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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The FMC uses data from the airplane sensors and data stored
in the FMC to do the calculations for navigation, performance,
and guidance of the airplane.
Physical Description
The FMC is a rack-mounted chassis assembly in an ARINC 600,
4 MCU box. It weighs less than 22 pounds (10 kilograms). It uses
115V AC, 400 Hz single phase electrical power.
The FMC is cooled with air from the equipment cooling supply
system.
Two green light emitting diodes (LEDs) show through openings
in the front of the unit. The PWR ON LED comes on when the
FMC has power. The FMC VALID LED comes on after power is
on and the unit passes internal tests.
CAUTION: FAILURE TO OBSERVE ELECTROSTATIC
DISCHARGE PRECAUTIONARY PROCEDURES
WHEN TOUCHING, REMOVING, OR INSERTING
PARTS OF ASSEMBLIES, MAY RESULT IN
DEGRADATION OR FAILURE OF THE FMC.
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EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
These are the primary components of the FMC:
* Processor card
* Memory card
* ARINC I/O module
* Power supply.
Processor Card
The primary components of the processor card are the
processor and the application specific integrated circuit (ASIC).
The processor card does these functions:
* Flight plan management
* Navigation and navaid tuning function
* Performance management function
* Guidance function
* Control and display functions.
The processor card also has the memory for the FMC boot and
maintenance programs. The random access memory (RAM) is
used for the scratchpad memory.
The processor card ASIC controls the real time clock and the
system reset and power down logic. It also controls the MAINT
BITE processing.
Memory Card
The memory card contains the memory used for the storage of
the operational flight program (OFP). It also contains these data
bases:
* Navigation data base (NDB)
* Model/Engine data base (MEDB)
* ACARS datalink data base
* Software options data base.
All memory on the memory card is electrically erasable
programmable read only memory (EEPROM).
ARINC I/O Card
The I/O card does all the functions necessary for
communication between the FMC and external systems. The
card is divided into a discrete I/O function and an ARINC 429 I/O
function.
The I/O card also includes an ASIC which acts as the primary
controller for the I/O function. There are 16 ARINC 429 output
drivers, 32 ARINC input translators, 6 discrete outputs and 6
discrete inputs.
An LED on the I/O card comes on when there is a BIT failure.
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Power Supply
The power supply uses 115v ac, single phase from the aircraft
electrical system. It supplies + 5v dc, +15v dc and -15v dc to
internal components of the FMC. Total output power is 40 watts.
There is a 50 microsecond hold up feature for short term power
interrupts.
An LED on the power supply card comes on when the power
supply is valid.
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FMCS - FLIGHT MANAGEMENT COMPUTER - FUNCTIONAL DESCRIPTION
FMCS - FLIGHT MANAGEMENT COMPUTER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
　
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