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Air carrier responding to TCASII RA causes less than standard separation with a TCA small aircraft aircraft.
| Attributes | |
| ACN | 216396 |
| Time | |
| Date | 199207 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : msy |
| State Reference | LA |
| Altitude | msl bound lower : 5000 msl bound upper : 7200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : msy |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | None |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 5 controller non radar : 4 controller radar : 4 |
| ASRS Report | 216396 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : private |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Miss Distance | horizontal : 4500 vertical : 200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Small aircraft X was cleared into the TCA from the northeast to the southwest at 6500 ft. Air carrier Y was descending to 5000 ft. Air carrier Y's path was going to take him behind small aircraft X on I ts descent. Air carrier X's TCASII alerted the pilot that traffic was ahead and the pilot responded to the TCASII by climbing back to 7200 ft. As air carrier Y leveled and climbed, it gained horizontally on small aircraft X. Separation was then lost and pilot filed a near miss. If air carrier Y would have continued his normal descent he would have passed well behind and below of small aircraft X. Responding to the TCASII created the situation. The pilot did not advise the controller of his actions until he was leveling at 7200 ft. The concept of TCASII is good, but its applications can create a real hazard to flight safety. Air carrier Y almost ran over small aircraft X because of its actions. Supplemental information from acn 216550: while in contact with msy approach control we received a TCASII warning. Our position was 13 NM ene of the msy VOR descending to 5000 ft. Passing through 6500 ft we received an aural and visual TCASII warning. The target was very close horizontal and approximately 200 ft below us. The first officer immediately followed the TCASII evasion instructions to climb. The small high wing aircraft finally became visual to us at a distance of less than 1/2 mi from us at approximately 6000 ft. Were it not for the TCASII warning we would have had a near miss at best. The target did not show up on our TCASII until we were extremely close and approach apparently did not see him until we were out of danger.
Original NASA ASRS Text
Title: ACR RESPONDING TO TCASII RA CAUSES LTSS WITH A TCA SMA ACFT.
Narrative: SMA X WAS CLRED INTO THE TCA FROM THE NE TO THE SW AT 6500 FT. ACR Y WAS DSNDING TO 5000 FT. ACR Y'S PATH WAS GOING TO TAKE HIM BEHIND SMA X ON I TS DSCNT. ACR X'S TCASII ALERTED THE PLT THAT TFC WAS AHEAD AND THE PLT RESPONDED TO THE TCASII BY CLBING BACK TO 7200 FT. AS ACR Y LEVELED AND CLBED, IT GAINED HORIZLY ON SMA X. SEPARATION WAS THEN LOST AND PLT FILED A NEAR MISS. IF ACR Y WOULD HAVE CONTINUED HIS NORMAL DSCNT HE WOULD HAVE PASSED WELL BEHIND AND BELOW OF SMA X. RESPONDING TO THE TCASII CREATED THE SITUATION. THE PLT DID NOT ADVISE THE CTLR OF HIS ACTIONS UNTIL HE WAS LEVELING AT 7200 FT. THE CONCEPT OF TCASII IS GOOD, BUT ITS APPLICATIONS CAN CREATE A REAL HAZARD TO FLT SAFETY. ACR Y ALMOST RAN OVER SMA X BECAUSE OF ITS ACTIONS. SUPPLEMENTAL INFO FROM ACN 216550: WHILE IN CONTACT WITH MSY APCH CTL WE RECEIVED A TCASII WARNING. OUR POS WAS 13 NM ENE OF THE MSY VOR DSNDING TO 5000 FT. PASSING THROUGH 6500 FT WE RECEIVED AN AURAL AND VISUAL TCASII WARNING. THE TARGET WAS VERY CLOSE HORIZ AND APPROX 200 FT BELOW US. THE FO IMMEDIATELY FOLLOWED THE TCASII EVASION INSTRUCTIONS TO CLB. THE SMALL HIGH WING ACFT FINALLY BECAME VISUAL TO US AT A DISTANCE OF LESS THAN 1/2 MI FROM US AT APPROX 6000 FT. WERE IT NOT FOR THE TCASII WARNING WE WOULD HAVE HAD A NEAR MISS AT BEST. THE TARGET DID NOT SHOW UP ON OUR TCASII UNTIL WE WERE EXTREMELY CLOSE AND APCH APPARENTLY DID NOT SEE HIM UNTIL WE WERE OUT OF DANGER.
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.