B.
Procedure
(1) S 862-009Supply electrical power (AMM 24-22-00/201).
(2) S 862-010Make sure that these circuit breakers are closed: (a) Main Power Distribution Panel, P6 1) 6H20 L ISO VLV AIR SUPPLY PWR 2) 6H22 APU ISO VLV AIR SUPPLY PWR 3) 6H24 R ISO VLV AIR SUPPLY PWR 4) 6H32 AIR SUPPLY CONT ENG 1 5) 6H33 AIR SUPPLY CONT ENG 2 6) 6H34 AIR SUPPLY CONT ENG 3 7) 6H35 AIR SUPPLY CONT ENG 4
(3) S 862-011Put the two wing ISLN switches, on the P5 overhead panel, to the OPEN position.
(4) S 862-047If you operate the thrust reversers, put the PACKS 1, 2, and 3 switches, on the P5 overhead panel, to the NORM position.
(5) S 862-012Push the ECS switch on the EICAS display select panel.
(6) S 862-013Start the APU (Ref 49-11-00/201). (a) Let the operation of the APU become stable.
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A
747-400 MAINTENANCE MANUAL
S 862-014
(7)
Put the APU BLEED switch, on the P5 overhead panel, to the ON position.
(a)
The MANIFOLD DUCT PRESSURE is shown on the Primary EICAS display.
TASK 36-00-00-862-015
4. Pressurize the Pneumatic System with One or More Engines________________________________________________________
A. References
(1) 71-00-00/201, Power Plant
B. Procedure
S 862-016
(1) Supply electrical power (Ref 24-22-00/201).
S 862-017
(2) Make sure that these circuit breakers are closed: (a) Main Power Distribution Panel, P6 1) 6H20 L ISO VLV AIR SUPPLY PWR 2) 6H24 R ISO VLV AIR SUPPLY PWR 3) 6H32 AIR SUPPLY CONT ENG 1 4) 6H33 AIR SUPPLY CONT ENG 2 5) 6H34 AIR SUPPLY CONT ENG 3 6) 6H35 AIR SUPPLY CONT ENG 4
S 862-018
(3) Put the two wing ISLN switches, on the P5 overhead panel, to the OPEN position.
S 862-020
(4) Put the applicable ENGINE BLEED switch(es) to the ON position.
S 862-021
(5) Start and operate the engine(s) at ground idle (Ref 71-00-00/201). (a) Make sure that the L and R MANIFOLD DUCT PRESSURE shown on the Primary EICAS display is more than 20 psig.
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747-400 MAINTENANCE MANUAL
(b) Increase the engine thrust setting(s) to increase the duct pressure.
NOTE: The manifold duct pressure will not exceed 50 psig.
____
TASK 36-00-00-862-050
5. Pressurize the Pneumatic System Upstream of the PRSOV
_____________________________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 78-31-00/201, Thrust Reverser System
B.
Procedure
S 042-070
WARNING: DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER TO
_______ PREVENT THE OPERATION OF THE THRUST REVERSER. ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(1)
Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).
S 012-071
(2)
Open the fan cowl panels (AMM 71-11-04/201).
S 012-072
(3)
Open the core cowl panels (AMM 71-11-06/201).
S 012-073
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU OPEN THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(4) Open the thrust reverser halves (AMM 78-31-00/201).
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