(b)
When the APU EGT is stable, write down the EGT as
Temperature #5.
(c)
AIRPLANES WITH GARRETT APU MODELS GTCP85-129C,-129E,-129F; Make sure that the difference between the Temperature #1 APU EGT and the Temperature #5 APU EGT is between the MINIMUM and MAXIMUM curves shown in Figure 502.
(d)
AIRPLANES WITH GARRETT APU MODELS GTCP85-129H,-129J,-129K; Make sure that the difference between the Temperature #1 APU EGT and the Temperature #5 APU EGT is |40°C of the APU EGT shown in Figure 502 for the LOW FLOW curve.
(e)
Make sure that the duct pressure shown on the P5-10 panel is more than 27 psi.
(f)
Move the R PACK switch to OFF.
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A
737-300/400/500MAINTENANCE MANUAL
(g) Connect the electrical connector, D712, to the 35°F control sensor on the right water separator.
NOTE: The 35°F control valve will close.
____
F. Put the Airplane Back to Its Usual Condition
S 865-282
(1)
Shutoff the APU if it is not necessary (AMM 49-11-00/201).
S 865-283
(2)
Move the ISOLATION VALVE switch to CLOSE.
S 865-284
(3)
Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
S 415-285
(4)
Close the bay doors to the air conditioning equipment.
TASK 21-51-00-715-337
8. Operational Test - Air Cycle System - 35°F Control System Test______________________________________________________________
A. General
(1)
This procedure has the steps to test the 35°F control system.
(2)
This procedure supplies a quick check of the system performance for scheduled maintenance checks and to troubleshoot flight operation problems.
B. References
(1)
AMM 21-51-21/701, Heat Exchangers
(2)
AMM 21-61-00/101, Temperature Control System
(3)
AMM 24-22-00/201, Electrical Power
(4)
AMM 49-11-00/201, APU Power Plant
C. Access
(1) Location Zones
101 Control Cabin - Left
102 Control Cabin - Right
210 Air Conditioning Distibution Bay
212 Left Air Conditioning Equipment Bay
214 Right Air Conditioning Equipment Bay
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APU ~EGT (`C)
310
300
290
280
270
260
MAXIMUM MINIMUM
250
240
230
220
210
200
190
180
170
160
150
140
130
120
110
-20 -15 -10 -5 0 +5 +10 +15 +20 +25 +30 +35 +40
AMBIENT TEMPERATURE (`C)
NOTE: THESE LIMITS ARE FOR SEA LEVEL STATIC OPERATION. FOR HIGHER ELEVATIONS, RAISE EACH LINE BY 5`C PER 1,000 FEET.
Changes in APU EGT (with One A/C Pack Flow) per Changes in Ambient Temperature Figure 502 (Sheet 1)
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A 737-300/400/500MAINTENANCE MANUAL
320
280
240
200
160
120
HIGH FLOW
LOW FLOW
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