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757
MAINTENANCE MANUAL
(8) S 985-199Put the EICAS computer select switch in the L position.
(9) S 285-200Make sure that the L YAW DAMPER message is not shown on the upper EICAS display.
S 865-201
(10) Open this circuit breaker on the P11 panel:
(a) 11F34, YAW DAMPER RIGHT
S 285-202
(11)
Make sure that the YAW DAMPER INOP R light is on, and that the yellow R YAW DAMPER message is shown on the upper EICAS display.
S 985-203
(12)
Put the EICAS computer select switch in the R position.
S 285-204
(13)
Make sure that the upper EICAS display shows the R YAW DAMPER message in yellow.
S 865-205
(14)
Close this circuit breaker on the P11 panel:
(a) 11F34, YAW DAMPER RIGHT
S 285-206
(15)
Stop for a minimum of 30 seconds then make sure that the YAW DAMPER INOP R light is off, and the R YAW DAMPER message is not shown on the upper EICAS display.
S 985-207
(16)
Put the EICAS computer select switch in the L position.
S 285-208
(17)
Make sure that the R YAW DAMPER message is not shown on the upper EICAS display.
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757 MAINTENANCE MANUAL
I. Air/Ground System Interface Test
NOTE: There shall be no Rudder Pedal movement or Rudder Trim Switch
____
operation during this test.
S 865-381
WARNING: PREPARE THE SAFETY-SENSITIVE SYSTEMS FOR THE AIR MODE BEFORE
_______ YOU OPEN THE AIR/GROUND CIRCUIT BREAKERS. IN THE AIR MODE, MANY OF THE AIRPLANE SYSTEMS CAN OPERATE AND CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(1)
Prepare the safety sensitive systems for air mode simulation (Ref 32-09-02/201).
S 865-783
(2)
Make sure that the AOA Vanes are set to equal postions.
NOTE: If the AOA Vane's are not equal:
____ -The "YAW DAMPER" EICAS maintenance message will show.
-A "ADC DIF" YDM fault meassage will occur.
S 985-385
(3)
Push the ECS/MSG switch on the EICAS Maintenance Panel (P61).
S 285-386
(4)
Make sure that the "YAW DAMPER" message is not displayed on the Lower EICAS Display - Maintenance Page.
S 285-387
(5)
Make sure that the "L YAW DAMPER" and "R YAW DAMPER" messages are not displayed on the Upper EICAS Display.
S 865-209
(6)
Open these circuit breakers on the P11 panel:
(a)
11C30, LANDING GEAR POS SYS 1
(b)
11S19, AIR/GND SYS 2
S 985-210
(7)
Put the YAW DMPR test switch on the P61 panel in the L position, then the R position, and then put it back to the center position.
S 285-211
(8)
Make sure that the YAW DAMPER L and R INOP lights on the YAW DAMPER Control Panel (P5) are off.
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757 MAINTENANCE MANUAL
S 985-388
(9)
Push the DISPLAY STATUS switch on the EICAS Display Control Panel (P9).
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