 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
An A320 flight crew reported a false alert from TCAS that commanded a 3;500 FPM descent from their cruise altitude of FL360. ATC reported no traffic within 100 NM.
| Attributes | |
| ACN | 983402 |
| Time | |
| Date | 201112 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZDV.ARTCC |
| State Reference | CO |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Component | |
| Aircraft Component | Traffic Collision Avoidance System (TCAS) |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 11000 Flight Crew Type 3500 |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Experience | Flight Crew Last 90 Days 240 Flight Crew Total 12600 Flight Crew Type 10000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
RA with flight instruments indicating [TCAS commanding] over a 3;000 FPM descent. Clear of conflict at FL345; returned to FL360. ATC stated there was no aircraft within 100 NM of our flight. RA appeared again in a few minutes; confirmed again with ATC that no aircraft were near us. Sent a mrm code to maintenance stating TCAS was unreliable.
Original NASA ASRS Text
Title: An A320 flight crew reported a false alert from TCAS that commanded a 3;500 FPM descent from their cruise altitude of FL360. ATC reported no traffic within 100 NM.
Narrative: RA with flight instruments indicating [TCAS commanding] over a 3;000 FPM descent. Clear of conflict at FL345; returned to FL360. ATC stated there was no aircraft within 100 NM of our flight. RA appeared again in a few minutes; confirmed again with ATC that no aircraft were near us. Sent a MRM code to Maintenance stating TCAS was unreliable.
Data retrieved from NASA's ASRS site as of April 2012 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.