APU Control Thermostat Adjustment
Figure 501

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT THE ETC ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(b)  Open this circuit breaker and attach a DO-NOT-CLOSE tag: 1) E3-3 Electrical Shelf, APU Control Unit
 S 015-003
 (2)  Open the APU cowl door:
 (a)  
Open the latches for the APU cowl door.

 (b)  
Open the APU cowl door.

 (c)  
Connect the door support rods.

 S 015-004
 CAUTION:_______BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD DRAIN LINES CAN OCCUR.
 (3)  Remove the lower shroud:
 (a)  
Hold the lower shroud and open the shroud latches.

 (b)  
Remove the lower shroud.

 S 485-007
 (4)  Install the test thermocouple:
 (a)  
Remove the EGT thermocouple (AMM 49-71-21/401).

 (b)  
Install the test thermocouple from the thermocouple calibration kit.

 (c)  
Connect the test thermocouple cables to the calibration kit.

 S 755-008
 (5)  Do a check of the set point for the thermostat temperature control and the control time for the rate of the load control valve:
 (a)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker: 1) E3-3 Electrical Shelf, APU Control Unit

 (b)  
Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.

 (c)  
Start and operate the APU (AMM 49-11-00/201). 1) Let the engine become stable with no load applied.

 (d)  
Look at the FREQ meter on the P5 forward overhead panel.

 NOTE: With no load applied to the APU, the FREQ meter must
____
 become stable at 405-410 CPS.

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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
(e)  Put an electrical load of 100 amps on the APU electrical
 generator.
 (f)  Set the ISOLATION VALVE switch, on the P5 forward overhead
 panel, to the OPEN position.
 (g)  Set the APU BLEED switch, on the P5 forward overhead panel, to
 the ON position.
 (h)  Set the switches for the cabin temperature controls to the AUTO
 position.
 (i)  Set the L PACK and R PACK switches, on the P5 forward overhead
 panel, to the AUTO position.
 (j)  Let the EGT become stable between 620°C and 649°C.
 (k)  Set the L PACK and R PACK switches to the HIGH position.
 (l)  Let the EGT become stable for 1 to 2 minutes.
 (m)  Monitor the temperature indicator in the calibration kit to see
 when the EGT becomes stable.
 1) This temperature is the control temperature of the
 thermostat and must be between 620°C and 649°C.
 NOTE: This temperature must not be more than 649°C.____
 (n)  Set the L PACK and R PACK switches, on the P5 forward overhead
 panel, to the OFF position.
 (o)  Set the switches for the cabin temperature control to the OFF
 position.
 (p)  Set the APU BLEED switch, on the P5 forward overhead panel, to
 the OFF position.
 (q)  Set the ISOLATION VALVE switch, on the P5 forward overhead
 panel, to the CLOSE position.
 (r)  Remove the electrical load of 100 amps from the APU electrical
 generator.
 (s)  Do the APU usual shutdown (AMM 49-11-00/201).
 (t)  Set the APU master switch, on the P5 forward overhead panel, to
 the OFF position and attach a DO-NOT-OPERATE tag.
 (u)  Open this circuit breaker and attach a DO-NOT-CLOSE tag:
　
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