Narrative:

Tower cleared us for departure with a right turn to heading 120 degrees. At 4200 ft MSL started right turn to 120 degree heading. Almost immediately we received a TA. Tower told us to turn further to 150 degree heading. At 4900 ft we received a descending RA. We followed TCASII instructions and received a clear of conflict. Aircraft in question was never seen. Red RA square passed to the left of the aircraft image on the TCASII instrument dial. After we were through 10000 ft and on our way I called back and asked about the other aircraft. I do not remember if it was tower or departure that I spoke with, but they informed me that they had an aircraft on an approach from the east. Information XXXX was current, 050 degrees at 8 KTS 10 mi visibility clear runway 32/10 altimeter 30.10 inches runway 10L in use. As we were cleared for departure and on takeoff roll I saw no aircraft in our path. I do question the separation standards used to have an aircraft on approach from the east and departing a jet airliner to the east.

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Original NASA ASRS Text

Title: EVASIVE ACTION REQUIRED BY THE FLT CREW OF A DEP DC9 WHEN TCASII ALERTS THEM TO TFC DURING THEIR DEP TURN OUT AFTER TKOF FROM BIL, MT.

Narrative: TWR CLRED US FOR DEP WITH A R TURN TO HEADING 120 DEGS. AT 4200 FT MSL STARTED R TURN TO 120 DEG HDG. ALMOST IMMEDIATELY WE RECEIVED A TA. TWR TOLD US TO TURN FURTHER TO 150 DEG HDG. AT 4900 FT WE RECEIVED A DSNDING RA. WE FOLLOWED TCASII INSTRUCTIONS AND RECEIVED A CLR OF CONFLICT. ACFT IN QUESTION WAS NEVER SEEN. RED RA SQUARE PASSED TO THE L OF THE ACFT IMAGE ON THE TCASII INST DIAL. AFTER WE WERE THROUGH 10000 FT AND ON OUR WAY I CALLED BACK AND ASKED ABOUT THE OTHER ACFT. I DO NOT REMEMBER IF IT WAS TWR OR DEP THAT I SPOKE WITH, BUT THEY INFORMED ME THAT THEY HAD AN ACFT ON AN APCH FROM THE E. INFO XXXX WAS CURRENT, 050 DEGS AT 8 KTS 10 MI VISIBILITY CLR RWY 32/10 ALTIMETER 30.10 INCHES RWY 10L IN USE. AS WE WERE CLRED FOR DEP AND ON TKOF ROLL I SAW NO ACFT IN OUR PATH. I DO QUESTION THE SEPARATION STANDARDS USED TO HAVE AN ACFT ON APCH FROM THE E AND DEPARTING A JET AIRLINER TO THE E.

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.