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Operational error less than standard separation between an ATR 42 with descent clearance to 7000 ft and a C340 at 7000 ft on converging courses.
| Attributes | |
| ACN | 382660 |
| Time | |
| Date | 199710 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : huo |
| State Reference | NY |
| Altitude | msl bound lower : 7000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw tower : teb |
| Operator | common carrier : air carrier |
| Make Model Name | ATR 42 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Cessna 340/340A |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 10 controller radar : 15 flight time total : 80 |
| ASRS Report | 382660 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 10000 vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #2 was eastbound level at 7000 ft. Aircraft #1 was descending to 8000 ft converging sebound. My intention was to give an altitude crossing restr to aircraft #1 to avoid entering another sector's airspace but still clear him to the same altitude (8000 ft). Apparently I issued the crossing restr to 7000 ft inadvertently because it is a very common clearance to give (there is usually no traffic at 7000 ft). Since I did not intend to change the assigned altitude of the aircraft I did not update the full data block.
Original NASA ASRS Text
Title: OPERROR LTSS BTWN AN ATR 42 WITH DSCNT CLRNC TO 7000 FT AND A C340 AT 7000 FT ON CONVERGING COURSES.
Narrative: ACFT #2 WAS EBOUND LEVEL AT 7000 FT. ACFT #1 WAS DSNDING TO 8000 FT CONVERGING SEBOUND. MY INTENTION WAS TO GIVE AN ALT XING RESTR TO ACFT #1 TO AVOID ENTERING ANOTHER SECTOR'S AIRSPACE BUT STILL CLR HIM TO THE SAME ALT (8000 FT). APPARENTLY I ISSUED THE XING RESTR TO 7000 FT INADVERTENTLY BECAUSE IT IS A VERY COMMON CLRNC TO GIVE (THERE IS USUALLY NO TFC AT 7000 FT). SINCE I DID NOT INTEND TO CHANGE THE ASSIGNED ALT OF THE ACFT I DID NOT UPDATE THE FULL DATA BLOCK.
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.