TM 10-3930-669-20 15-16.  SEAT REPLACEMENT/REPAIR (CONT). (12) Install cushion (3) on seat assembly (1) until four tabs (2) snap in place. NOTE Follow-on Maintenance: · Remove wheel chocks (TM 10-3930-669-10). · Close cab door (TM 10-3930-669-10). END OF TASK 15-58