THIS ACR B727-200 FLC MISREAD A PORTION OF THEIR DEP INSTRUCTIONS THAT REQUIRED THEM TO TURN BACK TO THE BZN VOR AFTER CLBING TO 8000 FT. THE RPTR SAID THAT THE INSTRUCTIONS WERE MISLEADING TO HIM SINCE THE EXCEPTIONS TO THE RTE PORTION COMES BEFORE THE REMAINDER OF THE REGULAR RTE INSTRUCTIONS.

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PLTS MISUNDERSTOOD CLRNC ON THE DEP FROM BZN. BELIEVED CLRNC TO REQUIRE ON RWY 30 A CLBING L TURN TO 275 DEG HDG TO INTERCEPT THE BZN 284 DEG RADIAL. THE PROC REQUIRES A CLB TO 8000 FT THEN A TURN TO THE BZN VOR. PLTS DID NOT TURN TO THE BZN VOR; BUT CONTINUED OUT THE 284 DEG RADIAL W TO CLRNC LIMIT ALT OF 14000 FT. ON INITIAL CONTACT WITH ZLC PLTS' WERE INSTRUCTED TO CONTACT ZLC AGAIN AT 10 DME FROM BZN VOR. THE CALL WAS MADE AND ATC QUESTIONED OUR CLRNC. ATC THEN ASSIGNED US A VECTOR ON COURSE. CONTRIBUTING FACTORS WERE PLTS' CAREFUL ATTN TO TERRAIN AVOIDANCE (MEA) AND ADHERENCE TO THE BELIEVED CLRNC. THE PROC IS WRITTEN IN A MANNER THAT MAY LEAD TO CONFUSION. THE PLTS BELIEVED THAT THE PROC ENDED ON COURSE OUTBOUND THE BZN 284 DEG RADIAL BECAUSE THE NEXT SENTENCE STARTS WITH THE EXCEPTION TO THE CLRNC; WBOUND ACFT; RATHER THAN 'ALL OTHER' ACFT. REWRITING THE DEP PROC MIGHT HELP PREVENT A RECURRENCE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THIS CAPT WAS FLYING A B727- 200 OUT OF BZN WHEN AN IMPORTANT PORTION OF THE DEP PROC WAS OVERLOOKED BY THE FLC. THIS PORTION OF THE DEP INSTRUCTIONS REQUIRED THE FLC TO TURN BACK TO THE BZN VOR AFTER CLBING TO 8000 FT. THE CAPT SAID THAT HE IS FAMILIAR WITH MOUNTAIN FLYING AND WITH COMPLICATED DEP INSTRUCTIONS; HOWEVER; HE SAID THAT HE HAS NOT SEEN INSTRUCTIONS THAT ADDRESS EXCEPTIONS TO THE NORMAL RTE AND THEN FURTHER ADD INSTRUCTIONS TO THE NORMAL RTE. HE SAID THAT EVERYONE ON THE FLC MISSED THESE INSTRUCTIONS AND HE BELIEVES THAT THE WAY THAT THEY ARE WRITTEN WAS THE PRIMARY CAUSE FOR THE ERROR.