Narrative:

As captain of flight from bzn-bil, I taxied to runway 30 for departure. It was necessary for us to wait several mins for IFR release from slc center due to an inbound other airlines flight. We were monitoring both ATC FSS advisory frequencys to ascertain the positions of other aircraft, yet we heard no traffic in the bozeman area. After receiving IFR release from slc center, we broadcast on FSS advisory that we were about to depart runway 30. I then began to taxi into position for departure. About the time I was centering the aircraft on the runway, a voice came on the advisory frequency and said 'air carrier X, do you see the small aircraft departing 12.' at first neither myself or the first officer saw anything. Suddenly, against the backdrop of the mountain, over a mi away we did see an small aircraft Y departing 12 and heading our way. It took off and turned on to it's departure path, presenting no further conflict. Why didn't we see it? Factors. 1. No radio reports from the small aircraft Y of it's intention. 2. The runway at bzn is high in the middle and low on each end. Hence the taxiways approaching 12 and the departure end itself are not visible from the departure end of 20.

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Original NASA ASRS Text

Title: TKOF ON OCCUPIED RWY BY SMA. UNAUTH UNCOORD RWY ENTRY BY ACR ON A SINGLE RWY OP, OPPOSITE DIRECTION TFC.

Narrative: AS CAPT OF FLT FROM BZN-BIL, I TAXIED TO RWY 30 FOR DEP. IT WAS NECESSARY FOR US TO WAIT SEVERAL MINS FOR IFR RELEASE FROM SLC CENTER DUE TO AN INBOUND OTHER AIRLINES FLT. WE WERE MONITORING BOTH ATC FSS ADVISORY FREQS TO ASCERTAIN THE POSITIONS OF OTHER ACFT, YET WE HEARD NO TFC IN THE BOZEMAN AREA. AFTER RECEIVING IFR RELEASE FROM SLC CENTER, WE BROADCAST ON FSS ADVISORY THAT WE WERE ABOUT TO DEPART RWY 30. I THEN BEGAN TO TAXI INTO POS FOR DEP. ABOUT THE TIME I WAS CENTERING THE ACFT ON THE RWY, A VOICE CAME ON THE ADVISORY FREQ AND SAID 'ACR X, DO YOU SEE THE SMA DEPARTING 12.' AT FIRST NEITHER MYSELF OR THE FO SAW ANYTHING. SUDDENLY, AGAINST THE BACKDROP OF THE MOUNTAIN, OVER A MI AWAY WE DID SEE AN SMA Y DEPARTING 12 AND HDG OUR WAY. IT TOOK OFF AND TURNED ON TO IT'S DEP PATH, PRESENTING NO FURTHER CONFLICT. WHY DIDN'T WE SEE IT? FACTORS. 1. NO RADIO RPTS FROM THE SMA Y OF IT'S INTENTION. 2. THE RWY AT BZN IS HIGH IN THE MIDDLE AND LOW ON EACH END. HENCE THE TAXIWAYS APCHING 12 AND THE DEP END ITSELF ARE NOT VISIBLE FROM THE DEP END OF 20.

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.