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Flight crew of large transport had TCASII TA. Queried controller if aircraft traffic was climbing. Negative. No action taken to increase separation.
| Attributes | |
| ACN | 197897 |
| Time | |
| Date | 199112 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bdl |
| State Reference | CT |
| Altitude | msl bound lower : 9000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bdl |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 197897 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | other |
Narrative:
Large transport on deer park arrival to bdl was level at 10000, issued traffic 10 O'clock, 8 mi level 9000 eastbound. When targets were about 1 1/2 mi apart, large transport said -- bradley our TCASII shows that traffic climbing is he still level? Large transport took no action other than asking question. Neither aircraft ever showed any altitude change on radar, mode C. My reason for filing this is why would TCASII show an aircraft climbing when both were in level flight for about 5 mi, and what could happen if this happened in congested skies and the TCASII aircraft deviates from altitude because of a wrong TCASII resolution.
Original NASA ASRS Text
Title: FLC OF LGT HAD TCASII TA. QUERIED CTLR IF ACFT TFC WAS CLBING. NEGATIVE. NO ACTION TAKEN TO INCREASE SEPARATION.
Narrative: LGT ON DEER PARK ARR TO BDL WAS LEVEL AT 10000, ISSUED TFC 10 O'CLOCK, 8 MI LEVEL 9000 EBOUND. WHEN TARGETS WERE ABOUT 1 1/2 MI APART, LGT SAID -- BRADLEY OUR TCASII SHOWS THAT TFC CLBING IS HE STILL LEVEL? LGT TOOK NO ACTION OTHER THAN ASKING QUESTION. NEITHER ACFT EVER SHOWED ANY ALT CHANGE ON RADAR, MODE C. MY REASON FOR FILING THIS IS WHY WOULD TCASII SHOW AN ACFT CLBING WHEN BOTH WERE IN LEVEL FLT FOR ABOUT 5 MI, AND WHAT COULD HAPPEN IF THIS HAPPENED IN CONGESTED SKIES AND THE TCASII ACFT DEVIATES FROM ALT BECAUSE OF A WRONG TCASII RESOLUTION.
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.