1)  Make sure that EICAS shows that the rudders are in their center positions.

 (e)  
Use the rudder trim switch to move the rudders to their fully left position.

 NOTE: Do not move the rudder pedals.
____
 (f)  
Look at the flight controls maintenance page of EICAS.

 1)  Make sure the rudders moved a minimum of 24 degrees to the left.

 (g)  
Use the rudder trim switch to move the rudders to their fully right position.

 NOTE: Do not move the rudder pedals.
____
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747-400 MAINTENANCE MANUAL
 (h) Look at the flight controls maintenance page of EICAS.
 1)  Make sure the rudders moved a minimum of 24 degrees to the right.
 G.  Put the Airplane Back to Its Usual Condition
 S 095-122
 (1) Remove rig pin E-1 from the captain's control column (Fig. 501).
 S 095-016
 WARNING:_______MAKE SURE THE NOSE LANDING GEAR IS POINTED FORWARD. IF THE TIRES ARE NOT PARALLEL WITH THE AIRPLANE, THEY CAN TURN QUICKLY WHEN YOU REMOVE THE TOW PIN. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  
Remove the TOW PIN from the nose landing gear.

 S 865-017

 (3)  
Remove hydraulic power (AMM 29-11-00/201).

 S 865-019

 (4)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 TASK 27-21-00-705-114
 3.  Rudder Ratio Changer Existing Faults Check__________________________________________
 A.  General
 (1)  
These are a test of the BITE functions of the rudder ratio changer. Use one of the two subsequent procedures to do a check for existing faults in the rudder ratio changer system.

 (2)  
The ADC-L Ground Test will be started automatically during this test to supply air speed data to the rudder ratio changers.

 (3)  
The tests make sure that the left or the right stabilizer trim rudder ratio modules (SRMs) can control the upper or the lower rudder changer system.

 (4)  
During the test, the rudder ratio changer actuators will move from the fully retracted to the fully extended position.

 B.  
References

 (1)  
AMM 24-22-00/201, Manual Control

 C.  
Access

 (1)  
Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

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747-400
MAINTENANCE MANUAL

 NOTE: Use one of the subsequent procedures to do a check for the existing
____ faults in the rudder ratio changer system.
 D. Procedure 1: (Airplanes with two SRM's P/N 285U0015-108 or later)
 S 865-145
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-165

 (2)  
Make sure the Air Data Switch on the Captain's SOURCE SELECT module is in the L position.

 S 865-164
 WARNING: MAKE SURE THE FLAP LEVER AND THE TRAILING EDGE (TE) FLAPS ARE
_______ 20 OR LESS. IF THE TE FLAPS ARE EXTENDED TO MORE THAN 20, THEY CAN MOVE AUTOMATICALLY DURING THE TEST AND CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (3)  
Make sure that the trailing edge (TE) flap lever is set to a position of 20 or less.

 S 865-146

 (4)  
Set the GND TEST switch on the overhead maintenance panel, P461, to the ENABLE position.

 S 865-153

 (5)  
Open and close these circuit breakers on the P7 panel:

 NOTE: This is to make sure that the left SRM controls the
____
 actuators.

 (a)  
FLT CONT ELEC 2RAC (C10265)

 (b)  
FLT CONT ELEC 2RDC (C10266)

 S 865-147
 (6)  
　
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