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737-300/400/500MAINTENANCE MANUAL
 MA Master Light MACH Speed of aircraft relative to the speed of
 sound MAG Magnetic MAN Manual MCP Mode Control Panel MHRS Magnetic heading reference system MSP Mode Select Panel MTA Mach Trim Actuator MTS Mach Trim System
 N1 Engine Fan Speed NAV Navigation NC Normally Closed NO Normally Open NSS Neutral Shift Sensor
 OC On Course OSS Over Station Sensor
 PCU Power Control Unit PSH Preselected Heading
 R/A Radio Altimeter System or Radio Altitude RAM Random Access Memory ROM Read Only Memory RMI Radio Magnetic Indicator
 S/C Speed Command SNSR Sensor SPD Speed SPM Surface Position Monitor STAB Stabilizer STS Speed Trim System
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A  
737-300/400/500MAINTENANCE MANUAL 
 S/C  Speed Command 
 SG  Symbol Generator 
 SNSR  Sensor 
 SPD  Speed 
 SPM  Surface Position Monitor 
 STAB  Stabilizer 
 STS  Speed Trim System 
 TAS  True Air Speed 
 TOGA  Takeoff Go-around 
 TURB  Turbulence 
 VBS  Vertical Beam Sensor 
 V NAV  Vertical Navigation 
 VOR  VHF Omnidirectional Range System 
 V/S  Vertical Speed 
 WARN  Warning 
 XFR  Transfer 
 Y/D  Yaw Damper
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A 737-300/400/500MAINTENANCE MANUAL 
6.  _________________
Logic and Symbols 
A.  The automatic flight control systems use solid-state microelectronics andhigh level digital logic circuits. Circuit functions throughout the description and operation are assigned two values (0, 1) of the binary numbers system. An active circuit is considered a 1 state and an inactive circuit is considered a 0 state. The assignment of a 1 or 0 is based on the following example: ROLL ENGAGE is 1 provided the system is roll engaged, also ROLL ENGAGE is 1 provided the system is not engaged. Circuit symbology is standard. Boolean algebra functions are used and described as follows: 
 
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