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the bottom of the fairing.
The servicing components are on the aft bulkhead in the main
landing gear wheel well.
Physical Description
Brake accumulator and servicing components include:
* Brake accumulator
* Inflation valve
* Pressure transmitter
* Pressure indicator
* Brake pressure relief valve.
Functional Description
The accumulator is a gas charged unit with a floating piston that
separates the gas and the fluid. It has a precharge of 1000 psi
and a volume of 300 cubic inches (4.9 liters). Hydraulic system B
supplies pressure to the accumulator.
The brake accumulator pressure transmitter sends the
pressure signal to the brake pressure indicator in the flight
compartment.
The direct reading pressure indicator in the main landing gear
wheel well lets you see the accumulator pressure while you
service the accumulator.
Servicing instructions are on a placard by the charging valve
and transmitter.
When the accumulator is fully charged, it supplies enough
pressure for at least six full brake applications or to keep the
parking brake pressurized for eight hours.
The brake system relief valve opens when the pressure in the
brake accumulator increases to more than 3500 psi. This
prevents damage to the brake accumulator. The relief valve
closes when the pressure decreases to less than 3100 psi.
Training Information Point
Obey this warning when you operate the inflation valve:
WARNING: LOOSEN THE SWIVEL NUT ONLY. DO NOT
LOOSEN THE VALVE. PRESSURE IN THE VALVE
CAN BLOW THE VALVE OFF AND CAUSE INJURY
TO PERSONS OR DAMAGE TO EQUIPMENT.
HYDRAULIC BRAKE SYSTEM - BRAKE ACCUMULATOR
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-41-00-009
HYDRAULIC BRAKE SYSTEM - BRAKE ACCUMULATOR
HYDRAULIC BRAKE SYSTEM - BRAKE ACCUMULATOR
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-41-00-009
Purpose
Brake hydraulic fuses prevent hydraulic fluid loss if there is an
external leak downstream of the fuses.
Four hydraulic fuses in the normal brake lines protect each
brake during normal brake operation. Two hydraulic fuses in
the alternate brake lines each protect both brakes on a main
landing gear during alternate brake operation.
Location
The brake hydraulic fuses for the normal brake system are on
the aft bulkhead of the main landing gear wheel well.
The brake hydraulic fuses for the alternate brake system are on
the outboard sides of the upper bulkhead of the main landing
gear wheel well.
Physical Description
The brake hydraulic fuse is a volume type and has these
components:
* Housing
* Spring
* Piston
* Metering slot
* Manual bypass valve.
Functional Description
During normal operation, the piston and spring are at the
relaxed position. This lets fluid pressure go through the
metering slot and over the bypass valve normally. When the
pressure differential across the fuse starts to decrease below
normal, the piston starts to compress the spring.
If 60 to 95 cubic inches (0.9-1.5 liters) of fluid goes through the
hydraulic fuse metering slot and bypass valve, the piston
compresses the spring until the fuse is closed. When the
pressure differential across the hydraulic fuse decreases
between 0 and 30 psi, the fuse resets. This lets the spring
push the piston to the normal position.
A reset lever permits manual reset of the hydraulic fuse. To
reset the hydraulic fuse, move the reset lever in the direction
shown on the placard near the fuse. This operates a bypass
valve inside the hydraulic fuse that makes the pressure on each
side of the fuse equal.
There are no visual indications of a closed fuse.
Training Information Point
Hold the reset lever in the reset position while you bleed the
brakes so the fuse does not set.
HYDRAULIC BRAKE SYSTEM - BRAKE HYDRAULIC FUSES
EFFECTIVITY
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Page 18
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-41-00-010
HYDRAULIC BRAKE SYSTEM - BRAKE HYDRAULIC FUSES
HYDRAULIC BRAKE SYSTEM - BRAKE HYDRAULIC FUSES
EFFECTIVITY
GUN ALL 32-41-00
Page 19
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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