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 3.  AFCS Mode Control Panel (Figure 2)
_______________________
 A.  Autopilot (A/P) and flight director (F/D) engage requests are generated at the Mode Control Panel (MCP) and are supplied to the Flight Control Computers (FCCs). Once accepted, the requests can result in the arming and engaging of the A/P servos.
 B.  Mode requests for both A/P and F/D are generated at the MCP and transmitted by digital data bus to the FCCs. A mode is selected by pressing the appropriate switch/light. The light on the mode switch/light illuminates when the MCP receives the mode operational response from the FCC.
 (1)  
The MCP contains two separate internal processors with a common display element. This prevents a single failure from causing a total loss of the MCP function. Each channel receives inputs from panel switches and encoders and processes the data independently.

 (2)  
Pressing any one of the CMD switch/lights (L, C, or R) generates an engage request signal. The L and C switch/light requests are processed by channel A; the R requests by channel B. Illumination of the dot-bar matrices on the switch/lights is controlled by status logic generated in the appropriate FCC. The matrix lights when the request is accepted.

 (3)  
Reference values for altitude, heading, vertical speed, and airspeed or mach number are entered using the related select knob or thumbwheel on the MCP. These reference values are optically encoded and supplied to both the A and B channels and routed to the appropriate MCP window for display. The reference values are also sent to the FCC, and FMC.

 (4)  
The V/S and HDG displays can be initialized/synchronized by the FCCs or manually set by the crew.

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747-400
MAINTENANCE MANUAL

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REFERENCE  ITEM  FUNCTION 
1  SWITCH AUTOTHROTTLE (A/T ARM/OFF)  A TWO-POSITION SWITCH USED TO ARM THE AUTOTHROTTLE SYSTEM. 
2  SELECT (SEL) SWITCH  SPEED OR FMC TARGET ALTITUDE. A PUSHBUTTON SWITCH USED TO CHANGE THE IAS/MACH INDICATOR BETWEEN AIRSPEED DISPLAY AND MACH DISPLAY. THE INITIAL VALUE DISPLAYED, WHEN THE BUTTON IS PRESSED, WILL BE CURRENT 
3  INDICATOR AIRSPEED (IAS/MACH)  SPEED, IN 1 KNOT INCREMENTS, FROM 100 TO 399 KNOTS, OR MACH NUMBER, IN .01 MACH INCREMENTS, FROM .400 TO .950. A MECHANICAL MAGNETIC WHEEL INDICATOR USED TO DISPLAY AIR-
4  SWITCH VERTICAL NAVIGATION (VNAV)  CONTROL VERTICAL PATH. MANAGEMENT COMPUTER TO THE FLIGHT CONTROL COMPUTER TO A PUSHBUTTON SWITCH/LIGHT USED TO COUPLE THE FLIGHT 
5  LATERAL NAVIGATION (LNAV) SWITCH  MANAGEMENT COMPUTER TO THE FLIGHT CONTROL COMPUTER TO A PUSHBUTTON SWITCH/LIGHT USED TO COUPLE THE FLIGHT CONTROL THE LATERAL PATH. 
6  HEADING (HDG) INDICATOR  SELECTED HEADING, IN 1` INCREMENTS, FROM 000` TO 359`. A MECHANICAL MAGNETIC WHEEL INDICATOR USED TO DISPLAY THE 

(CONT)
MCP Component Details
Figure 2 (Sheet 1)

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A
747-400
MAINTENANCE MANUAL

REFERENCE  ITEM  FUNCTION 
7  INDICATOR VERTICAL SPEED (VERT SPD)  +6000 TO -8000 FEET PER MINUTE. VERTICAL SPEED, IN 100-FEET-PER-MINUTE INCREMENTS, FROM A MAGNETIC WHEEL INDICATOR USED TO DISPLAY THE COMMAND 
8  ALTITUDE (ALT) INDICATOR  ALTITUDE, IN 100-FOOT INCREMENTS, FROM 0 TO 50000 FEET. A MAGNETIC WHEEL INDICATOR USED TO DISPLAY THE SELECTED 
9  ALTITUDE SELECT CONTROL  A ROTARY KNOB USED TO CHANGE THE DESIRED ALTITUDE ON THE TURNED COUNTERCLOCKWISE. TROL IS TURNED CLOCKWISE AND DECREASE AS THE CONTROL IS ALTITUDE INDICATOR. THE ALTITUDE WILL INCREASE AS THE CON-
10  LOCALIZER (LOC) SWITCH  COMMAND MODE. A PUSHBUTTON SWITCH/LIGHT USED TO ENGAGE THE LOCALIZER 
11  SWITCHES AUTOPILOT COMMAND (CMD)  RIGHT FLIGHT CONTROL COMPUTER IN THE AUTOPILOT COMMAND MODE. PUSHBUTTON SWITCHES USED TO ENGAGE THE LEFT, CENTER, OR 
　
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