(b)
For system No. 2, there must be 5400 pounds (2450 KG) of fuel in the No. 2 main tank.
(c)
For system No. 3, there must be 5400 pounds (2450 KG) of fuel in the No. 3 main tank.
(d)
For system No. 4, there must be 2000 pounds (900 KG) of fuel in the No. 4 main tank.
(6)
Push the HYD switch on the EICAS display select panel.
S 862-028
(7)
Pressurize the pneumatic system with a ground air source or with the APU (AMM 36-00-00/201).
S 862-027
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747-400 MAINTENANCE MANUAL
S 862-513
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL THE
_______ CONTROL SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. THE AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE EQUIPMENT.
CAUTION: DO NOT OPERATE THE PUMPS IN A HYDRAULIC SYSTEM WHEN THE SYSTEM
_______
IS TOO HOT. DAMAGE TO THE PUMPS CAN OCCUR.
CAUTION: THE HEAT EXCHANGERS IN THE HYDRAULIC SYSTEM USE FUEL TO REMOVE
_______ HEAT FROM THE HYDRAULIC FLUID. DO NOT OPERATE A HYDRAULIC PUMP FOR MORE THAN 15 MINUTES IF THERE IS NOT SUFFICIENT FUEL FOR THE OPERATION. DAMAGE TO THE PUMP CAN OCCUR.
CAUTION: DO NOT OPERATE A HYDRAULIC SYSTEM FOR 20 MINUTES AFTER A SYSTEM
_______ BECOMES TOO HOT. OPEN THE FAIRING DOORS ON THE TRAILING EDGE OF THE STRUT IF THE AIR TEMPERATURE IS MORE THAN 100°F (38°C). DAMAGE TO THE SYSTEM CAN OCCUR IF YOU DO NOT LET IT BECOME COOL.
(8)
Put the applicable HYD PUMPS DEMAND switch on the P5 panel in the ON position.
S 862-030
(9)
When you complete the hydraulic power operation, put the HYD PUMPS DEMAND switch in the OFF position.
S 862-031
(10)
Release the pressure in the hydraulic system (Ref paragraph 5).
S 862-032
(11)
Release the pressure in the pneumatic system (AMM 36-00-00/201).
(12)
On system 1 or 4, remove the ADP muffler from the turbine exhaust.
S 862-034
(13)
Remove electrical power if it is not necessary for other operations (AMM 24-22-00/201).
S 092-481
TASK 29-11-00-802-035
4. Hydraulic System Pressurization With an Engine-Driven Pump (EDP)
________________________________________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 36-00-00/201, Pneumatic System
(3)
AMM 71-00-00/201, Power Plant
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747-400 MAINTENANCE MANUAL
B. Procedure
S 862-036
(1)
Supply electrical power (AMM 24-22-00/201).
S 862-037
(2)
Make sure these circuit breakers for the applicable system are closed:
(a)
P7 Circuit Breaker Panel
1) 7F2 HYDRAULICS EDP DEPRESS 4
2) 7F3 HYDRAULICS HYDIM 1
3) 7G2 HYDRAULICS EDP DEPRESS 3
4) 7G3 HYDRAULICS HYDIM 2
5) 7H2 HYDRAULICS EDP DEPRESS 2
6) 7H3 HYDRAULICS HYDIM 3
7) 7J2 HYDRAULICS EDP DEPRESS 1
8) 7J3 HYDRAULICS HYDIM 4
9) 7J4 HYDRAULICS EDP SUPPLY 1
10) 7J5 HYDRAULICS EDP SUPPLY 2
11) 7J6 HYDRAULICS EDP SUPPLY 3
12) 7J7 HYDRAULICS EDP SUPPLY 4
(b)
P415 Main Power Distribution Panel
1) 415K37 HYD PRESS IND SYS 1
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