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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An IFR commuter aircraft was issued a descent clearance below a VFR PA28 at 2600 ft with traffic exchanged with both aircraft. The commuter aircraft received a TCASII RA on the PA28 while in descent, reversed course, and climbed through the PA28's altitude. The controller claims that the unnecessary TCASII RA turned a controled situation into a dangerous situation.
| Attributes | |
| ACN | 372123 |
| Time | |
| Date | 199706 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : hvn |
| State Reference | CT |
| Altitude | msl bound lower : 2600 msl bound upper : 2600 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 |
| Operator | common carrier : air carrier |
| Make Model Name | Jetstream 41 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | PA-28 Cherokee/Archer II/Dakota/Pillan/Warrior |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 7 flight time total : 450 |
| ASRS Report | 372123 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : took evasive action none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 200 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
BA41 inbound hvn tracking ILS runway 2. PA28 receiving VFR advisories, level 2600 ft wbound south of hvn. Cleared BA41 to cross sallt at 2000 ft, cleared ILS runway 2, called traffic '1 O'clock, 5 mi, wbound, cherokee at 2600 ft will cross above you, my control.' PA28 was going to cross ILS approach course 1 mi north of sallt. Also called traffic for PA28 and advised him that BA41 would cross underneath inbound hvn. Approximately 2 mi south of sallt, I observed BA41 at 2600 ft and climbing. I asked if he was responding to an RA. He said 'yes.' then he announced he was turning right to avoid traffic. This was a totally unnecessary RA, and it turned a controled situation into a very dangerous one. This is not the first time that I have had TCASII aircraft 'leap frog' crossing VFR traffic they had been advised of.
Original NASA ASRS Text
Title: AN IFR COMMUTER ACFT WAS ISSUED A DSCNT CLRNC BELOW A VFR PA28 AT 2600 FT WITH TFC EXCHANGED WITH BOTH ACFT. THE COMMUTER ACFT RECEIVED A TCASII RA ON THE PA28 WHILE IN DSCNT, REVERSED COURSE, AND CLBED THROUGH THE PA28'S ALT. THE CTLR CLAIMS THAT THE UNNECESSARY TCASII RA TURNED A CTLED SIT INTO A DANGEROUS SIT.
Narrative: BA41 INBOUND HVN TRACKING ILS RWY 2. PA28 RECEIVING VFR ADVISORIES, LEVEL 2600 FT WBOUND S OF HVN. CLRED BA41 TO CROSS SALLT AT 2000 FT, CLRED ILS RWY 2, CALLED TFC '1 O'CLOCK, 5 MI, WBOUND, CHEROKEE AT 2600 FT WILL CROSS ABOVE YOU, MY CTL.' PA28 WAS GOING TO CROSS ILS APCH COURSE 1 MI N OF SALLT. ALSO CALLED TFC FOR PA28 AND ADVISED HIM THAT BA41 WOULD CROSS UNDERNEATH INBOUND HVN. APPROX 2 MI S OF SALLT, I OBSERVED BA41 AT 2600 FT AND CLBING. I ASKED IF HE WAS RESPONDING TO AN RA. HE SAID 'YES.' THEN HE ANNOUNCED HE WAS TURNING R TO AVOID TFC. THIS WAS A TOTALLY UNNECESSARY RA, AND IT TURNED A CTLED SIT INTO A VERY DANGEROUS ONE. THIS IS NOT THE FIRST TIME THAT I HAVE HAD TCASII ACFT 'LEAP FROG' XING VFR TFC THEY HAD BEEN ADVISED OF.
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.