S 795-013

 (15)
 Examine all of the joints in the tubes for reservoir pressurization, between the pneumatic duct and the reservoir, for leaks.

 (16)
 Repair the cause of all leaks.

 S 665-059
 NOTE: A cap is in the tube for reservoir pressurization, near the
____ forward end of the diagonal brace. This cap has a hole which drains fluids. Do not seal this cap.
 S 865-014
 (17)
 Remove the pressure from the pneumatic system (AMM 36-00-00/201).

 S 865-015

 (18)
 Open the bleed valve on the reservoir pressurization module to remove the pressure from the reservoir (AMM 29-11-00/201).

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A
747-400 MAINTENANCE MANUAL
 S 865-016
 (19)
 Open these circuit breakers and attach DO-NOT-CLOSE tags.  Do not open the applicable circuit breaker for the hydraulic system on which you do the test.

 (a)  
P7 Overhead Circuit Breaker Panel
 1) 7F03 HYDRAULICS HYDIM 1
 2) 7G03 HYDRAULICS HYDIM 2
 3) 7H03 HYDRAULICS HYDIM 3
 4) 7J03 HYDRAULICS HYDIM 4

 S 485-017
 (20)
 Connect an air source to the port T on the reservoir pressurization module.

 S 865-036

 (21)
 Slowly pressurize the reservoir pressurization module until you can hear the flow of air from the vent line of the reservoir relief valve.

 NOTE: Do not increase the pressure of the air source to more than
____
 75 psig.

 S 215-037
 (22)
 Make sure the indication on the pressure gage becomes stable between 60 and 65 psig.

 (23)
 Slowly decrease the pressure of the air source to 52-54 psig.

 S 215-039

 (24)
 Make sure the pressure at which the flow of air stops is between 52 and 54 psig.

 S 865-038
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747-400 MAINTENANCE MANUAL
 S 865-040
 (25)
 Close the valve in the air supply.

 S 975-041

 (26)
 Make a record of the indication on the pressure gage.

 S 215-042

 (27)
 Monitor the indication on the pressure gage for five minutes.

 S 975-043

 (28)
 Make a record of the pressure after five minutes.

 S 975-044

 (29)
 Make sure the indication on the pressure gage did not decrease more than one psig during the five minutes.

 S 215-045

 (30)
 Monitor the EICAS SYNOPTIC PAGE (29 HYD) and the pressure gage on the reservoir pressurization module.

 S 865-046

 (31)
 Operate the bleed valve on the reservoir pressurization module to slowly decrease the reservoir pressure to 5-10 psig.

 S 975-047

 (32)
 Make a record of the pressure at which the EICAS message, RSVR PRESS, shows on the synoptic page.

 S 865-048

 (33)
 Slowly increase the pressure of the air source.

 S 975-049

 (34)
 Make a record of the pressure at which the EICAS message, RSVR PRESS, does not show on the synoptic page.

 S 975-050

 (35)
 Calculate the difference in the pressure at which the EICAS message, RSVR PRESS, shows and does not show.

 (36)
 Make sure the pressure difference is not more than 7 psig.

 (37)
 Close the valve in the air supply.

 S 865-025

 (38)
 Open the bleed valve on the reservoir pressurization module to remove the pressure in the reservoir (AMM 29-11-00/201).

 S 215-051
 S 865-024
　
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