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A commuter SF34 aircraft was issued a descent by mistake to 8000 ft instead of 9000 ft, with a B737 climbing to 8000 ft. A controller relieving the position noticed the SF34 at 8300 ft and climbed the aircraft to 9000 ft, but not before less than standard separation occurred.
| Attributes | |
| ACN | 359105 |
| Time | |
| Date | 199701 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : pvd |
| State Reference | RI |
| Altitude | msl bound lower : 8000 msl bound upper : 8300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pvd |
| Operator | common carrier : air carrier |
| Make Model Name | SF 340A |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 6 |
| ASRS Report | 359105 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| 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 | controller : issued new clearance none taken : unable other |
| Consequence | Other |
| Miss Distance | horizontal : 6500 vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The commuter aircraft (air carrier X) was on V16 nebound, descending to 8000 ft. The B737 (air carrier Y), was nwbound, climbing to 8000 ft. As the relieving controller, I was told that air carrier X was descending to 9000 ft reference air carrier Y climbing to 8000 ft. 15 seconds after I sat down, I realized that air carrier X was at 8300 ft, so I climbed him to 9000 ft and exchanged traffic. Each aircraft saw each other.
Original NASA ASRS Text
Title: A COMMUTER SF34 ACFT WAS ISSUED A DSCNT BY MISTAKE TO 8000 FT INSTEAD OF 9000 FT, WITH A B737 CLBING TO 8000 FT. A CTLR RELIEVING THE POS NOTICED THE SF34 AT 8300 FT AND CLBED THE ACFT TO 9000 FT, BUT NOT BEFORE LTSS OCCURRED.
Narrative: THE COMMUTER ACFT (ACR X) WAS ON V16 NEBOUND, DSNDING TO 8000 FT. THE B737 (ACR Y), WAS NWBOUND, CLBING TO 8000 FT. AS THE RELIEVING CTLR, I WAS TOLD THAT ACR X WAS DSNDING TO 9000 FT REF ACR Y CLBING TO 8000 FT. 15 SECONDS AFTER I SAT DOWN, I REALIZED THAT ACR X WAS AT 8300 FT, SO I CLBED HIM TO 9000 FT AND EXCHANGED TFC. EACH ACFT SAW EACH OTHER.
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.