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29-11-00-860-801 Hydraulic System A or B Pressurization (P/B 201)
29-11-00-860-805 Hydraulic System A or B Power Removal (P/B 201)
B. Expendables/Parts
AMM Item Description AIPC Reference AIPC Effectivity
2 Fuse assembly 29-11-52-12A-641 GUN 001-028, 101-121,
155-157, 201-999
5 Fuse assembly 29-21-52-02-750 GUN 001-028, 101-121,
155-157, 201-999
8 Packing 29-21-52-02-735 GUN ALL
29-21-52-02-740 GUN 001-028, 101-121,
155-157, 201-999
C. Location Zones
Zone Area
133 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Left
D. Leading Edge Flap and Slat Hydraulic Fuse Installation
SUBTASK 27-81-61-420-001
(1) Do these steps if you install the two fuse assemblies [2] in system B:
(a) Hold thetwo fuse assemblies [2] in its position.
NOTE: The flow direction arrow on thetwo fuse assemblies [2] must agree with the arrow
on the pressure bulkhead.
(b) Tighten the nuts [1] and [3] to connect the hydraulic tubes to the two fuse assemblies [2].
SUBTASK 27-81-61-420-002
(2) Do these steps if you install thefuse assembly [5] in the standby system:
(a) Install the fuse assembly [5] to the valve [4].
1) Install a new O-ring packing [8] between thefuse assembly [5] and the valve [4].
(b) Hold thefuse assembly [5] and the valve [4] in their position.
NOTE: The flow direction arrow on thefuse assembly [5] and the valve [4] must agree
with the arrow on the pressure bulkhead.
(c) Tighten the nuts [6] and [7] to connect hydraulic tubes to thefuse assembly [5] and the
valve [4].
SUBTASK 27-81-61-860-002
(3) To pressurize the hydraulic systems B, do this task: Hydraulic System A or B Pressurization,
TASK 29-11-00-860-801.
(a) If you replaced the fuse assembly [2], you will need to pressurize the hydraulic system B.
(b) If you replaced the fuse assembly [5], you will need to pressurize the standby hydraulic
system.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-81-61
Page 404
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D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
SUBTASK 27-81-61-210-001
(4) Do a visual check of the fuse assembly [2] or fuse assembly [5] for hydraulic leaks.
SUBTASK 27-81-61-860-003
(5) To remove power from hydraulic sytems B, do this task: Hydraulic System A or B Power
Removal, TASK 29-11-00-860-805.
SUBTASK 27-81-61-610-001
(6) If it is necessary to service the hydraulic reservoirs, do this task: Hydraulic Reservoir
Servicing, TASK 12-12-00-610-801.
------------------------- END OF TASK ---------------------------
TASK 27-81-61-860-801
4. Flap and Slat Hydraulic Fuses (System B) Reset
A. References
Reference Title
29-11-00-860-801 Hydraulic System A or B Pressurization (P/B 201)
29-11-00-860-805 Hydraulic System A or B Power Removal (P/B 201)
B. Tools/Equipment
Reference Description
STD-1154 Container - 5 Gallon (19 Liters)
C. Location Zones
Zone Area
133 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Left
211 Flight Compartment - Left
212 Flight Compartment - Right
D. Procedure
SUBTASK 27-81-61-860-004
(1) Do these steps to reset the hydraulic fuses for system B:
(a) Make sure the flap control lever is in the UP position.
(b) Make sure there is no power on hydraulic system B. If it is necessary to remove power
from hydraulic system B, do this task: Hydraulic System A or B Power Removal,
TASK 29-11-00-860-805.
(c) Between the hydraulic fuse and the check valve upstream, loosen the B-nut sufficiently to
bleed off the hydraulic fluid into a 5 gallon (19 liter) container, STD-1154.
NOTE: The pressure difference across the hydraulic fuse must be 5 psi (34.5 kPa) for a
minimum of 5 seconds to put the hydraulic fuse back to the open position.
(d) Tighten the B-nut after you put the hydraulic fuse back to the open position.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-81-61
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Oct 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE FLIGHT
CONTROL SURFACES, THE THRUST REVERSERS, AND THE LANDING GEAR.
THESE COMPONENTS CAN MOVE SUDDENLY WHEN YOU SUPPLY HYDRAULIC
POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(e) To pressurize the hydraulic system B, do this task: Hydraulic System A or B
Pressurization, TASK 29-11-00-860-801.
(f) Do a check of the hydraulic fuse [2] for hydraulic leaks.
(g) To remove power from hydraulic system B, do this task: Hydraulic System A or B Power
　
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