Component Location 101 ALL Component Index Component Location
22-CONTENTS
GUN.1 Page 10 Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
CHAPTER 22 - AUTOFLIGHT
TABLE OF CONTENTS
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Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
Adjustment/Test 501 ALL
Operational Test 501
PANEL - MAINTENANCE CONTROL 22-41-01
DISPLAY
Removal/Installation 401 ALL
ILS DEVIATION MONITOR 22-42-00
Description and Operation 1 ALL General 1 Operation 1
Adjustment/Test 501 ALL ILS Deviation Monitor Test 501
22-CONTENTS
GUN Page 11 Jun 20/97
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757 MAINTENANCE MANUAL
AUTOFLIGHT - GENERAL - DESCRIPTION AND OPERATION
________________________________________________
1. General_______
A. Autoflight Systems (Fig. 1)
(1)
The Autopilot Flight Director System provides automatic control of the ailerons, elevator, stabilizer, and rudder control systems for flying selected flight modes. It provides pitch and roll flight director commands, system warnings, and mode annunciations. Yaw control is provided during the landing rollout.
(2)
The Yaw Damper System controls the rudder to minimize oscillations due to Dutch roll and gust induced side slip. It also provides turn coordination.
(3)
The Mach Trim/Speed Stability System controls horizontal stabilizer position as a function of airspeed, Mach, and elevator loading. Mach trim is disabled when flaps are extended.
(4)
The Thrust Management System provides automatic thrust control of the engines based on selected modes, current conditions, and engine limits.
Autoflight Systems
Figure 1
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ú Dec 15/82
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL
(5)
The Maintenance Monitoring System provides centralized flight fault recording of three systems. It also allows maintenance personnel to perform programmed tests.
(6)
The ILS Deviation Monitor indicates excessive deviations from ILS centerlines during an approach to landing.
B. Autopilot/Flight Director System (AFDS) (Fig. 2)
(1)
The Autopilot (Flight Control) (AMM 22-10-00) consists of the following five autopilot/flight director subsystems.
(2)
Autopilot/Flight Director Power (AMM 22-11-00)
(a) This section covers the general description of ac and dc power distribution to components common to the autopilot/flight director system. It also covers the component details and operation of the three flight control computers, Autoflight Control System (AFCS) mode control panel, autopilot disengage switches, and AFCS go-around switches.
(3)
Autopilot/Flight Director Pitch Channel (AMM 22-12-00)
(a)
AIRPLANES WITH CONTROL WHEEL STEERING; this section covers the general description of the autopilot/flight director pitch channel. It gives the component details and operation of the Autopilot Pitch Control Servos (APCSs); APCS electrohydraulic servovalve and solenoid valves; and elevator control force transducers.
(b)
AIRPLANES WITHOUT CONTROL WHEEL STEERING; this section covers the general description of the autopilot/flight director pitch channel. It gives the component details and operation of the Autopilot Pitch Control Servos (APCSs); APCS electrohydraulic servovalve and solenoid valves.
(4)
Autopilot/Flight Director Roll and Yaw Channel (AMM 22-13-00)
(a) AIRPLANES WITH CONTROL WHEEL STEERING; this section covers the general description of the autopilot/flight director roll and yaw channel. It gives the component details and operation of the Autopilot Rollout Guidance Servos (ARGSs), Autopilot Lateral Control Servos (ALCSs), ARGS and ALCS electrohydraulic servovalve and solenoid valves, and aileron control force transducer.
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