 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Controller speech rate too fast to be understandable causes confusion for aircraft in class B airspace.
| Attributes | |
| ACN | 452710 |
| Time | |
| Date | 199910 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ord.airport |
| State Reference | IL |
| Altitude | msl single value : 7000 |
| Aircraft 1 | |
| Controlling Facilities | tracon : c90.tracon tower : mli.tower |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain |
| Qualification | pilot : multi engine pilot : atp |
| ASRS Report | 452710 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| ASRS Report | 452709 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa other flight crewb other other : 4 |
| Resolutory Action | controller : issued new clearance |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
ATC approach control issued descent from 7000 ft to 4000 ft. We affirmed the call and began descent. ATC was speaking very rapidly and did not challenge our readback. As we passed 6000 ft, controller informed us that the descent was meant for another aircraft and told us go ahead and descend to 5000 ft and quickly changed that to 4000 ft. He informed another flight that they should have descended and cleared them down to 4000 ft also. We informed him that it would be best if he slowed down his rapid speech. He said, 'people need to listen up.' other aircraft agreed speech too fast. Rest of approach normal. No conflicts noted.
Original NASA ASRS Text
Title: CTLR SPEECH RATE TOO FAST TO BE UNDERSTANDABLE CAUSES CONFUSION FOR ACFT IN CLASS B AIRSPACE.
Narrative: ATC APCH CTL ISSUED DSCNT FROM 7000 FT TO 4000 FT. WE AFFIRMED THE CALL AND BEGAN DSCNT. ATC WAS SPEAKING VERY RAPIDLY AND DID NOT CHALLENGE OUR READBACK. AS WE PASSED 6000 FT, CTLR INFORMED US THAT THE DSCNT WAS MEANT FOR ANOTHER ACFT AND TOLD US GO AHEAD AND DSND TO 5000 FT AND QUICKLY CHANGED THAT TO 4000 FT. HE INFORMED ANOTHER FLT THAT THEY SHOULD HAVE DSNDED AND CLRED THEM DOWN TO 4000 FT ALSO. WE INFORMED HIM THAT IT WOULD BE BEST IF HE SLOWED DOWN HIS RAPID SPEECH. HE SAID, 'PEOPLE NEED TO LISTEN UP.' OTHER ACFT AGREED SPEECH TOO FAST. REST OF APCH NORMAL. NO CONFLICTS NOTED.
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.