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During a broken overcast at 900 ft, an unknown intruder aircraft created several TCASII alerts for arriving air carrier flts on ILS approach to runway 18L at cvg.
| Attributes | |
| ACN | 639423 |
| Time | |
| Date | 200412 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : cvg.airport |
| State Reference | OH |
| Altitude | agl single value : 900 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : cvg.tower tower : dfw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Challenger CL600 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 18l |
| Flight Phase | descent : vacating altitude |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : cvg.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 18l |
| Flight Phase | descent : vacating altitude |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 639423 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | airspace violation : entry conflict : airborne critical non adherence : far |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | flight crew : executed go around flight crew : took evasive action other |
| Miss Distance | horizontal : 100 vertical : 500 |
| Supplementary | |
| Problem Areas | Weather Flight Crew Human Performance Airspace Structure Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Flight X received a TCASII alert and then an RA during an ILS runway 18L approach to cvg. After the RA was received, the captain disconnected the autoplt and leveled the aircraft (the RA was 'monitor vertical speed'). Shortly thereafter, the RA went away, the flight was in VMC, and the approach and landing continued uneventfully. Another air carrier flight Y, 3-4 mi in front of us, also received the RA and executed a go around. Another air carrier flight behind us, also reported the traffic on TCASII, east of their position. The control tower at cvg did not know of any aircraft in the vicinity and could not see it from the control tower. It is my feeling that the aircraft Z was not on a flight plan, was not talking to any controller, was staying VMC underneath the cloud deck (900 ft broken), wandered into the class B, and finally realized his/her error at the ohio river and then proceeded east up the river.
Original NASA ASRS Text
Title: DURING A BROKEN OVCST AT 900 FT, AN UNKNOWN INTRUDER ACFT CREATED SEVERAL TCASII ALERTS FOR ARRIVING ACR FLTS ON ILS APCH TO RWY 18L AT CVG.
Narrative: FLT X RECEIVED A TCASII ALERT AND THEN AN RA DURING AN ILS RWY 18L APCH TO CVG. AFTER THE RA WAS RECEIVED, THE CAPT DISCONNECTED THE AUTOPLT AND LEVELED THE ACFT (THE RA WAS 'MONITOR VERT SPD'). SHORTLY THEREAFTER, THE RA WENT AWAY, THE FLT WAS IN VMC, AND THE APCH AND LNDG CONTINUED UNEVENTFULLY. ANOTHER ACR FLT Y, 3-4 MI IN FRONT OF US, ALSO RECEIVED THE RA AND EXECUTED A GAR. ANOTHER ACR FLT BEHIND US, ALSO RPTED THE TFC ON TCASII, E OF THEIR POS. THE CTL TWR AT CVG DID NOT KNOW OF ANY ACFT IN THE VICINITY AND COULD NOT SEE IT FROM THE CTL TWR. IT IS MY FEELING THAT THE ACFT Z WAS NOT ON A FLT PLAN, WAS NOT TALKING TO ANY CTLR, WAS STAYING VMC UNDERNEATH THE CLOUD DECK (900 FT BROKEN), WANDERED INTO THE CLASS B, AND FINALLY REALIZED HIS/HER ERROR AT THE OHIO RIVER AND THEN PROCEEDED E UP THE RIVER.
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.