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A
747-400
MAINTENANCE MANUAL

RUDDER RATIO CHANGER SEE A
SEE B 1. RUDDER RATIO CHANGER  8. WASHER 6. BONDING 7. BOLT 9. NUT JUMPER 
5. RATIO CHANGER SERVO 
4. ELECTRICAL CONNECTOR 
3. OUTPUT CONTROL ROD  ROD CONTROL 2. INPUT 
A RUDDER RATIO CHANGER 
Figure 202 (Sheet 1) Ratio Changer Servo 

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MAINTENANCE MANUAL

5. RATIO CHANGER SERVO
1. RUDDER RATIO CHANGER
AA
B
B
TRUNNION CRANK
RATIO CHANGER TRUNNION
RUDDER RATIO CHANGER
B
5. RATIO CHANGER SERVO
10. BOLT
16. WASHER
11. BUSHING
13. NUT
5. RATIO CHANGER SERVO
12. WASHER
15. BOLT
13.
 NUT

14.
 BUSHING

A-A
TRUNNION CRANK
B-B
Ratio Changer Servo Figure 202 (Sheet 2)
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 TASK 27-21-12-422-057
 6.  Ratio Changer Servo Installation (Fig. 202)________________________________
 A. Special Tools and Equipment
 (1)
G12001-50, Rig Pin Kit

 B.
Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 202 | 5 | Servo Unit | 27-21-12 | 03 | 210 | | | 7 | Bolt | 27-21-15 | 02 | 5 | | | 8 | Washer | | | 10 | | | 9 | Nut | | | 20 | | | 10 | Bolt | 27-21-12 | 03 | 20 | | | 11 | Bushing | | | 205 | | | 12 | Washer | | | 45 | | | 13 | Nut | | | 50 | | | 14 | Bushing | | | 205 | | | 15 | Bolt | | | 30 | | | 16 | Washer | | | 40 | 2......…........…...................................…...........….....…........1

 C.
References

 (1)
AMM 06-09-07/201, Fin and Rudder Access Doors and Panels

 (2)
AMM 24-22-00/201, Manual Control

 (3)
AMM 27-21-12/501, Rudder Ratio Changer

 D.
Access

 (1)  
Location Zone 324 Vertical Stabilizer, Rear Spar to Trailing Edge 325 Lower Rudder 326 Upper Rudder

 (2)  
Access Panel
 324DL Inspection Access Panel
 324UL Inspection Access Panel

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 E.  Procedure
 S 422-035
 (1)  
Install the servo unit (5).

 (a)  
Make sure the bushings (11) and (14) are not worn.

 (b)  
Connect the servo unit (5) to its fitting. 1) Install the bolt (10), washer (12), and nut (13).

 (c)  
Put the RRC servo unit (5) in its correct position.

 (d)  
Install the bolt (15), washer (16), and nut (13) that connect the servo unit to the trunnion crank.

 (e)  
Install the bolt (7), washer (8), and nut (9) that connects the bonding jumper (6) to the servo unit (5).

 (f)  
Connect the electrical connector to the servo unit (5).

 F.  
Put the Airplane Back to Its Usual Condition

 S 412-042
 (1)
Close the access panels 324DL, 324FL, and 324UL (AMM 06-09-07/201).
　
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