26-12-01
 ALL  ú ú 01 Page 402 ú Jun 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 S 024-026
 (3)  
Access to the aft strut overheat switches S10196, S10199, S10202, and S10205 may require disconnection of the strut pneumatic duct. If this is required, do this procedure: Pneumatic Duct - Removal/Installation (AMM 36-11-01/401).

 S 034-003

 (4)  
Disconnect the wires from the terminals on the strut overheat switch.

 S 034-021

 (5)  
Remove the sealant around the switch on the top or the bottom where applicable.

 S 034-022

 (6)  
Remove the washer and lock nut if applicable.

 S 034-004

 (7)  
Loosen the switch and remove.

 TASK 26-12-01-424-005
 3.  Install the Strut Overheat Switch (Fig. 401)_________________________________
 A. References
 (1)  
AMM 06-43-00/201, Engine Nacelle Access Doors and Panels

 (2)  
AMM 24-22-00/201, Electrical Power Control

 (3)  
AMM 78-31-00/201, Thrust Reverser System

 B. Access
 (1)  
Location Zones
 119/120 Main Equipment Center
 200 Upper Half of Fuselage
 211/212 Flight Compartment
 430/440 No. 1/No. 2 Nacelle Strut

 (2)  
Access Panels

 (a)  
413, 423 L, R Fan Cowl Panel (Left)

 (b)  
414, 424 L, R Fan Cowl Panel (Right)

 (c)  
415, 425 L, R Fan Reverser (Left)

 (d)  
416, 426 L, R Fan Reverser (Right)

 (e)  
432AL, 433JR, 433LR Nacelle Strut - Left engine No. 1

 (f)  
442AL, 443HL, 443LL Nacelle Strut - Right Engine No. 2

 C. Procedure
 S 754-006
 (1)  Make sure these circuit breakers on the overhead circuit breaker panel, P11, are open and attach DO-NOT-CLOSE tags:
 (a)  
11B20, FIRE DETECTION L ENGINE 1

 (b)  
11B21, FIRE DETECTION L ENGINE 2

 (c)  
11B22, FIRE DETECTION R ENGINE 1

 (d)  
11B23, FIRE DETECTION R ENGINE 2

 (e)  
11J26, FIRE DET ALTN PWR ENGINE LEFT

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 26-12-01
 ALL  ú ú 01 Page 403 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 (f)  11J27, FIRE DET ALTN PWR ENGINE RIGHT
 S 754-007
 (2)  
Make sure the surfaces where the switches are to be installed are clean and free of damage.

 S 434-008

 (3)  
Install the strut overheat switches using existing fasterners on the bottom of the upper spar or lock nuts, or washers if applicable.

 NOTE: Switches in the precooler area are installed on the washers
____ and are sealed with sealant DC 93-000. Switches which are forward and aft of the precooler do not require washers, but are sealed with sealant DC 93-000.
 S 434-023
 (4)  
Tighten to a maximum of 22 pound-inches (2.48 Newton.Meters) for the forward and aft strut overheat switches S10194, S10198, S10201, S10204, S10196, S10199, S10202, and S10205. Tighten to a maximum of 40 pound-inches (4.5 Newton. Meters) for the precooler area strut overheat switches S10195, S10197, S10200, and S10203.

 S 434-009

 (5)  
Connect the wires to the terminals on the switch.

 D. Do a test of the Strut Overheat Switch Installation
 S 864-010
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 034-011

 (2)  
Remove the DO-NOT-CLOSE tags, and close these circuit breakers on the P11 panel:

 (a)  
11B20, FIRE DETECTION L ENGINE 1

 (b)  
11B21, FIRE DETECTION L ENGINE 2

 (c)  
11B22, FIRE DETECTION R ENGINE 1

 (d)  
11B23, FIRE DETECTION R ENGINE 2

 (e)  
11J26, FIRE DET ALTN PWR ENG LEFT

 (f)  
11J27, FIRE DET ALTN PWR ENG RIGHT

 (3)
Close the EICAS circuit breakers on the P11 panel six locations.

 (4)  
　
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