on upgrades. Performed this work IAN' GIV AMM 34-02-04. Step: 16.1.2 Completed Note: Sent previously removed #1 ATC Transponder P/N 622-9210-309, S/N 1G8M, and #2 ATC Transponder P/N 622-9210-309, S/N 2376 to Rockwell Collins Wichita for ADS-B Out mod. Both transponders will become P/N 622-9210-409 af