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A
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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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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