A SAAB 340B IN CRUISE AT FL200 SHUT DOWN #2 ENG AND DIVERTED DUE TO #2 ENG BLEED OVERHEAT WARNING LIGHT CAUSED BY A FAULTY ENG SENSOR.

Narrative

WHILE CRUISING AT FL200 AND 40 MI NE OF BYP VOR; WE HAD A MASTER CAUTION LIGHT AND CHIME GO OFF. WE IDENTED THE PROB AS BEING THE R BLEED CLOSED LIGHT AND R BLEED FAULT LIGHT. AFTER RUNNING THE APPROPRIATE EMER CHKLIST PER THE SAAB 340 AOM; VOLUME 1; WE DETERMINED THAT THE PROB WAS NOT CORRECTABLE. WE THEN DSNDED BELOW 14000 FT FOR PRECAUTION ON PRESSURIZATION. AFTER CONFERRING WITH ACR DISPATCH AND MAINT; WE DECIDED TO SHUT DOWN THE R ENG; AS PER THE CHKLIST SUGGESTION. WE DECLARED AN EMER WITH ATC AND WERE GIVEN PRIORITY INTO DFW ARPT. DURING THE AFTER LNDG CHKLIST; THE R BLEED LIGHT EXTINGUISHED ITSELF; BUT ONLY FOR AROUND 1 MIN BEFORE IT CAME BACK ON. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE RED BLEED OVERHEAT LIGHT AND THE MASTER CAUTION WARNING LIGHT CAME ON FOR THE R ENG INDICATING A PNEUMATIC BLEED OVERHEAT. THE RPTR SAID AFTER CONTACTING DISPATCH AND MAINT IT WAS DECIDED TO SHUT DOWN THE R ENG PER THE OPERATING MANUAL PROCS. THE RPTR STATED THAT MAINT RAN THE ENG BUT COULD NOT DUPLICATE THE PROB AND REPLACED THE #2 ENG PNEUMATIC BLEED TEMP SENSOR. CALLBACK CONVERSATION WITH RPTR ACN 457977 REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A SAAB 340B AND THE CAUSE OF THE R ENG PNEUMATIC BLEED OVERHEAT WAS UNKNOWN.