<< >> NASA ASRS Report 382753, October 1997

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.

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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.