(a)
Discard the packing (5) and the retainer (4).

 S 034-010
 (5) Put a cover on the duct opening to keep out unwanted objects.
 TASK 36-22-01-404-011
 3. Install the Bleed Air Overtemperature Switch (Fig. 401)
____________________________________________
 A. Consumable Materials
 (1)
G00095 Detector - Leak, Leak-Tek (160X)

 (2)  
D00062 Lubricant - Pneumatic System Thread, FS 1292 (Fluor-Silicone) MIL-G-4343

 B.
Parts

 ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Overtemperature Switch | 36-22-01 | 02 | 15 | | | 3 | Jamnut | | | 20 | | | 4 | Retainer | | | 25 | | | 5 | Packing | | | 30 | 2......…........…...................................…..........….....….........1
 C. References
 (1)
AMM 24-22-00/201, Manual Control

 (2)
AMM 36-00-00/201, Pneumatic System

 (3)
AMM 45-10-00/201, Central Maintenance Computer System

 (4)
AMM 54-62-00/201, Nacelle Strut Access Panels

 (5)
AMM 71-00-00/201, Power Plant

 (6)
AMM 78-31-00/201, Thrust Reverser

 D.
Access

 (1)  
Location Zone
 452 Nacelle Strut 1 - Torque Box
 462 Nacelle Strut 2 - Torque Box
 472 Nacelle Strut 3 - Torque Box
 482 Nacelle Strut 4 - Torque Box

 (2)  
Access Panel 452DR Access Door, Midlower Strut (Forward) - Nacelle Strut 1 462DR Access Door, Midlower Strut (Forward) - Nacelle Strut 2 472DR Access Door, Midlower Strut (Forward) - Nacelle Strut 3 482DR Access Door, Midlower Strut (Forward) - Nacelle Strut 4

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747-400 MAINTENANCE MANUAL
 E. Procedure
 S 044-026
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER TO
_______ PREVENT THE OPERATION OF THE THRUST REVERSER. ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Do the deactivation procedure for the thrust reverser (forward thrust position) for ground maintenance (AMM 78-31-00/201).

 S 644-053

 (2)  
Lubricate the new packing (5).

 (a)  
Install the new packing (5) on the overtemperature switch (1).

 S 424-031
 (3)
Do the steps that follow to install the overtemperature switch (1):

 (a)  
Remove the covers from the duct opening.

 (b)  
Install the overtemperature switch (1) and the retainer (4).

 (c)  
Tighten the jamnut (3).

 (d)  
Install the lockwire.

 (e)  
Connect the wires (2) to the overtemperature switch (1).

 S 864-016
 (4)  
For the applicable engine, remove the DO-NOT-CLOSE tag and close the circuit breaker that follows:

 (a)  
On the main power distribution panel:
 1) 6H32, ENG 1 AIR SUPPLY CONT
 2) 6H33, ENG 2 AIR SUPPLY CONT
 3) 6H34, ENG 3 AIR SUPPLY CONT
 4) 6H35, ENG 4 AIR SUPPLY CONT

 F. Do the Test for the Installation of the Overtemperature Switch
 S 794-017
 (1)  Apply the leak detector around the mounting boss.
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A
747-400 MAINTENANCE MANUAL
 S 864-018
 (2)  
Put the applicable ENGINE BLEED switch to the OPEN position.

 S 794-065

 (3)  
Do method 1 or method 2 to apply pressurized air to the overtemperature switch.

 (a)  
　
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