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Flight crew of air carrier medium large transport aircraft took evasive action in response to a TCASII RA resulting in deviation from assigned altitude.
| Attributes | |
| ACN | 240941 |
| Time | |
| Date | 199305 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : spa |
| State Reference | SC |
| Altitude | msl bound lower : 32400 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 11500 flight time type : 1000 |
| ASRS Report | 240941 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During cruise at FL330, 75 mi south of spa VOR, TCASII voice announced traffic, followed by descend, traffic, descend. Began descent, traffic observed on TCASII at 1-2 O'clock and 2 mi (red square plus 1400 ft) and plus 1400 ft. TCASII said monitor vertical speed and we leveled at 32400 ft. Advised ZTL on the RA and returned to FL330. Atl advised us that there was no traffic above us in that direction, only traffic at 2 O'clock at FL290 which was visually observed and traffic at 10 O'clock and FL350. We did not visually spot the traffic giving us the RA. May have been a false advisory. TCASII did not announce clear of conflict as it is supposed to do. TCASII appeared to work normally the rest of the flight. Performed TCASII test again and passed the test. ZTL said there was no traffic in that area. Filed TCASII incident form with the company.
Original NASA ASRS Text
Title: FLC OF ACR MLG ACFT TOOK EVASIVE ACTION IN RESPONSE TO A TCASII RA RESULTING IN DEV FROM ASSIGNED ALT.
Narrative: DURING CRUISE AT FL330, 75 MI S OF SPA VOR, TCASII VOICE ANNOUNCED TFC, FOLLOWED BY DSND, TFC, DSND. BEGAN DSCNT, TFC OBSERVED ON TCASII AT 1-2 O'CLOCK AND 2 MI (RED SQUARE PLUS 1400 FT) AND PLUS 1400 FT. TCASII SAID MONITOR VERT SPD AND WE LEVELED AT 32400 FT. ADVISED ZTL ON THE RA AND RETURNED TO FL330. ATL ADVISED US THAT THERE WAS NO TFC ABOVE US IN THAT DIRECTION, ONLY TFC AT 2 O'CLOCK AT FL290 WHICH WAS VISUALLY OBSERVED AND TFC AT 10 O'CLOCK AND FL350. WE DID NOT VISUALLY SPOT THE TFC GIVING US THE RA. MAY HAVE BEEN A FALSE ADVISORY. TCASII DID NOT ANNOUNCE CLR OF CONFLICT AS IT IS SUPPOSED TO DO. TCASII APPEARED TO WORK NORMALLY THE REST OF THE FLT. PERFORMED TCASII TEST AGAIN AND PASSED THE TEST. ZTL SAID THERE WAS NO TFC IN THAT AREA. FILED TCASII INCIDENT FORM WITH THE COMPANY.
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.