A C340 PLT MISREAD THE SALT LAKE SID WHICH CAUSED HIM TO TURN AND CROSS IN FRONT OF RWYS 34L&R AT SLC.

Narrative

WX WAS IMC; WITH 500 FT CEILING. I WAS ASSIGNED THE SLC 8 DEP FROM SLC; DEPARTING FROM RWY 35. THIS PROC ACTUALLY INCLUDES 2 VERY DETAILED PROCS; A NORMAL PROC; AND A LOST COMS PROC. THE NORMAL PROC IS FAIRLY SIMPLE; REQUIRING YOU TO FLY 340 DEGS (CLOSE TO STRAIGHT OUT) OR ASSIGNED HDG AND EXPECT VECTORS. THE LOST COMS PROC IS MORE COMPLICATED; REQUIRING A L TURN TO 249 DEGS AT THE WASACH VOR; 5 MI FROM THE ARPT; AND ENTRY INTO A HOLDING PATTERN. ON TAKING THE RWY; THE CTLR ASSIGNED ME A HDG OF 340 DEGS. HOWEVER; ON DEPARTING; I MISTAKENLY FOLLOWED THE LOST COMS PROC. THUS; AFTER DEP; I FLEW 340 DEGS TO WASACH. BUT UPON REACHING WASACH; INSTEAD OF CONTINUING STRAIGHT AHEAD ON THE 340 DEG HDG; I TURNED L TO 249 DEGS. THIS TURNED ME ACROSS 2 OTHER RWYS (RWY 34L&R). LUCKILY; NO OTHER ACFT WERE DEPARTING AT THE TIME AND THERE WAS NO LOSS OF SEPARATION. I BELIEVE THAT THIS HAPPENED BECAUSE; IN THE GRAY LIGHT; I FAILED TO SEE THE GRAY INDICATIONS ON MY CHART THAT INDICATED I WAS LOOKING AT THE LOST COMS PROC INSTEAD OF THE NORMAL PROC. THIS PROB COULD HAVE BEEN AVOIDED IN A NUMBER OF WAYS. FIRST; I COULD HAVE LOOKED MORE CAREFULLY AT THE CHART; OR EVEN USED COCKPIT LIGHTING; DESPITE THE FACT THAT IT WAS DAYTIME; TO MAKE SURE I WAS SEEING CORRECTLY IN THE DIM LIGHT. SECOND; I SHOULD HAVE READ THE WHOLE CHART MORE CAREFULLY. HAD I DONE SO; I WOULD HAVE REALIZED THAT THERE WERE 2 PROCS SET OUT ON THE CHART; AND WOULD THEN HAVE THOUGHT TO TRY TO FIGURE OUT THE DIFFERENCE BTWN THE TWO; INSTEAD OF ASSUMING THAT THERE WAS JUST ONE AND FOLLOWING IT. THIRD; I SHOULD HAVE ASKED FOR CLARIFICATION. WHEN I RECEIVED THE ASSIGNED 340 DEG HDG ON TAKING THE RWY; I SHOULD HAVE ASKED WHETHER THE CTLR WANTED ME TO FLY THAT HDG UNTIL WASACH; OR UNTIL I RECEIVED A DIFFERENT VECTOR. ALTHOUGH I MIGHT HAVE FELT A LITTLE STUPID ASKING ABOUT SOMETHING THAT SEEMED OBVIOUS; I WOULD HAVE FELT LESS STUPID THAN I DID WHEN THE CTLR POINTEDLY ASKED ME WHY I WAS TURNING L. WHEN IN DOUBT -- THE SLIGHTEST DOUBT -- ASK! ALSO; ALTHOUGH COMMERCIAL CHART PUBLISHER CLRLY TRIED TO DEMARCATE THE LOST COMS PROC; THEY MAY WANT TO THINK ABOUT WAYS TO DO SO THAT WILL BE MORE APPARENT IN LOW; GRAY LIGHT. (I UNDERSTAND THAT THEY MUST ALSO DO SO IN A WAY THAT DOES NOT DISTRACT TOO MUCH; AND THAT GRAY LETTERING IS A GOOD WAY TO DO THAT.)