FMCS -CONTROL DISPLAY UNIT

Light Sensor
The light sensor on the CDU is one of four light sensor inputs the CDU uses to set the LCD brightness level. The others are the light sensors from the other CDUs and the PDS light sensors.
Manual Brightness Control
The manual brightness control adjusts the brightness level above or below the automatic brightness level set by the CDU. To do this, rotate the manual brightness knob left or right.
Training Information Point
The CDU has no line replaceable parts. The CDU is a line replaceable unit (LRU).
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FMCS -CONTROL DISPLAY UNIT

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FMCS -INSTRUMENT SOURCE SELECT PANELS AND F/O DISPLAY SWITCHING PANEL

General
The FMCS has an interface with these controls:
*
Captain’s NAV source switch on the instrument source select panel (ISSP)

*
First officer’s NAV source switch on the ISSP

*
FMC selector on the first officer’s display switching panel

*
LNAV and VNAV mode switches on the mode control panel (MCP)

Operation -NAV Source Switch
The NAV source switch selects the source of NAV data that shows on the on-side ND and PFD. In the AUTO position, the active FMCF is the source of NAV data for the PFDs and NDs. The on-side CDU supplies map data to the on-side ND when both FMCFs fail and the FMC selector is in the AUTO position. The on-side CDU also supplies map data when the FMC selector is in the left or right FMCF position and the related FMCF fails.
The NAV source switches in the CDU position causes the on-side CDU to supply NAV data to the on-side ND. This position permits the flight and maintenance crews to do a check of the CDU alternate navigation capability. The CDU uses the active FMCF flight plan/map data, reformats it, and sends it to the on-side ND.
Operation -FMC Selector
The FMC selector has these three positions:
*
Left (L)

*
AUTO

*
Right (R).

In the left position, the left FMCF and TMCF are active. If the left FMCF fails, there is no active FMCF.
In the AUTO position, a random selection of the active FMCF and TMCF occurs after power is supplied. If the active FMCF fails, the other FMCF becomes active.
In the right position, the right FMCF and TMCF are active. If the right FMCF fails, there is no active FMCF.
Mode Switches (LNAV and VNAV)
The LNAV mode switch on the MCP sends mode requests to the FMCFs and the CDUs. Normally, the active FMCF uses the mode request to send lateral steering commands to the autopilot flight director system (AFDS) when the airplane is in the air. The CDU sends lateral steering commands to the AFDS when both FMCFs fail.
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FMCS -INSTRUMENT SOURCE SELECT PANELS AND F/O DISPLAY SWITCHING PANEL
The VNAV mode switch on the MCP sends mode requests to the FMCFs. Normally, the active FMCF uses the mode request to send vertical steering commands to the AFDS when the airplane is in the air. The CDU does not calculate VNAV steering commands.
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FMCS -PRIMARY FLIGHT DISPLAY (PFD)

General
The flight management computing function (FMCF) sends speed and compass data to the primary display system to show on the primary flight display (PFD).
Speed Data
When the flight crew completes the FMCF pre-flight, the active FMCF sends this speed data to the primary display system to show on the PFDs:
*
Selected target speed/mach and target cursor

*
High SPD buffet

*
Takeoff safety speed (V2)

*
Rotation speed (VR)

*
Takeoff decision speed (V1)

*
Landing reference speed (VREF)

*
Flap maneuver speed (extend or retract)

*
Minimum speed limit (VMIN).

As part of the pre-flight, the flight crew can enter target speed/ mach into the FMCF. When the vertical navigation (VNAV) mode is active, the FMCF selected target speed/mach shows above the speed tape on the PFD. Also, the selected target speed cursor points to the same target speed on the speed tape. If VNAV is not active, the MCP selected speed/mach shows.
　
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