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APU faults. (SECTION 49-60)
AIRBORNE AUXILIARY POWER - OPERATION - SHUTDOWN
EFFECTIVITY
GUN ALL 49-00-00
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-00-00-007
AIRBORNE AUXILIARY POWER - OPERATION - SHUTDOWN
AIRBORNE AUXILIARY POWER - OPERATION - SHUTDOWN
EFFECTIVITY
GUN ALL 49-00-00
Page 19
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-00-00-007
General
A protective shutdown prevents damage to the APU or the
airplane.
The ECU controls an automatic protective shutdown of the APU.
If the ECU finds a fault, it does a protective shutdown.
There are three different protective shutdown indications in the
flight deck. These are the flight compartment protective
shutdown indications:
* Fault light
* Overspeed light
* Low oil pressure light.
The cause for the shutdown shows on the control display unit
(CDU) on the P9 panel.
Protective Shutdown
These are the conditions that cause a protective shutdown and
a fault light:
* Fuel shutoff valve not in commanded position
* Loss of dc power
* ECU failure
* APU fire
* Inlet door not in command position
* APU inlet overheat
* Loss of both EGT signals
* No speed signal
* No acceleration
* No APU rotation
* No flame
* Generator filter clogged.
* High oil temperature
* Overtemperature
* Reverse flow (load compressor)
* Oil temperature or inlet air temperature sensor failure
* Underspeed.
These are the conditions that cause a protective shutdown and
an overspeed light:
* Fuel control unit solenoid failure
* Loss of overspeed protection
* Overspeed.
Low oil pressure for 20 seconds causes a protective shutdown
and a Low oil pressure light.
When a protective shutdown occurs, the ECU removes
electrical power from these components:
* Fuel solenoid
* Ignitor
* SCU Start signal
* Bleed air valve (BAV)
* Fuel control unit (FCU) signal
* Surge control valve (SCV) signal.
AIRBORNE AUXILIARY POWER - PROTECTIVE SHUTDOWN
EFFECTIVITY
GUN ALL 49-00-00
Page 20
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-00-00-008
AIRBORNE AUXILIARY POWER - PROTECTIVE SHUTDOWN
AIRBORNE AUXILIARY POWER - PROTECTIVE SHUTDOWN
EFFECTIVITY
GUN ALL 49-00-00
Page 21
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-00-00-008
General
The APU has four indication lights and an EGT indicator on the
APU indicator panel. These are the four lights:
* MAINTENANCE - no automatic shutdown (blue)
* LOW OIL PRESSURE - automatic shutdown (amber)
* FAULT - automatic shutdown (amber)
* OVERSPEED - automatic shutdown (amber).
The control display unit (CDU) shows this APU system data:
* Current status
* Fault history
* Maintenance history
* Ident/config
* Input monitoring (real time data)
* Oil quantity.
Training Information Point
You must have 115v ac power from the transfer bus to operate
the CDU. The APU indication lights operate on 28v dc power.
AIRBORNE AUXILIARY POWER - INDICATIONS
EFFECTIVITY
GUN ALL 49-00-00
Page 22
D633A101-GUN Oct 10/2002
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-00-00-009
AIRBORNE AUXILIARY POWER - INDICATIONS
AIRBORNE AUXILIARY POWER - INDICATIONS
EFFECTIVITY
GUN ALL 49-00-00
Page 23
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-00-00-009
APU Access
Open the APU cowl door on the bottom of the aft fuselage to get
access to the APU compartment.
Release three latches on the left side to open the APU cowl
door. The APU access door opens to the right on two hinges.
Connect the hold open rods to keep the door open safely.
APU Oil Servicing
Add oil to the APU fill port on the left side of the accessory gear
case. There are two FULL and ADD marks on the oil sight gage.
The left side of the oil sight gage shows the oil level during APU
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