E.  
Put the Airplane Back to Its Usual Condition

 (1)  
Move the FLT CONTROL A switch to ON.

 S 865-020

 (2)  
Remove the hydraulic power systems A and B from the rudder system (AMM 27-21-00/201).

 S 865-006
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 S 085-021
 (3)  Remove the lockout pin from the nose gear steering (AMM 32-00-01/201).
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 RUDDER POWER CONTROL UNIT - INSPECTION/CHECK
____________________________________________
 1.  General_______
 A.  There is one task in this procedure, an inspection of the rudder power control unit (PCU). To do the inspection you measure the diameters of the parts that attach the PCU to the structure.
 TASK 27-21-91-226-001
 2.  Rudder Power Control Unit Inspection____________________________________
 A.  Standard Tools and Equipment
 (1)  
Micrometer - 0 to 1 inch

 (2)  
Micrometer - 1 to 2 inch

 (3)  
Vernier Caliper

 B.  
References

 (1)  
27-21-91/401, Rudder Power Control Unit

 C.  
Access

 (1)  
Location Zone
 706 Vertical Stabilizer

 D.  
Procedure

 S 026-002
 (1)
Remove the rudder power control unit (Ref 27-21-91/401).

 S 226-003

 (2)  
Examine the parts that attach the PCU (Fig. 601):

 (a)  
Remove the parts.

 (b)  
Use a micrometer or a vernier caliper to measure the parts.

 (c)  
Compare the dimensions you measured with the permitted dimensions shown in Fig. 601.

 (d)  
Repair or replace the parts that are not in the tolerance.

 (e)  
Install the parts.

 (3)
Install the rudder power control unit (Ref 27-21-91/401).

 S 426-004
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737-300/400/500MAINTENANCE MANUAL
POWER CONTROL
UNIT
SEE A

B
B
A
A C
A
C
A
FWD
POWER CONTROL UNIT
A
Rudder Power Control Unit Wear Limits Figure 601 (Sheet 1)
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2. ROD END/BOLT

A-A

B-B  C-C
Rudder Power Control Unit Wear Limits Figure 601 (Sheet 2)
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A 737-300/400/500MAINTENANCE MANUAL
INDEX NO.  PART NAME  DIM.  DESIGN LIMITS  WEAR LIMITS  REPLACE PART WORN  REPAIR WORN PART  REPAIR INSTR 
　
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