757
MAINTENANCE MANUAL

 EPR Engine Pressure Ratio FAA Federal Aviation Administration FCC Flight Control Computer F/D Flight Director FLCH Flight Level Change FMA Flight Mode Annunicator FMC Flight Management Computer FMCS Flight Management Computer System FMS Flight Management System F/O First Officer FPM Feet Per Minute FSAM Flap/Slat Accessory Module FSEU Flap/Slat Electronics Unit GA or G/A Go Around G/S Glideslope
 G.S. Gain Schedule HDG Heading HLD Hold HR Height, Radio HYD Hydraulic IAS Indicated Airspeed ILS Instrument Landing System INTC Intercept I/O Input/Output IRU Inertial Reference Unit IRS Inertial Reference System LNAV Lateral Navigation LOC Localizer LRU Line Replaceable Unit LVDT Linear Variable Differential Transducer M Mach M/ASI Mach/Airspeed Indicator MB Millibars MCDP Maintenance Control Display Panel MCHENG Multi-Channel Engage MCP Mode Control Panel MCU Modular Concept Unit MMO Maximum Operating Mach MMR Multi-Mode Receiver MSL Mean Sea Level NAV Navigation NCD No Computed Data PCA Power Control Actuator
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757 MAINTENANCE MANUAL
 PCU  Power Control Unit
 PDU  Power Drive Unit
 PLA  Power Lever Angle
 PROG  Program
 PROM  Programmable Read Only Memory
 PTU  Power Transfer Unit
 RA  Radio Altitude or Radio Altimeter
 RAT  Ram Air Turbine
 RCVR  Receiver
 RDMI  Radio Distance Magnetic Indicator
 REF  Reference
 RF  Radio Frequency
 RMI  Radio Magnetic Indicator
 RNAV  Area Navigation
 ROM  Read Only Memory
 RTE  Route
 RTG  Rating
 RVDT  Rotary Variable Differential Transducer
 RVR  Runway Visual Range
 SAM Stabilizer Trim and Elevator Asymmetry Limit Module
 SAT  Static Air Temperature
 SCM  Spoiler Control Module
 SG  Symbol Generator
 SID  Standard Instrument Departure
 SOV  Shut-Off Valve
 SPD  Speed
 SPM  Stabilizer Position Module
 SSM  Sign Status Matrix
 STAB  Stabilizer
 STAR  Standard Terminal Arrival Route
 STCM  Stabilizer Trim Control Module
 STLM  Stabilizer Trim Limit Switch and Position Transmitter Module
 TAS  True Airspeed
 TAT  Total Air Temperature
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757 MAINTENANCE MANUAL
 TCA Terminal Control Area TGT Target TLA Throttle Lever Angle TMC Thrust Management Computer TMS Thrust Management System TMSP Thrust Mode Select Panel TO or T/O Takeoff TOC Top of Climb TOD Top of Decent TRK Track TRU Transformer/Rectifier Unit VFR Visual Flight Rules VHF Very High Frequency VMO (Vmo) Maximum Operating Airspeed (Knots) VNAV Vertical Navigation VOR VHF Omnidirectional Range V/S Vertical Speed WEU Warning Electronics Unit XCVR Transceiver XDCR Transducer XFMR Transformer XMTR Transmitter YDM Yaw Damper Module YDS Yaw Damper Servo YSM Yaw Damper/Stabilizer Trim Module
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757 MAINTENANCE MANUAL
 HYDRAULIC AND FLIGHT CONTROLS (AUTOFLIGHT) - DESCRIPTION AND OPERATION
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 1.  General_______
 A.  Autoflight systems drive hydraulically powered servo actuators which in turn drive hydraulic Power Control Actuators (PCAs) connected to the ailerons, elevators, and rudder. The PCAs are driven either manually or from autoflight system servos. Secondary flight controls such as spoilers, flaps, slats, and stabilizer are also discussed. The following pages provide a general discussion of airplane Hydraulic Power (Chapter 29) and Flight Controls (Chapter 27).
　
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