A B737-300 PLT QUESTIONS THE LEGALITY OF DISPATCHING FOR THE RNO SILVER ILS IF BOTH THE FMG AND NO ARE INOP BECAUSE NO MISSED APCH NAVAIDS ARE AVAILABLE.

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UPON RECEIVING A PREDEP BRIEFING FROM DISPATCH; I REALIZED THAT WITH BOTH FMG VOR AND NO LMM OTS WE WOULD BE UNABLE TO COMPLY WITH THE SINGLE ENG CLBOUT PROC REQUIRED FOR THE SILVER ILS RWY 16R. THE VISIBILITY REQUIRED FOR THE SILVER ILS IS 1/2 MI; WHILE THE VISIBILITY REQUIRED FOR THE ILS/DME RWY 16R IS 1 1/2 MI AND THE VISIBILITY FOR RNO AT THE TIME WAS AT 3/4 MI. WITH THESE VISIBILITIES IN MIND; MY FO AND I BELIEVED THAT WE DID NOT HAVE THE VISIBILITY FOR ANY APCHS AT RNO GIVEN THE CURRENT CONDITIONS. THE SILVER ILS REQUIRES THE USE OF THE ENG INOP PROC. THIS PROC DOES HAVE A STIPULATION FOR NO LMM BEING OTS BUT NONE FOR FMG VOR. OVERALL WX CONDITIONS WERE CALM WINDS; 3/4 MI VISIBILITY; -SNOW; 003 BROKEN; 007 OVCST; AND 01/00 WITH BRAKING ACTION ADVISORIES IN EFFECT. DISPATCH REFERRED US TO FOM; NAV MISSED APCHS. THIS SECTION OF THE FOM ALLOWS US TO USE LNAV IF THE ADF IS REQUIRED BUT NOT INSTALLED ON THE ACFT AND REQUIRED FOR USE ON A 'PUBLISHED MISSED APCH.' WE BELIEVED THAT THESE GUIDELINES DID NOT ALLOW US TO BYPASS THE REQUIREMENT OF HAVING FMG VOR IN SVC. BASICALLY; DISPATCH WANTED US TO BUILD THE SINGLE ENG CLBOUT IN THE FMC. WE QUESTIONED THE LEGALITY OF THAT FOR THE FOLLOWING REASONS: 1) THE ENG OUT PROC IS TECHNICALLY NOT A MISSED APCH AND; THEREFORE; NOT LEGAL. 2) THE PROC AS LOADED IN THE FMC CAUSED A R TURNOUT TOWARDS NO LMM INSTEAD OF THE REQUIRED L TURN. 3) IN ORDER TO DIRECT A L TURN; AN ARTIFICIAL WAYPOINT MUST BE INSERTED. THE QUESTION BECOMES; WHERE DO YOU INSERT THAT WAYPOINT AND YET REMAIN W OF THE RMG 181 DEG RADIAL? 4) HOW DO YOU DEFINE THE FMG 181 DEG RADIAL WHILE IN THE TURN TOWARDS NO AND PROCEED DIRECT TO NO AT THE SAME TIME? WHILE IN DISCUSSION WITH DISPATCH; THE WX IMPROVED SUCH THAT WE COULD FLY THE ILS/DME RWY 16R. WHILE ENRTE; WE ATTEMPTED TO BUILD THE SINGLE ENG CLBOUT AND DISCOVERED THE PREVIOUS ANOMALIES. WE BELIEVE THE ANSWER TO THE FMG VOR BEING OTS CAN BE ANSWERED IN 2 WAYS: 1) CREATE AN LNAV ENG OUT PROC. 2) BEFORE BEING DISPATCHED TO RNO; ENSURE THAT YOU CAN FLY THE STRAIGHT-OUT SINGLE ENG PROFILE BASED ON WT AND PERFORMANCE UPON ARRIVING AT RNO.