S 215-121
(8)
Make sure that the temperature indication increases to 90|20°F (32|11°C).
S 215-122
(9)
Make sure that the CONT CABIN - DUCT OVERHEAT light and the left PACK TRIP OFF light do not come on.
S 865-123
(10)
Move the L PACK switch to OFF.
H. Topping Control Test - Duct Limit Sensor (Passenger Cabin)
NOTE: The cabin temperature must be less than 75°F (24°C) to do this
____
test.
S 865-124
(1)
Move the AIR TEMP switch to PASS CABIN, on the P5-17 panel.
S 215-125
(2)
Monitor the temperature indicator, on the P5-17 panel, and make sure that the cabin temperature is less than 75°F (24°C).
S 865-126
(3)
If the cabin temperature is more than 75°F (24°C), do these steps to decrease the cabin temperature:
(a)
Move the R PACK switch to AUTO or HIGH, on the P5-10 panel.
(b)
Move the PASS CABIN temperature selector switch to MANUAL COOL, on the P5-17 panel, until the cabin temperature is less than 75°F (24°C).
(4)
Move the R PACK switch to AUTO or HIGH, on the P5-10 panel.
(5)
Move the AIR TEMP switch to SUPPLY DUCT.
S 865-129
(6)
Push the PASS CABIN - DUCT OVERHEAT light, on the P5-17 panel, and the right PACK TRIP OFF light, on the P5-10 panel.
S 865-130
(7)
Move the PASS CABIN temperature selector switch to AUTO WARM, on the P5-17 panel while you monitor the temperature indicator.
S 865-127
S 865-128
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737-300/400/500MAINTENANCE MANUAL
S 215-131
(8)
Make sure that the temperature indication increases to 140|20°F (60|11°C).
S 215-132
(9)
Make sure that the PASS CABIN - DUCT OVERHEAT light and the right PACK TRIP OFF light do not come on.
S 865-133
(10)
Move the R PACK switch to OFF.
I. Operational Test - Duct Overheat Protection (Control Cabin)
S 215-134
(1)
Move the AIR TEMP switch to SUPPLY DUCT, on the P5-17 panel.
S 865-135
(2)
Move the L PACK switch to AUTO or HIGH, on the P5-10 panel.
S 865-136
(3)
Move the CONT CABIN temperature selector switch to MANUAL OFF, on the P5-17 panel.
S 865-137
(4)
Move the CONT CABIN temperature selector switch intermittently to MANUAL WARM while you do these steps:
NOTE: This will cause the air mix valve to move slowly toward the
____
hot position.
(a)
Monitor these indicators and lights: 1) Temperature indicator, on the P5-17 panel 2) CONT CABIN - AIR MIX VALVE indicator, on the P5-17 panel 3) CONT CABIN - DUCT OVERHEAT light, on the P5-17 panel 4) Left PACK TRIP OFF light, on the P5-10 panel 5) MASTER CAUTION lights, on the P7 panel
(b)
Make sure that the temperature indication is at 86°F (30°C) when these conditions occur: 1) The left PACK TRIP OFF light stays off. 2) The MASTER CAUTION lights come on.
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A 737-300/400/500MAINTENANCE MANUAL
3) The CONT CABIN - DUCT OVERHEAT light comes on. 4) The indicator needle of the CONT CABIN - AIR MIX VALVE indicator moves to the full COLD position.
(c)
Let the supply duct temperature decrease below 77°F (25°C).
(d)
Push the TRIP RESET switch, on the P5-10 panel.
(e)
Make sure that the MASTER CAUTION lights go off.
S 865-139
(5) Move the CONT CABIN temperature selector switch to MANUAL WARM.
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