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Medium large transport crew interpreted clearance to be an 'expect' clearance, continuing as previously cleared.
| Attributes | |
| ACN | 499670 |
| Time | |
| Date | 200101 |
| Day | Tue |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : iad.airport |
| Altitude | msl bound lower : 1000 msl bound upper : 20000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc tracon : iad.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Route In Use | arrival star : jasen. |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 40 flight time total : 5500 flight time type : 400 |
| ASRS Report | 499670 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Original clearance was the jasen arrival into iad. Washington dulles -- first approach controller, or it may have been washington approach cleared us direct to the armel VOR STAR and issued descent clearance. After switching to approach control at dulles, we thought the controller issued an 'expect' clearance to runway 12 and direct to manne intersection. We interpreted the entire clearance to be an expect. We became busy setting up for runway 12 ILS as it was different than the runway we originally planned. We were descending this whole time to approximately 10000 ft. I'm not sure of the timing, but the controller asked us if we were proceeding direct to manne. He said (very tersely), that he had cleared us direct to manne. We were scrambling, trying to bring it up in the FMS and didn't answer him. He came back and gave a heading for vectors for the ILS. A couple of things contributed to this -- the hour of the day didn't help us or the controller. (We had flown the all nighter.) his phraseology was not very clear and we both interpreted his clearance to be an 'expect.' we also had been taken off the STAR including manne intersection, so we had deleted it from the FMS when setting up for the approach. We became confused when he cleared us back to an intersection on an arrival we had been taken off.
Original NASA ASRS Text
Title: MLG CREW INTERPED CLRNC TO BE AN 'EXPECT' CLRNC, CONTINUING AS PREVIOUSLY CLRED.
Narrative: ORIGINAL CLRNC WAS THE JASEN ARR INTO IAD. WASHINGTON DULLES -- FIRST APCH CTLR, OR IT MAY HAVE BEEN WASHINGTON APCH CLRED US DIRECT TO THE ARMEL VOR STAR AND ISSUED DSCNT CLRNC. AFTER SWITCHING TO APCH CTL AT DULLES, WE THOUGHT THE CTLR ISSUED AN 'EXPECT' CLRNC TO RWY 12 AND DIRECT TO MANNE INTXN. WE INTERPED THE ENTIRE CLRNC TO BE AN EXPECT. WE BECAME BUSY SETTING UP FOR RWY 12 ILS AS IT WAS DIFFERENT THAN THE RWY WE ORIGINALLY PLANNED. WE WERE DSNDING THIS WHOLE TIME TO APPROX 10000 FT. I'M NOT SURE OF THE TIMING, BUT THE CTLR ASKED US IF WE WERE PROCEEDING DIRECT TO MANNE. HE SAID (VERY TERSELY), THAT HE HAD CLRED US DIRECT TO MANNE. WE WERE SCRAMBLING, TRYING TO BRING IT UP IN THE FMS AND DIDN'T ANSWER HIM. HE CAME BACK AND GAVE A HDG FOR VECTORS FOR THE ILS. A COUPLE OF THINGS CONTRIBUTED TO THIS -- THE HR OF THE DAY DIDN'T HELP US OR THE CTLR. (WE HAD FLOWN THE ALL NIGHTER.) HIS PHRASEOLOGY WAS NOT VERY CLR AND WE BOTH INTERPED HIS CLRNC TO BE AN 'EXPECT.' WE ALSO HAD BEEN TAKEN OFF THE STAR INCLUDING MANNE INTXN, SO WE HAD DELETED IT FROM THE FMS WHEN SETTING UP FOR THE APCH. WE BECAME CONFUSED WHEN HE CLRED US BACK TO AN INTXN ON AN ARR WE HAD BEEN TAKEN OFF.
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.