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B737 crew assigned descent to FL250 continued through the altitude and conflicted with an airbus at FL240.
| Attributes | |
| ACN | 619097 |
| Time | |
| Date | 200405 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : eno.vortac |
| State Reference | DE |
| Altitude | msl bound lower : 24000 msl bound upper : 25000 |
| Environment | |
| Weather Elements | Thunderstorm |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Airbus Industrie Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 4 |
| ASRS Report | 619097 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude altitude deviation : overshoot conflict : airborne less severe non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : radar/mode c other controllera |
| Resolutory Action | controller : issued new clearance controller : separated traffic flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 300 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Numerous WX deviations and WX closed a portion of an FMS arrival. I cleared aircraft X to rejoin the arrival and assigned FL250 instead of the normal descent profile. The pilot read back FL250. A few moments later, I observed aircraft X descending below FL250 and converging with aircraft Y at FL240. I issued aircraft X FL210 and called traffic and climbed aircraft Y to FL270.
Original NASA ASRS Text
Title: B737 CREW ASSIGNED DSCNT TO FL250 CONTINUED THROUGH THE ALT AND CONFLICTED WITH AN AIRBUS AT FL240.
Narrative: NUMEROUS WX DEVS AND WX CLOSED A PORTION OF AN FMS ARR. I CLRED ACFT X TO REJOIN THE ARR AND ASSIGNED FL250 INSTEAD OF THE NORMAL DSCNT PROFILE. THE PLT READ BACK FL250. A FEW MOMENTS LATER, I OBSERVED ACFT X DSNDING BELOW FL250 AND CONVERGING WITH ACFT Y AT FL240. I ISSUED ACFT X FL210 AND CALLED TFC AND CLBED ACFT Y TO FL270.
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.