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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