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Flight crew of light transport believed they were cleared to descend to 16000' crossing at bison on approach to den. Clearance allegedly was to plan on crossing bison or expect crossing bison at 16000'.
| Attributes | |
| ACN | 163371 |
| Time | |
| Date | 199011 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : den |
| State Reference | CO |
| Altitude | msl bound lower : 16000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent other |
| Route In Use | arrival other enroute airway : zdv |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 270 flight time total : 7500 flight time type : 2800 |
| ASRS Report | 163371 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 260 flight time total : 4000 |
| ASRS Report | 163364 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | faa : investigated faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Center gave us a clearance to cross bison intersection on the denver 213 degree right 36 DME fix at 16000'. At that time, we were approximately on the 215 degree right 90 mi out. To avoid turbulence, I decided not to descend until 75 DME. At about 80 DME, the controller told us to descend to FL230. Upon reaching, my first officer asked if I would like to continue the descent. I said yes. He told the controller we were continuing down for 16000' MSL at bison. The controller then told us we were supposed to be at FL230. I immediately climbed back to FL230 from approximately 22500' MSL and told the controller we thought we were supposed to cross bison at 16000'. He said no sir I told you to expect that. I informed him we read back the clearance as that we were supposed to cross bison at 16000' MSL. He then said I might have made a miscom. About 2-3 mins later, he gave me a phone number to call saying we had a possible altitude violation.
Original NASA ASRS Text
Title: FLT CREW OF LTT BELIEVED THEY WERE CLEARED TO DESCEND TO 16000' CROSSING AT BISON ON APCH TO DEN. CLRNC ALLEGEDLY WAS TO PLAN ON CROSSING BISON OR EXPECT CROSSING BISON AT 16000'.
Narrative: CTR GAVE US A CLRNC TO CROSS BISON INTXN ON THE DENVER 213 DEG R 36 DME FIX AT 16000'. AT THAT TIME, WE WERE APPROX ON THE 215 DEG R 90 MI OUT. TO AVOID TURB, I DECIDED NOT TO DSND UNTIL 75 DME. AT ABOUT 80 DME, THE CTLR TOLD US TO DSND TO FL230. UPON REACHING, MY F/O ASKED IF I WOULD LIKE TO CONTINUE THE DSNT. I SAID YES. HE TOLD THE CTLR WE WERE CONTINUING DOWN FOR 16000' MSL AT BISON. THE CTLR THEN TOLD US WE WERE SUPPOSED TO BE AT FL230. I IMMEDIATELY CLBED BACK TO FL230 FROM APPROX 22500' MSL AND TOLD THE CTLR WE THOUGHT WE WERE SUPPOSED TO CROSS BISON AT 16000'. HE SAID NO SIR I TOLD YOU TO EXPECT THAT. I INFORMED HIM WE READ BACK THE CLRNC AS THAT WE WERE SUPPOSED TO CROSS BISON AT 16000' MSL. HE THEN SAID I MIGHT HAVE MADE A MISCOM. ABOUT 2-3 MINS LATER, HE GAVE ME A PHONE NUMBER TO CALL SAYING WE HAD A POSSIBLE ALT VIOLATION.
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.