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Loss of appropriate separation between reporter's aircraft and an unknown aircraft at a lower altitude and on a converging course during descent to FL230.
| Attributes | |
| ACN | 387207 |
| Time | |
| Date | 199712 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : rom |
| State Reference | FO |
| Altitude | msl bound lower : 24100 msl bound upper : 24800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other enroute airway : lirr |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 22000 flight time type : 2500 |
| ASRS Report | 387207 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 225 flight time total : 9500 flight time type : 4800 |
| ASRS Report | 387556 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | vertical : 750 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
On descent to FL230, TCASII gave a TA followed by an RA. Scope set to 40 NM range. At time of RA aircraft in conflict showed FL241, we were descending through FL248. Evasive maneuver via TCASII was executed. Then continued descent to assigned altitude of FL230. Rome ATC inquired if we had executed an evasive maneuver and we said yes. Did not visually observe other aircraft. Supplemental information from acn 387556: initial descent, captain was flying and other copilot in right seat. Received an RA and captain initiated a climb. Other aircraft passed below from 2 O'clock to 7 O'clock position. No previous notice of traffic to us.
Original NASA ASRS Text
Title: LOSS OF APPROPRIATE SEPARATION BTWN RPTR'S ACFT AND AN UNKNOWN ACFT AT A LOWER ALT AND ON A CONVERGING COURSE DURING DSCNT TO FL230.
Narrative: ON DSCNT TO FL230, TCASII GAVE A TA FOLLOWED BY AN RA. SCOPE SET TO 40 NM RANGE. AT TIME OF RA ACFT IN CONFLICT SHOWED FL241, WE WERE DSNDING THROUGH FL248. EVASIVE MANEUVER VIA TCASII WAS EXECUTED. THEN CONTINUED DSCNT TO ASSIGNED ALT OF FL230. ROME ATC INQUIRED IF WE HAD EXECUTED AN EVASIVE MANEUVER AND WE SAID YES. DID NOT VISUALLY OBSERVE OTHER ACFT. SUPPLEMENTAL INFO FROM ACN 387556: INITIAL DSCNT, CAPT WAS FLYING AND OTHER COPLT IN R SEAT. RECEIVED AN RA AND CAPT INITIATED A CLB. OTHER ACFT PASSED BELOW FROM 2 O'CLOCK TO 7 O'CLOCK POS. NO PREVIOUS NOTICE OF TFC TO US.
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.