S 862-061
(7) Close these circuit breakers on the P11 panel and push the RESET button on the front of left (right) yaw damper module:
(a)
11A18, YAW DAMPER LEFT
(b)
11F34, YAW DAMPER RIGHT
S 282-039
(8)
AIRPLANES WITH YDM -101 THRU -121; Any faultballs that do not reset show that there is a fault.
S 982-041
(9)
AIRPLANES WITH YDM -122 THRU -999; Push the DISPLAY button on the left (right) yaw damper module. If the message NO FAULTS is not displayed on the module, there is a fault.
S 982-043
(10)
Put the YAW DMPR test switch on the P61 panel in the L (R) position, then put it back to the center. Make sure that the YAW DAMPER L INOP light comes on in less than 15 seconds.
S 282-044
(11)
Make sure that the rudder position indicator on the lower EICAS display shows this sequence of rudder movement in less than 10 seconds:
(a)
The rudder moves approximately 3 degrees trailing edge right.
(b)
The rudder moves approximately 3 degrees trailing edge left.
(c)
The rudder goes back to the center.
S 282-045
(12) Make sure that the YAW DAMPER L (R) INOP light goes off in less than 15 seconds after the switch is put back to center.
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757 MAINTENANCE MANUAL
S 282-046
(13)
AIRPLANES WITH YDM -101 THRU -121;
No faultballs should be set during the test.
S 282-047
(14)
AIRPLANES WITH YDM -122 THRU -999; The NO FAULTS message should be the only message shown on the yaw damper modules after completion of this test if there are no faults.
C. Inspect for leakage.
S 982-050
(1)
Put the L, C, and R FLT CONTROL SHUTOFF switches in the OFF
position.
S 862-051
(2)
Open these circuit breakers on the P11 panel and attach DO-NOT-CLOSE tags:
(a)
11H17, FLT CONT SHUTOFF TAIL LEFT
(b)
11H18, FLT CONT SHUTOFF TAIL
(c)
11H28, FLT CONT SHUTOFF TAIL RIGHT
S 862-094
WARNING: MAKE SURE PERSONNEL STAY A MINIMUM OF 6 FEET AWAY FROM THE
_______ VERTICAL STABILIZER WHEN THE HF SYSTEM TRANSMITS. RF ENERGY FROM THE HF COMMUNICATION ANTENNA CAN CAUSE INJURIES TO PERSONNEL.
(3)
Make sure the HF system does not transmit.
S 282-052
(4)
Look for hydraulic leakage around the valves and correct as
necessary.
S 862-053
(5)
Close the service access panel, 324BL (AMM 06-42-00/201).
D. Restore Airplane To Normal
S 862-054
(1) Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
(a)
11C12, STAB TRIM SHUTOFF LEFT
(b)
11C13, STAB TRIM SHUTOFF RIGHT
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757 MAINTENANCE MANUAL
(c)
11G8, HF COMM LEFT
(d)
11G34, HF COMM RIGHT
(e)
11H17, FLT CONT SHUTOFF TAIL LEFT
(f)
11H18, FLT CONT SHUTOFF TAIL CENTER
(g)
11H28, FLT CONT SHUTOFF TAIL RIGHT
S 982-055
(2)
Put the L, C, and R FLT CONTROL SHUTOFF switches in the OFF position.
