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MD88 flight crew initiates TCASII evasive action maneuver due to same altitude conflicting traffic when deviating around WX.
| Attributes | |
| ACN | 445096 |
| Time | |
| Date | 199907 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : atl.vortac |
| State Reference | GA |
| Altitude | msl bound lower : 33000 msl bound upper : 33300 |
| Environment | |
| Flight Conditions | Mixed |
| Weather Elements | Thunderstorm |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 5500 flight time type : 1000 |
| ASRS Report | 445096 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe inflight encounter : weather non adherence : required legal separation non adherence : published procedure other spatial deviation |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance controller : issued advisory flight crew : took evasive action flight crew : took precautionary avoidance action flight crew : exited adverse environment |
| Miss Distance | horizontal : 18000 vertical : 400 |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance Weather |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
A line of numerous thunderstorms were in an e-w line about 30-40 NM south of atlanta. We (X) were on an IFR flight plan from north, through atl and south through seminole (szw) VOR. We were cleared to deviate 'as necessary, direct szw when able.' we deviated east of atl and were just clearing the line of storms after having turned right to a southwesterly heading. ZTL instructed us to 'turn left 090 degrees.' we were unable due to a near thunderstorm cell in that direction. We stated that and said we could fly 180 degrees. Center concurred and said to turn immediately for traffic, we did. Concurrently, we noted TCASII traffic at 1-2 O'clock position inside 10 mi. This rapidly changed to a TA. Center had been attempting to contact the air carrier Y flight in conflict with us. Center finally established contact with air carrier Y and told them to turn left to 360 degrees immediately. We then got an RA with a 'climb' command. We initiated a climb and got to FL333 and received TCASII 'clear of traffic.' air carrier Y reported they had complied with a TCASII 'descend' RA themselves. TCASII showed closest distance at 3-4 mi. Center then handed us off to a different sector and said nothing about the incident.
Original NASA ASRS Text
Title: MD88 FLC INITIATES TCASII EVASIVE ACTION MANEUVER DUE TO SAME ALT CONFLICTING TFC WHEN DEVIATING AROUND WX.
Narrative: A LINE OF NUMEROUS TSTMS WERE IN AN E-W LINE ABOUT 30-40 NM S OF ATLANTA. WE (X) WERE ON AN IFR FLT PLAN FROM N, THROUGH ATL AND S THROUGH SEMINOLE (SZW) VOR. WE WERE CLRED TO DEVIATE 'AS NECESSARY, DIRECT SZW WHEN ABLE.' WE DEVIATED E OF ATL AND WERE JUST CLRING THE LINE OF STORMS AFTER HAVING TURNED R TO A SOUTHWESTERLY HEADING. ZTL INSTRUCTED US TO 'TURN L 090 DEGS.' WE WERE UNABLE DUE TO A NEAR TSTM CELL IN THAT DIRECTION. WE STATED THAT AND SAID WE COULD FLY 180 DEGS. CTR CONCURRED AND SAID TO TURN IMMEDIATELY FOR TFC, WE DID. CONCURRENTLY, WE NOTED TCASII TFC AT 1-2 O'CLOCK POS INSIDE 10 MI. THIS RAPIDLY CHANGED TO A TA. CTR HAD BEEN ATTEMPTING TO CONTACT THE ACR Y FLT IN CONFLICT WITH US. CTR FINALLY ESTABLISHED CONTACT WITH ACR Y AND TOLD THEM TO TURN L TO 360 DEGS IMMEDIATELY. WE THEN GOT AN RA WITH A 'CLB' COMMAND. WE INITIATED A CLB AND GOT TO FL333 AND RECEIVED TCASII 'CLR OF TFC.' ACR Y RPTED THEY HAD COMPLIED WITH A TCASII 'DSND' RA THEMSELVES. TCASII SHOWED CLOSEST DISTANCE AT 3-4 MI. CTR THEN HANDED US OFF TO A DIFFERENT SECTOR AND SAID NOTHING ABOUT THE INCIDENT.
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.