trim.

 E.  115 Volt AC Electronic Bus 2 provides power to:
 (1)  
C1042 SNSR EXC B (P6-2), 115 volts ac to the AFC ACC unit. An autotransformer in the AFC ACC unit provides 26 volts ac to the B FCC and some of the sensors for the B channel.

 (2)  
C1037 MACH TRIM AC (P6-2), 115 volts ac to the B FCC for mach trim.

 F.  28 Volt DC Electronic Bus 1 provides power to:
 (1)  
C1044 A MCP DC (P18-1), 28 volts dc to the MCP.

 (2)  
C1045 A FCC DC (P18-1), 28 volts dc to the A FCC.

 (3)  
C1048 ENG INTLK A (P18-1), 28 volts dc to the engage interlock circuits for the A FCC.

 (4)  
C457 MACH TRIM DC (P18-1), 28 volts dc to the A FCC for the Mach Trim Actuator Brake.

 (5)  
C576 ALTITUDE ALERT AUDIO (P18-2), 28 volts dc to the Aural Alert Unit.

 G.  28 Volt DC Electronic Bus 2
 (1)  
C1046 B FCC (P6-2), 28 volts dc to the B FCC.

 (2)  
C1047 B MCP DC (P6-2), 28 volts dc to the MCP.

 (3)  
C716 ENG INTLK B (P6-2), 28 volts dc to the engage interlock circuits for the B FCC.

 (4)  
C1064 MACH TRIM DC (P6-2), 28 volts dc to the B FCC for the Mach Trim Actuator Brake.

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STABILIZERTRIM SERVO
AFC
ACC UNIT AFC ACCUNIT

B FCC

A FCC B FCC
MCP MCP
A FCC
ENGAGEINTERLOCK ENGAGEINTERLOCK
MACH TRIM DC
A FCC
CAPT FMA,MCP & A FCC F/O FMA, MCPAND B FCC
P18-1 LOAD CONTROL P6-2 LOAD CONTROLCENTER - LEFT CENTER - RIGHT
DFCS Power System Interface SchematicFigure 4
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A 737-300/400/500MAINTENANCE MANUAL
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EXCITATION14V 1800Hz

M1020 ELEV A/PACT A (STA 1156)
EXCITATION2
14V 1800Hz1

M1192 STAB POSSNSR A(STA 1028)
EXCITATION2
14V 1800Hz1
M958 NEUTRAL
SHIFT SNSR
(STA 1156)
EXCITATION2
14V 1800Hz1
M929 ELEV POSSNSR (STA 1156)EXCITATION14V 1800HzM943 AIL A/P ACTA (STA 669)
EXCITATION2
14V 1800Hz1
M937 AIL POSSNSR (STA 669)
EXCITATION2
14V 1800Hz1
M931 SPOILER 2POS SNSR LW(STA 335)EXCITATION14V 1800HzM930 SPOILER 7POS SNSR RW(STA 335)
DFCS A Power Distribution Schematic
Figure 5

A 737-300/400/500MAINTENANCE MANUAL

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A
737-300/400/500MAINTENANCE MANUAL
 H.  28 Volt DC Switched Hot Battery Bus provides power to:
 (1)  
C1049 A/P WARN LT-A (P18-1), 28 volts dc to the A DFCS warning circuits in the MCP and the captain's FMA as well as the A FCC for RAM memory.

 (2)  
C374 A/P WARN LT-B (P6-2), 28 volts dc to the B DFCS warning circuits in the first officer's FMA as well as the B FCC for RAM memory.

 18. Mach Trim System (Fig. 7)________________
 A.  The mach trim system provides nose up commands to the elevator at high mach numbers to compensate for normal tuck tendencies. The output to the mach trim actuator can be provided by FCC A or B.
　
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