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A
737-300/400/500MAINTENANCE MANUAL
 2)  AIRPLANES WITHOUT RAM AIR EXHAUST LOUVERS (POST-SB 21-1123); Make sure the ram air inlet door moves to a more closed position.
 3)  Make sure the RAM AIR FULL OPEN light goes off.
 (i)  
Release the ground sensing test switch.

 (j)  
Reconnect the D486 (D490) connector to the left (right) flow control and shutoff valve.

 S 414-014
 (3)  
Close the ECS bay doors.

 S 414-012

 (4)  
Close the access door to ram air duct.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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737-300/400/500MAINTENANCE MANUAL
 RAM AIR SENSOR - REMOVAL/INSTALLATION
_____________________________________
 1.  General_______
 A. This procedure has these tasks:
 (1)
Ram Air Sensor Removal

 (2)
Ram Air Sensor Installation

 B. The ram air sensor is located on the compressor outlet duct.
 TASK 21-52-13-004-022
 2.  Ram Air Sensor - Removal (Fig. 401)________________________
 A. Access
 (1)  Location Zones
 212 Left Air Conditioning Equipment Bay
 214 Right Air Conditioning Equipment Bay

 B. Prepare for the Removal
 S 864-001
 (1) Do these steps to remove the sensor for the left pack:
 (a) Open the left ECS bay access door.
 S 864-002
 (2) Do these steps to remove the sensor for the right pack:
 (a) Open the right ECS bay access door.
 C. Ram Air Sensor Removal
 S 024-024
 WARNING:_______DO NOT TOUCH THE COOLING PACK DUCTS WHEN THEY ARE HOT. HOT COOLING PACK DUCTS CAN CAUSE INJURY TO PERSONS.
 (1)
Disconnect the electrical connector from the sensor.

 (2)
Remove and discard the lockwire from the sensor.

 (3)
Remove the sensor.

 (4)
Remove and discard the o-ring from the sensor.

 S 024-004
 S 024-005
 S 024-017
 TASK 21-52-13-404-023
 3.  Ram Air Sensor - Installation (Fig. 401)_____________________________
 A. Consumables
 (1) D00006 Compound, nickel alloy - Never-Seez NSBT-8N
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
737-300/400/500MAINTENANCE MANUAL
SEE B
FWD
SEE A
A
ELECTRICAL
CONNECTOR

WATER SEPARATOR
RAM AIR SENSOR
AIR CYCLEMACHINE TURBINE
FWDAIR CYCLE MACHINE COMPRESSOR
B
Ram Air Sensor Installation Figure 401
G95495
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737-300/400/500MAINTENANCE MANUAL
 B. Access
 (1)  Location Zones
 212 Left Air Conditioning Equipment Bay
 214 Right Air Conditioning Equipment Bay

 C. Procedure
 S 424-018
 (1)  
Install a new O-ring on the sensor.

 S 424-019

 (2)  
Apply a thin layer of the compound, Never-Seez NSBT-8N on the threads of the temperature sensor.
　
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