(b)
Continue the torque-hit procedure until three torque-hit cycles are completed.
(c)
Tighten the couplings to 115-125 pound-inches (13-14 N.m).
S 414-063
(14)
If it is necessary, tighten any loose duct sections (AMM 36-11-01/401).
S 434-058
(15)
Connect the bonding jumper to the ground stud on the valve.
S 764-059
(16)
Make sure that the resistance between the ground stud on the valve and the ground strap is less than 0.005 ohms (AMM 20-22-01/601)
S 434-060
(17)
Connect the wires to the terminal block on the PRV (1).
(a)
Install two washers and a nut at each terminal on the PRV terminal block (View C, Fig. 401).
S 424-070
(18)
Do these steps to install the P-Clamps:
(a)
Remove the bolt and washer that hold the P-Clamp to the valve heat shield.
NOTE: Valve PNs 790270-1 through -12 have a long bolt that
____ goes through a spacer under the heat shield. Hold the spacer while you remove the bolt to prevent dislocating the spacer. Newer valves have a short bolt that screws into a threaded spacer under the heat shield.
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747-400 MAINTENANCE MANUAL
(b) Put the P-Clamp in its position on the valve heat shield.
NOTE:____ Make sure that there are two layers of the permacel
tape between the wires and the P-Clamp.
(c) Reinstall the washer and the bolt on the valve heat shield.
1) Tighten the bolt 25 to 30 inch-pounds
(2.82 to 3.39 newton-meters).
2) Install a lockwire on the bolt (AMM 20-11-28/401).
(d) Put the spacers and the P-Clamp in their positions on the band
clamp stud.
NOTE:____ Make sure that there are two layers of the permacel
tape between the wires and the P-Clamp.
(e) Install the washer and the nut that hold the P-Clamp to the
band clamp.
1) Tighten the nut 25 to 30 inch-pounds
(2.82 to3.39 newton-meters).
S 864-021
(19)
For the applicable engine, remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a)
P6 Main Power Distribution Panel 1) 6H32 AIR SUPPLY CONT 1 PWR 2) 6H33 AIR SUPPLY CONT 2 PWR 3) 6H34 AIR SUPPLY CONT 3 PWR 4) 6H35 AIR SUPPLY CONT 4 PWR
S 864-023
(20)
Put the applicable ENGINE BLEED switch, on the P5 Overhead Panel, to the ON position.
S 984-024
(21)
Turn the manual override drive on the PRV (1) to the OPEN position.
(a)
Hold the PRV in the OPEN position.
S 714-061
(22)
Get access to the ECS maintenance page and make sure the PRV position shows OPEN.
S 984-026
(23)
Put the PRV manual override drive to the CLOSED position.
S 714-027
(24)
Make sure the PRV position shows CLOSED on the ECS maintenance page.
(25)
Make sure there are no STATUS or CMC messages for the PRV.
S 214-062
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MAINTENANCE MANUAL
S 794-029
(26)
Apply the leak detector to the valve flanges (1).
S 864-030
(27)
Pressurize the pneumatic system (Ref 36-00-00/201).
S 044-031
(28)
Make sure the thrust reverser is deactivated for ground maintenance.
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