S 754-137

 (17)
 Make sure the electrical bond between the element connector shell and the primary structure is less than 0.005 ohm (SWPM 20-20-00).

 S 414-024

 (18)
 Close the OVHT WHL WELL WING BDY circuit breaker on the panel P6-2.

 S 704-025

 (19)
 Do a Test of the wing and lower aft body overheat detection system (AMM 26-18-00/501).

 TASK 26-18-11-024-026
 4.  Aft Keel Beam Ovht Detection Element Removal (M273)___________________________________________________
 A. References
 (1)
AMM 20-10-51/401, Flareless Tubing Assembly

 (2)
AMM 29-09-00/201, Hydraulic Reservoir Pressurization System

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A
737-300/400/500MAINTENANCE MANUAL
 (3)  AMM 32-31-71/401, Landing Gear Transfer Valve
 B. Removal
 S 014-027
 (1)  Remove and save the small access panels and components located on the bottom of the keel beam at these body stations:
 (a)  
BDY STA 690.4

 (b)  
BDY STA 709.6

 S 014-031
 (2)  
Remove the landing gear transfer valve (AMM 32-31-71/401).

 S 034-032

 (3)  
Release the Pressure from the Hydraulic Reservoirs (AMM
 29-09-00/201).

 S 014-033

 (4)  
Remove/disconnect or move hydraulic lines as necessary to gain access to the removable fasteners which attach the two sheet metal covers to the keel beam near the fwd bulkhead in the wheel well area (AMM 20-10-51/401).

 S 024-138

 (5)  
Remove and save the fasteners which attach the two (2) covers to the keel beam.

 S 014-035

 (6)  
Remove/move covers to gain access to the ovht detection support brackets.

 S 014-036

 (7)  
Remove/disconnect or move hydraulic lines as necessary to gain access to the two covers located at the aft bulkhead on the keel beam (AMM 20-10-51/401).

 S 024-111

 (8)  
Remove and save the fasteners which attach the (2) aft covers to the keel beam.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 014-038
 (9)  
Remove/move covers to gain access to the ovht detection support brackets.

 S 024-039

 (10)
 At the fwd connection (D852) location, remove and discard the lockwire.

 S 024-112

 (11)
 Disconnect the electrical (D852) connector from the ovht detection element at the fwd location.

 S 024-113

 (12)
 At the aft connection (D854) location, remove and discard the lockwire.

 S 024-114

 (13)
 Disconnect the electrical (D854) connector from the ovht detection element at the aft location.

 S 024-115

 (14)
 At the fwd connection location (D852), remove and save the jamnut which attaches the ovht detection element to the flange.

 S 434-045

 (15)
 In the area just aft of the fwd connection, turn the screw head on the support bracket 1/4 turn counterclockwise.

 S 024-116

 (16)
 Remove and save the white grommet.

 S 984-047

 (17)
 Through the access hole at BDY STA 690.4, turn the screw heads on the support brackets 1/4 turn counterclockwise (2 places).

 (18)
 Remove and save the white grommets.

 S 984-049

 (19)
 Through the access hole at BDY STA 706.6, turn the screw head on the support bracket 1/4 turn counterclockwise.

 (20)
 Remove and save the white grommet.

 S 024-119

 (21)
 At the aft connection location, remove and save the jamnut which attaches the ovht detection element to the flange.
　
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