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An MD80 at FL330 received a TCASII RA to descend due to traffic at FL335. The MD80 descended to FL325 until clear of traffic, then returned to FL330.
| Attributes | |
| ACN | 413894 |
| Time | |
| Date | 199809 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bce |
| State Reference | UT |
| Altitude | msl bound lower : 32500 msl bound upper : 33000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | L-1011 Tri-Star All Series |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 413894 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Radar on 80 mi scale for WX. Heard 'traffic, traffic' alert from TCASII. Target seemed to be at 10-11 O'clock and 500 ft above and descending. Almost immediately changed to RA instructing 'descend, descend.' did so to FL325 and heard 'clear of conflict' from TCASII. Informed ATC and returned to FL330. ATC said no problem.
Original NASA ASRS Text
Title: AN MD80 AT FL330 RECEIVED A TCASII RA TO DSND DUE TO TFC AT FL335. THE MD80 DSNDED TO FL325 UNTIL CLR OF TFC, THEN RETURNED TO FL330.
Narrative: RADAR ON 80 MI SCALE FOR WX. HEARD 'TFC, TFC' ALERT FROM TCASII. TARGET SEEMED TO BE AT 10-11 O'CLOCK AND 500 FT ABOVE AND DSNDING. ALMOST IMMEDIATELY CHANGED TO RA INSTRUCTING 'DSND, DSND.' DID SO TO FL325 AND HEARD 'CLR OF CONFLICT' FROM TCASII. INFORMED ATC AND RETURNED TO FL330. ATC SAID NO PROB.
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.