Brief Description: Added stiffner to seat back, and center seat back
1. Removed rear seat panel 6B5-1 from aircraft. 2. Located seat panel angle 6B16-5. 3. Marked clearance cutout for lightening hole on 6B16-5. 4. Cut clearance area. 5. Marked rivet pattern on rear seat panel for panel angle, leaving no rivet zone for center seat back channel. 6. Marked rivet zones on center seat back channel, and area to be removed. 7. Cut and removed area from center seat back channel. 8. Aligned center seat back channel on rear seat panel, and marked cut out area for lightening hole. 9. Removed lightening hole area on band saw; filed smooth. 10. Marked and punched key rivet locations on center seat back channel. 11. Drilled key rivet locations on center seat back channel with #40 bit. 12. Aligned center seat back channel on rear seat panel. 13. Back drilled key rivet locations with #40 bit. 14. Removed center seat back channel, and clamped seat panel angle to rear seat panel. 15. Drilled attach rivet holes for seat panel angle and rear seat panel with #40 bit, clecoing as holes were made. 16. Opened attachment rivet holes between set panel angle and rear seat panel with #20 bit for A5 rivets. 17. Reinstalled rear seat back panel in aircraft. 18. Installed center seat back channel in aircraft, opening holes with #20 bit for A5 rivets.
