S 214-036
(11) Look at the auxiliary EICAS display for the EICAS Status message that follows:
NOTE: To look at the status message(s) it is necessary to push
____
the status (STAT) key on the Display Select Panel.
(a) Make sure the EICAS message, "HYD RSVR PRESS 1" (or 2, 3, or 4, as applicable), shows.
S 794-022
(12)
Apply leak detector to the joint between the switch and the manifold.
S 864-023
(13)
Pressurize the pneumatic system (AMM 36-00-00/201).
S 714-024
(14)
Make sure the "HYD RSVR PRESS 1" (or 2, 3, or 4, as applicable) message does not show on the EICAS status page.
S 794-025
(15)
Make sure there are no leaks at the joint between the manifold and the switch.
(16)
If you find a leak, repair the cause of it.
S 214-027
(17)
Examine the doors on the trailing edge fairing:
(a)
Examine the latches on the doors in the trailing edge fairing for cracks and wear.
S 364-026
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747-400 MAINTENANCE MANUAL
(b)
Make sure all the latches are there.
(c)
Repair and adjust the latches if it is necessary
(AMM 54-62-02/501).
S 414-038
CAUTION: MAKE SURE YOU LATCH THE DOORS ON THE TRAILING EDGE FAIRING
_______ CORRECTLY. IF THE DOORS OPEN DURING A FLIGHT, THIS CAN CAUSE DAMAGE TO THE DOORS.
(18)
Close the doors in the trailing edge fairing (AMM 54-62-00/201).
S 864-029
(19)
Release the pressure in the pneumatic system if it is not necessary (AMM 36-00-00/201).
(20)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 864-030
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2.
3.
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747-400 MAINTENANCE MANUAL
HYDRAULIC GROUND SERVICING SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________________
General (Fig. 1)
_______
A. The hydraulic ground servicing system is used for filling the hydraulic reservoirs from one location. All components of the system are found in the left body gear wheel well. The system has a manually operated hand pump with a suction line, a connection for a ground cart pressure fill, a reservoir quantity fill indicator, a selector valve, and a reservoir fill filter.
Hand Pump (Fig. 1)
_________
A. A hand pump is used to fill the hydraulic reservoirs when pressure fill equipment is not available. It is a double acting piston-type pump with a spring-loaded one-way valve in the piston head, and another in the suction port. When the pump is not in use, the handle is removed and put in a bracket next to the pump.
Selector Valve (Fig. 1)
______________
A. The valve is used to control the flow of fluid to the applicable supply system reservoir. The assembly has ports IN A and IN B, out ports 1, 2, 3, and 4, and a five-position quantity indicator switch. The switch is mechanically connected to the valve such that it will be operated with the valve when the selector handle is turned. The switch and the valve can turn continuously in either direction. The unit operates also as a shutoff valve for all of the ports. When the selector handle is turned to the closed position, the quantity indicator switch is also put in the off position.
Reservoir Quantity Fill Indicator (Fig. 1)
_________________________________
A. The indicator is used to measure fluid quantity in the reservoir selected by the position of the selector valve. It is connected by the selector valve switch to the HYQUIM which sends a signal to the EICAS to give a duplicate indication of the reservoir fluid quantity.
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