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HYDRAULIC BRAKE SYSTEM - BRAKE METERING VALVE ASSEMBLY - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 32-41-00
Page 11
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-41-00-006
Purpose
The alternate brake selector valve selects and sends hydraulic
systems B or A pressure to the normal or alternate brake
systems.
The accumulator isolation valve holds pressure in the brake
accumulator when the alternate brake system gets pressure.
Location
Both valves are in the main landing gear wheel well on the
upper bulkhead.
Physical Description
The each valve is a two-position valve with these components:
* Housing
* Slide valve
* Pressure switch (alternate brake selector valve only).
Both valves are the same and are interchangeable except for a
pressure switch on the alternate brake selector valve.
Each valve gets pressure from two sources. The pressures
push on pistons in the valves that have different surface areas.
This moves the valves to select the brake source.
HYDRAULIC BRAKE SYSTEM - ALTERNATE BRAKE SELECTOR AND ACCUMULATOR ISOLATION VALVES
EFFECTIVITY
GUN ALL 32-41-00
Page 12
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-41-00-007
HYDRAULIC BRAKE SYSTEM - ALTERNATE BRAKE SELECTOR AND ACCUMULATOR ISOLATION VALVES
HYDRAULIC BRAKE SYSTEM - ALTERNATE BRAKE SELECTOR AND ACCUMULATOR ISOLATION VALVES
EFFECTIVITY
GUN ALL 32-41-00
Page 13
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-41-00-007
General
The alternate brake selector and accumulator isolation valves
operate together to control pressure to the normal and alternate
brake systems.
Alternate Brake Selector Valve
When hydraulic system A and B pressures are the same,
hydraulic system B pressure on the alternate brake selector
valve does not let hydraulic system A supply pressure to the
alternate brake system. In this position, the alternate brake
selector valve lets landing gear retract pressure pressurize the
alternate brake system during gear retraction.
When hydraulic system B does not supply pressure, the
alternate brake selector valve moves. This lets hydraulic
system A pressure supply pressure to the alternate brake
system.
The alternate brake selector valve pressure switch sends a
signal to the antiskid system when the alternate brake system
receives pressure.
See the antiskid/autobrake system for more information about
the anitskid system. (SECTION 32-42)
The pressure switch also sends a signals to the flight data
acquisition unit (FDAU).
See the Flight Data Recording System (FDRS) section for more
information on the flight data acquistion unit. (SECTION 31-31)
Accumulator Isolation Valve
When hydraulic system B does not supply pressure, alternate
brake system pressure from the alternate brake selector valve
moves the accumulator isolation valve. This isolates brake
accumulator pressure from the normal brake system.
When hydraulic system B and A do not supply pressure, brake
accumulator pressure moves the accumulator isolation valve.
This sends pressure from the brake accumulator to the normal
brake system.
HYDRAULIC BRAKE SYSTEM - ALT BRAKE SELECTOR AND ACCUM ISOLATION VALVES - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 32-41-00
Page 14
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-41-00-008
HYDRAULIC BRAKE SYSTEM - ALT BRAKE SELECTOR AND ACCUM ISOLATION VALVES - FUNCTIONAL DESCRIPTION
HYDRAULIC BRAKE SYSTEM - ALT BRAKE SELECTOR AND ACCUM ISOLATION VALVES - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 32-41-00
Page 15
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-41-00-008
Purpose
The brake accumulator supplies brake pressure to the normal
brake hydraulic system if there are no other pressure sources.
It is also the pressure source for the parking brake system
when the hydraulic systems do not supply pressure.
Location
The brake accumulator is in the right aft wing-to-body fairing. To
get access to the brake accumulator, open the hinged door on
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