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Small transport was descended through an altitude occupied by another aircraft due to an engine problem, resulting in less than standard separation.
| Attributes | |
| ACN | 116230 |
| Time | |
| Date | 198907 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : pdt |
| State Reference | OR |
| Altitude | msl bound lower : 10300 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | descent other |
| Route In Use | enroute airway : zse |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air taxi |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 116230 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Miss Distance | horizontal : 24600 vertical : 700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Small transport X at 12,000 en route from sun to bfi on IFR flight plan. Over PDT pilot stated 'had problem with left engine' and requested to land at PDT. I issued an immediate descent clearance to 6000. Then I turned the small transport X to 250 degree to avoid the atx Y that was below him at 11,000 en route, opposite direction, on the same airway. I also turned the atx Y to 070 degree to avoid the small transport X. During descent, only 4.2 mi separation existed when aircraft were less than a thousand feet apart. Small transport X secured left engine, subsequently landed safely at PDT airport without incident. Pilot of small transport X later stated trouble was a blown cylinder head in left engine.
Original NASA ASRS Text
Title: SMT WAS DESCENDED THROUGH AN ALT OCCUPIED BY ANOTHER ACFT DUE TO AN ENGINE PROBLEM, RESULTING IN LESS THAN STANDARD SEPARATION.
Narrative: SMT X AT 12,000 ENRTE FROM SUN TO BFI ON IFR FLT PLAN. OVER PDT PLT STATED 'HAD PROBLEM WITH LEFT ENGINE' AND REQUESTED TO LAND AT PDT. I ISSUED AN IMMEDIATE DSCNT CLRNC TO 6000. THEN I TURNED THE SMT X TO 250 DEG TO AVOID THE ATX Y THAT WAS BELOW HIM AT 11,000 ENRTE, OPPOSITE DIRECTION, ON THE SAME AIRWAY. I ALSO TURNED THE ATX Y TO 070 DEG TO AVOID THE SMT X. DURING DSCNT, ONLY 4.2 MI SEPARATION EXISTED WHEN ACFT WERE LESS THAN A THOUSAND FEET APART. SMT X SECURED LEFT ENGINE, SUBSEQUENTLY LANDED SAFELY AT PDT ARPT WITHOUT INCIDENT. PLT OF SMT X LATER STATED TROUBLE WAS A BLOWN CYLINDER HEAD IN LEFT ENGINE.
Data retrieved from NASA's ASRS site as of August 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.