ATA "3411", as far as I can determine, is "AOA sensor" but I cannot determine what the numbers following "3411" mean - perhaps further details in the AF MEL.
2131 Cabin Pressure Controller
3410 Environmental Conditions
3411 Pitot-Static System
3412 Outside Air Temp
3422 Directional Gyro & Ind.
3443 Doppler
(JASC Standard Codes)