(2)
Access Panels
1201 Electronic Equipment Access Door
3804 APU Cowl Door
D. Procedure
S 915-003
(1)
Start the APU (AMM 49-11-00/201).
S 715-004
(2)
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.
S 865-005
(3) Apply the load to the APU:
(a)
Put an electrical load of 100 amps on the APU electrical generator.
(b)
Set these switches on the P5 forward overhead panel: 1) Set the ISOLATION VALVE switch to the OPEN position. 2) Make sure the engines 1 and/or 2 BLEED switches on the P5
forward overhead panel are in the OFF position. 3) Set the APU BLEED switch to the ON position. 4) Set the switches for the cabin temperature controls to the
AUTO position. 5) Set the L PACK and R PACK switches to the AUTO position.
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(c)
Let the EGT to become stable in 1 to 2 minutes.
(d)
Set the L PACK and R PACK switches to the HIGH position.
(e)
Let the EGT to become stable in 1 to 2 minutes.
S 715-006
(4) Look at the FREQ meter on the P5 forward overhead panel:
NOTE: With a full load applied to the APU, the FREQ meter must
____
become stable between 397-417 CPS.
S 715-141
(5) Look at the EGT indicator on the P5 forward overhead panel:
(a) AIRPLANES WITHOUT THE ETC; With the full load applied to the APU, the EGT must become stable between 620-649°C (1148-1200°F). 1) If it is necessary to adjust the APU control thermostat to
a higher EGT set-point, adjust the APU control thermostat (AMM 49-52-32/501).
NOTE: For extended APU service life, the EGT set-point is
____ set at the lower EGT limit range. A lower EGT set-point may cause main engine start problems. A higher EGT set-point will correct the main engine start problems.
(b) AIRPLANES WITH THE ETC; With the full load applied to the APU, the EGT must agree with the operation limits (Fig. 502, Fig. 502A). 1) If it is necessary to adjust the ETC to a higher EGT
set-point, adjust the ETC (AMM 49-61-71/501).
NOTE: For extended APU service life, the EGT set-point
____ for the ECS mode is set at the lower EGT limit range. The EGT limit range is 566-649°C (1051-1200°F). A higher EGT set-point causes better ECS performance.
S 865-007
(6) Remove the load from the APU:
(a)
Set these switches on the P5 forward overhead panel: 1) Set the L PACK and R PACK switches to the OFF position. 2) Set the switches for the cabin temperature controls to the
OFF position. 3) Set the APU BLEED switch to the OFF position. 4) Set the ISOLATION VALVE switch to the CLOSE position.
(b)
Remove the electrical load of 100 amps from the APU electrical generator.
(c)
Let the APU to operate in the no load condition for a minimum of 1 minute.
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
OUTSIDE AIR TEMPERATURE (OAT) VS APU EXHAUST GAS TEMPERATURE (EGT)
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