S 735-044
(7)
Do the system test of the hydraulic brake system.
S 035-176
(8)
Remove the rudder pedal arm rig pins R-1 and R-2
(AMM 27-21-06/401) if they are installed.
TASK 32-41-00-735-014
6. Hydraulic Brake System - System Test
____________________________________
A. General
(1)
The system test of the hydraulic brake system includes the topics that follow:
(a)
Test of the mechanical linkage
(b)
Test of alternate source selection
(c)
Test of normal brake operation
(d)
Test of pedal distance and force (left and right side)
(e)
Test of the automatic brake application after landing gear retraction.
(2)
Line hammer or chatter of the brake valves must not occur during any part of the system test.
B.
Special Tools and Equipment
(1)
G12001-15 - Rig Pin No. 3 (forward rudder
quadrant) part of Rigging Pin Kit
G12001-XX
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C.
D.
E.
A
747-400 MAINTENANCE MANUAL
(2) 4MIT65B80307-1 - Protractor Assembly
NOTE: This tool is optional to F52485-500
____
(3)
F52485-500 - Protractor Assembly
(4)
J32001-39 Brake Pedal Measuring Equipment
NOTE: This equipment can be used instead of protractor
____ assembly and spring scale to measure brake pedal forces and brake pedal angles.
(5)
Spring Scale, 0 to 100 pound capacity -Commercially Available
(6)
Pressure Gages, 0 to 4000 PSI pressure capacity - Commercially Available (16 Necessary)
References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 12-15-09/301, Brake Hydraulic Accumulator
(3)
AMM 12-15-11/301, Hydraulic Pressure Surge Accumulator
(4)
AMM 24-22-00/201, Manual Control
(5)
AMM 29-11-00/201, Main Hydrualic Supply System
(6)
AMM 32-00-30/201, Landing Gear Ground LocksAccess
(1)
Location Zones 117 Electrical & Electronics Compartment L.H. (P414 Power Distribution Center Left) 118 Electrical & Electronics Compartment R.H. (P415 Power Distribution Center Right) 135 Wing Landing Gear Well - Left (Left Brake Metering Valve) 136 Wing Landing Gear Well - Right
(Right Brake Metering Valve)
221 Control Cabin, LH
222 Control Cabin, RH
735 Wing Landing Gear - Left
745 Wing Landing Gear - Right
755 Body Landing Gear - Left
765 Body Landing Gear - Right
Preconditions
S 865-182
(1)
These conditions are necessary for this task:
(a)
Electrical power is available (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
(b)
The brake hydraulic accumulator precharge pressure is correct (AMM 12-15-09/301).
(c)
The surge accumulators precharge pressure is correct (AMM 12-15-11/301).
(d)
The hydraulic systems are serviceable (AMM 29-11-00/201).
(e)
The Integrated Display System (IDS) is serviceable (AMM 31-61-00/501).
F.
Prepare for the Test
S 495-089
(1) Make sure the ground locks are installed on all the landing gear (AMM 09-11-00/201).
S 495-091
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
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