Narrative:

We received our flight clearance via an onboard computer with a printer. I misread the departure instructions to read radar vectors to join J-90 outbound from sea. The captain asked me if we were to comply with the mountain 2. I said no, we were being vectored to join J-90. He failed to look at the clearance himself, thus relying on my interpretation of the clearance. During climb out from ksea, runway 34L at approximately 13-14 mi, the departure controller called and asked if we were given the mountain 2 with our departure. I responded no, however, upon further investigation of the clearance, I realized I had misread the clearance. We should have begun a turn at sea 8 DME. The controller issued a turn to us after asking us about the departure. The situation occurred because I misread the clearance, the captain failed to look at the clearance and the controller never called us until we were 5-6 mi past the initial turn. There were never any conflicts or evasive actions taken. I have relearned the importance of checking and rechking a clearance and the need for both pilots to back each other up. Supplemental information from acn 233220: we received our ATC clearance via ACARS and it is printed out on a strip the first officer places below the transponder on his side of the center pedestal. I've also changed my habits and now place the strip on my side of the console.

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Original NASA ASRS Text

Title: RECEIVED PRE-DEPARTURE CLRNC, MISINTERPRETED CLRNC. TRACON VECTORED TO CORRECT.

Narrative: WE RECEIVED OUR FLT CLRNC VIA AN ONBOARD COMPUTER WITH A PRINTER. I MISREAD THE DEP INSTRUCTIONS TO READ RADAR VECTORS TO JOIN J-90 OUTBOUND FROM SEA. THE CAPT ASKED ME IF WE WERE TO COMPLY WITH THE MOUNTAIN 2. I SAID NO, WE WERE BEING VECTORED TO JOIN J-90. HE FAILED TO LOOK AT THE CLRNC HIMSELF, THUS RELYING ON MY INTERP OF THE CLRNC. DURING CLBOUT FROM KSEA, RWY 34L AT APPROX 13-14 MI, THE DEP CTLR CALLED AND ASKED IF WE WERE GIVEN THE MOUNTAIN 2 WITH OUR DEP. I RESPONDED NO, HOWEVER, UPON FURTHER INVESTIGATION OF THE CLRNC, I REALIZED I HAD MISREAD THE CLRNC. WE SHOULD HAVE BEGUN A TURN AT SEA 8 DME. THE CTLR ISSUED A TURN TO US AFTER ASKING US ABOUT THE DEP. THE SIT OCCURRED BECAUSE I MISREAD THE CLRNC, THE CAPT FAILED TO LOOK AT THE CLRNC AND THE CTLR NEVER CALLED US UNTIL WE WERE 5-6 MI PAST THE INITIAL TURN. THERE WERE NEVER ANY CONFLICTS OR EVASIVE ACTIONS TAKEN. I HAVE RELEARNED THE IMPORTANCE OF CHKING AND RECHKING A CLRNC AND THE NEED FOR BOTH PLTS TO BACK EACH OTHER UP. SUPPLEMENTAL INFO FROM ACN 233220: WE RECEIVED OUR ATC CLRNC VIA ACARS AND IT IS PRINTED OUT ON A STRIP THE FO PLACES BELOW THE XPONDER ON HIS SIDE OF THE CTR PEDESTAL. I'VE ALSO CHANGED MY HABITS AND NOW PLACE THE STRIP ON MY SIDE OF THE CONSOLE.

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.