psig. 2) Make sure the HYD PRESS SYS 1, 2, 3, or 4 EICAS display goes out when the SYS FAULT light goes out.
3) Make sure these displays show on the primary EICAS screen when the SYS FAULT light goes out: a) HYD PRESS ENG 1, 2, 3, or 4 b) HYD PRESS DEM 1, 2, 3, or 4.
4) Make sure the function display, for the applicable system, on the hydraulic synoptic page of the auxiliary EICAS screen goes out when the SYS FAULT light goes out.
S 785-022
(18)
Do these steps while you monitor the PRESS light for the applicable engine and the test bench pressure:
(a)
Slowly increase the test bench pressure to 1600 psig.
(b)
Write down the test bench pressure when the engine PRESS light goes off (_______psig). 1) Make sure the engine PRESS light goes off between 1400-1600
psig.
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747-400 MAINTENANCE MANUAL
2) Make sure the HYD PRESS ENG 1, 2, 3, or 4 EICAS display goes out after the engine PRESS light goes out.
S 865-023
(19)
Slowly increase the test bench pressure to 2950-3050 psig.
(a)
Make sure the system pressure display on the EICAS status page is between 2850-3150 psig.
S 715-024
(20) Stop for 5 minutes with the test bench pressure between 2950-3050 psig.
(a) Make sure the reservoir does not become too full during the 5
minutes.
NOTE:____ Look at the EICAS HYD display to monitor the
reservoir level. Do not use the status display.
(b) If OF shows adjacent to the QTY indication for the applicable
system on the EICAS maintenance display, stop the test.
S 795-025
(21)
Examine all the system tube and hose connections for leakage.
(a)
If you find leakage, repair the cause of it.
S 785-026
(22)
Make sure the system hydraulic pressure on the EICAS status display and the test bench pressure agree (| 100 psi).
S 865-027
(23)
Put the source select switch for the EIU in the AUTO position.
S 785-028
(24)
Make sure the EICAS pressure indications for the other three systems are between 0-160 psig.
S 865-029
(25)
Put the applicable HYD PUMPS DEMAND switch on the P5 panel in the AUTO position.
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747-400 MAINTENANCE MANUAL
S 215-030
(26)
Make sure the PRESS light for the demand pump goes out.
S 215-031
(27)
Make sure the HYD PRESS DEM 1, 2, 3, or 4 EICAS display goes out when the PRESS light for the demand pump goes out.
S 785-032
(28)
Do these steps while you monitor the PRESS light for the applicable engine and the test bench pressure:
(a)
Slowly decrease the test bench pressure to 1400 psig.
(b)
Write down the test bench pressure when the engine PRESS light comes on (_______psig). 1) Make sure the engine pump PRESS light comes on between
1400-1600 psig. 2) Make sure the PRESS light for the demand pump comes on when the PRESS light for the engine comes on.
3) Make sure these displays show on the primary EICAS screen when the PRESS lights for the demand pump and the engine pump come on: a) HYD PRESS ENG 1, 2, 3, or 4 b) HYD PRESS DEM 1, 2, 3, or 4.
S 865-033
(29)
Push the MASTER CAUTION light on the pilots glare shield to set the displays.
S 785-034
(30)
Do these steps while you monitor the applicable SYS FAULT light and the test bench pressure:
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