S 865-175
(11)
Remove the power from the left, right, and center hydraulic systems (AMM 29-11-00/201).
R.
Elevator PCU Monitor System Test
S 865-176
(1)
Do the steps that follow to prepare for the elevator PCU monitor system test:
(a)
Make sure that these circuit breakers on the P11 panel are closed: 1) 11C12, STAB TRIM SHUTOFF LEFT 2) 11C13, STAB TRIM SHUTOFF RIGHT 3) 11H17, FLT CONT SHUTOFF TAIL LEFT 4) 11H18, FLT CONT SHUTOFF TAIL CTR 5) 11H28, FLT CONT SHUTOFF TAIL RIGHT
(b)
Make sure that the L, R, and C FLT CONTROL SHUTOFF switches on the P61 panel are at the ON position.
(c)
Make sure that the RIGHT and CENTER STAB TRIM SHUTOFF valve switches on the P10 panel are in the NORM position.
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES
_______ WHEN HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZER ARE FULLY POWERED SURFACES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
(d)
Pressurize the left, right, and center hydraulic systems (AMM 29-11-00/201).
(e)
Supply electrical power (AC and DC) (AMM 24-22-00/201).
(f)
Move the horizontal stabilizer to between 5 and 7 units of trim on the stabilizer position indicator.
(g)
Make sure that these circuit breakers on the P11 panel are closed: 1) EICAS (6 locations) 2) 11A10, AIR DATA CMPTR LEFT 3) 11A11, AIR DATA AOA SENSOR LEFT 4) 11A12, AIR DATA BARO CORRECT LEFT 5) 11C30, LANDING GEAR POS SYS 1 6) 11F30, AIR DATA CMPTR RIGHT 7) 11F31, AIR DATA AOA SENSOR RIGHT 8) 11F32, AIR DATA BARO CORRECT RIGHT 9) 11J10, PCU MON SENSOR 10) 11J11, PCU MON MOD 11) 11S15, AIR/GND SYS 1 12) 11S19, AIR/GND SYS 2 13) 11S23, POS SYS 2
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL
S 725-177
(2) Do the steps that follow for the PCU monitoring of left outboard PCA test:
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FORM ALL CONTROL SURFACES
_______ WHEN HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZER ARE FULLY POWERED SURFACES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED. THE HYDRAULIC SYSTEMS ARE POWERED FOR THIS TEST.
(a)
Disconnect the electrical connectors from the middle and inboard PCAs.
(b)
Attach the electrical connectors to the test box.
NOTE: If the test box for the PCU monitoring test is not
____ available, connect a 750-ohm, 10-watt resistor between pin 1 and pin 2 at each PCA electrical connector (at the inboard and middle PCAs).
(c)
Erase the EICAS memory (AMM 31-41-00/201).
(d)
Make sure that the L ELEV PCU message is not shown on the EICAS display.
(e)
Use the pogo rod compression tool to compress the pogo rod on the outboard PCA 0.20 to 0.25 inches (5.1 to 6.4 mm).
(f)
Put the computer select switch on the P9 panel to L.
(g)
Make sure that the L ELEV PCU message is shown on the EICAS display.
(h)
Put the computer select switch on the P9 panel to R.
(i)
Make sure that the L ELEV PCU message is shown on the EICAS display.
(j)
Put the computer select switch on the P9 panel to AUTO.
(k)
Remove the pogo compression tool from the outboard PCA pogo.
S 725-178
(3)
Do the steps that follow to do a test for the PCU monitoring of the left middle PCA:
(a)
Disconnect the middle PCA connector from the test box (or the resistor).
(b)
Attach the middle PCA connector to the PCA.
(c)
Disconnect the electrical connector from the outboard PCA.
(d)
Attach the electrical connector to the test box.
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