S 424-014
(4) Install an E-seal (9) on the large diameter flange of the check valve (12).
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747-400 MAINTENANCE MANUAL
S 434-018
CAUTION:_______ MAKE SURE YOU INSTALL THE LOCKING DEVICE OF THE COUPLING
CORRECTLY AS SHOWN IN FIGURE 401. IF YOU DO NOT INSTALL THE
COUPLING FINGERS INSIDE THE LOCKING DEVICE THE COUPLING CAN
LOOSEN AND CAUSE DAMAGE TO EQUIPMENT.
(5)
Install the coupling (8) at the HP/IP manifold (7) and the check valve (12) joint.
S 434-016
(6)
Tighten the coupling nut to 120 pound-inches.
S 434-014
(7)
Install the E-seals (3, 5, 11) on the duct/check valve flanges.
S 424-015
(8)
Install the HP/IP manifold (7) check valve (12) assembly into position.
S 424-012
(9)
Install the couplings (2, 4, 10) on the duct and the valve flange joints.
S 214-011
(10)
Make sure that the couplings are correctly installed.
S 434-017
(11)
Attach the duct support rod (17) to the HP/IP manifold (7) with the bolt (20), washer (19), bushing (18), washer (15) and nut (16).
S 434-019
(12)
Tighten the nut (16) on the bolt (20).
S 644-019
(13)
Apply anti-seize compound on the upstream supply line fitting for the PRV controller.
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747-400 MAINTENANCE MANUAL
S 434-020
(14)
Connect the upstream pressure supply line (6) for the pressure controller to the HP/IP duct.
S 434-021
(15)
Tighten the supply line nut.
F. Intermediate Pressure Check Valve Post Installation Test
S 714-013
(1) Do a test of the intermediate pressure check valve for leakage:
NOTE: This test will do a check of the upstream and downstream
____
flanges of the check valve.
(a)
Apply the leak detector to the flanges of the check valve.
(b)
Do the dry motor procedure for the engine (AMM 71-00-00/201) with the thrust reverser half in the open position.
(c)
Examine the valve flanges for leakage. 1) If the bubbles come slowly into view, the quantity of leakage is satisfactory.
2) If the bubbles come quickly into view (or if the leakage occurs in a high concentration), you must repair the cause of the leakage.
(d)
Stop the engine (AMM 71-00-00/201).
G. Put the Airplane Back to Its Usual Condition
S 864-011
(1)
Release the pressure in the pneumatic system (AMM 36-00-00/201).
(2)
Close the left thrust reverser half (AMM 78-31-00/201).
S 864-012
(3)
Do the activation procedure for the thrust reversers
(AMM 78-31-00/201).
S 414-020
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747-400 MAINTENANCE MANUAL
S 864-021
(4) Remove the electrical power if it is not necessary for other operations (AMM 24-22-00/201).
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