ON/OFF DISCRETE CAPT VHF NAV CONTROL PANEL
F/O VHF NAV CONTROL PANEL
ENG-1, ENG-2 ANTI-ICE SWITCHES (P5)
WING ANTI-ICE SWITCH (P5)
LEFT AND RIGHT PACK VALVE RLYS
GROUND SENSE RLY
BLEED AIR ISOLATION VALVE

FMC-A/T PMC SWITCHES ENG-1, ENG-2 (E11) LWR 41

FMCS Discrete Inputs - Simplified Schematic
Figure 4

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DATA
INPUT

DATA
INPUT

DFDAU

FMC - Discrete Outputs
Figure 5

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R476 FMCS TRANSFER RELAY NO.2

FMCS Digital Outputs Figure 6 (Sheet 1)
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FMC-L-02

FMC-L-05

FMC-L-05
FMC-L-02

RELAY NO. 1 (E1-3)

AIRPLANES WITH ACARS
FMCS Digital Outputs Figure 6 (Sheet 2)
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 B.

C.
D.
E.
A
737-300/400/500MAINTENANCE MANUAL
FMCS Transfer Relays
 (1)  
The FMCS transfer relays select the FMC that is used to output data to the systems that interface with the FMCS. The relays are located on the E1 shelf in the main equipment center, and are controlled by the FMC SOURCE SELECT SWITCH. This switch can be found on the aft overhead equipment panel. The switch is a three-position switch which allows the pilot to select either FMC as the primary FMC, or to use both FMCs in a dual configuration.

Control Display Unit (CDU)

 (1)  
The CDU includes a display and keyboard that allows the operator to interface with the FMC. The CDU displays airplane initialization, reference, flight planning, and performance data. The CDU keyboard enables the operator to enter parameter values to support processing of flight management functions.

 (2)  
The CDU also provides a means of initiating, controlling, and displaying the operation and status of BITE, for the flight management system.

 (3)  
The CDU assembly contains the following components: a keyboard lightplate assembly, chassis, high and low voltage power supplies, circuit cards, and a Cathode Ray Tube (CRT).

 (4)  
The front panel on the CDU contains the keyboard switches with integral lighting. The CDU keys are shaped to help set apart their respective functions. The numeric keys are circular in shape, while the alphabetical keys are square. The line select and function keys are rectangular in form.

 (5)  
The CDU chassis contains the high and low voltage power supplies. The chassis consists of multiple plates that form a rigid EMI-tight enclosure.

 (6)  
The CRT subassembly contains a five-inch cathode ray tube, yoke, high contrast filter, and an EMI shield. The cathode ray tube is flat faced; a glass optical filter is bonded to the front of the tube.

Digital - Analog Adapter (DAA)

 (1)  
　
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