A CANADAIR CL65 IN CLB AT 15500 FT DIVERTED DUE TO R FOURTEENTH STAGE BLEED MANIFOLD AND WING ANTI-ICE DUCT OVERHEAT WARNING CAUSED BY A FAILED SENSING LOOP.

Narrative

CREW HAD A NORMAL BOARDING; PUSH; TKOF AND AREA DEP. DURING CLB FROM THE ORLANDO AREA; ICING CONDITIONS WERE ANTICIPATED; SO WING AND ENG COWL ANTI-ICE SYS WERE SELECTED ON AFTER TKOF. DURING CLIMB; ANTI-ICE SYS FUNCTIONED NORMALLY. ALTHOUGH NO ICE WAS DETECTED BY ICE DETECTION SYS; CREW WAS IMC WITH TOTAL AIR TEMP IN THE ICE RANGE. CLBING THROUGH 15500 FT; AN 'ANTI-ICE DUCT' AURAL MESSAGE AND TRIPLE CHIME RED MESSAGE WAS DISPLAYED ON THE EICAS. A REVIEW OF THE SYS SYN PAGE SHOWED THE DUCTING BETWEEN THE FOURTEENTH STAGE BLEED MANIFOLD AND WING WAS RED AND IN AN OVERHEAT CONDITION. CAPT CALLED FOR THE QRH PROC WHICH WAS ACCOMPLISHED BY THE FO; DIRECTING THE CREW TO TURN OFF THE ANTI-ICE SYS AND ISOLATE THE FOURTEENTH STAGE BLEED SYS. THIS WAS DONE. HOWEVER; CLBING THROUGH 17000 FT; THE ICE DETECTORS DISPLAYED AN 'ICE' AURAL MESSAGE AND A TRIP CHIME RED MESSAGE. WITH THE FO TALKING TO THE COMPANY ON #2 RADIO AND CAPT FLYING THE ACFT AND TALKING TO ATC; I REQUESTED A DSCNT TO A LOWER ALT TO CLR THE ICING CONDITIONS; ALSO AS DIRECTED BY QRH PROC. BEING SO EARLY INTO FLT AND OPERATING IN IMC; CREW DECIDED A RETURN FOR LNDG IN ORLANDO WAS WARRANTED. CAPT REQUESTED AND RECEIVED CLRNC FROM ZJX A RETURN TO MCO FOR PRECAUTIONARY LNDG. CREW THEN COMPLETED ARR CHECKLISTS. HOWEVER WITH THE POSSIBILITY OF MORE ICE ON ARR; CREW ELECTED TO USE THE 'LNDG WITH RESIDUAL ICE' PROC. WITH A SUBSTANTIAL INCREASE IN APCH AND LNDG SPD; CAPT REQUESTED CFR TO STAND BY FOR OUR ARR. CREW COMPLETED THE REST OF THE ABNORMAL AND NORMAL CHECKLISTS FOR ARR. THE APCH AND LNDG WERE MADE BY THE CAPT WITHOUT INCIDENT. CREW REQUESTED AN INSPECTION OF ACFT LNDG GEAR TO ENSURE NO TIRES HAD BLOWN ON ARR. A GOOD RPT WAS RECEIVED FROM CFR; SO CREW TAXIED ACFT TO MCO GATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A CANADAIR CL65. THE RPTR SAID MAINT DISCOVERED THE R WING FOURTEENTH STAGE BLEED MANIFOLD AND WING ANTI-ICE DUCTING ALL IN GOOD CONDITION. THE RPTR SAID MAINT FOUND THE OVERHEAT WARNING SENSING LOOP BROKEN AND SHORTED TO GND CAUSING THE FALSE WARNING.