27-21-12
ALL ú ú 01 Page 212 ú Feb 18/01
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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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27-21-12
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
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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A
747-400 MAINTENANCE MANUAL
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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747-400 MAINTENANCE MANUAL
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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