REMOVE YAW SPRING ASSEMBLY

INSTALL YAW, THRUST, ROLL OR PITCH VISCOUS DAMPER ARMS (Continued)

TM-55-1520-240-23-9 CH-47D Heilcopter Manual
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TM 55-1520-240-23-9 11-140 REMOVE YAW SPRING ASSEMBLY 11-140 INITIAL SETUP Applicable Configurations: All Tools: Aircraft Mechanic’s Tool Kit, NSN 5180-00-323-4692 Materials: Paper Tag (E264) Personnel Required: Medium Helicopter Repairer References: TM 1-1520-253-23 Equipment Condition: Battery Disconnected (Task 1-39) Electrical Power Off Hydraulic Power Off Closet Acoustic Blanket Removed (Task 2-107) Closet Backup Panel Removed (Task 2-2) Yaw Magnetic Brake at Neutral (TM 55-1520-240-T) NOTE If a crack in the bellcrank is suspected during removal, refer to TM 1-1520-253-23. 1. Tag yaw spring assembly (1). Remove cotter pin (2), nut (3), two washers (4), and bolt (5) from idler bellcrank (6). Disconnect spring from bellcrank. 2. Install bolt (5), two washer (4), and nut (3) loosely in bellcrank (6). 3. Remove cotter pin (7), nut (8), two washers (9), and bolt (10) from magnetic brake arm (11). Remove spring (1). 4. Install bolt (10), two washers (9), and nut (8) loosely in arm (11). FOLLOW-ON MAINTENANCE: None END OF TASK 11-605

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