NMAC. TCASII ALLEGEDLY PREVENTED MIDAIR.

Date: 1995-11 · Aircraft: B737-500

Anomalies: conflict-nmac|deviation-altitude-excursion-from-assigned-altitude|deviation-track-heading-all-types|deviation-discrepancy-procedural-clearance|other-unspecified

Synopsis

NMAC. TCASII ALLEGEDLY PREVENTED MIDAIR.

Narrative

WE HAD A TCASII RA. ACR X FLT DID NOT COMPLY WITH ATC INSTRUCTION. PERHAPS ATC WAS OVERLOADED DUE TO WX. WE FOLLOWED TCASII AND AVOIDED A COLLISION. OUR ACR Y TRAINING AND MY PREVIOUS GOV TCASII TRAINING IN 1986 OR 1987 LITERALLY SAVED OUR LIVES. ALSO OUR CRM TRAINING FROM CAPT A. ACR Y WAS INSTRUMENTAL IN THE EMER. THE ACR X ACFT TURNED AND CLBED INTO OUR FLT PATH. THE VOICE TAPES AND RADAR DATA ALONG WITH WX WILL ACCURATELY SHOW THE SIT. ON THE RADIO I INITIATED THE 'NEAR MISS' RPT. THEN CALLED ZDC; THEN WASHINGTON APCH. ALSO NOTIFIED DISPATCH DESK. I BELIEVE ATC 'LOST CTL' WHEN ACR X FAILED TO COMPLY WITH INSTRUCTIONS. ATC WAS OF LITTLE HELP; I FELT WE WERE ON OUR OWN. WE COULD NOT COMMUNICATE WITH ACR Y THROUGH COMMERCIAL RADIO. COMMERCIAL RADIO DID NOT ANSWER CALLS ON SEVERAL FREQS. WE RELAYED OUR MESSAGES THROUGH DCA ACR Y OPS TO DISPATCH. THAT WAS THE BEST WE COULD DO. WE HAD NO PRIOR WARNING CONCERNING WX AT DCA. I REQUESTED WX AS INDICATED ON THE TAPE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: WHILE BEING VECTORED FOR THE LDA RWY 18 APCH TO DCA; APPARENTLY ANOTHER ACR ACFT TURNED OPPOSITE TO ATC CTLR'S INSTRUCTIONS AS WELL AS COMMENCED A CLB WITHOUT CLRNC. THAT INFO WAS GATHERED FROM POST FLT COM WITH BOTH ZDC AND APCH CTL. THE WX AT THE TIME WAS NOT HAZARDOUS; BUT RPTR BELIEVES THE INTRUDER ACFT WAS MANEUVERING TO STAY OUT OF PERCEIVED BAD WX. RPTR ACFT RECEIVED TCASII RA AND COMMENCED A RAPID DSCNT. AIRSPD INCREASED TO 380 KTS IN THE RA DSCNT AND RPTR BECAME CONCERNED ABOUT THE PROX OF THE GND. RPTR SAYS THAT AT THAT POINT THE CTLR APPARENTLY PANICKED AND LITERALLY WAS UNABLE TO ISSUE CTLING INSTRUCTIONS. EXAMPLE -- CTLR TOLD RPTR ACFT TO TURN. RPTR SAID; 'WHICH WAY OR WHAT HDG?' CTLR SAID; 'WHATEVER YOU WANT.' RPTR SAID THAT THE CTLR WAS SO INEPT; HE TRIED TO RELAY INFO THROUGH ACARS; BUT UNSUCCESSFULLY. WX AT DCA WAS RPTED 1700 FT OVCST; VISIBILITY 6 MI IN RAIN AND FOG; BUT RPTR SAYS IT WAS MUCH WORSE THAN THAT; SO RPTR DIVERTED TO EWR. NO INJURIES OR DAMAGE WERE RPTED AS A RESULT OF THE SUDDEN; HARD PUSHOVER.

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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.