Narrative:

Flight originated singapore nonstop to tokyo 'narita.' the flight was operated normally en route using INS and xchks various points along our route with ADF and VOR facilities. We operated along filed route #2J 2970 NM distance at 5:54 flight plan time. As flight progressed into tokyo area, flight was requested to contact tokyo control on 125.9 at bobot intersection. At bobot I gave position report to tyo radio and checked in with tokyo control 125.9. At this time I noticed 'by reference my VOR selected to mje VOR 117.8 'miyakejima' airway G581 248 radial. That we were tracking right of course. I brought this to the attention of first officer who was flying the aircraft. He immediately started correction to left to regain centerline. While we had already initiated this correction tokyo control called us and said 'I show you right of course.' I advised as correcting. We regained centerline. Tokyo control made no further comment. We received normal descent clrncs, and descended into tokyo 'narita arrival area' and landed in narita on runway 34 ILS straight in. WX VFR. This situation did not cause any traffic conflicts. Causal relationship: cockpit crew very fatigued from series of events. 9 day planned trip became a marathon of endurance because of constant rescheduling of this crew by the company! Callback conversation with reporter revealed the following information: our company schedulers go strictly by the book of duty rules -- never considering how our bodies may be screaming illegal -- if it is legal by the book we have to go. This results in bone weary fatigue frequently, resulting in many flight crew human factor errors. It is our own doing of course. We negotiate the duty rules and ask for more money so the company wants to get their monies worth. Too often, however, we suffer extreme fatigue.

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Original NASA ASRS Text

Title: WDB FLT ENRTE TO NARITA WAS OBSERVED BY NARITA CTL AS BEING OFF COURSE. CORRECTION WAS BEING MADE BACK ON COURSE BY FLC, NOTHING MORE SAID.

Narrative: FLT ORIGINATED SINGAPORE NONSTOP TO TOKYO 'NARITA.' THE FLT WAS OPERATED NORMALLY ENRTE USING INS AND XCHKS VARIOUS POINTS ALONG OUR RTE WITH ADF AND VOR FACILITIES. WE OPERATED ALONG FILED RTE #2J 2970 NM DISTANCE AT 5:54 FLT PLAN TIME. AS FLT PROGRESSED INTO TOKYO AREA, FLT WAS REQUESTED TO CONTACT TOKYO CTL ON 125.9 AT BOBOT INTXN. AT BOBOT I GAVE POS RPT TO TYO RADIO AND CHKED IN WITH TOKYO CTL 125.9. AT THIS TIME I NOTICED 'BY REF MY VOR SELECTED TO MJE VOR 117.8 'MIYAKEJIMA' AIRWAY G581 248 RADIAL. THAT WE WERE TRACKING R OF COURSE. I BROUGHT THIS TO THE ATTN OF FO WHO WAS FLYING THE ACFT. HE IMMEDIATELY STARTED CORRECTION TO L TO REGAIN CENTERLINE. WHILE WE HAD ALREADY INITIATED THIS CORRECTION TOKYO CTL CALLED US AND SAID 'I SHOW YOU R OF COURSE.' I ADVISED AS CORRECTING. WE REGAINED CENTERLINE. TOKYO CTL MADE NO FURTHER COMMENT. WE RECEIVED NORMAL DSCNT CLRNCS, AND DSNDED INTO TOKYO 'NARITA ARR AREA' AND LANDED IN NARITA ON RWY 34 ILS STRAIGHT IN. WX VFR. THIS SITUATION DID NOT CAUSE ANY TFC CONFLICTS. CAUSAL RELATIONSHIP: COCKPIT CREW VERY FATIGUED FROM SERIES OF EVENTS. 9 DAY PLANNED TRIP BECAME A MARATHON OF ENDURANCE BECAUSE OF CONSTANT RESCHEDULING OF THIS CREW BY THE COMPANY! CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: OUR COMPANY SCHEDULERS GO STRICTLY BY THE BOOK OF DUTY RULES -- NEVER CONSIDERING HOW OUR BODIES MAY BE SCREAMING ILLEGAL -- IF IT IS LEGAL BY THE BOOK WE HAVE TO GO. THIS RESULTS IN BONE WEARY FATIGUE FREQUENTLY, RESULTING IN MANY FLC HUMAN FACTOR ERRORS. IT IS OUR OWN DOING OF COURSE. WE NEGOTIATE THE DUTY RULES AND ASK FOR MORE MONEY SO THE COMPANY WANTS TO GET THEIR MONIES WORTH. TOO OFTEN, HOWEVER, WE SUFFER EXTREME FATIGUE.

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.