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necessary to deactivate the MAINT light because the MAINT
light comes on when the quantity of oil in the APU gearbox is
satisfactory during an airplane landing operation. Boeing
Service Letter 737-SL-49-058 gives more data on the
deactivation of the MAINT light and low oil quantity indication.
APU CONTROLS - ELECTRONIC CONTROL UNIT - PROTECTION SYSTEM
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-60-00-006
APU CONTROLS - ELECTRONIC CONTROL UNIT - PROTECTION SYSTEM
APU CONTROLS - ELECTRONIC CONTROL UNIT - PROTECTION SYSTEM
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-60-00-006
General
The APU built in test equipment (BITE) data shows on the
control display unit (CDU).
To see the APU BITE TEST page you select the line select key
next to APU on the MAINT BITE INDEX. To return to the MAINT
BITE INDEX, you select the line select key next to INDEX. You
also can select the INIT/REF key from any screen in APU CDU
BITE to return to the MAINT BITE INDEX.
It can take up to 10 seconds for the first APU screen to show on
the CDU. This delay occurs because the ECU does a power-up
test each time it is energized.
APU Display on the CDU
APU data shows on one of these six pages:
* Current status
* Fault history
* Maintenance history
* Ident / config
* Input monitoring
* Oil quantity.
You see the MAIN MENU when you select APU from the MAINT
BITE INDEX if the last APU shutdown was normal and the APU
MAINT light is off.
You see the FAULT HISTORY page in place of the MAIN MENU
if the last APU shutdown was a protective shutdown. FAULT
HISTORY page gives the cause for the protective shutdown.
You see the CURRENT STATUS page in place of the MAIN
MENU if the APU MAINT light is on and the last APU shutdown
was normal. The CURRENT STATUS page gives the cause of
the MAINT light.
APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING INFORMATION POINTS - MAIN MENU
EFFECTIVITY
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49-60-00-009
APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING INFORMATION POINTS - MAIN MENU
APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING INFORMATION POINTS - MAIN MENU
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THIS PAGE IS INTENTIONALLY LEFT BLANK
APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING INFORMATION POINTS - MAIN MENU
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The CURRENT STATUS page of APU CDU BITE shows the
maintenance message the ECU finds for the last APU cycle. The
maintenance message stays in the current status until the ECU
tests the condition again and finds that it is satisfactory. There
are over 200 possible maintenance messages.
One maintenance message shows on each page. The CDU
shows the page number of the maintenance message in the
upper right corner of the display followed by the total number of
pages in CURRENT STATUS.
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
maintenance message, the ECU shows NO OTHER
OCCURRENCES when you select the OTHER OCCURRENCES
line select key.
Select the line select key next to INDEX to go to the APU MAIN
MENU.
The CURRENT STATUS page gives the following information
about the maintenance message:
* Flight deck effect
* Maintenance message number
* Description of the maintenance message
* Instructions for how to verify the repair if the ECU can not test
the condition in the current mode.
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
APU GEN OFF BUS LIGHT
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