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the inboard side of the rudder pedals. This lets you disconnect
the coaxial connectors. Then remove the flight management
computer (FMC) control display unit (CDU) to remove the
bracket. The coax couplers are on the bracket.
CDS - FLIGHT COMPARTMENT COMPONENT LOCATION - 2
EFFECTIVITY
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CDS - FLIGHT COMPARTMENT COMPONENT LOCATION - 2
CDS - FLIGHT COMPARTMENT COMPONENT LOCATION - 2
EFFECTIVITY
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Remote Light Sensors
The remote light sensors are on the forward part of the
glareshield. The sensors face forward.
CDS - FLIGHT COMPARTMENT COMPONENT LOCATION - 3
EFFECTIVITY
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CDS - FLIGHT COMPARTMENT COMPONENT LOCATION - 3
CDS - FLIGHT COMPARTMENT COMPONENT LOCATION - 3
EFFECTIVITY
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EE Compartment
The display electronics units (DEUs) are on the E3-1 shelf.
CDS - EE COMPARTMENT COMPONENT LOCATION
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CDS - EE COMPARTMENT COMPONENT LOCATION
CDS - EE COMPARTMENT COMPONENT LOCATION
EFFECTIVITY
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Power
The 28v dc standby bus supplies power to these components:
* Left outboard display unit
* Upper center display unit
* Captain EFIS control panel
* Display electronics unit (DEU) 1.
The 28v dc bus 1 supplies power to the left inboard display unit.
The 28v dc bus 2 supplies power to these components:
* Right outboard display unit
* Right inboard display unit
* Lower center display unit
* First Officer EFIS control panel
* DEU 2.
The 28v dc hot battery bus also supplies power to the DEU 1 and
DEU 2. This power is called the hold up voltage. The DEU uses
the hold up voltage to maintain operation during power
transients. The DEU can lose the primary power for less than
2 seconds and use the hold up voltage. If the DEU loses primary
power for more than 2 seconds, the DEU does a shut down.
After a shut down, it will take 90 seconds to start the DEU
operation.
The DEU also uses the hold up voltage to shut down the DEU
processor. The DEU could have faults in random access
memory or be executing a command when it loses primary
power. When the DEU loses primary power, it uses the hold up
voltage to store any faults in nonvolatile memory and to do an
orderly shut down of the processor. At this time, the DEU can
use the hold up voltage for up to 10 seconds.
CDS - POWER INTERFACES
EFFECTIVITY
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CDS - POWER INTERFACES
CDS - POWER INTERFACES
EFFECTIVITY
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Program Pins
The display electronics units (DEU) and the display units (DU)
have hardware program pins.
DEU Program Pins
These are the two types of program pins for the DEU:
* DEU position
* Airframe type.
DU Program Pins
Each DU has different program pins grounded. The program
pins identify the DU’s location. These are the DU locations:
* Left outboard (LOB)
* Left inboard (LIB)
* Upper center (UC)
* Lower center (LC)
* Right inboard (RIB)
* Right outboard (ROB).
CDS - PROGRAM PINS INTERFACE
　
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