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B727, level at 7000 ft, thought they were cleared to descend to 4000 ft. Got to 6400 ft before ATC caught them and cleared them to 6000 ft.
| Attributes | |
| ACN | 358210 |
| Time | |
| Date | 199701 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | msl bound lower : 6400 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 180 flight time total : 7000 flight time type : 600 |
| ASRS Report | 358210 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were abeam approach end of ord's runway 14R at 7000 ft. Controller stated we should expect a short final as we were #1 to land on runway 14R. Captain thought he heard descend to 4000 ft and initiated a descent. I attempted to query controller about altitude but was stepped on by another aircraft. When I did get through he said to maintain 7000 ft but then said I see you've departed 7000 ft, descend and maintain 6000 ft. We had descended as low as 6400 ft prior to clearance to 6000 ft. There were no other aircraft in the area either visually or on TCASII (scale 10 mi). We were not advised of any conflict by the controller.
Original NASA ASRS Text
Title: B727, LEVEL AT 7000 FT, THOUGHT THEY WERE CLRED TO DSND TO 4000 FT. GOT TO 6400 FT BEFORE ATC CAUGHT THEM AND CLRED THEM TO 6000 FT.
Narrative: WE WERE ABEAM APCH END OF ORD'S RWY 14R AT 7000 FT. CTLR STATED WE SHOULD EXPECT A SHORT FINAL AS WE WERE #1 TO LAND ON RWY 14R. CAPT THOUGHT HE HEARD DSND TO 4000 FT AND INITIATED A DSCNT. I ATTEMPTED TO QUERY CTLR ABOUT ALT BUT WAS STEPPED ON BY ANOTHER ACFT. WHEN I DID GET THROUGH HE SAID TO MAINTAIN 7000 FT BUT THEN SAID I SEE YOU'VE DEPARTED 7000 FT, DSND AND MAINTAIN 6000 FT. WE HAD DSNDED AS LOW AS 6400 FT PRIOR TO CLRNC TO 6000 FT. THERE WERE NO OTHER ACFT IN THE AREA EITHER VISUALLY OR ON TCASII (SCALE 10 MI). WE WERE NOT ADVISED OF ANY CONFLICT BY THE CTLR.
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.