S 035-005
(3) Disconnect the electrical connector from the temperature sensor T2 for the compressor inlet.
NOTE: The temperature sensor T2 is at the 7:30 position on the
____
compressor plenum.
S 825-004
(4) Adjust the ETC:
(a)
Start and operate the APU at a stable speed without a load applied (AMM 49-11-00/201).
(b)
Set the APU BLEED switch on the P5 forward overhead panel to the ON position.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
AFT CARGO COMPARTMENT DOOR
TEMPERATURE CONTROL (ETC)
Electronic Temperature Control Adjustment
Figure 501
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(c)
Set the ISOLATION VALVE switch on the P5 forward overhead panel to the OPEN position.
(d)
Set the L PACK and R PACK switches on the P5 forward overhead panel to the AUTO position.
(e)
After two minutes, set the L PACK and R PACK switches to HIGH.
(f)
Add a 100 amp electrical load to the APU electrical generator.
(g)
Monitor the APU EGT to make sure it is at the operators specific temperature between 566°C and 649°C (1050°F-1200°F).
(h)
If the APU EGT is not at the correct temperature, adjust the ETC: 1) Remove the ETC adjustment nut from the ETC. 2) Turn the ETC adjustment screw clockwise to increase the
EGT.
NOTE: One full turn of the adjustment screw will
____ change the EGT 3°C (6°F). The screw is a 25 turn adjustment screw without adjustment stops at the minimum and maximum positions. The screw will continue to turn after 25 turns but the EGT will not change.
3) Turn the ETC adjustment screw counterclockwise to decrease the EGT. 4) Install the adjustment nut on the ETC.
(i)
Remove the 100 amp electrical load from the APU electrical generator.
(j)
Set the L PACK and R PACK switches on the P5 forward overhead panel to the OFF position.
(k)
Set the ISOLATION VALVE switch, on the P5 forward overhead panel to the CLOSED position.
(l)
Set the APU BLEED switch on the P5 forward overhead panel to the OFF position.
(m)
Do the APU usual shutdown (AMM 49-11-00/201).
S 435-006
(5)
Connect the electrical connector to the temperature sensor T2 for the compressor inlet.
S 415-007
(6)
Attach the ETC cover to the cargo compartment ceiling with the seven bolts and the washers.
(7)
Close the door for the aft cargo compartment.
S 415-008
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ELECTRONIC TEMPERATURE CONTROL - INSPECTION/CHECK
_________________________________________________
1. General
_______
A. This procedure contains a task which does a check of the EGT control point of the ETC. To do this task, you must operate the APU and apply an electrical load while you monitor the APU EGT.
TASK 49-61-71-706-001
2. ETC Exhaust Gas Temperature Control Point Check (Fig. 601)
_______________________________________________
A. References
(1)
AMM 49-11-00/201, APU Power Plant
(2)
AMM 49-61-71/501, Electronic Temperature Control
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