(c)
APU VALVE
S 015-037
(9)
Disconnect the potable water system pressurization hose from the right side of the pneumatic system crossover manifold.
S 485-038
(10)
Install a BACC14AD06 seal cap assembly on the potable water pressurization boss on the crossover manifold duct.
(11)
Remove the APU check valve (AMM 36-11-08/401).
(12)
Install the 2TE65B07917 duct section.
S 035-039
S 485-040
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747-400 MAINTENANCE MANUAL
S 015-041
(13)
Open the 315A access door (AMM 06-09-05/201).
S 035-042
(14)
Remove the first coupling forward of the APU firewall from the APU duct.
S 485-072
(15)
Install the TE65B98600 block-off plate on the forward end of the duct joint.
S 865-080
(16)
Lock the pack flow control valves in the CLOSED position, if electrical power is not available.
S 015-104
(17)
Open access panel 191BL (AMM 06-09-03/201).
S 035-105
(18)
Disconnect the TAT aspirator tube at the boss on the crossover manifold duct.
S 425-106
(19)
Install a BACC14AD08 seal cap assembly at the boss.
S 015-044
(20)
Open the trailing edge fairing doors on each strut (AMM 54-62-00/201).
S 485-045
(21)
Remove the drain cap and install a BACC14AD06 cap in its place.
WARNING:_______ MAKE SURE THE BLOCK-OFF PLATE IS INSTALLED CORRECTLY AND THAT
THE DUCT SECTION CAN NOT MOVE WHEN YOU PRESSURIZE IT. IF THE
DUCT SECTION MOVES WHEN IT IS PRESSURIZED, IT CAN CAUSE
INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
NOTE: At the forward end of each strut diagonal brace, there is
____ a hydraulic reservoir pressurization tube connection. At the lowest point of this tube there is a drain cap with a small hole in it.
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747-400 MAINTENANCE MANUAL
S 865-098
WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP
CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL
MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP
CONTROL LEVER.
(22)
Extend the leading edge flaps to the 5 position with the alternate extension/retraction system (AMM 27-81-00/201).
S 865-047
(23)
Put the flap control handle in the 5 position.
S 485-048
(24)
Install a caution tag on the ALTN FLAPS ARM switch: "Caution - Do not put this switch in the off position".
S 485-049
(25)
Install caution tags on the Flap Drive Alternate Control switch and the Flap Control handle: "Caution - Do not move from the flaps 5 position".
S 865-050
(26)
Put the four ENGINE BLEED switches on the P5 overhead panel in the off position.
S 495-051
(27)
Connect the air source to one of the ground service pneumatic connections.
S 865-069
(28)
Pressurize the pneumatic system to 44-46 psig (AMM 36-00-00/201).
S 795-053
(29)
Examine all of the ducts and couplings in these areas for leakage:
NOTE: A small quantity of leakage is permitted from the
____ joints. There must not be a high concentration of leakage from the joints. A high concentration of air flow can be felt by the hand at a distance of 12 inches from the leakage source.
(a)
Strut ducts downstream of the engine bleed air PRSOV
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