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TCASII alerted flight crew of traffic conflict during their descent, however, radar controller didn't observe conflicting traffic.
| Attributes | |
| ACN | 291369 |
| Time | |
| Date | 199412 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mem |
| State Reference | TN |
| Altitude | msl bound lower : 7000 msl bound upper : 7700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mem |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute airway : mem |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Dassault-Breguet Undifferentiated or Other Model |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 291369 |
| Person 2 | |
| 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 |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
B727 descending on STAR radial to 7000 ft. At about 7300 ft, pilot received an RA on traffic 500 ft below. The pilot climbed to 7700 ft and inquired about traffic. Only traffic within 5 mi was a DA02 level at 5000 ft. Traffic was not issued by controller due to more than required separation being used. Pilot insisted that TCASII had shown traffic only 500 ft below. No primary or unknown secondary targets were observed. I believe this situation occurred due to either pilot misreading TCASII or TCASII itself faulty. This concerns me because it causes controllers to issue traffic that is not a factor to avoid these occurrences, thereby increasing workload, and has the potential to put other aircraft in hazardous sits. I strongly feel that TCASII should be used in advisory mode only in terminal airspace 10000 ft and below.
Original NASA ASRS Text
Title: TCASII ALERTED FLC OF TFC CONFLICT DURING THEIR DSCNT, HOWEVER, RADAR CTLR DIDN'T OBSERVE CONFLICTING TFC.
Narrative: B727 DSNDING ON STAR RADIAL TO 7000 FT. AT ABOUT 7300 FT, PLT RECEIVED AN RA ON TFC 500 FT BELOW. THE PLT CLBED TO 7700 FT AND INQUIRED ABOUT TFC. ONLY TFC WITHIN 5 MI WAS A DA02 LEVEL AT 5000 FT. TFC WAS NOT ISSUED BY CTLR DUE TO MORE THAN REQUIRED SEPARATION BEING USED. PLT INSISTED THAT TCASII HAD SHOWN TFC ONLY 500 FT BELOW. NO PRIMARY OR UNKNOWN SECONDARY TARGETS WERE OBSERVED. I BELIEVE THIS SIT OCCURRED DUE TO EITHER PLT MISREADING TCASII OR TCASII ITSELF FAULTY. THIS CONCERNS ME BECAUSE IT CAUSES CTLRS TO ISSUE TFC THAT IS NOT A FACTOR TO AVOID THESE OCCURRENCES, THEREBY INCREASING WORKLOAD, AND HAS THE POTENTIAL TO PUT OTHER ACFT IN HAZARDOUS SITS. I STRONGLY FEEL THAT TCASII SHOULD BE USED IN ADVISORY MODE ONLY IN TERMINAL AIRSPACE 10000 FT AND BELOW.
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.