CHARTING PROB ON LOC RWY 17 AT MHT. PLTS INDICATE THAT THERE IS CONFUSION OF POSSIBLE USE OF ONE VOR USED FOR THE INITIAL APCH FIX VERSUS THE VOR USED FOR DME THAT IS BEYOND THE ARPT.

Narrative

BETEY INTXN ON THE MHT LOC 17 APCH IS DEFINED BY THE RWY 17 LOC AND THE '11.4 DME' FROM AN UNDEFINED NAVAID (IT IS THE MHT VOR). THIS COULD BE CONFUSING TO PLTS; SINCE THE CON VOR IS AN IAF FOR THIS APCH; AND BETEY IS LOCATED APPROX AT THE 11.7 DME FROM CON. CONFUSION RESULTING FROM USE OF THE WRONG NAVAID TO DEFINE BETEY COULD CAUSE A LATE DSCNT IN AN IAP WITH A HIGHER THAN STANDARD DSCNT GRADIENT. RECOMMEND THAT THE MHT LOC 17 APCH PLATE BE MODIFIED TO REFLECT THAT THE MHT VOR IS THE SOURCE OF DME INFO USED TO IDENT BETEY INTXN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT HE WAS INFORMED ABOUT THIS APCH BY OTHER PLTS WHO HAVE BEEN CONVERSING ABOUT IT ON AN ONLINE SVC. HE SAYS IT IS ESPECIALLY A PROB IF ONE IS VECTORED ON A STRAIGHT-IN APCH AND IS TUNED TO CON VOR TO THE INITIAL APCH FIX. THEY MAY FAIL TO RETUNE TO THE MHT VOR AND MISINTERP THE DME FOR BETEY INTXN. THE PLT GROUP FEELS A DIRECT REF TO MHT ON THE CHART WOULD AVOID CONFUSION. RPTR HAS CONTACTED THE COMMERCIAL COMPANY WHO INDICATED THEY WOULD REVISE THE CHART. HE DOES NOT KNOW IF THIS IS HAPPENING AND CONTACTED US FOR ADDITIONAL ASSISTANCE.