(10)
Make sure the EICAS message, "HYD PRESS SYS 1" ( 2, 3, or 4), shows.
S 864-016
(11)
If you replaced the switch for the demand pump, pressurize the hydraulic system with the demand pump (AMM 29-11-00/201).
S 864-017
(12)
If you replaced the switch for the EDP, pressurize the hydraulic system with the EDP (AMM 29-11-00/201).
S 714-018
(13)
Make sure the EICAS message, "HYD PRESS SYS 1" (2, 3, or 4), does not show on the EXISTING FAULTS page.
S 864-029
(14)
Put the air/ground system relay back in the ground mode (AMM 32-09-02/201).
S 794-019
(15)
Examine the switch for leakage.
S 864-020
(16)
Release the pressure in the hydraulic system (AMM 29-11-00/201).
S 364-021
(17)
If you find leakage at the switch, repair the cause of the leakage.
S 214-022
(18)
Examine the doors in the trailing edge fairing.
(a)
Examine the latches on the doors in the trailing edge fairing for cracks and wear.
(b)
Make sure that all latches are there.
(c)
Repair and adjust the latches if it is necessary (AMM 54-62-02/501).
S 414-023
CAUTION: MAKE SURE YOU LATCH THE DOORS IN THE TRAILING EDGE FAIRING
_______ CORRECTLY. IF THE DOORS OPEN DURING A FLIGHT, THIS CAN CAUSE DAMAGE TO THE DOORS.
(19) Close the doors in the trailing edge fairing (AMM 54-62-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 864-024
(20) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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A
747-400 FAULT ISOLATION/MAINT MANUAL
(FIG. 103) DISPLAY SYMBOL HYDRAULIC SYNOPTIC DESCRIPTION (TABLE 102) HYDRAULIC SYNOPTIC DISPLAY CORRECTION ACTION FAULT CODE AMM (POSSIBLE FDE) REFERENCE
THE NO. 1 HYDRAULIC ENGINE DRIVEN PUMP FOR SYSTEM HYDRAULIC SYSTEM IS NOT CORRECT FOR THE THE ENGINE DRIVEN PUMP FOR THE NO. 1 CONDITION OF THE AIRPLANE 29-11-21-00 29-11-29-00 29-11-37-00 29-11-47-00 (FIG. 104)
EDP SHUTOFF VALVE FOR THE NO. 1 HYDRAULIC SYSTEM THE EDP SHUTOFF VALVE FOR THE NO. 1 HYDRAULIC SYSTEM IS NOT CORRECT FOR THE CONDITION OF THE AIRPLANE 29-11-47-00 29-11-37-00 (FIG. 105)
DEMAND PUMP FOR THE NO. 1 HYDRAULIC SYSTEM THE DEMAND PUMP FOR THE NO. 1 HYDRAULIC SYSTEM IS NOT CORRECT FOR THE CONDITION OF THE AIRPLANE 29-11-13-00 29-11-14-00 29-11-29-00 29-11-37-00 29-11-47-00 (FIG. 106)
NO. 1 HYDRAULIC SYNOPTIC DIGITAL READOUTS THE NO. 1 HYDRAULIC SYNOPTIC DIGITAL READOUTS ARE NOT CORRECT FOR THE CONDITION OF THE AIRPLANE 29-11-01-00 29-11-05-00 29-11-06-00 29-11-33-00 29-11-37-00 29-11-47-00 29-17-01-00 (FIG. 107)
ENGINE DRIVEN PUMP FOR THE NO. 2 HYDRAULIC SYSTEM HYDRAULIC SYSTEM IS NOT CORRECT FOR THE CONDITION OF THE AIRPLANE THE ENGINE DRIVEN PUMP FOR THE NO. 2 29-11-23-00 29-11-30-00 29-11-38-00 (FIG. 108)
EDP SHUTOFF VALVE FOR THE NO. 2 HYDRAULIC SYSTEM HYDRAULIC SYSTEM IS NOT CORRECT FOR THE CONDITION OF THE AIRPLANE THE EDP SHUTOFF VALVE FOR THE NO. 2 29-11-38-00 (FIG. 109)
HYDRAULIC SYSTEM DEMAND PUMP FOR THE NO. 2 SYSTEM IS NOT CORRECT FOR THE CONDITION OF THE AIRPLANE THE DEMAND PUMP FOR THE NO. 2 HYDRAULIC 29-11-15-00 29-11-16-00 29-11-30-00 29-11-38-00 (FIG. 110)
DIGITAL READOUTS NO. 2 HYDRAULIC SYNOPTIC CONDITION OF THE AIRPLANE READOUTS ARE NOT CORRECT FOR THE THE NO. 2 HYDRAULIC SYNOPTIC DIGITAL 29-11-02-00 29-11-07-00 29-11-08-00 29-11-34-00 29-11-38-00 29-17-02-00 (FIG. 111)
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