Narrative:

After WX fell below minimums at ZZZ1, we diverted to ZZZ2. While on approach to runway xxr at ZZZ2, we received a TA from the TCASII. The traffic was a formation of 4 or 5 aircraft at 12 O'clock position moving to 1 O'clock position, opposite direction, and same altitude. The captain was flying so I advised that we needed to bank left. As the formation passed our 1-2 O'clock position, opposite direction, and same altitude. The captain was flying so I advised that we needed to bank left. As the formation passed our 1-2 O'clock position, ZZZ2 approach called out the traffic to us and cleared us to lower altitude. I advised approach of their close proximity. Immediately we received another TA from the TCASII. I idented a lone T-6 at 12 O'clock position coming straight toward us and advised that we dive. The captain made a steep diving right 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 approach called out the additional traffic and advised to expedite our descent. As we passed behind the formation, we encountered turbulence from the propeller wash and soon after the captain advised me that the right engine had flamed out. We executed memory items and verified that the engine was feathered. I finished securing the engine following the QRH. Now on a close final for runway xxr, we decided that it was safest to continue landing with the right engine secured. After landing, we restarted the engine and verified that all operations were normal. Once WX in ZZZ1 cleared, we returned without further incident. Once on the ground at ZZZ2, the captain asked for the tower's phone number and called the tower supervisor. Both the captain 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 reporter revealed the following information: attempting to clarify the cluster of aircraft involved, this analyst called the reporter. The reporter 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 tower was acting as both approach and tower local traffic control working his flight and the airshow aircraft with whom they nearly collided. This pilot stated that it was his impression that the controller was watching the airshow aircraft and became distraction by that activity. The reporter stated that they were very close to the other aircraft.

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Original NASA ASRS Text

Title: 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.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.