Captain of a B757 failed to follow assigned track when he forgot to reset the aircraft flight director computer back to LNAV after leveling off in cruise and the aircraft wandered off the assigned airway. ATC intervened and the captain brought the aircraft back to intended course.

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Attributes
ACN	352000
Time
Date	199611
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ldn
State Reference	VA
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
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
ASRS Report	351000
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were on J6 near colns intersection, prior to hvq. MCP was in heading mode when it should have been in LNAV. As aircraft departed airway at a turning point, ATC advised us that we were off the filed airway. We then returned to course. Captain had left system in heading after trimming the aircraft at cruise altitude.

Original NASA ASRS Text

Title: CAPT OF A B757 FAILED TO FOLLOW ASSIGNED TRACK WHEN HE FORGOT TO RESET THE ACFT FLT DIRECTOR COMPUTER BACK TO LNAV AFTER LEVELING OFF IN CRUISE AND THE ACFT WANDERED OFF THE ASSIGNED AIRWAY. ATC INTERVENED AND THE CAPT BROUGHT THE ACFT BACK TO INTENDED COURSE.

Narrative: WE WERE ON J6 NEAR COLNS INTXN, PRIOR TO HVQ. MCP WAS IN HDG MODE WHEN IT SHOULD HAVE BEEN IN LNAV. AS ACFT DEPARTED AIRWAY AT A TURNING POINT, ATC ADVISED US THAT WE WERE OFF THE FILED AIRWAY. WE THEN RETURNED TO COURSE. CAPT HAD LEFT SYS IN HDG AFTER TRIMMING THE ACFT AT CRUISE ALT.

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.