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The flight crew of a large transport air carrier aircraft reports that they received a false TCASII 'RA' during their climb out from lax. After they had descended to 800 ft MSL and being unable to acquire the traffic they realized that this was probably a false warning.
| Attributes | |
| ACN | 361915 |
| Time | |
| Date | 199612 |
| Day | Tue |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : lax |
| State Reference | CA |
| Altitude | msl bound lower : 800 msl bound upper : 2700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 150 flight time total : 11700 flight time type : 7500 |
| ASRS Report | 361915 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
After taking off on runway 24L (lax), just passing by 2700 ft we had a TCASII resolution that came in a completely logical manner. First it alerted us about traffic just above us, then came, 'descend now,' as we were descending passing by 1700 ft came 'increase your descent.' we stopped the descent at more or less 800 ft after being sure that no traffic was above us. ATC was informed by us, but didn't understand until another airplane told him that we have had a TCASII resolution. TCASII malfunction was reported on the maintenance logbook.
Original NASA ASRS Text
Title: THE FLC OF A LGT ACR ACFT RPTS THAT THEY RECEIVED A FALSE TCASII 'RA' DURING THEIR CLBOUT FROM LAX. AFTER THEY HAD DSNDED TO 800 FT MSL AND BEING UNABLE TO ACQUIRE THE TFC THEY REALIZED THAT THIS WAS PROBABLY A FALSE WARNING.
Narrative: AFTER TAKING OFF ON RWY 24L (LAX), JUST PASSING BY 2700 FT WE HAD A TCASII RESOLUTION THAT CAME IN A COMPLETELY LOGICAL MANNER. FIRST IT ALERTED US ABOUT TFC JUST ABOVE US, THEN CAME, 'DSND NOW,' AS WE WERE DSNDING PASSING BY 1700 FT CAME 'INCREASE YOUR DSCNT.' WE STOPPED THE DSCNT AT MORE OR LESS 800 FT AFTER BEING SURE THAT NO TFC WAS ABOVE US. ATC WAS INFORMED BY US, BUT DIDN'T UNDERSTAND UNTIL ANOTHER AIRPLANE TOLD HIM THAT WE HAVE HAD A TCASII RESOLUTION. TCASII MALFUNCTION WAS RPTED ON THE MAINT LOGBOOK.
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.