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An air carrier B757 flight crew got off route when they misinterpreted their pre departure clearance as being different from their filed route.
| Attributes | |
| ACN | 382753 |
| Time | |
| Date | 199710 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : hnn |
| State Reference | WV |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 120 flight time total : 16000 flight time type : 1500 |
| ASRS Report | 382753 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | non adherence : clearance non adherence : far other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Our filed route was iad-ldn-J134-stl-J24-mkc-J80-fqf-J116- ekr-mtu-slc. Our pre departure clearance read 'capital 4 departure ldn-J134-hnn then as filed.' wnw of hnn VOR ZID asked if we were proceeding on J134. We told them 'negative -- direct stl.' upon examining the pre departure clearance, we concluded that the pre departure clearance clearance could easily be interpreted either way, ie, after hnn VOR direct stl or J134 6 stl, and since our filed routing was different from the pre departure clearance, we assumed ATC wanted hnn direct stl. The hnn-J134-stl didn't even arise as a question until queried by ATC. We were also aware of the hnn-J134-stl dogleg. Our decision was based on the ATC issued pre departure clearance.
Original NASA ASRS Text
Title: AN ACR B757 FLC GOT OFF RTE WHEN THEY MISINTERPRETED THEIR PDC AS BEING DIFFERENT FROM THEIR FILED RTE.
Narrative: OUR FILED RTE WAS IAD-LDN-J134-STL-J24-MKC-J80-FQF-J116- EKR-MTU-SLC. OUR PDC READ 'CAPITAL 4 DEP LDN-J134-HNN THEN AS FILED.' WNW OF HNN VOR ZID ASKED IF WE WERE PROCEEDING ON J134. WE TOLD THEM 'NEGATIVE -- DIRECT STL.' UPON EXAMINING THE PDC, WE CONCLUDED THAT THE PDC CLRNC COULD EASILY BE INTERPRETED EITHER WAY, IE, AFTER HNN VOR DIRECT STL OR J134 6 STL, AND SINCE OUR FILED ROUTING WAS DIFFERENT FROM THE PDC, WE ASSUMED ATC WANTED HNN DIRECT STL. THE HNN-J134-STL DIDN'T EVEN ARISE AS A QUESTION UNTIL QUERIED BY ATC. WE WERE ALSO AWARE OF THE HNN-J134-STL DOGLEG. OUR DECISION WAS BASED ON THE ATC ISSUED PDC.
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.