S 864-019
(7)
With the aft door closed against the forward door, apply an evenly distributed load of 40 to 60 pounds (18.1 to 27.2 Kg) to the forward edge of the aft door.
S 824-020
(8)
Adjust the connecting rods so that the attachment bolts slip through the rod ends and the gate levers freely.
NOTE: When adjusting the rods, maintain approximately equal thread
____
engagement between the rod ends and rod.
S 434-021
(9) Tighten the connecting rod locknuts to 85 to 90 inch-pounds (9.6 to
10.2 Newton-meters), and lockwire in place.
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747-400 MAINTENANCE MANUAL
S 434-022
(10)
Install the connecting rod end bolts with washer under bolthead and sufficient washers under nut to provide cotter pin engagement.
S 434-023
(11)
Tighten the rod end nuts to 130 to 135 inch-pounds (14.7 to 15.3 Newton-meters) and install the cotter pins.
S 434-024
(12)
Install the bonding jumper to each door:
(a) Clean the bond surfaces of the ground strap on the door as follows: 1) Use 400 to 600 grit aluminum oxide sandpaper to prepare the
bond surfaces of the ground strap so that all surface finishes are removed and bright metallic bond surfaces are visible. a) Remove the minimum amount of material necessary to get
bright metallic surface.
2) Remove metal particles, dirt and any other contaminants from the bond surfaces asfollows: a) Pour clean, uncontaminated B00148 solvent, Methyl Ethyl
Ketone (MEK), ASTM D740, onto clean BMS15-5, Class A
absorbent wipers. b) Wipe the surfaces with the solvent soaked wiper. c) Immediately wipe surfaces dry with clean dry wipers
until all solvent is removed from the surfaces. d) Repeat the above three steps until the wiper shows no visible contamination or discoloration.
(b) Install the bonding jumper, bolt, three washers, and nut onto the ground strap of the door.
NOTE: Make sure the bonding jumper, bolt, washers, and the
____ nut are clean 1) Tighten the nut to a torque of 60 to 65 inch-pounds (6.8 to
7.3 Newton-meters).
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747-400 MAINTENANCE MANUAL
2) Make sure that the resistance between the ground strap and the bonding jumper is a maximum of 0.01 ohm.
S 434-025
(13)
Install the safety screen.
S 864-026
(14)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P6 Main Power Distribution Panel
1) 6J28 CABIN PRESS AUTO A
2) 6J29 CABIN PRESS AUTO B
3) 6J30 CABIN PRESS CONT L ICU
4) 6J31 CABIN PRESS CONT R ICU
5) 6L6 CABIN PRESS MAN L
6) 6L7 CABIN PRESS MAN R
(b)
P414 Main Power Distribution Panel
1) 414M8 CABIN PRESS ICU LEFT
2) 414B8 CABIN PRESS ICU RIGHT
(c)
P83 in aft equipment center
1) OUTFLOW VALVE-R
2) OUTFLOW VALVE-L
S 864-027
(15)
Apply electrical power (AMM 24-22-00/201).
S 864-031
(16)
Make sure that the air/ground relay system is in the ground mode.
S 744-030
CAUTION: MAKE SURE THERE IS NO BLOCKAGE IN THE VALVE FLAPPER DOORS.
_______ THE AUTOMATIC MOVEMENT OF THE VALVES DURING THE GROUND TEST CAN CAUSE DAMAGE IF THE VALVE FLAPPER DOORS ARE NOT FREE TO MOVE.
(17) Do a ground test of the cabin pressure control system (CPCS) on the CMC CDU (AMM 21-31-00/501).
(a) Make sure the AUTO SELECT switch is set to the NORM position.
NOTE: The AUTO SELECT switch is on the P5 overhead panel.
____
(b) Make sure the MAN L and MAN R switches are set to off.
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