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Flight crew of an medium large transport had a TCASII alert on an 8 mi final approach causing them to make a go around. Approach control reported no known traffic. The TCASII equipment was written up for a maintenance inspection.
| Attributes | |
| ACN | 400470 |
| Time | |
| Date | 199804 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : msp |
| State Reference | MN |
| Altitude | msl bound lower : 3500 msl bound upper : 3500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : msp |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach landing : go around |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 7500 flight time type : 3500 |
| ASRS Report | 400470 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | other |
| Consequence | faa : reviewed incident with flight crew Other |
| Miss Distance | horizontal : 0 vertical : 350 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
On final approach to runway 30R msp (3500 ft MSL) we had flaps 15 degrees and gear down. We got a climb command (red) with no yellow TA before the command. We did not visually see the traffic but it was on the TCASII screen 300 ft directly below us. We climbed up to 3800 ft MSL. The traffic disappeared on the screen so began a descent, again. Then we got a yellow TA (same -300 ft directly below) so we executed a go around. We came back around and landed without any further alerts. In both cases we notified ATC of first our climb then eventually the go around. They said that they observed no traffic conflict. After blocking in we wrote up a maintenance ticket on the TCASII and also notified maintenance by phone.
Original NASA ASRS Text
Title: FLC OF AN MLG HAD A TCASII ALERT ON AN 8 MI FINAL APCH CAUSING THEM TO MAKE A GAR. APCH CTL RPTED NO KNOWN TFC. THE TCASII EQUIP WAS WRITTEN UP FOR A MAINT INSPECTION.
Narrative: ON FINAL APCH TO RWY 30R MSP (3500 FT MSL) WE HAD FLAPS 15 DEGS AND GEAR DOWN. WE GOT A CLB COMMAND (RED) WITH NO YELLOW TA BEFORE THE COMMAND. WE DID NOT VISUALLY SEE THE TFC BUT IT WAS ON THE TCASII SCREEN 300 FT DIRECTLY BELOW US. WE CLBED UP TO 3800 FT MSL. THE TFC DISAPPEARED ON THE SCREEN SO BEGAN A DSCNT, AGAIN. THEN WE GOT A YELLOW TA (SAME -300 FT DIRECTLY BELOW) SO WE EXECUTED A GAR. WE CAME BACK AROUND AND LANDED WITHOUT ANY FURTHER ALERTS. IN BOTH CASES WE NOTIFIED ATC OF FIRST OUR CLB THEN EVENTUALLY THE GAR. THEY SAID THAT THEY OBSERVED NO TFC CONFLICT. AFTER BLOCKING IN WE WROTE UP A MAINT TICKET ON THE TCASII AND ALSO NOTIFIED MAINT BY PHONE.
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.