MD80 DEP FROM SEA IS QUESTIONED BY CTLR FOR EARLY TURN ON MOUNTAIN FIVE DEP OFF RWY 34R.

Narrative

DEPARTING SEA ON RWY 34R ON THE MOUNTAIN FIVE DEP; WE BEGAN OUR TURN TO 070 DEGS AT 8 DME OFF OF SEA VOR 341 DEG RADIAL ABOVE 4000 FT. I CALLED THE TURN AS A COURTESY TO THE CTLR SINCE IT'S SUCH A LARGE HDG CHANGE AND HAS 2 CONSTRAINTS ASSOCIATED WITH IT. THE CTLR SAID HE SHOWED US 2 MI SHORT. WE XCHKED OUR DME AND IT NOW SHOWED IN EXCESS OF 8 DME AND WE RELAYED THIS INFO TO THE CTLR. HE SAID HE STILL SHOWED US TO BE ABOUT 2 MI SHORT AND TO MAINTAIN HDG FOR THE TURN. WE COMPLIED WITH HIS INSTRUCTIONS AND DEPARTED WITHOUT FURTHER INCIDENT. AFTER LNDG AT ORD I CALLED THE CTLR; XXXX AT XXX TO DISCUSS THE INCIDENT. HE SAID THE VERY NEXT DEP DID THE VERY SAME THING AND THAT THIS IS A RECURRING PROB ON N FLOW OPS ON THE MOUNTAIN FIVE DEP. HE SAID NO DEVS WOULD BE FILED BUT WHEN HE TRIED TO CALL SEATTLE OPS; HE WAS REFERRED TO SYS OPS; WHO SHUFFLED HIM OVER TO NAV DATA WHERE HE SAID HE MET WITH LITTLE INTEREST IN THE MATTER. SINCE THIS PROB OCCURS IN BUNCHES ACCORDING TO THE CTLR DURING N FLOW OP IT MIGHT BE A SCOPE CALIBRATION OR NAVAID PROB. IN ANY EVENT; IT WOULD BE A GOOD IDEA TO WORK WITH A CTLR WHO IS TRYING TO WORK WITH US.