ALT BUST. FLC DISTR.

Narrative

THE CAPT AND I WERE FLYING FROM EUGENE TO SEATTLE IN A SA-227; METRO III (EUG CVO DIRECT UBG DIRECT OLM OLM1 SEA). WE WERE CLBING TO OUR CRUISE ALT OF FL180. APPROX 2 MINS AFTER LEVELING OFF (NO AUTOPLT); I GLANCED DOWN AT SOME PAPERWORK AND THE AIRPLANE CONTINUED TO CLB. THE ALT ALERTER FAILED TO GO OFF. I WAS NOT PAYING PROPER ATTN. WHEN I LOOKED UP I SIMPLY LEVELED OFF AT FL190. AS SOON AS I DID SO; I REALIZED MY MISTAKE. SIMULTANEOUSLY; THE CTLR QUESTIONED MY ALT AT FL190. I PUT THE XPONDER ON STANDBY AND THE CAPT REPLIED WE WERE AT FL180. WE THEN IMMEDIATELY DSNDED TO FL180 AND TURNED THE XPONDER BACK ON. DURING THE ORDEAL; WE CHANGED CTLRS AND PASSED UBG VOR. WE WERE ABOUT 25 MI LATE IN MAKING A SLIGHT TURN TO THE L AFTER THE VOR. THE FOLLOWING CTLR ASKED US ABOUT OUR COURSE AND WE THEN CORRECTED. THE FLT CONTINUED SMOOTHLY AFTER THAT. SUPPLEMENTAL INFO FROM ACN 262650: AT THIS TIME; WE WERE XING UBG VOR AND; IN THE CONFUSION; WE WERE LATE IN MAKING A 10 DEG HDG CHANGE FOR OLM VOR. THIS WAS DUE TO A CLRNC CHANGE OF DIRECT OLM AFTER UBG INSTEAD OF OUR FILED RTE.