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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 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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