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Incorrect phraseology used by a ZID ARTCC radar controller causes a B767 pilot to descend instead of reducing speed resulting in an operational error.
| Attributes | |
| ACN | 622576 |
| Time | |
| Date | 200406 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : ape.vortac |
| State Reference | OH |
| Altitude | msl bound lower : 30300 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level descent : intermediate altitude descent : vacating altitude |
| Route In Use | arrival star : n/s |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 50 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 15 flight time total : 650 |
| ASRS Report | 622576 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : clearance non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment other atc equipment : radar/modec other controllera other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 12000 vertical : 1300 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
Air carrier X was issued 'air carrier X reduce speed to two-five-zero.' pilot read back 'out of three-one-oh for two-five-oh.' perhaps if the pilot would have said 'flight level,' I would have caught the error.
Original NASA ASRS Text
Title: INCORRECT PHRASEOLOGY USED BY A ZID ARTCC RADAR CTLR CAUSES A B767 PLT TO DSND INSTEAD OF REDUCING SPD RESULTING IN AN OPERROR.
Narrative: ACR X WAS ISSUED 'ACR X REDUCE SPD TO TWO-FIVE-ZERO.' PLT READ BACK 'OUT OF THREE-ONE-OH FOR TWO-FIVE-OH.' PERHAPS IF THE PLT WOULD HAVE SAID 'FLT LEVEL,' I WOULD HAVE CAUGHT THE ERROR.
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.