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An mdt, in or between clouds, responded to a TCASII RA caused by an small aircraft in the clouds that was unannounced by and unknown to ATC.
| Attributes | |
| ACN | 217741 |
| Time | |
| Date | 199208 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : cak |
| State Reference | OH |
| Altitude | msl bound lower : 5400 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : cak |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Transport, High Wing, 2 Turboprop Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other enroute other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft |
| Flight Phase | descent other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 6200 flight time type : 120 |
| ASRS Report | 217741 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : cfi |
| Experience | flight time last 90 days : 200 flight time total : 1600 flight time type : 120 |
| ASRS Report | 217740 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : nmac non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Light single engine aircraft exited cloud ahead of our aircraft. TCASII signaled a TA, then an RA. We responded to the command and deviated approximately 600 ft from assigned altitude. Supplemental information from acn 217740: no ATC advisory was given. ATC was advised and we returned to assigned altitude.
Original NASA ASRS Text
Title: AN MDT, IN OR BTWN CLOUDS, RESPONDED TO A TCASII RA CAUSED BY AN SMA IN THE CLOUDS THAT WAS UNANNOUNCED BY AND UNKNOWN TO ATC.
Narrative: LIGHT SINGLE ENG ACFT EXITED CLOUD AHEAD OF OUR ACFT. TCASII SIGNALED A TA, THEN AN RA. WE RESPONDED TO THE COMMAND AND DEVIATED APPROX 600 FT FROM ASSIGNED ALT. SUPPLEMENTAL INFO FROM ACN 217740: NO ATC ADVISORY WAS GIVEN. ATC WAS ADVISED AND WE RETURNED TO ASSIGNED ALT.
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.