2.3.3. WORK SWITCH
The WORK switch, when placed in the INT position, permits the crew member
access to the intercom channel. In positions A, B, C, D, E, and F if access is
permitted, the crew member can communicate over the selected radio by use of
the momentary PTT switch.
FULL FUNCTION CREW STATION (FFCS)
Figure 2-11. WORK Control Switch of FFCS