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APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING INFORMATION POINTS - FAULT HISTORY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The MAINTENANCE HISTORY page of APU BITE TEST shows
maintenance messages that are current or have occurred in the
past. The ECU stores up to 99 maintenance messages that are
up to 999 start attempts old.
Each occurrence of a maintenance message shows on a page.
The CDU shows the current page number in the upper right
corner of the display. After this number you see the total
number of pages in MAINTENANCE HISTORY.
If you see > next to CURRENT STATUS the ECU found the
maintenance message on a CURRENT STATUS page. To see
the current status page select the line select key next to
CURRENT STATUS.
The MAINTENANCE HISTORY page gives the following
information about the maintenance messages:
* Flight deck effect
* Maintenance message number
* Description of the maintenance message
* Date maintenance message occurred
* Time maintenance message occurred in Greenwich Mean
Time
* Start attempts old.
These are the possible flight deck effects:
* APU GEN OFF BUS LIGHT
* FAULT LIGHT
* LOW OIL PRESSURE LIGHT
* MAINT LIGHT
* NO BLEED
* NO FLIGHT DECK EFFECT
* OVERSPEED LIGHT
* UNKNOWN FLT DECK EFFECT.
Select the line select key next to OTHER OCCURRENCES to see
a list of other APU start attempts with the same maintenance
message. If there are no other APU start attempts with the same
condition, the ECU shows NO OTHER OCCURRENCES when
you select the OTHER OCCURRENCES line select key.
APU GEN OFF BUS LIGHT
The flight deck effect shows APU GEN OFF BUS LIGHT if the
maintenance message causes the APU GEN OFF BUS light to
come on.
FAULT LIGHT
The flight deck effect shows FAULT light if the maintenance
message causes the FAULT light to come on.
LOW OIL PRESSURE LIGHT
The flight deck effect shows LOW OIL PRESSURE light if the
maintenance message causes the LOW OIL PRESSURE light to
come on.
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MAINT LIGHT
The flight deck effect shows MAINT LIGHT if the maintenance
message causes the MAINT LIGHT to come on.
NO BLEED
The flight deck effect shows NO BLEED if APU bleed is not
available because of a failure sensed by the ECU.
NO FLIGHT DECK EFFECT
The flight deck effect shows NO FLIGT DECK EFFECT if the
maintenance message does not cause a flight deck effect.
OVERSPEED LIGHT
The flight deck effect shows OVERSPEED LIGHT if the
maintenance message causes the OVERSPEED light to come
on.
UNKNOWN FLT DECK EFFECT
The flight deck effect shows UNKNOWN FLT DECK EFFECT if
the maintenance message does not always cause a flight deck
effect.
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APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING INFORMATION POINTS - MAINTENANCE HISTORY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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