(c)
On the P71-00 panel:
1) HMG INST XFR BUS
2) HMG L XFR BUS
3) HMG R XFR BUS
4) HMG BAT CHGR
5) HYD GEN AC VOLT SENSE
D. Procedure
S 712-020
(1) Do a test of the hydraulic flow limiter.
(a)
Make sure that the trailing edge flaps and the leading edge slats are in the fully retracted position.
(b)
Fill the HMG accumulator with dry nitrogen to a specified pressure as shown on the placard.
NOTE: On airplanes with Vickers 10 KVA HMG, the placard is
____ on the central hydraulics bay door which is adjacent to the accumulator charging point.
On airplanes with Abex 5 KVA HMG, the placard is on the aft keel beam of the left wheel well.
(c) Make sure all the hydraulic system pressures are zero psig.
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(d)
(e)
(f)
(g)
(h)
(i)
(j)
(k)
(l)
(m)
757 MAINTENANCE MANUAL
Make sure the EICAS Maintenance Page HYD QTY shows 0.75 or more for the left and right system reservoirs.Pressurize the right hydraulic system with the right engine-driven pump or a hydraulic ground cart (AMM 29-11-00/201).Move the PTU manual control switch S1 which is on the P5 Pilot's overhead panel (or S7 on the P61 right side panel as applicable) to the ON position. 1) Make sure that the PTU operates. 2) Make sure the EICAS Maintenance Page shows 2600 psig or
more for the left hydraulic system.Move the GRD PROX/HYD GEN switch on the miscellaneous test panel M10398 to the HYD GEN position and hold it in its position. 1) Make sure that the EICAS Maintenance Message HYD GEN DC-V
shows between 24 and 32 volts. 2) Make sure that the EICAS Maintenance Message HYD GEN AC-V shows between 113 and 123 volts. 3) Make sure that the EICAS Maintenance Message HYD GEN FREQ
shows between 395 and 405 Hz.Move the flap control lever on the flight deck control stand to the 5 degree position. 1) Make sure that the left system hydraulic pressure stays
between 2300 and 2825 psig during the movement of the flaps and slats. 2) Make sure that the HMG does not stop before the flaps are
extended to the 5 degree position.Move the flap control lever to the zero (flap up) position. 1) Make sure that the left system hydraulic pressure stays
between 2300 and 2825 psig during the movement of the flap. 2) Make sure the HMG does not stop before the flaps and slats
are in the fully retracted position.Release the GRD PROX/HYD GEN switch.Move the PTU manual control switch S1 on the P5 panel or S7 on the P61 panel (as applicable) to the OFF position.Release the pressure in the right hydraulic system to zero psig (AMM 29-11-00/201).Put the airplane back to its usual condition.
WARNING:_______ OBEY THE REMOVAL PROCEDURE FOR THE DOOR LOCKS. THE
DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE
DOORS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO
EQUIPMENT.
1) Remove the door locks from the landing gear doors and close the landing gear doors (AMM 32-00-15/201).
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757 MAINTENANCE MANUAL
AC GENERATION ANNUNCIATION - DESCRIPTION AND OPERATION
______________________________________________________
1. General_______
A. Electrical power system status is indicated by lights and EICAS messages on the flight deck.
2. Component Details (Fig. 1)_________________
A. Electrical System Control Panel
_______________________________
(1) Electrical system control panel M10063 is on pilots' overhead panel P5. The panel contains: two main GEN CONT switches with amber OFF lights, two guarded GEN DRIVE DISC switches with amber DRIVE lights, two BUS TIE switches with amber ISLN lights, two amber BUS OFF lights, an APU GEN CONT switch with an amber OFF light, an EXT PWR switch with white ON and AVAIL lights, and two UTILITY BUS switches with amber OFF lights.
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