-Start attempts old. These are the possible flight deck effects: -FAULT LIGHT -LOW OIL PRESSURE LIGHT
-OVERSPEED LIGHT. 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.
OVERSPEED LIGHT The flight deck effect shows OVERSPEED LIGHT if the maintenance message causes the OVERSPEED light to come on.
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APU CONTROLS - ELECTRONIC CONTROL UNIT -FAULT HISTORY
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APU CONTROLS - ELECTRONIC CONTROL UNIT -MAINTENANCE HISTORY
A49-60-00-012.fm
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 MCDU 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: 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 
- FAULT LIGHT 
- LOW OIL PRESSURE LIGHT 
- MAINT LIGHT 

- NO BLEED 
- NO FLIGHT DECK EFFECT 
- OVERSPEED LIGHT 
- UNKNOWN FLT DECK EFFECT. 

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.
　
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