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(2) S 865-009Make sure these circuit breakers on the overhead panel, P11, are closed: (a) 11K19, HYDRAULICS QTY CTR (b) 11K20, HYDRAULICS QTY LEFT (c) 11K21, HYDRAULICS QTY RIGHT (d) EICAS (6 locations)
(3) S 865-010Push the ELEC/HYD switch on the EICAS maintenance panel.
(4) S 215-011Make sure the quantity indication on EICAS is at least 0.80 for each hydraulic system.
(5) S 865-012If you use the pneumatic system to pressurize the reservoir in each system, supply pneumatic power (AMM 36-00-00/201).
NOTE:____ If the pneumatic system operated immediately before this test, it is not necessary to pressurize the reservoirs.
(6) S 865-013If you use an external air source to pressurize the reservoirs, do these steps: (a) Remove the plug from the pressure gage port, GA, on the reservoir pressurization module. (b) Install an air pressure gage in the GA port on the reservoir pressurization module. (c) Connect an air pressure source to the manual bleed valve on the reservoir pressurization module.
NOTE:____ All three reservoirs will be pressurized at the same time The reservoir depressurization valve on each reservoir must be in the closed (not vented) position.
(d) (e) Push the manual bleed valve into the pressurization module.Adjust the air supply pressure to pressurize the reservoirs to 33 |1 psi.
NOTE:____ The air pressure lines between the pressurization module and the reservoirs have moisture vent orifices. These orifices bleed air pressure from the lines after the air source is removed. The depressurization module check valves hold the air pressure in each reservoir.
(f) (g) When the reservoirs are pressurized, decrease the air pressure source to zero.Remove the air pressure source from the manual bleed valve.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
29-11-30
ALL ú ú 01 Page 503 ú Jan 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
(h)
Remove the air pressure gage from the GA port on the reservoir pressurization module.
(i)
Install a plug and O-ring in the GA gage port on the reservoir pressurization module.
S 415-022
(7)
Close the access doors, if they are open (AMM 06-41-00/201).
S 865-014
(8)
If you used the pneumatic system to pressurize the reservoirs, remove pneumatic power (AMM 36-00-00/201).
NOTE: The pneumatic power must stay off during this test, after the
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