Subtask 27-21-49-860-056
 B. Aircraft Maintenance Configuration WARNING : MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES
_______ ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
 (1)
 Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).

 (2)
 Pressurize the Blue hydraulic system with the electric pump (Ref. TASK 29-10-00-863-003).

 (3)
 Put the rudder pedals in the neutral position.

 (4)
 On the center pedestal, on the panel 110VU, make sure that the RUD TRIM indicator shows zero.

 (5)
 On the overhead panel 23VU, release the FLT CTL/FAC 1 pushbutton switch. Make sure that the OFF legend comes on.

 (6)
 On the overhead panel 24VU, release the FLT CTL/FAC 2 pushbutton switch. Make sure that the OFF legend comes on.

 (7) Depressurize the Blue hydraulic system (Ref. TASK 29-10-00-864-003). Subtask 27-21-49-865-055
 C. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AUTO FLT/FAC1/28VDC 5CC1 B04 49VU AUTO FLT/FAC1/26VAC 14CC1 B03 121VU AUTO FLT/RUDDER/TRIM/IND 15CC M20 121VU AUTO FLT/FAC2/28VDC 5CC2 M19 121VU AUTO FLT/FAC2/26VAC 14CC2 M18
 Subtask 27-21-49-860-057
 D. Aircraft Maintenance Configuration
 (1)
 Make sure that the hydraulic systems are depressurized and put them in the maintenance configuration. (Ref. TASK 29-00-00-864-001).

 (2)
 De-energize the aircraft electrical circuits. (Ref. TASK 24-41-00-862-002)

 (3)
 Put the WARNING NOTICE in position to tell persons not to operate:

 -The flight controls
 -The Green, the Yellow or the Blue hydraulic systems. Subtask 27-21-49-010-051
 E. Get Access
 (1)
 Put the ACCESS PLATFORM 6M (20 FT) in position at the right side of the vertical stabilizer.

 (2)
 Open the access panel 325CR and remove the access panel 325BR (Ref. TASK 55-33-13-010-002).

 Subtask 27-21-49-480-051
 F. Installation of the Rigging Pins
 (Ref. Fig. 601/TASK 27-21-49-991-003)

 (1)
 Put the PIN - RIGGING (98D27207546000) (6) in the bellcrank assembly of the rudder servo control 1025GM (1).

 (2)
 Put the PIN - RIGGING (98D27207545000) (5) in the bellcrank assembly of the rudder travel-limitation unit 4CC.

 4. Procedure
_________ Subtask 27-21-49-280-050
 A. Measurement of the spring rods CAUTION : WHEN YOU DISCONNECT THE SPRING RODS, MAKE SURE THAT THE BEND
_______ ANGLE OF THE BEARING OF THE EYE-ENDS IS NOT MORE THAN 8 DEG. IF THE BEND ANGLE IS MORE THAN 8 DEG., DAMAGE CAN OCCUR TO THE PROTECTION FLANGE OF THE BEARING OR TO THE BEARING ITSELF.
 (1) Before you measure the applicable spring rod, you must disconnect the two remaining spring rods as follows:
 NOTE : It is recommended to do the procedure that follows from the RH
____
 side of the vertical stabilizer.

 NOTE : The removal procedure of the upper spring rod is given. The
____ removal procedures for the center spring rod and the lower spring rod are almost the same.
 (a) At the spring rod (1), (2) or (3):
 1_ Remove and discard the cotter pin (11).
 2_ Remove the nut (10), the washer (9), the bolt (7) and the
 distance bush (8).
 3_ Temporarily attach the spring rod to the adjacent structure
 with a TIE WRAP.

 (2)
 Disconnect the spring rod (4)

 (a)
 Remove and discard the cotter pin (15).

 (b)
 Remove the nut (16), the washer (17), the bolt (13) and the bush (14).

 (3)
 Do a check of the spring rod (1), (2) or (3) NOTE : It is recommended that you use a digital calliper to measure

____ the dimension "X".
 (a)
 Measure and record the dimension "X" of the spring rod (1).

 (b)
 Push the rod (4) until the spring rod (1) moves to its inner stop.

 (c)
 Release the rod (4). Make sure that the rod moves to its neutral position.

 (d)
 Measure and record the dimension "X" of the spring rod (1) again.

 (e)
 Pull the rod (4) until the spring rod (1) moves to its inner stop.

 (f)
 Release the rod (4). Make sure that the rod moves into the neutral position.

 (g)
 Measure and record the dimension "X" of the spring rod (1) again.
　
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