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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 
737-300/400/500MAINTENANCE MANUAL
 EADI  Electronic Attitude Director Indicator
 EFIS  Electronic Flight Instrument System
 EHSI  Electronic Horizontal Situation Indicator
 ELEV  Elevator
 ENG  Engage
 EPR or EPRL  Engine Pressure Ratio (Limit)
 ESS  Essential
 FAA  Federal Aviation Administration
 f  Function (of)
 FCC  Flight Control Computer
 FGN  Foreign
 FLT DIR or F/D  Flight Director
 FMA  Flight Mode Annunciator
 FMC  Flight Management Computer
 FMS  Flight Management System
 F/O  First Officer
 FPM  Feet per minute
 FPS  Feet per second
 G or g  Gravity (acceleration units)
 G/A or GA  Go Around
 G/S or GS  Glide Slope
 hr  Radio altitude height
 HDG  Heading
 HSI  Horizontal Situation Indicator
 h°  Vertical rate
 h°°  Vertical acceleration
 IAS  Indicated Airspeed
 IFSAU  Integrated Flight System Accessory Unit
 ILS  Instrument Landing System
 IND  Indicator
 INST  Instrument
 IRS  Inertial Reference System
 IRU  Inertial Reference Unit
 LBS  Lateral Beam Sensor
 LCL  Local
 L NAV  Lateral Navigation
 LOC  Localizer
 LRRA  Low Range Radio Altimeter
 LRU  Line Replaceable Unit
 LVDT  Linear Velocity Differential (Displacement)
 Transducer
 LVL CHG  Level Change

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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