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12  ON/OFF SWITCH (COPILOTS) FLIGHT DIRECTOR (F/D)  BARS. TOR SYSTEM AND ACTIVATE THE COPILOTS FLIGHT DIRECTOR COMMAND A TWO-POSITION TOGGLE SWITCH USED TO ENGAGE THE FLIGHT DIREC-
13  (DISENGAGE) AUTOPILOT DISENGAGE BAR  MENT OF THE AUTOPILOT. (NORMALLY LEFT IN THE UP POSITION.) A TOGGLE SWITCH ASSEMBLY USED TO PROVIDE POSITIVE DISENGAGE-
14  APPROACH (APP) SWITCH  MODE. A PUSHBUTTON SWITCH/LIGHT USED TO ENGAGE THE APPROACH 
15  ALTITUDE HOLD (HOLD) SWITCH  CONTROL COMPUTER TO HOLD THE AIRCRAFT AT THE CURRENT A PUSHBUTTON SWITCH/LIGHT USED TO COMMAND THE FLIGHT ALTITUDE. 
16  VERTICAL SPEED (V/S) SWITCH  IS ALREADY ENGAGED. MODE. UPDATES VERT SPD INDICATOR WHEN PUSHED, IF THIS MODE A PUSHBUTTON SWITCH/LIGHT USED TO ENGAGE THE VERTICAL SPEED 
17  WHEEL (DN - UP) VERTICAL SPEED ADJUSTMENT  UPWARD. NEGATIVE VERTICAL SPEED IS COMMANDED BY ROTATING THE WHEEL SPEED IS COMMANDED BY ROTATING THE WHEEL DOWNWARD. A MORE ON THE VERTICAL SPEED INDICATOR. A MORE POSITIVE VERTICAL A MECHANICAL ROTATING THUMBWHEEL USED TO CHANGE THE DISPLAY 
18  HEADING HOLD (HOLD) SWITCH  COMPUTER TO HOLD THE AIRCRAFT ON THE CURRENT HEADING. A PUSHBUTTON SWITCH/LIGHT USED TO COMMAND THE FLIGHT CONTROL 

(CONT)
MCP Component Details
Figure 2 (Sheet 2)

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A
747-400
MAINTENANCE MANUAL

REFERENCE  ITEM  FUNCTION 
19  HEADING CONTROLS  CLOCKWISE. THE CONTROL ALSO CONTAINS A PUSHBUTTON WHICH IS USED FOR MANUAL SELECTION OF THE HEADING SELECT MODE. CLOCKWISE, AND DECREASE AS THE KNOB IS TURNED COUNTER-THE HEADING DISPLAY WILL INCREASE AS THE KNOB IS TURNED SELECT MODE. THE INNER KNOB CHANGES THE HEADING DISPLAY. 10,15,20, OR 25 DEGREES) TO BE USED DURING THE HEADING THE OUTER KNOB SELECTS THE BANK-ANGLE LIMIT (AUTOMATIC, 5, TWO CONCENTRIC KNOBS USED TO CONTROL BANK ANGLE AND HEADING. 
20  SWITCH FLIGHT LEVEL CHANGE (FL CH)  A PUSHBUTTON SWITCH/LIGHT USED TO COMMAND ENGAGEMENT OF AIRSPEED CONTROL BY THE FLIGHT CONTROL COMPUTER, AND VERTICAL PATH CONTROL BY THE FLIGHT MANAGEMENT COMPUTER. 
21  SPEED SELECT/SYNC CONTROL  COUNTERCLOCKWISE. THE CONTROL ALSO CONTAINS A PUSHBUTTON KNOB IS TURNED CLOCKWISE AND DECREASES AS THE KNOB IS TURNED IAS/MACH INDICATOR. THE DISPLAYED SPEED INCREASES AS THE USED TO CHANGE THE SPEED (IN KNOTS OR MACH NUMBER) ON THE SWITCH. UNLESS THE SPEED MODE, FLIGHT LEVEL CHANGE MODE, THE TAKEOFF MODE (PITCH AXIS) OR THE GO-AROUND MODE (PITCH AXIS) IS ENGAGE, THE FIRST PRESS OF THE PUSHBUTTON WILL CAUSE THE IAS/MACH INDICATOR TO BLANK AND THE SECOND PRESS WILL CAUSE THE CURRENT SPEED TO BE DISPLAYED. WHEN THE INDICATOR IS BLANK, CONTROL OF THE AIRSPEED BUGS ON THE MASI IS FROM THE FLIGHT MANAGEMENT COMPUTERS. 
22  SPEED (SPD) SWITCH  ON THE IAS/MACH INDICATOR. A PUSHBUTTON SWITCH/LIGHT USED TO ENGAGE AND COMMAND THE FLIGHT MANAGEMENT COMPUTER TO FLY TO THE SPEED SELECTED 
23 THRUST (THR) SWITCH  PROFILE. A PUSHBUTTON SWITCH/LIGHT USED TO ENGAGE AND COMMAND THE FLIGHT MANAGEMENT COMPUTER TO FLY TO A THRUST-RATED 
24  FLIGHT DIRECTOR (F/D) ON/OFF SWITCH (PILOT'S)  SYSTEM AND ACTIVATE THE PILOT'S FLIGHT DIRECTOR COMMAND BARS. A TWO-POSITION SWITCH USED TO ENGAGE THE FLIGHT DIRECTOR 

MCP Component Details
Figure 2 (Sheet 3)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (5)  
Pressing the vertical speed (V/S) mode select switch/light initiates a V/S mode discrete request. This discrete generates a manual ON signal which arms the vertical speed mode if the FCC is engaged in CMD or the F/D is on and the airplane is airborne.

 (a)  The dot-bar matrix annunciator in the V/S switch/light illuminates when the MCP receives V/S OPER from the FCCs. V/S OPER is also sent to the EIUs to display V/S PFDs.

 (6)  
Pressing the HDG HOLD mode select switch/light initiates a heading hold mode request discrete. This discrete generates a manual ON signal which arms the heading hold mode if the FCC is engaged in CMD or the F/D is on and the airplane is airborne.
　
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