A VMC EMB120 ON AN INST APCH HAD AN NMAC WITH A FORMATION OF SEVERAL T6'S AND A DC3 FOLLOWED BY A SECOND NMAC WITH A SOLO T6.

Narrative

AFTER WX FELL BELOW MINIMUMS AT ZZZ1; WE DIVERTED TO ZZZ2. WHILE ON APCH TO RWY XXR AT ZZZ2; WE RECEIVED A TA FROM THE TCASII. THE TFC WAS A FORMATION OF 4 OR 5 ACFT AT 12 O'CLOCK POS MOVING TO 1 O'CLOCK POS; OPPOSITE DIRECTION; AND SAME ALT. THE CAPT WAS FLYING SO I ADVISED THAT WE NEEDED TO BANK L. AS THE FORMATION PASSED OUR 1-2 O'CLOCK POS; OPPOSITE DIRECTION; AND SAME ALT. THE CAPT WAS FLYING SO I ADVISED THAT WE NEEDED TO BANK L. AS THE FORMATION PASSED OUR 1-2 O'CLOCK POS; ZZZ2 APCH CALLED OUT THE TFC TO US AND CLRED US TO LOWER ALT. I ADVISED APCH OF THEIR CLOSE PROX. IMMEDIATELY WE RECEIVED ANOTHER TA FROM THE TCASII. I IDENTED A LONE T-6 AT 12 O'CLOCK POS COMING STRAIGHT TOWARD US AND ADVISED THAT WE DIVE. THE CAPT MADE A STEEP DIVING R TURN MISSING THE T-6 AND PUTTING US JUST BEHIND AND BELOW THE FORMATION. WHILE AVOIDING THE T-6 AND AFTER THE TCASII ADVISORY; ZZZ2 APCH CALLED OUT THE ADDITIONAL TFC AND ADVISED TO EXPEDITE OUR DSCNT. AS WE PASSED BEHIND THE FORMATION; WE ENCOUNTERED TURB FROM THE PROP WASH AND SOON AFTER THE CAPT ADVISED ME THAT THE R ENG HAD FLAMED OUT. WE EXECUTED MEMORY ITEMS AND VERIFIED THAT THE ENG WAS FEATHERED. I FINISHED SECURING THE ENG FOLLOWING THE QRH. NOW ON A CLOSE FINAL FOR RWY XXR; WE DECIDED THAT IT WAS SAFEST TO CONTINUE LNDG WITH THE R ENG SECURED. AFTER LNDG; WE RESTARTED THE ENG AND VERIFIED THAT ALL OPS WERE NORMAL. ONCE WX IN ZZZ1 CLRED; WE RETURNED WITHOUT FURTHER INCIDENT. ONCE ON THE GND AT ZZZ2; THE CAPT ASKED FOR THE TWR'S PHONE NUMBER AND CALLED THE TWR SUPVR. BOTH THE CAPT AND MYSELF AGREE THAT HAD WE NOT RECEIVED THE TA FROM THE TCASII AND TAKEN EVASIVE ACTION; A MIDAIR COLLISION WOULD HAVE OCCURRED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: ATTEMPTING TO CLARIFY THE CLUSTER OF ACFT INVOLVED; THIS ANALYST CALLED THE RPTR. THE RPTR STATED THAT THE DC3 WAS IN FORMATION WITH A CLUSTER OF T6'S. AFTER THE FIRST NEAR MISS EVASIVE ACTION; THEY ENCOUNTERED AND EVADED A SOLO T6 FOLLOWING THE FORMATION. HE STATED THAT AN AIRSHOW WAS EITHER IN PROGRESS OR ABOUT TO BEGIN AND THAT THE TWR WAS ACTING AS BOTH APCH AND TWR LCL TFC CTL WORKING HIS FLT AND THE AIRSHOW ACFT WITH WHOM THEY NEARLY COLLIDED. THIS PLT STATED THAT IT WAS HIS IMPRESSION THAT THE CTLR WAS WATCHING THE AIRSHOW ACFT AND BECAME DISTR BY THAT ACTIVITY. THE RPTR STATED THAT THEY WERE VERY CLOSE TO THE OTHER ACFT.