Narrative:

While we were holding at the departure end of runway 10L, we heard pdx tower controller clear a cessna to cross midfield and enter a north or left downwind to runway 10L. The controller then cleared us for takeoff. In my mind there was absolutely no chance of a problem because this overhead crossing traffic would be well behind us and much higher. Immediately after departure we encountered the C210 about 1 1/2 mi off the departure end of runway 10L descending and turning toward us from approximately 1000 ft AGL. Obviously the cessna had not complied with his instructions and was actually much closer to the crosswind leg. Also, the tower controller had not verified that he had complied with her instructions. Our acceleration height to clean up our takeoff confign (flaps up) was 688 ft, which we never reached. I reduced climb power and performed a descending l-hand turn to avoid a collision. We exceeded the takeoff flap speed limitation during this maneuver. We departed the SID for a bit to fly our evasive maneuver. The TCASII once again was a valuable tool. Luckily, I sighted the traffic at our 2 O'clock position once we got the gear up. I then used the TCASII to plan my escape route. We never got a TA or RA because I knew at our rapid climb rate we might possibly collide with the airplane if we waited that long. So I began my evasive maneuvering as soon as I saw the cessna. Supplemental information from acn 500613: I think I may have been a little east of midfield and a little slow to start my left turn to downwind. I may have descended a little too quickly from over the tower and not heard maintain 1500 ft until north of the tower. I know I was north of the tower and east 100 ft or so. Another pilot was in the passenger seat to my right and commented that the departing flight passed under us. It was dark. I asked him if it was close. He said it was hard to tell, but maybe 300-400 ft between us.

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Original NASA ASRS Text

Title: A DHC8B CREW TOOK EVASIVE ACTION ON DEP.

Narrative: WHILE WE WERE HOLDING AT THE DEP END OF RWY 10L, WE HEARD PDX TWR CTLR CLR A CESSNA TO CROSS MIDFIELD AND ENTER A N OR L DOWNWIND TO RWY 10L. THE CTLR THEN CLRED US FOR TKOF. IN MY MIND THERE WAS ABSOLUTELY NO CHANCE OF A PROB BECAUSE THIS OVERHEAD XING TFC WOULD BE WELL BEHIND US AND MUCH HIGHER. IMMEDIATELY AFTER DEP WE ENCOUNTERED THE C210 ABOUT 1 1/2 MI OFF THE DEP END OF RWY 10L DSNDING AND TURNING TOWARD US FROM APPROX 1000 FT AGL. OBVIOUSLY THE CESSNA HAD NOT COMPLIED WITH HIS INSTRUCTIONS AND WAS ACTUALLY MUCH CLOSER TO THE XWIND LEG. ALSO, THE TWR CTLR HAD NOT VERIFIED THAT HE HAD COMPLIED WITH HER INSTRUCTIONS. OUR ACCELERATION HEIGHT TO CLEAN UP OUR TKOF CONFIGN (FLAPS UP) WAS 688 FT, WHICH WE NEVER REACHED. I REDUCED CLB PWR AND PERFORMED A DSNDING L-HAND TURN TO AVOID A COLLISION. WE EXCEEDED THE TKOF FLAP SPD LIMITATION DURING THIS MANEUVER. WE DEPARTED THE SID FOR A BIT TO FLY OUR EVASIVE MANEUVER. THE TCASII ONCE AGAIN WAS A VALUABLE TOOL. LUCKILY, I SIGHTED THE TFC AT OUR 2 O'CLOCK POS ONCE WE GOT THE GEAR UP. I THEN USED THE TCASII TO PLAN MY ESCAPE RTE. WE NEVER GOT A TA OR RA BECAUSE I KNEW AT OUR RAPID CLB RATE WE MIGHT POSSIBLY COLLIDE WITH THE AIRPLANE IF WE WAITED THAT LONG. SO I BEGAN MY EVASIVE MANEUVERING AS SOON AS I SAW THE CESSNA. SUPPLEMENTAL INFO FROM ACN 500613: I THINK I MAY HAVE BEEN A LITTLE E OF MIDFIELD AND A LITTLE SLOW TO START MY L TURN TO DOWNWIND. I MAY HAVE DSNDED A LITTLE TOO QUICKLY FROM OVER THE TWR AND NOT HEARD MAINTAIN 1500 FT UNTIL N OF THE TWR. I KNOW I WAS N OF THE TWR AND E 100 FT OR SO. ANOTHER PLT WAS IN THE PAX SEAT TO MY R AND COMMENTED THAT THE DEPARTING FLT PASSED UNDER US. IT WAS DARK. I ASKED HIM IF IT WAS CLOSE. HE SAID IT WAS HARD TO TELL, BUT MAYBE 300-400 FT BTWN US.

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.