Narrative:

Vectors to ILS at dfw runway 18R mixed IMC/VMC, 190 KIAS, heading 120 degrees, 3000 ft MSL. Runway 18R frequency tuned and idented. Cleared to heading of 150 degrees to intercept localizer and cleared for approach. Made turn to 150 degrees and selected ILS automatic capture (armed) on autoplt. After rolling out on 150 degree heading, noticed that localizer did not capture and aircraft flew through the localizer (approximately 3/10 NM at maximum distance). Immediately initiated turn back toward localizer and was in the turn when approach control called to turn to 190 degrees to reintercept localizer, observed on TCASII that no observed aircraft conflict existed with other aircraft, no warnings and closest aircraft appeared to be at 7:30 position at 3 - 3 1/2 NM and 1000 ft higher. That aircraft stated he had visual contact with us. Remainder of approach was uneventful. Opinion of contributing factors: 1) believe we were too close to the localizer by the time we were cleared for the approach and the automatic ILS capture was selected. Did not have time to properly arm. 2) fatigue was a large contributing factor. Was called out for this trip on reserve. Body was on pacific time and rotation was 4 days of early 'get-up's.' day #1 XB30 pacific. Day #2 XA30 pacific, day #3 XD45 pacific, day #4 XB00 pacific. If a choice is possible I always avoid the early get-up's. Do not sleep well the night before an early get-up. This happened on the last day of trip on the third leg of the day. Although reaction to non capture of localizer was fast, it may have been 2 seconds faster if crew was rested. 2 seconds is very critical during this phase!

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Original NASA ASRS Text

Title: AFTER HDG CLRNC FOR LOC INTERCEPT, ILS AUTO CAPTURE WAS ARMED FOR THE APCH, BUT THE ACFT DIDN'T CAPTURE THE LOC AND FLEW THROUGH THE COURSE. FLC CORRECTED BACK, BUT CTLR INTERVENED WITH A NEW INTERCEPT HDG. RPTR THINKS THE TURN IN TO INTERCEPT WAS TOO CLOSE TO THE LOC COURSE TO GET AN INSTANTANEOUS CAPTURE. ALSO, RPTR ATTRIBUTES FATIGUE TO SLOWER REACTION TIME BY FLC.

Narrative: VECTORS TO ILS AT DFW RWY 18R MIXED IMC/VMC, 190 KIAS, HDG 120 DEGS, 3000 FT MSL. RWY 18R FREQ TUNED AND IDENTED. CLRED TO HDG OF 150 DEGS TO INTERCEPT LOC AND CLRED FOR APCH. MADE TURN TO 150 DEGS AND SELECTED ILS AUTO CAPTURE (ARMED) ON AUTOPLT. AFTER ROLLING OUT ON 150 DEG HDG, NOTICED THAT LOC DID NOT CAPTURE AND ACFT FLEW THROUGH THE LOC (APPROX 3/10 NM AT MAX DISTANCE). IMMEDIATELY INITIATED TURN BACK TOWARD LOC AND WAS IN THE TURN WHEN APCH CTL CALLED TO TURN TO 190 DEGS TO REINTERCEPT LOC, OBSERVED ON TCASII THAT NO OBSERVED ACFT CONFLICT EXISTED WITH OTHER ACFT, NO WARNINGS AND CLOSEST ACFT APPEARED TO BE AT 7:30 POS AT 3 - 3 1/2 NM AND 1000 FT HIGHER. THAT ACFT STATED HE HAD VISUAL CONTACT WITH US. REMAINDER OF APCH WAS UNEVENTFUL. OPINION OF CONTRIBUTING FACTORS: 1) BELIEVE WE WERE TOO CLOSE TO THE LOC BY THE TIME WE WERE CLRED FOR THE APCH AND THE AUTO ILS CAPTURE WAS SELECTED. DID NOT HAVE TIME TO PROPERLY ARM. 2) FATIGUE WAS A LARGE CONTRIBUTING FACTOR. WAS CALLED OUT FOR THIS TRIP ON RESERVE. BODY WAS ON PACIFIC TIME AND ROTATION WAS 4 DAYS OF EARLY 'GET-UP'S.' DAY #1 XB30 PACIFIC. DAY #2 XA30 PACIFIC, DAY #3 XD45 PACIFIC, DAY #4 XB00 PACIFIC. IF A CHOICE IS POSSIBLE I ALWAYS AVOID THE EARLY GET-UP'S. DO NOT SLEEP WELL THE NIGHT BEFORE AN EARLY GET-UP. THIS HAPPENED ON THE LAST DAY OF TRIP ON THE THIRD LEG OF THE DAY. ALTHOUGH REACTION TO NON CAPTURE OF LOC WAS FAST, IT MAY HAVE BEEN 2 SECONDS FASTER IF CREW WAS RESTED. 2 SECONDS IS VERY CRITICAL DURING THIS PHASE!

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.