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An mdt air carrier crew watched another aircraft make a loop through their altitude. This was seen visually and on TCASII.
| Attributes | |
| ACN | 214621 |
| Time | |
| Date | 199206 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mli |
| State Reference | IL |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mli |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Transport, High Wing, 2 Turboprop Eng |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other enroute airway : mli |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft |
| Flight Phase | climbout : intermediate altitude cruise other descent other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 260 flight time total : 7000 flight time type : 800 |
| ASRS Report | 214621 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
Aircraft position was issued by mli approach as 1230 O'clock, 8 mi, 800 ft below. At 6 mi out, picked him up on TCASII and altitude checked with approach advisory. Crew followed aircraft on TCASII with no observed deviation of altitude. When aircraft reached the 2 O'clock position, captain established visual contact, altitude checked. At the same moment, before mli approach could be notified, the aircraft executed an inside loop causing a TCASII RA 'climb -- climb' followed by a 'descend, descend' as aircraft came back through our altitude.
Original NASA ASRS Text
Title: AN MDT ACR CREW WATCHED ANOTHER ACFT MAKE A LOOP THROUGH THEIR ALT. THIS WAS SEEN VISUALLY AND ON TCASII.
Narrative: ACFT POS WAS ISSUED BY MLI APCH AS 1230 O'CLOCK, 8 MI, 800 FT BELOW. AT 6 MI OUT, PICKED HIM UP ON TCASII AND ALT CHKED WITH APCH ADVISORY. CREW FOLLOWED ACFT ON TCASII WITH NO OBSERVED DEV OF ALT. WHEN ACFT REACHED THE 2 O'CLOCK POS, CAPT ESTABLISHED VISUAL CONTACT, ALT CHKED. AT THE SAME MOMENT, BEFORE MLI APCH COULD BE NOTIFIED, THE ACFT EXECUTED AN INSIDE LOOP CAUSING A TCASII RA 'CLB -- CLB' FOLLOWED BY A 'DSND, DSND' AS ACFT CAME BACK THROUGH OUR 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.