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Aircraft X (B727) and aircraft Y were given headings for separation, but one aircraft did not receive the heading, because the transmission was blocked. This resulted in separation being lost between aircraft X and aircraft Y.
| Attributes | |
| ACN | 427198 |
| Time | |
| Date | 199902 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : mfd |
| State Reference | OH |
| Altitude | msl bound lower : 23000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller radar : 17 |
| ASRS Report | 427198 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | non adherence : clearance non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 28800 vertical : 300 |
| Supplementary | |
| Air Traffic Incident | Operational Error |
Narrative:
I turned both aircraft to parallel headings but didn't realized 1 aircraft didn't receive his heading because xmissions were blocked. I measured prior to climb clearance and had separation.
Original NASA ASRS Text
Title: ACFT X (B727) AND ACFT Y WERE GIVEN HDGS FOR SEPARATION, BUT ONE ACFT DID NOT RECEIVE THE HDG, BECAUSE THE XMISSION WAS BLOCKED. THIS RESULTED IN SEPARATION BEING LOST BTWN ACFT X AND ACFT Y.
Narrative: I TURNED BOTH ACFT TO PARALLEL HDGS BUT DIDN'T REALIZED 1 ACFT DIDN'T RECEIVE HIS HDG BECAUSE XMISSIONS WERE BLOCKED. I MEASURED PRIOR TO CLB CLRNC AND HAD SEPARATION.
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.