(a)  
Push each rudder pedal and make sure it moves freely to its full travel position.

 (b)  
Release the rudder pedals.

 S 865-010
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. THE AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (5)  
Pressurize the hydraulic systems No. 1, 2, 3, and 4 (AMM 29-11-00/201).

 S 715-011

 (6)  
Do these steps to make sure the hydraulic supply shutoff valves are closed.

 (a)  
Make sure the VALVE CLOSED lights for the four TAIL switches are on.

 (b)  
Move the rudder pedals. 1) Make sure the upper and lower rudders do not move.

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747-400 MAINTENANCE MANUAL
 S 715-012
 (7)  
Do these steps to do a test of the upper rudder.

 (a)  
Find the switches for the FLT CONTROL HYD POWER on the Pilots' Overhead Maintenance Panel, P461. 1) Put the TAIL switch 1 in the NORM position.

 NOTE: Keep the TAIL switches 2, 3, and 4 in the SHUTOFF
____
 position.

 a)  Make sure the VALVE CLOSED light for TAIL switch 1 goes off.
 (b)  
Move the rudder pedals and make sure the upper rudder moves smoothly in the correct direction. 1) Make sure the rudder can move to its full travel positions. 2) Make sure the rudder position shows correctly on the flight

 controls maintenance page of EICAS.

 (c)  
Put the TAIL switch 3 in the NORM position and TAIL switch 1 in the SHUTOFF position. 1) Make sure the VALVE CLOSED light for TAIL switch 3 goes

 off. 2) Make sure the VALVE CLOSED lights for TAIL switches 1, 2, and 4 are on.

 (d)  
Move the rudder pedals and make sure the upper rudder moves smoothly in the correct direction. 1) Make sure the rudder can move to its full travel positions. 2) Make sure the rudder position shows correctly on the flight

 controls maintenance page of EICAS.
 S 715-013
 (8)  
Do these steps to do a test of the lower rudder.

 (a)  
Put the TAIL switch 2 in the NORM position and TAIL switch 3 in the SHUTOFF position. 1) Make sure the VALVE CLOSED light for TAIL switch 2 goes

 off.
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747-400 MAINTENANCE MANUAL
 2)  Make sure the VALVE CLOSED lights for TAIL switches 1, 3, and 4 are on.
 (b)  
Move the rudder pedals and make sure the lower rudder moves smoothly in the correct direction. 1) Make sure the rudder can move to its full travel positions. 2) Make sure the rudder position shows correctly on the flight

 controls maintenance page of EICAS.

 (c)  
Put the TAIL switch 4 in the NORM position and TAIL switch 2 in the SHUTOFF position. 1) Make sure the VALVE CLOSED light for TAIL switch 4 goes

 off. 2) Make sure the VALVE CLOSED lights for TAIL switches 1, 2, and 3 are on.

 (d)  
Move the rudder pedals and make sure the lower rudder moves smoothly in the correct direction. 1) Make sure the rudder can move to its full travel positions. 2) Make sure the rudder position shows correctly on the flight

 controls maintenance page of EICAS.
 S 715-014
 (9)  
Do these steps to do a test of the rudder trim system (Fig. 504).

 (a)  
Put all four of the TAIL switches in the NORM position.

 (b)  
Shake the rudder pedals to make sure the rudder is in the center position.

 (c)  
Use the rudder trim switch to get the rudder trim indicator to show zero units.

 (d)  
Look at the EICAS status page for the flight controls.
　
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