Narrative:

Location: 15 NM north of jen VOR on jen 5 arrival, 2.8 NM left of 039 degree radial. In GPS navigation mode, more than 30 NM from destination, leveling at 11000 ft, slowing to 250 KTS for restr on arrival. Autoplt in manual mode. CDI 1 needle right, correcting right. ATC called, 'turn right 20 degrees.' error caused by forgetting GPS lateral deviation referenced to 30 NM from destination, not navigation facility. We were 50 NM from destination, en route mode. 1 DOT on arrival exceeds ATC limits. Contributing to error: first officer (PNF) not tuned to jen with 39 degree radial. Supplemental information from acn 441362: crossed jen VORTAC and drifted left of centerline. Crew noticed error and we were correcting back to centerline when ATC called us left. I checked GPS, which showed only 2.8 mi left of course. CDI indicated 1 1/4 dots left of 039 degree radial. Supplemental information from acn 441167: captain's leg. I was flight engineer and passing 11800 ft for 11000 ft. Flight attendant came in to report a write-up. I was busy entering it and calling maintenance and was not monitoring the arrival. The first officer mentioned to the captain that we were still in manual and that we needed to come to the right to intercept the 039 degree radial. Were in manual and thought we were in navigation. I allowed myself to be distraction on the arrival. I thought about doing it later (calling maintenance) and checked our altitude and decided that I would do it as we were above 10000 ft. Next time I will do it on the ground.

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Original NASA ASRS Text

Title: A B727 DRIFTS L OF THE OUTBOUND RADIAL OF JEN VORTAC DURING THE JEN 5 ARR INTO DFW, TX.

Narrative: LOCATION: 15 NM N OF JEN VOR ON JEN 5 ARR, 2.8 NM L OF 039 DEG RADIAL. IN GPS NAV MODE, MORE THAN 30 NM FROM DEST, LEVELING AT 11000 FT, SLOWING TO 250 KTS FOR RESTR ON ARR. AUTOPLT IN MANUAL MODE. CDI 1 NEEDLE R, CORRECTING R. ATC CALLED, 'TURN R 20 DEGS.' ERROR CAUSED BY FORGETTING GPS LATERAL DEV REFED TO 30 NM FROM DEST, NOT NAV FACILITY. WE WERE 50 NM FROM DEST, ENRTE MODE. 1 DOT ON ARR EXCEEDS ATC LIMITS. CONTRIBUTING TO ERROR: FO (PNF) NOT TUNED TO JEN WITH 39 DEG RADIAL. SUPPLEMENTAL INFO FROM ACN 441362: CROSSED JEN VORTAC AND DRIFTED L OF CTRLINE. CREW NOTICED ERROR AND WE WERE CORRECTING BACK TO CTRLINE WHEN ATC CALLED US L. I CHKED GPS, WHICH SHOWED ONLY 2.8 MI L OF COURSE. CDI INDICATED 1 1/4 DOTS L OF 039 DEG RADIAL. SUPPLEMENTAL INFO FROM ACN 441167: CAPT'S LEG. I WAS FE AND PASSING 11800 FT FOR 11000 FT. FLT ATTENDANT CAME IN TO RPT A WRITE-UP. I WAS BUSY ENTERING IT AND CALLING MAINT AND WAS NOT MONITORING THE ARR. THE FO MENTIONED TO THE CAPT THAT WE WERE STILL IN MANUAL AND THAT WE NEEDED TO COME TO THE R TO INTERCEPT THE 039 DEG RADIAL. WERE IN MANUAL AND THOUGHT WE WERE IN NAV. I ALLOWED MYSELF TO BE DISTR ON THE ARR. I THOUGHT ABOUT DOING IT LATER (CALLING MAINT) AND CHKED OUR ALT AND DECIDED THAT I WOULD DO IT AS WE WERE ABOVE 10000 FT. NEXT TIME I WILL DO IT ON THE GND.

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.