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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL
APU CONTROLS - ELECTRONIC CONTROL UNIT -INPUT MONITORING INPUT MONITORING Page 4
INPUT MONITORING page 4 shows this APU data:
-READY TO LOAD (APU ready to load, YES/NO)
-START COMMAND (start command to SCU on, YES/NO)
-LOAD SHED COMMAND (load shed command on, YES/NO)
-IGNITION COMMAND (ignition command on, YES/NO)
-FUEL SOL COMMAND (fuel solenoid valve command on,

YES/NO)
-BLEED SOL COMMAND (bleed air valve command on, YES/NO)
-OVERSPD INDICATOR (OVERSPEED light on, YES/NO)
-FAULT INDICATOR (FAULT light on, YES/NO)
-LOP INDICATOR (LOW OIL PRESSURE light on, YES/NO)
-MAINT INDICATOR (MAINT light on, YES/NO).

January 1, 2004
49-60
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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL
A49-60-00-014.fm

APU CONTROLS - ELECTRONIC CONTROL UNIT - INPUT MONITORING
January 1, 2004
49-60
SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL
APU CONTROLS - ELECTRONIC CONTROL UNIT - OIL QUANTITY

A49-60-00-015.fm
General
The OIL QUANTITY page of APU BITE TEST shows the APU oil quantity. The oil quantity page shows three APU oil levels. These levels
are: 
- FULL 
- ADD 
- LOW. 

There is approximately 171 APU hours at normal oil use rate from full on the oil level sight glass until ADD is displayed on the MCDU. There is approximately 9 hours of APU operation at the maximum oil use rate from full on the oil level sight glass until ADD is displayed on the MCDU.
ADD level first shows when the APU has approximately 60 hours of APU operation at normal oil use rate until the APU MAINT light comes on. At the maximum oil use rate, there is approximately 3 hours of APU operation from ADD until the APU MAINT light comes on.
LOW level first shows when there is approximately 365 hours of APU operation at normal oil use rate until the APU does a protective shutdown caused by low oil pressure. At the maximum oil use rate, there is approximately 19 hours of APU operation from when LOW first shows until the APU does a low oil pressure protective shutdown.
The MCDU gives the APU operation hours that the ADD or LOW message is ACTIVE.
-NOTE: The maximum oil consumption rate is calculated with the APU oil quantity from full on the oil level sight glass to ADD on the MCDU, and the longest flight possible.
The ECU checks the APU oil level when the ECU is energized or when a you begin a start and when the airplane is on the ground. The oil quantity check is done before the APU begins to rotate.
　
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