A COMMUTER DH8 RESPONDS TO A TCASII EVASIVE ACTION CLB FROM 3 VFR F16'S 500 FT BELOW IT AFTER DEPARTING A RESTR TRAINING AREA.

1997-07 · NASA ASRS report 375024

Date: 1997-07 · Aircraft: Dash 8 Series Undifferentiated or Other Model

Anomalies: conflict-airborne-conflict|other-unspecified

Synopsis

A COMMUTER DH8 RESPONDS TO A TCASII EVASIVE ACTION CLB FROM 3 VFR F16'S 500 FT BELOW IT AFTER DEPARTING A RESTR TRAINING AREA.

Narrative

THE DH8 WAS SBOUND ON V297 AT 11000 FT. A FLT OF 3 F16'S DEPARTED R-4201A SEBOUND VFR LOOKING TO PICK UP THEIR IFR CLRNC TO MTC. BEFORE I COULD ESTABLISH THE POS OF THE F16'S; THEY WERE 500 FT BELOW THE DH8. I AM SURE THAT THE RAPID RATE OF CLB BELOW THE DH8 SET OFF HIS TCASII. THE PLT OF THE DH8 TOLD ME OF THE TCASII AND HE WAS CLBING. THE F16'S HAD THE DH8 IN SIGHT. THIS SIT HAPPENS ALMOST EVERY DAY ALONG V297 BTWN PLN AND MBS. THIS AIRWAY IS SQUEEZED BTWN A NUMBER OF MIL AIRSPACES; RESTR AREAS TO THE W; MOA'S AND ATCA'S TO THE E. THIS LEAVES A VERY SMALL AREA FOR THE AIRWAY AND THE DEP POINT OF THE RESTR AREAS. I BELIEVE THAT THE MIL SHOULD DEPART TO THE S OF R-4201A&B AND NOT TO THE E OR SE AS TO CONFLICT WITH V297. IN MOST CASES; THE MIL ACFT PROVIDE THEIR OWN VFR SEPARATION USING THE ONBOARD RADAR. THE TCASII SLOWER MOVING ACFT CAN ONLY GUESS WHAT TO DO. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR INDICATED THE F16'S HAD CLBED AND WERE LEVEL AT 10500 FT AND HAD THE DH8 IN SIGHT WHEN THE TCASII ACTION WAS TAKEN BY THE DH8. IN DISCUSSION WITH THE ANALYST; THE RPTR INDICATED THIS SIT COULD HAVE OCCURRED WITH ANY OTHER VFR ACFT. RPTR IS UNAWARE OF ANY DISCUSSION TO HAVE THE MIL DEPART THE RESTR AREA TO THE E OR SE. RPTR STATED THAT THERE IS A PUSH TO GET THE MIL TO MAKE REAL TIME USE OF THE AREAS RATHER THAN BLOCKING THEM FOR CERTAIN NUMBER OF HRS WITHOUT ANY ACTIVITY. RPTR STATED THEY AND ADJOINING FACILITIES USE THE V297 AIRWAY RESTR WHICH PLACES TFC ON THE AIRWAY WHEN THE RESTR AREAS ARE ACTIVE. RPTR INDICATED THIS ELIMINATES THE NEED OF THE RPTR'S SECTOR TO VECTOR THE TFC AROUND THE VARIOUS MIL ACTIVITY AREAS AS DETAILED IN THE RPT.

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

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