D.
Access
(1)
Location Zones
138 Body Landing Gear Well - Right
221 Control Cabin, L.H.
222 Control Cabin, R.H.
E.
Prepare for the Installation
S 644-034
(1)
Lubricate new O-rings and backup rings.
S 434-035
(2)
Install the adapters with O-rings and backup rings in the parking brake module.
S 144-036
(3)
Clean the mating surfaces between the parking brake module and the mounting bracket to make an electrical bond.
F.
Procedure
S 424-056
(1)
Install the parking brake module.
(a)
Hold the parking brake module in its position on the mounting bracket.
(b)
Install 4 bolts, washers and nuts.
1) Tighten the bolts to 40-50 pound-inches.
(c)
Connect the hydraulic lines to the parking brake module (3 locations).
(d)
Connect the electrical connector DV23 to the electric motor on the parking brake module.
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747-400 MAINTENANCE MANUAL
S 764-041
(2)
Measure the resistance between the Parking Brake Module and the mounting bracket (AMM 20-22-01/601).
(a)
Make sure the resistance is not more than 0.0025 ohm.
(b)
If the resistance is more than 0.0025 ohm, clean the mating surfaces: 1) Remove the parking brake module 2) Clean the mating surfaces 3) Install the parking brake module 4) Measure the resistance again
S 864-042
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(3)
Pressurize hydraulic system 4 (AMM 29-11-00/201).
S 844-062
(4)
Push the brake pedals to the stops 5 times.
S 214-044
(5)
Look for leaks at the hydraulic fittings of the parking brake module.
S 864-045
(6)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a)
P6 Main Power Distribution Panel
1) 6L18 PARK BRAKE
S 724-048
(7)
Do a test of the parking brake module.
(a)
Set the parking brake.
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747-400 MAINTENANCE MANUAL
(b)
Make sure the EICAS message PARKING BRAKE SET shows on the EICAS display.
(c)
Make sure that the red manual override lever on the parking brake module is in POS 1.
(d)
Release the parking brake.
(e)
Make sure the EICAS message PARKING BRAKE SET does not show on the EICAS display.
(f)
Make sure that the PARKING BRAKE DISAGREE and ANTISKID OFF indications do not show on EICAS.
(g)
Make sure that the red manual override lever on the parking brake module is in POS 2.
S 844-065
(8)
Set the parking brake.
S 864-053
(9)
Remove hydraulic pressure (AMM 29-11-00/201).
S 864-054
(10)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 094-049
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ DOOR LOCKS FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(11)
Do this task: "Removal of the Door Locks from the Wing Landing Gear" (AMM 32-00-30/201).
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