A B727-200 IN CRUISE AT FL310 DECLARED AN EMER AND DIVERTED DUE TO LOSS OF CABIN PRESSURE AND LOWER BODY OVERHEAT WARNING. CAUSE UNKNOWN.

Narrative

AFT BODY OVERHEAT LIGHT CAME ON DURING CRUISE AT FL310. AFTER SHUTTING OFF THE L PACK AND THE #1 ENG BLEED AND THE L #2 ENG BLEED; THE LIGHT EXTINGUISHED. THE R PACK WOULD NOT HOLD PRESSURE AT FL310 AND DSCNT WAS MADE TO FL240. THE PACK STILL WOULD NOT MAINTAIN CABIN PRESSURE AND FURTHER DSCNT WAS MADE IN SEARCH OF AN ALT WHERE THE CABIN PRESSURE WOULD BE MAINTAINED. AT 13000 FT THE CABIN CLB WAS ARRESTED; AND AT 10000 FT; THE CABIN MAINTAINED PRESSURE. DUE TO THIS ABNORMALITY; IE; THE CABIN SHOULD MAINTAIN PRESSURE AT FL250 ON JUST 1 PACK; THE EMER WAS NOT CANCELED AS WE FELT CERTAIN THERE MUST BE AN ADDITIONAL BLEED AIR LEAK WITHIN THE SYS. WE MAINTAINED HIGH SPD; ABOVE 250 KTS; UNTIL 10 MI OUT OF MIA. FIRE TRUCKS WERE DISPATCHED TO LOOK OVER THE WHEEL WELL AREA AND AFT AIRSTAIRS AFTER AN UNEVENTFUL LNDG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT THE LOWER BODY OVERHEAT REQUIRED TURNING OFF THE L PACK; #1 ENG BLEED AND THE L #2 ENG BLEED WHICH PUT THE LOWER BODY OVERHEAT WARNING LIGHT OUT. THE RPTR SAID AN EMER WAS DECLARED. THE RPTR SAID THE R PACK WOULD NOT MAINTAIN CABIN PRESSURE AND A DSCNT WAS MADE TO 10000 FT WITH A DIVERSION TO MIA. THE RPTR STATED MAINT DID NOT ADVISE THE CORRECTIVE ACTION TAKEN. THE RPTR SAID THE CREW IMMEDIATELY WAS PUT ON ANOTHER ACFT TO CONTINUE THE TRIP.