27-21-13
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
S 422-061
(2)
Install the gasket plate (34) and the solenoid valve (21) on the RRCA.
S 422-062
(3)
Install the washers (36) and the screws (35) and torque to 27 to 32 pound-inches.
S 432-063
(4)
Install a lockwire on the screws.
K.
RRCA Electro-Hydraulic Servo Valve (EHSV) - Installation (Fig. 201)
S 432-064
(1)
Put lubricant on all of the screws (23) and the washers (24).
S 422-065
(2)
Install the gasket plate (25) and the EHSV (22) on the RRCA.
S 422-066
(3)
Install the washers (24) and the screws (23) and torque them to 27 -32 pound-inches (3.6 newton-meters).
S 432-067
(4)
Lock the screws with wire.
S 822-079
(5)
Do the Rudder Ratio Changer Actuator - Oscillation Check
(AMM 27-21-00/501).
S 822-068
(6)
Adjust the rudder ratio changer LVDT (Ref 27-21-00).
L.
Rudder Ratio Changer Actuator (RRCA) - Test
S 212-097
(1) Make sure rig pin R3 (for the feel, centering, and trim mechanism) is installed.
S 862-069
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.
(2) Supply power to the left hydraulic system (Ref 29-11-00).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-21-13
ALL ú ú 01 Page 211 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
(3) S 862-070Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel: (a) 11D18 or 11G10, RUD RATIO (b) 11H17, FLT CONT SHUTOFF TAIL LEFT
(4) S 862-071Remove the DO-NOT-OPERATE tag and move the FLT CONTROL SHUTOFF L switch on the right side panel, P61, to ON.
(5) S 862-072Make sure these circuit breakers on the overhead panel, P11, are closed: (a) EICAS (6 locations)
(6) S 862-073Push the STATUS switch on the display select panel, P9, to show the rudder position indicator on the bottom EICAS display.
(7) S 862-074Move the test switch on one of the rudder ratio changer modules (RRCM), on the E3 or E4 equipment shelf, to TEST. Do these checks: (a) Make sure the RRCA extends fully. (b) Make sure the TEST FAIL fault ball stays black. If the fault ball does not stay black, then adjust and do a test of the ratio changer system (Ref 27-21-00).
NOTE:____ Permit 30 seconds for full actuator travel.
(c) (d) Observe the RRCA and Rudder Ratio Changer Output Arms for oscillations. If oscillations are noted, troubleshoot and correct the oscillation to complete this procedure.Make sure that rig pins R5 and R6 can be easily installed and removed at the same time.
(8) S 862-076Move the RRCM test switch to NORMAL and do these checks: (a) Make sure the RRCA retracts fully.
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757 MAINTENANCE MANUAL
(b) Make sure the TEST FAIL fault ball stays black. If the fault ball does not stay black, then adjust and do a test of the ratio changer system (AMM 27-21-00/501).
NOTE: Permit 30 seconds for full actuator travel.
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