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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-60-00-014
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).
APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING INFORMATION POINTS - INPUT MONITORING
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-60-00-014
APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING INFORMATION POINTS - INPUT MONITORING
APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING INFORMATION POINTS - INPUT MONITORING
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-60-00-014
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
CDU. There is approximately 9 hours of APU operation at the
maximum oil consumption rate from full on the oil level sight
glass until ADD is displayed on the CDU.
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 consumption 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 consumption rate, there is approximately 19
hours of APU operation from when LOW first shows until the
APU does a low oil pressure protective shutdown.
NOTE: The low oil quantity (LOQ) maintenance light will come
on when there is enough oil in the APU for 30-50 hours
of operation at the maximum oil consumption rate
before the APU will shutdown because of low oil
pressure.
The CDU 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 CDU, 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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EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-60-00-015
APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING INFORMATION POINTS - OIL QUANTITY
APU CONTROLS - ELECTRONIC CONTROL UNIT - TRAINING INFORMATION POINTS - OIL QUANTITY
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-60-00-015
Purpose
A dual-coil speed sensor measures APU shaft speed and
supplies two independent speed signals to the ECU.
Location
The speed sensor is on the right side of the compressor case.
Functional Description
The speed sensor is a variable reluctance motion sensor. The
sensor sends a signal with a frequency proportional to engine
speed. The ECU selects the higher of the two signals for control
and display functions.
Control
The ECU uses engine speed to control these functions:
* Ignition system control
* Starter system control
* Fuel system control
* APU speed control
* Overspeed automatic shutdown protection
* No-acceleration automatic shutdown protection.
* APU ready-to-load (RTL).
Indications
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