D.
Procedure

 S 424-005
 (1)  
Install the hydraulic fuse (Fig. 401):

 (a)  
Remove the reducer from each end of the removed fuse.

 (b)  
Lubricate the O-rings with hydraulic fluid or assembly lubricant.

 (c)  
Install the reducers on the replacement fuse with the O-rings.

 NOTE: The leading edge fuse (retract) is connected to the
____ check valve. Make sure to reinstall the check valve with the flow direction aft.
 (d)  Put the fuse in its position.
 NOTE: The flow direction arrow must agree with the arrow
____ on the pressure bulkhead.
 (e)  Tighten the inlet and outlet lines.
 S 864-018
 (2)  
Do this task to pressurize hydraulic systems A and B: "Leading Edge Flaps and Slats Hydraulic Systems A and B Pressurization" (Ref 27-81-00/201).

 S 214-021

 (3)  
Make sure there are no leaks.

 S 864-019

 (4)  
Do this task if it is necessary to depressurize hydraulic systems A and B: "Leading Edge Flaps and Slats Hydraulic Systems A, B and Standby Depressurization" (Ref 27-81-00/201).

 S 614-006

 (5)  
Do this task if servicing is necessary for the hydraulic reservoirs: "Hydraulic Reservoir Servicing" (Ref 12-12-00/301).

 TASK 27-81-61-864-007
 4. Flap and Slat Hydraulic Fuses (System B) Reset
______________________________________________
 A. References
 (1)  27-81-00/201, Leading Edge Flap and Slat Control System
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-81-61
 ALL  ú ú 02 Page 403 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B. Access
 (1)  
Location Zone
 101 Control Cabin, LH
 216 Main Wheel Well, LH
 102 Control Cabin, RH
 217 Main Wheel Well, RH

 C.
Reset the Hydraulic Fuses (System B)

 S 864-008
 (1)  
Make sure the flap control lever is in the FLAP UP detent.

 S 864-009

 (2)  
Do this task to depressurize hydraulic systems A and B: "Leading Edge Flaps and Slats Hydraulic Systems A, B and Standby Depressurization" (Ref 27-81-00/201).

 S 034-010
 WARNING:_______BE CAREFUL WHEN YOU LOOSEN THE B-NUT. HYDRAULIC FLUID CAN SPRAY ON YOU AND CAUSE INJURY.
 (3)  Between the hydraulic fuse and check valve upstream, loosen the B-nut sufficiently to bleed off the hydraulic fluid into a container.
 NOTE: Each fuse will reset (gets open) automatically when hydraulic
____ pressure on both sides of fuse is equalized within 5 psi for ten seconds.
 S 434-011
 (4)  
Tighten the B-nut after you put the hydraulic fuse back to the open position.

 S 864-012

 (5)  
Do this task to pressurize hydraulic systems A and B: "Leading Edge Flaps and Slats Hydraulic Systems A and B Pressurization" (Ref 27-81-00/201).

 (6)  
Make sure there are no leaks.

 S 864-014

 (7)  
Do this task if it is necessary to depressurize hydraulic systems A and B: "Leading Edge Flaps and Slats Hydraulic Systems A, B and Standby Depressurization" (Ref 27-81-00/201).

 S 214-013
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-81-61
 ALL  ú ú 02 Page 404 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 TASK 27-81-61-864-015
 5. Flap and Slat Hydraulic Fuse (Standby System) Reset
___________________________________________________
 A. References
 (1)  
27-81-00/201, Leading Edge Flap and Slat Control System

 B.
Access
　
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