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To calculate the position error rate, the FMCS divides the difference between the FMCS position and ADIRU position by the total flight time. The FMCS calculates this error rate at the end of each flight. The display is cleared when the airplane is in the air.
The position error rate will be blank if the ADIRU is not in the NAV mode.
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A34-61-00-062.fm
FMCS BITE PAGES - IRS MONITOR

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737-700 MAINTENANCE TRAINING MANUAL

FMCS BITE PAGES - LCD MCDU
GENERAL
To see the CDU MAINT BITE INDEX page, use the LCD CDU prompt (LSK 5R) on the FMCS BITE INDEX page.
The CDU MAINT BITE INDEX page has these MCDU maintenance categories:
-FAULTS
-KEY TEST
-COLOR TEST
-DISPLAY TEST
-CONFIG
-SOFTWARE OPTIONS
-POWER SUPPLY (P/S)
-TEMPERATURE
-LIGHT
-LAMP TEST
-CALIBRATION.

NOTE:  Power supply, temperature, light, lamp test, and calibration are used primarily for bench test of the MCDU.
The EXIT prompt (LSK 6L) selects the FMCS BITE INDEX page.
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737-700 MAINTENANCE TRAINING MANUAL

A34-61-00-077.fm
FMCS BITE PAGES - LCD MCDU

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MCDU BITE PAGES - FAULTS
To see the MCDU faults page, first select FAULTS on line select key (LSK) 1L from the CDU MAINT BITE INDEX page. This selects the CDU BITE DISPLY INDEX page.
CDU BITE DISPLAY INDEX Page
This page shows the fault history for the last ten full power-up cycles. When no faults are recorded during a cycle, the data field is blank.
To see the fault data for a specific cycle, select that line select key. This selects the CDU BITE DISPLAY page for that power up cycle.
Line select key 6L shows the INDEX prompt. This selects the CDU MAINT BITE INDEX page.
CDU BITE DISPLAY Page
This page shows the fault data for a specific cycle. Up to a maximum of five faults are recorded per cycle. The header shows the cycle number.
This data shows for each fault:
-Failed unit
-Failure description
-Fault state
-Failure frequency
-Failure time
-Extended fault code.

The failed unit can show FMC or CDU.
These are the failure descriptions that can show:
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737-700 MAINTENANCE TRAINING MANUAL
-PROCESSOR
-WATCHDOG TIMER
-429 FAULT
-ANNUN FAULT
-LCD
-KEYBOARD
-MEMORY
-R/C TIMER (resistor/capacitor)
-POWER SUPPLY
-LIGHT SENSOR
-ADC (analog to digital converter)
-TEMP SENSOR
-FMC FAULT
-SUB-SYSTEM FAULT
-EDC (error detection and correction logic)
-SOFTWARE FAULT
-ROM (read only memory).

The fault state shows if the fault is steady (S) or intermittent (I). All faults are initially recorded as a steady fault. If the fault later goes away, the indication changes to intermittent.
The failure frequency shows the number of times the fault occurs.
The failure time shows the CDU elapsed time indication when the fault first occurred.
The extended fault code is used by shop personnel only.
Line select key 6L shows the INDEX prompt. This selects the CDU MAINT BITE INDEX page.
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