(b)  
Hold the manual depressurization valve in the open position until you can not hear the flow of air.

 (c)  
Let the spring put the manual depressurization valve in the closed position.

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MAINTENANCE MANUAL

 S 215-012
 (2)  Make sure the RSVR lights for the left, right, and center hydraulic
 systems on the hydraulic control panel are on.
 S 215-013
 (3)  Make sure the EICAS messages, (L, C, R) HYD RSVR PRES, show on the
 EICAS display.
 S 215-014
 (4)  Make sure the (L, R, C) RSVR PRESS indication on the EICAS display
 shows LOW.
 S 035-021
 (5)  Remove the plug from the gage port, GA, on the reservoir
 pressurization module.
 S 485-022
 (6)  Connect a controlled air source to the gage port, GA, on the
 reservoir pressurization module.
 NOTE:____ The air source must have a shutoff valve.

 S 085-023
 (7)  Replace the vent in the air pressure line, for each hydraulic reservoir, with a plug (BACC14AD06JL).
 NOTE: The vent in the air pressure line to the left hydraulic
____ reservoir is on the forward bulkhead of the left wheel well.
 The vent in the air pressure line to the right hydraulic reservoir is on the forward bulkhead of the right wheel well.
 The vent in the air pressure line to the center hydraulic reservoir is in the hydraulic bay, in the aft left wing/body fairing.
 S 865-024
 (8)  
Slowly increase the pressure of the air source to 26 |3 psi.

 S 215-025

 (9)  
Make sure the RSVR lights for the left, right, and center hydraulic systems, on the hydraulic control panel are off.

 S 215-026

 (10)
 Make sure the EICAS messages, (L, C, R) HYD RSVR PRES, do not show on the EICAS display.

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MAINTENANCE MANUAL

 S 215-027
 (11)
 Make sure the (L, R, C) RSVR PRESS indication on the EICAS display shows NORM.

 S 865-028

 (12)
 Slowly increase the pressure of the air source.

 S 215-029

 (13)
 Make sure the (L, R, C) RSVR PRESS indication on the EICAS display changes to HIGH at a pressure of 56 |3 psi.

 S 865-030

 (14)
 Slowly increase the pressure of the air source.

 S 215-031

 (15)
 Make sure the pressure relief valve on each hydraulic reservoir opens at a pressure of 60 to 65 psi.

 NOTE: You can hear the air flow from the pressure relief valve
____
 when it opens.

 S 865-032
 (16)
 Close the shutoff valve on the air source.

 S 865-033

 (17)
 Push on the manual bleed valve, on the reservoir pressurization module, to remove the pressure from the air supply line of the air source.
　
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