The U-92 Jack is used for civilian helicopter cords and military aviation cords. This jack mates with the TP-120  or U-174 plug.

Wiring Configuration:

Microphone High to Pin 1

Earphone High to Pin 2

Microphone Low (and shield) to Pin 3

Earphone Low to Pin 4

Other items you may need:

TP-120 Cord Plug