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757
MAINTENANCE MANUAL
WARNING: ACCIDENTAL SPOILER MOVEMENT CAN OCCUR WHEN THESE CIRCUIT
_______ BREAKERS ARE OPENED. INJURY TO PERSONS CAN OCCUR.
(a) Open these circuit breakers on the overhead circuit-breaker panel, P11, and then close them in less than 25 seconds: 1) 11C6, CSEU 1L AC
or
FLT CONT ELEC 1L AC
2) 11C8, CSEU 2L AC
or
FLT CONT ELEC 2L AC
3) 11G17, CSEU 1R AC
or
FLT CONT ELEC 1R AC
4) 11G27, CSEU 2R AC
or
FLT CONT ELEC 2R AC
(b) If a faultball stays set to yellow on a Stabilizer Trim/Elevator Asymmetry Limit Module (SAM) and/or a Yaw Damper Module (YDM) after the above circuit breakers have been opened and closed, push the reset switch on the front of the SAM.
G. Put the Airplane Back to Its Usual Condition
S 095-101
WARNING: STAY AWAY FROM NOSE GEAR WHEELS WHEN YOU REMOVE THE LOCKPIN.
_______ THE NOSE WHEELS CAN MOVE QUICKLY TO THE CENTER POSITION AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1) Do these steps to remove nose gear steering lockpin:
(a)
Make sure the nose gear wheels are in the center position.
(b)
Remove nose gear steering valve lockpin.
(c)
Make sure the towing lever goes back to NORMAL POSITION.
S 085-050
(2)
Do these steps to remove the MCDP remote control unit if it is installed:
(a)
Disconnect the MCDP remote control panel from connector D41101J.
(b)
Install the dust cover on connector D41101J.
(3)
Set the IRS to off if it is not necessary (Ref. 34-21-00).
S 865-055
(4)
On the P5 panel, set the L and R ENG LIMITER switches on the ENG START/RAM AIR TURB control panel to OFF.
S 865-052
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757 MAINTENANCE MANUAL
(5) S 865-073On the P5 panel, set the L and R ELEC ENG CONTROL switches to OFF. On the P5 panel, set the L and R EEC CONTROL switches to OFF.
(6) S 865-177On the P5 panel, set the L and R ELEC ENG CONTROL switches to OFF.
(7) S 865-062Remove the pressure from the left, center, and right hydraulic systems if it is not necessary (Ref. 29-11-00).
(8) S 865-063Remove electrical power if it is not necessary (Ref. 24-22-00).
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757 MAINTENANCE MANUAL
AUTOPILOT/FLIGHT DIRECTOR POWER - DESCRIPTION AND OPERATION
___________________________________________________________
1. General (Fig. 1)_______
A. Power to the Autopilot/Flight Director System (AFDS) is provided by the right and left primary power sources (AC) and the right and left Transformer-Rectifier Units (DC). During Autoland operation, the center AFDS receives power from the standby inverter and the airplane battery.
B. The controls and interlocks of the AFDS consist of the following units:
(1)
One Autoflight Control Systems (AFCS) Mode Control Panel (MCP), located below the glareshield (P55).
(2)
Three Flight Control Computers (FCCs) located in the forward Electrical/Electronics (E/E) compartment in racks E2-1 (L), E2-2 (C), and E2-3 (R).
(3)
One autopilot disengage switch, located on the inboard side of the outboard horn of each control wheel.
(4)
One go-around switch, located on the underside of each thrust lever.
(5)
AFDS mode annunciations displayed on the Electronic Attitude Director Indicator (EADI).
C. AFDS Power and Engage Interlocks (Fig. 2)
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