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If AC power is available, turn the aft number 1 fuel boost pump on. This gives pressurized fuel to the APU. Pressurized fuel makes the APU start better.
The ECU controls the APU start sequence.
When you move the APU switch to START and release it, the switch moves back to the ON position. The ECU goes through the start sequence. The time for the start sequence is about 60 seconds.
The low oil pressure light comes on and stays on for approximately 30 seconds. The APU exhaust gas temperature (EGT) increases.
See the APU chapter for more information on the specific operating range of the APU. (AMM PART I 49)
737-600/700/800/900 TRAINING MANUAL
The APU GEN OFF BUS light comes on when the APU is ready to supply electrical power.
The maintenance, fault, and overspeed lights normally are off. If these lights come on, refer the problem to a qualified APU technician.
Shutdown
The ECU also controls the APU shutdown. Normally, to shutdown the APU, you put the APU switch to OFF. This starts a cool down cycle. The cool down cycle time is approximately 60 seconds. When the cool down cycle is complete, the APU shuts down.
The ECU can also automatically shutdown the APU. If the ECU finds a shutdown condition, the ECU does a protective shutdown. A protective shutdown causes one of these indications on the APU indicator panel to come on:
-Fault light
-Overspeed light
-Low oil pressure light.
Training Information Point
The BAT DISCHARGE light on the electrical meters, battery, and galley power module comes on when the APU start uses DC power. The BAT DISCHARGE light does not come on when the APU uses AC power to start.
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737-600/700/800/900 TRAINING MANUAL
737 GENERAL -- APU OPERATION
The APU fuel shutoff valve and air inlet door will close for a normal or protective shutdown. Wait 40 seconds after the EGT goes below 300 C for the inlet door and fuel shutoff valve to close before you move the battery switch to the OFF position.
Do not use the battery switch or fire switches to begin a normal APU shutdown. The 60-second cool down is required to prevent coke in the turbine bearing and fuel nozzles.
If the fuel shutoff valve does not close in the required time, the APU FAULT light comes on and stays on until you start the APU again or you put the battery switch in the OFF position.
See the engines controls section for more information on APU faults.(AMM PART I 49-60)
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737-600/700/800/900 TRAINING MANUAL

00-00-00-496 Rev 1 09/08/1997
LOW OIL OVERMAINT FAULTPRESSURE SPEED
10
EGT
8
6
0 4
CX100
2
APU INDICATOR PANELAPU
OFF
TR3STBY
PWR TEST
OFF
ON
BAT
START
ON
DC
BATTERY
APUSWITCH
SWITCH
START OPERATION
-BATTERY SWITCH ON
 -APU SWITCH TO THE START POSITION & RELEASE TO ON
-LOW OIL PRESSURE LIGHT COMES ON, THEN GOES OFF IN APPROXIMATELY 30 SECONDS
-EGT INCREASES
 -MAINT, FAULT AND OVERSPEED LIGHTS OFF
-APU GEN OFF BUS LIGHT ON WHEN APU IS READY TO SUPPLY POWER

APU GEN
OFF BUSb

APU GEN OFF BUS LIGHT (ON P5-4)
NORMAL SHUTDOWN
-APU SWITCH TO THE OFF POSITION
 -60-SECOND COOL DOWN
 -APU SHUTS DOWN
737 GENERAL - APU OPERATION
PROTECTIVE SHUTDOWN
 -ECU SHUTS DOWN APU IF
 DETECTS SHUTDOWN
CONDITION

-LOW OIL PRESSURE, FAULT, OR SPEED LIGHT ON
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737-600/700/800/900 TRAINING MANUAL 737 GENERAL -- EQUIPMENT COOLING General
To prevent damage to equipment, you must make sure that cooling air is on while electrical power is on. The controls and indications for the equipment cooling system are on the equipment cooling panel.
Operation
The equipment cooling panel has an equipment cooling SUPPLY switch and an equipment cooling EXHAUST switch. Each switch has two positions:
-NORMAL
-ALTERNATE.
You put the switch in one of these positions to operate the normal or the alternate fan.
Indication
The equipment cooling supply or exhaust OFF light and a master caution light comes on when a failure occurs.
The equipment cooling system has low flow detectors to give a warning when there is not sufficient cooling airflow. On the ground the ground crew call horn comes on when low flow is found. This occurs to prevent an overheat condition.

00-00-00-027 Rev 1 10/07/1998
- 86 -
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737-600/700/800/900 TRAINING MANUAL

00-00-00-027 Rev 1 03/11/1997
EQUIP COOLING P5 FORWARD OVERHEAD PANEL
SUPPLY EXHAUST
NORM

ALTN
OFF OFF
a a

EMER EXIT LIGHTS EQUIPMENT COOLING PANEL 737 GENERAL - EQUIPMENT COOLING
　
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