757
MAINTENANCE MANUAL
FEEL AND CENTERING UNIT ASSEMBLY (NEUTRAL SHIFT TRANSDUCERS)
ACCESS PANEL, 313AL
GREEN
TAPE
(REF)
CENTER ELEVATOR LEFT ELEVATOR
NEUTRAL SHIFT NEUTRAL SHIFT
TRANSDUCER TRANSDUCER
RIGHT ELEVATOR NEUTRAL SHIFT TRANSDUCER
GREEN TAPE (REF)
Feel and Centering Unit Assembly Figure 5
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757 MAINTENANCE MANUAL
VERTICAL SPEED AUTOPILOT
SELECTED ALTITUDE CAPTAIN'S FLIGHT DISPLAY (FT/MIN) DISPLAY (FT) LEFT/CENTER/RIGHT
FLIGHT LEVEL CHANGE
SWITCH/LIGHT
1
GUN 001-050,052-999
GUN 051
Mode Control Panel - Pitch Controls Figure 6
D00785
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MAINTENANCE MANUAL
2) GUN 001-050, 052-999 three CMD ENGAGE switch/lights (L, C, R) provide inputs for command engage logic to dedicated FCCs.
(c)
AIRPLANES WITH CONTROL WHEEL STEERING; Control Wheel Steering switches. 1) Three dedicated CWS ENGAGE switch/lights (L,C,R) establish
the control wheel steering mode of autopilot operation.
(d)
The following MCP controls are associated with the pitch function: 1) VNAV switch/light 2) FLCH switch/light (Flight Level Change) 3) Vert SPD select thumbwheel 4) V/S SPD switch/light 5) ALT Select Knob 6) ALT HOLD switch/light 7) APP switch/light 8) IAS/MACH Control Knob and local MCP/remote FMC speed select
switches
9) IAS/MACH select switch
(2) Pitch Mode Functions (Fig. 7)
(a)
The control inactive mode is the dormant condition of the AFDS when electrical power is on and no A/P or F/D commands are generated. Control loops are synchronized to control surface position for transient-free engagement. Failure detection logic determines the availability of each mode.
(b)
Takeoff Mode (F/D Mode Only)
1) The takeoff mode consists of two submodes: takeoff on-ground, and takeoff in-air. The takeoff on-ground submode provides the F/D with 8 degrees pitch up and wings level roll commands during the ground roll and until 2 seconds after radio altitude of 5 feet. The takeoff in-air submode begins 2 seconds after a radio altitude of 5 feet. The F/D pitch up command is washed out over a 3-second time period and replaced with pitch attitude commands referenced to scheduled airspeed. Airspeed commands are scheduled according to flap position and engine failure. This ensures safe F/D pitch attitude commands until the selected airspeed on the MCP is obtained. The F/D roll command is changed to provide ground track hold.
(c)
Go-Around Mode
1) Go-around mode is selected by pressing the go-around switches on the thrust levers. The go-around mode provides A/P and F/D pitch commands for a safe positive rate of climb using speed scheduling based on flap position. The A/P and F/D roll commands provide ground track hold based on runway heading with crosswind compensation.
(d)
GUN 001-050, 052-999;
Backcourse (B/CRS) Mode
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MAINTENANCE MANUAL
NO FLIGHT DIRECTOR COMMANDS
NO AUTOPILOT SERVO COMMANDS
SYNCHRONIZATION TO ENSURE TRANSIENT ENGAGEMENT INTO SELECTED MODES
UTILIZATION OF FAILURE DETECTION LOGIC TO DETERMINE AVAILABILITY OF MODES FOR ENGAGEMENT
PITCH AXIS CONTROLS ROTATION ATTITUDE OR SPEED AUTOMATICALLY SELECTED SCHEDULE DISPLAY 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 自动飞行 AUTOFLIGHT 1(121)
