C. Prepare for the Operational Test
S 865-002
(1) Make sure these switches, on the hydraulic control panel, are in the OFF position:
(a)
L and R HYD PUMPS ELEC
(b)
C HYD PUMPS ELEC 1 and 2
(c)
L and R HYD PUMPS ENG
S 865-003
(2)
Make sure the RESERVE BRAKE switch, on the captain's main instrument panel, P1, is in the OFF position.
(3)
Supply electrical power (AMM 24-22-00/201)
S 865-004
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
HYDRAULIC SYSTEM PILOTS OVERHEAD
CONTROL PANEL
Hydraulic System Control Panels
Figure 501
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757
MAINTENANCE MANUAL
S 865-005
CAUTION: YOU MUST PRESSURIZE THE RESERVOIR IN THE CENTER HYDRAULIC
_______ SYSTEM BEFORE YOU OPERATE THE ALTERNATING CURRENT MOTOR PUMPS (ACMP) IN THE CENTER HYDRAULIC SYSTEM. IF YOU OPERATE AN ACMP WITHOUT PRESSURE IN THE RESERVOIR, DAMAGE TO THE ACMP CAN OCCUR.
(4) Pressurize the reservoir in the center hydraulic system, if the engine bleed air will not pressurize the pneumatic system subsequently in this test (AMM 29-11-00/201).
S 215-006
CAUTION: DO NOT OPERATE THE HYDRAULIC PUMPS AFTER THE HYDRAULIC
_______ TEMPERATURE INDICATION ON EICAS IS MORE THAN 100°C (212°F) OR AFTER THE PUMP OVERHEAT LIGHT COMES ON. IF YOU CONTINUE TO OPERATE THE PUMPS, THE HYDRAULIC FLUID CAN BECOME TOO HOT.
(5)
Make sure there is not less than 600 gallons (4020 pounds/1827 kilograms) of fuel in each main fuel tank.
S 865-007
(6)
If the fuel tank contains less than 4020 pounds of fuel, do these steps:
(a)
Stop the operation of the pump if the hydraulic temperature indication on EICAS is more than 100°C (212°F) or if the pump overheat light comes on.
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