FLC OF AN SMT FAILED TO FOLLOW THE MISSED APCH PROC RESULTING IN NOT ADHERING TO THE PUBLISHED TRACK AND ALT.

Narrative

AFTER THE CAPT SHOT AN AUTOPLT COUPLED ILS APCH TO COATESVILLE; PA AND MISSED HE CALLED FOR ME TO CONTACT CTR AND RELAY THAT WE WERE ON THE MISSED APCH WHILE HE STAYED ON UNICOM FREQ. IN THE MOMENTS THEREAFTER THE ACFT DEVIATED FROM HDG AND ALT ASSIGNMENT OF THE PUBLISHED MISSED APCH PROC. IN THOSE BRIEF MOMENTS THE CAPT HAD THOUGHT THAT HE HAD TRANSFERRED ACFT CTL TO ME; WHILE I THOUGHT HE WAS STILL FLYING THE ACFT WITH THE AUTOPLT. AT THIS BUSY MOMENT IN THE COCKPIT A GROSS MISCOM OCCURRED. IN RETROSPECT; WE LEARNED WE NEED TO POSITIVELY PASS CTL OF THE ACFT THROUGH THE CHALLENGE AND RESPONSE TECHNIQUE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE ACFT FLOWN DURING THIS INCIDENT WAS A BE90. HE SAID THAT IT TOOK A FEW MOMENTS TO REALIZE THAT THE AUTOPLT WAS NOT ENGAGED SINCE THE LAST THAT HE REMEMBERED SEEING IS THE INDICATIONS OF THE COUPLED APCH FROM WHICH THE MISSED APCH WAS BEING MADE. HE DID NOTICE THE GAR FLT DIRECTOR LIGHT ON AND THEN HIS ATTN WAS DIVERTED TO CONTACTING APCH CTL. HE FURTHER STATED THAT HE AND THE CAPT LEARNED A GOOD LESSON WITH REGARD TO FLC COMMUNICATING WITH EACH OTHER. HE HAS NOT FLOWN THE SAME CAPT SINCE SO CANNOT SAY HOW AFFECTIVE THE INCIDENT WAS TO THE CAPT'S FUTURE HABITS!