Narrative:

Entered left downwind runway 30, mtj, colorado. Noted aircraft taxiing out, no calls made to unicom for advisories. One other aircraft in pattern on a left crosswind. Approach and landing normal. We missed the turnoff for the terminal. First officer announced to unicom and traffic that we would make a 180 degree turn and back-taxi on runway 30. As I turned the aircraft and started to back-taxi, I noticed an aircraft departing, while we were taxiing on the runway. The aircraft flew north of the runway centerline and departed the pattern to the east with the right turn out. Several attempts were made to raise the aircraft on the unicom frequency.

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Original NASA ASRS Text

Title: AFTER LNDG AT UNCONTROLLED ARPT AND WHILE TAXIING BACK TO TERMINAL TURNOFF REPORTER ACFT OBSERVED ANOTHER ACFT DEPART THE SAME RWY.

Narrative: ENTERED LEFT DOWNWIND RWY 30, MTJ, COLORADO. NOTED ACFT TAXIING OUT, NO CALLS MADE TO UNICOM FOR ADVISORIES. ONE OTHER ACFT IN PATTERN ON A LEFT XWIND. APCH AND LNDG NORMAL. WE MISSED THE TURNOFF FOR THE TERMINAL. F/O ANNOUNCED TO UNICOM AND TFC THAT WE WOULD MAKE A 180 DEG TURN AND BACK-TAXI ON RWY 30. AS I TURNED THE ACFT AND STARTED TO BACK-TAXI, I NOTICED AN ACFT DEPARTING, WHILE WE WERE TAXIING ON THE RWY. THE ACFT FLEW NORTH OF THE RWY CENTERLINE AND DEPARTED THE PATTERN TO THE EAST WITH THE RIGHT TURN OUT. SEVERAL ATTEMPTS WERE MADE TO RAISE THE ACFT ON THE UNICOM FREQ.

Data retrieved from NASA's ASRS site as of August 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.