Ici
https://www.defenseindustrydaily.com/mfta-the-us-navys-new-towed-array-for-naval-detection-04956/
ils donnent cela
The new AN/SQR-20 (now TB-37U) MFTA is the first new surface ship array to be built for the U.S. Navy in 25 years, and is configured as a long 3″ diameter array that can be towed behind surface ships. It is an active and passive sonar sensor, meaning it can listen silently for enemy submarines, or can send out a an active sonar ping and listen for the echoes. MFTA provides several enhancements over the existing AN/SQR-19 TACTAS, including better coverage, better detection capability, and better reliability.
Donc à priori la flûte peut tout aussi bien recevoir qu'émettre. D'où le "multi-fonctions"
Et là
https://www.militaryaerospace.com/sensors/article/14168975/towedarray-sonar-surface-warships-and-submarines
ils donnent
The TB-37U MFTA is an active and passive sonar. It can remain silent and simply listen for the sounds of enemy submarines, or it can ping active to bounce sound off the hulls of submarines in the area.