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Flight crew descended below 10000 ft MSL and reduced airspeed to 200 KTS. ARTCC informed flight crew they had been assigned 250 KTS that the pilots were unable to recall being assigned.
| Attributes | |
| ACN | 431930 |
| Time | |
| Date | 199903 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zau.artcc |
| State Reference | IL |
| Altitude | msl single value : 10000 |
| Environment | |
| Flight Conditions | VMC VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Challenger CL604 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : cfi pilot : multi engine |
| Experience | flight time last 90 days : 116 flight time total : 1575 flight time type : 415 |
| ASRS Report | 431930 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : clearance other anomaly |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to original clearance |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Ambiguous |
Narrative:
We were assigned a descent to maintain an altitude below 10000 ft. We descended and slowed to 250 KIAS at 10000 ft and then to 200 KIAS as we neared our assigned altitude. At that point ARTCC queried our airspeed and told us to maintain 250 KIAS because that was the speed that had been assigned. Both the captain and I had no recollection of the '250 KIAS assigned.' I was handling the radios and never read back any assigned airspeed. We accelerated to 250 KIAS at that point. Obviously there was a breakdown in communication somewhere along the line.
Original NASA ASRS Text
Title: FLC DSNDED BELOW 10000 FT MSL AND REDUCED AIRSPD TO 200 KTS. ARTCC INFORMED FLC THEY HAD BEEN ASSIGNED 250 KTS THAT THE PLTS WERE UNABLE TO RECALL BEING ASSIGNED.
Narrative: WE WERE ASSIGNED A DSCNT TO MAINTAIN AN ALT BELOW 10000 FT. WE DSNDED AND SLOWED TO 250 KIAS AT 10000 FT AND THEN TO 200 KIAS AS WE NEARED OUR ASSIGNED ALT. AT THAT POINT ARTCC QUERIED OUR AIRSPD AND TOLD US TO MAINTAIN 250 KIAS BECAUSE THAT WAS THE SPD THAT HAD BEEN ASSIGNED. BOTH THE CAPT AND I HAD NO RECOLLECTION OF THE '250 KIAS ASSIGNED.' I WAS HANDLING THE RADIOS AND NEVER READ BACK ANY ASSIGNED AIRSPD. WE ACCELERATED TO 250 KIAS AT THAT POINT. OBVIOUSLY THERE WAS A BREAKDOWN IN COM SOMEWHERE ALONG THE LINE.
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.