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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Flight crew of a canadair regional jet, CL65, believed that they caught an ATC error during descent when ATC had them maintain 280 KTS above 10000 ft, but did not specifically remove the restr when subsequently clearing them below 10000 ft. Since the flight crew apparently took it upon themselves to slow to 250 KTS airspeed, they thought that ATC had forgotten to remove the speed reference.
| Attributes | |
| ACN | 384660 |
| Time | |
| Date | 199710 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : bos |
| State Reference | MA |
| Altitude | msl bound lower : 8000 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Challenger CL604 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : zbw |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 250 flight time total : 4400 flight time type : 300 |
| ASRS Report | 384660 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
While in our descent to bos, the center controller asked us to maintain 280 KTS. We were later asked to descend to an altitude below 10000 ft. This, if not caught in time, could have caused us to exceed 250 KTS below 10000 ft.
Original NASA ASRS Text
Title: FLC OF A CANADAIR REGIONAL JET, CL65, BELIEVED THAT THEY CAUGHT AN ATC ERROR DURING DSCNT WHEN ATC HAD THEM MAINTAIN 280 KTS ABOVE 10000 FT, BUT DID NOT SPECIFICALLY REMOVE THE RESTR WHEN SUBSEQUENTLY CLRING THEM BELOW 10000 FT. SINCE THE FLC APPARENTLY TOOK IT UPON THEMSELVES TO SLOW TO 250 KTS AIRSPD, THEY THOUGHT THAT ATC HAD FORGOTTEN TO REMOVE THE SPD REF.
Narrative: WHILE IN OUR DSCNT TO BOS, THE CTR CTLR ASKED US TO MAINTAIN 280 KTS. WE WERE LATER ASKED TO DSND TO AN ALT BELOW 10000 FT. THIS, IF NOT CAUGHT IN TIME, COULD HAVE CAUSED US TO EXCEED 250 KTS BELOW 10000 FT.
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.