Flight crew of an medium large transport air carrier aircraft inadvertently deviated from assigned track due to not following a change to their filed routing received by pre departure clearance.

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Attributes
ACN	244337
Time
Date	199306
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : rdu
State Reference	NC
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 18000 flight time type : 9000
ASRS Report	244337
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : clearance other anomaly other other spatial deviation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We received our clearance through ACARS. The first part of the clearance was the same as the filed route of flight, but there was a change to the routing at about the midpoint of the route with a return to our filed routing shortly thereafter. For some reason, we didn't catch the change. The center controller was very sharp, and caught us before we got too far off course. Even though I read the clearance off the ACARS screen, for some reason I 'saw' what I expected and not what was really there.

Original NASA ASRS Text

Title: FLC OF AN MLG ACR ACFT INADVERTENTLY DEVIATED FROM ASSIGNED TRACK DUE TO NOT FOLLOWING A CHANGE TO THEIR FILED RTING RECEIVED BY PRE DEP CLRNC.

Narrative: WE RECEIVED OUR CLRNC THROUGH ACARS. THE FIRST PART OF THE CLRNC WAS THE SAME AS THE FILED RTE OF FLT, BUT THERE WAS A CHANGE TO THE RTING AT ABOUT THE MIDPOINT OF THE RTE WITH A RETURN TO OUR FILED RTING SHORTLY THEREAFTER. FOR SOME REASON, WE DIDN'T CATCH THE CHANGE. THE CTR CTLR WAS VERY SHARP, AND CAUGHT US BEFORE WE GOT TOO FAR OFF COURSE. EVEN THOUGH I READ THE CLRNC OFF THE ACARS SCREEN, FOR SOME REASON I 'SAW' WHAT I EXPECTED AND NOT WHAT WAS REALLY THERE.

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.