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Flight crew of F100 is issued traffic which is sighted. They are instructed to maintain visual separation with second aircraft and turn to pass behind it. Flight crew of ATR, second aircraft, complain because of TCASII indication that traffic was too close.
| Attributes | |
| ACN | 380760 |
| Time | |
| Date | 199709 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : clt |
| State Reference | NC |
| Altitude | msl bound lower : 16000 msl bound upper : 16000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | ATR 42 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 13000 flight time type : 2500 |
| ASRS Report | 380760 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 13500 flight time type : 1050 |
| ASRS Report | 380519 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 18000 vertical : 0 |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
At 18500 ft during descent ZTL amended our cleared altitude from 11000 to 17000 ft and called traffic at 12 O'clock position, 8 mi. Visually acquired traffic (ATR) 12 O'clock position moving left to right at 16000 ft. ATC advised 'maintain visual separation, descend to 11000 ft.' we turned slightly left to increase separation and continued descent. TCASII TA followed by RA as we crossed altitudes. ATR complained to ZTL that we came too close based on their TCASII. Visual contact was maintained by us through the entire encounter and no danger was perceived based on good visual separation.
Original NASA ASRS Text
Title: FLC OF F100 IS ISSUED TFC WHICH IS SIGHTED. THEY ARE INSTRUCTED TO MAINTAIN VISUAL SEPARATION WITH SECOND ACFT AND TURN TO PASS BEHIND IT. FLC OF ATR, SECOND ACFT, COMPLAIN BECAUSE OF TCASII INDICATION THAT TFC WAS TOO CLOSE.
Narrative: AT 18500 FT DURING DSCNT ZTL AMENDED OUR CLRED ALT FROM 11000 TO 17000 FT AND CALLED TFC AT 12 O'CLOCK POS, 8 MI. VISUALLY ACQUIRED TFC (ATR) 12 O'CLOCK POS MOVING L TO R AT 16000 FT. ATC ADVISED 'MAINTAIN VISUAL SEPARATION, DSND TO 11000 FT.' WE TURNED SLIGHTLY L TO INCREASE SEPARATION AND CONTINUED DSCNT. TCASII TA FOLLOWED BY RA AS WE CROSSED ALTS. ATR COMPLAINED TO ZTL THAT WE CAME TOO CLOSE BASED ON THEIR TCASII. VISUAL CONTACT WAS MAINTAINED BY US THROUGH THE ENTIRE ENCOUNTER AND NO DANGER WAS PERCEIVED BASED ON GOOD VISUAL SEPARATION.
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.