ACR X NON ADHERENCE TO ATC CLRNC (RADAR VECTOR HDG) HAD LTSS FROM ACR Y. SYS ERROR.

Narrative

ACR X DEPARTED FROM BOSTON TO BANGOR; ME; ON AN IFR PLAN; CONDITIONS WERE VFR DEPARTING ENRTE AND AT THE DEST. I WAS THE PNF; THE FO WAS FLYING THE LEG FROM BOSTON TO BANGOR. AT ABOUT 500 FT MSL WE WERE INSTRUCTED TO CONTACT DEP ON FREQ 133.0. I SWITCHED FREQ AND WAS PROCEEDING WITH COCKPIT DUTIES AS NORMAL. AT ABOUT 900 FT MSL I CONTACTED DEP AND WAS INSTRUCTED TO TURN R A 090 HDG. THAT WAS DONE AND ALSO NOTED ACR Y AT OUR 9:00 POS AND THE JET ALSO HAD VISUAL CONTACT WITH OUR PLANE. WE WERE LATER VECTORED TO NW HDG AND CLRED ON COURSE AS FILED. WHEN RETURNING THAT AFTERNOON AS A PAX FROM BANGOR TO BOSTON I WAS ASKED TO CONTACT THE BOSTON APCH CTL FACILITY. I CALLED THEM AND THEY HAD TOLD ME THAT MIN SEPARATION HAD NOT BEEN MAINTAINED ON DEP. THEY SAID THAT THE TWR CTLR HAD INSTRUCTED A 010 HDG BUT NEITHER ONE OF US HAD HEARD THE HDG ONLY ACKNOWLEDGING THE HDOF FROM TWR TO DEP. ALSO THE ACR Y WAS NOT SQUAWKING THE APPROPRIATE CODE. ACR Y WAS ALSO INSTRUCTED TO TURN TO A CERTAIN HDG UPON REACHING THE 4 DME. THE BOSTON DME PART OF THE VOR WAS NOTAMED AS OTS THAT DAY.