(b)  
Install the lockwire.

 S 794-014
 (4)  Do this leakage test for the valve.
 (a)  
Use the APU to pressurize the pneumatic system (Ref 36-05-00/201).

 (b)  
Examine the valve for leakage.

 NOTE: No leakage is permitted at the valve.
____
 (c)  Remove the pressure from the pneumatic system (Ref 36-05-00/201).
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A
737-300/400/500MAINTENANCE MANUAL
 E.  Put the Airplane Back to Its Usual Condition S 414-015
 (1) Close the stabilizer trim access door.
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A
737-300/400/500MAINTENANCE MANUAL
 ENGINE BLEED OVERHEAT SWITCH - REMOVAL/INSTALLATION
___________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task removes the engine bleed overheat switch. The second task installs the engine bleed overheat switch.
 TASK 36-11-71-004-001
 2.  Engine Bleed Overheat Switch Removal____________________________________
 A.  Access
 (1)  
Location Zones
 201/202 Control Cabin
 207 Strut
 208 Aft Strut Fairing

 (2)  
Access Panels
 5731/5831 Access Door Strut

 B.  Prepare to Remove the Overheat Switch
 S 864-002
 (1)  
Open the OVERHEAT circuit breaker on the P6 Load Control Panel and attach a DO-NOT-CLOSE tag.

 S 014-003

 (2)
Open the access panel to get access to the overheat switch.

 C.  Remove the Overheat Switch (Fig. 401)
 S 034-004
 (1)
Disconnect the electrical connector from the overheat switch.

 S 024-005

 (2)  
Remove the overheat switch from the mounting boss on the pneumatic duct.

 (3)  
Remove the packing ring.

 S 034-006
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A

737-300/400/500MAINTENANCE MANUAL
PRECOOLER CONTROL VALVE SENSOR (REF)
STARTER DUCT (REF)
PRECOOLER (REF)
SEE A
FWD  PNEUMATIC DUCT 
(490`F) SWITCH AIR OVERHEAT ENGINE BLEED 
ELECTRICAL CONNECTOR  MOUNTING BOSS 
PACKING RING 
A 
Engine Bleed Overheat Switch Installation Figure 401 

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A 737-300/400/500MAINTENANCE MANUAL
 TASK 36-11-71-404-007
 3. Engine Bleed Overheat Switch Installation
_________________________________________
 A. Consumable Materials
 (1) Antiseize - High temperature compound, MIL-A-907 or equivalent
 B. References
 (1)  AMM 24-22-00/201, Manual Control
 C. Access
 (1)  
Location Zones
 201/202 Control Cabin
 207 Strut
 208 Aft Strut Fairing

 (2)  
Access Panels
 5731/5831 Access Door Strut

 D. Install the Overheat Switch (Fig. 401)
　
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