5965-01-017-8741 (MX-1646B/AIC)
5965-01-017-8741 is equivalent to manufacture part number 121-4000. It is a headset-microphone adapter and is classified under Federal Supply Class 5965 (5965 - Headsets, Handsets, Microphones and Speakers), stocked for defense, aerospace, MRO, and industrial maintenance applications. This item is cataloged in the NATO supply system under 5965 - Headsets, Handsets, Microphones and Speakers and is available through NSN-PARTS for U.S. government MRO, and commercial procurement.