Normal Operating Temperatures for a Main Engine Start Condition
Figure 201B (Sheet 2)

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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////

APU Air Inlet Screen Installation
Figure 202

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2) FIRE PROTECTION DETECTION, APU
 (c)  
P6-3 Load Control Center Assembly
 1) MASTER CAUTION, ANNUNCIATOR, BAT
 2) DIM & TEST
 3) INDICATOR, MASTER DIM BUS, BAT
 4) INDICATOR, MASTER DIM BUS, NO. 1 DC
 5) INDICATOR, MASTER DIM BUS, NO. 2 DC
 6) LANDING GEAR, AIR/GND RELAY & LTS

 (d)  
P6-4 Load Control Center Assembly
 1) CONTROL GENERATOR, APU

 (e)  
P6-5 Load Control Center Assembly
 1) APU CONT
 2) APU Generator Control Unit
 3) BAT BUS AUTO
 4) GEN PWR CONT

 (f)  
P18-5 2nd Observer Panel Assembly
 1) HOT BATTERY BUS
 2) SWITCHED HOT BATTERY BUS
 3) On some airplanes,

 AUX POWER UNIT START

 (g)  
On some airplanes,
 J9 Battery Shield
 1) AUX POWER UNIT START

 S 862-056
 (5)  Make sure these switches on the P5 forward overhead panel are set correctly:
 (a)  
Set the DC selector switch to the BAT position.

 (b)  
Set the AC selector switch to the APU GEN position.

 (c)  
Set the BAT switch to the ON position.

 NOTE: The battery voltage must be greater than 22 volts dc.
____
 (d)  
Set the APU BLEED switch to the OFF position.

 (e)  
Momentarily, set one of the two APU GEN switches to the ON position to close the field relay.

 (f)  
Set the No. 1 AFT FUEL PUMP switch to the ON position.

 NOTE: The No. 1 AFT FUEL PUMP switch is on the P5 forward
____
 overhead panel.

 NOTE: If you must use the fuel boost pumps in the
____ center tank, you must have a maintenance person or observer in the flight compartment to continuously monitor the LOW PRESSSURE lights. Turn the applicable fuel boost pump to the OFF position if the LOW PRESSURE light for the center tank stays on.
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
S 942-171

 WARNING:_______ DO NOT OPERATE THE APU WITH THE LOWER SHROUD REMOVED IF PERSONS
 ARE IN OR DIRECTLY BELOW THE APU COMPARTMENT.  YOU MUST BE A
 MINIMUM OF THREE FEET AWAY FROM THE OUTER EDGE OF THE APU
 COMPARTMENT OPENING TO OPERATE THE APU WITH THE LOWER SHROUD
 REMOVED.  AN APU TURBINE WHEEL SEPARATION DURING OPERATION CAN

 CAUSE SERIOUS INJURY TO PERSONS.
 (6)  APUs WITHOUT ALLIEDSIGNAL SB GTCP85-49-7096; If you must operate the APU with the lower shroud removed, make sure all persons are not in the hazard area (Fig. 202A).
 NOTE: APUs with AlliedSignal SB GTCP85-49-7096 have an external
____ shield around the turbine plenum and have no hazard area.
 S 862-057
 CAUTION: DO NOT TRY AN APU START IF THERE IS ICE AROUND THE HINGED FLAP
　
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