FLC OF A DC9-41 CARGO DECLARED AN EMER AFTER BEING UNABLE TO KEEP THE CABIN ALT FROM RISING WHEN BOTH ENG PRESSURIZATION PACKS WERE ON. CAPT THEN TOOK ACFT CTL AND MADE AN EMER DSCNT TO 10000 FT AND DIVERTED TO LAND BEFORE THE CREW BECAME MORE UNCOMFORTABLE WITH THE COCKPIT COLD TEMP.

Narrative

ENRTE AT FL350 ON A FLT FROM EDMONTON; CANADA; TO ANC; AK; BOTH AIR CONDITIONING PACKS FAILED WITH THE TEMP SELECTORS IN 'AUTO.' PRIOR TO THIS; THE COCKPIT WAS EXCESSIVELY COLD; POTENTIALLY INTERFERING WITH OUR DUTIES. THE CAPT; WHO WAS THE PNF; CONSULTED THE APPROPRIATE ABNORMAL FOR THIS. HE THEN SELECTED 'MANUAL' AS 'AUTO' WOULD NOT KEEP US WARM ENOUGH. AS THE DUCT TEMP APCHED APPROX 80 DEGS C (180 DEG F) HE RESELECTED 'AUTO.' WITHIN APPROX 5 MINS THE PACKS FAILED INDICATING 0 PRESSURE. THE CABIN SLOWLY STARTED TO CLB AT THIS TIME. AS A PRECAUTIONARY MEASURE; THE CAPT ORDERED WE BOTH PUT ON OUR OXYGEN MASKS AND HE REQUESTED A LOWER ALT FROM ATC; AND ALSO ADVISING THEM OF OUR SIT. TERRAIN AND TFC BEING A CONSIDERATION; WE WERE ASSIGNED 10000 FT. AS WE STARTED TO DSND; THE CABIN BEGAN TO CLB RAPIDLY. THE CAPT TOOK OVER PF DUTIES AND COMMANDED THE RAPID DEPRESSURIZATION; EMER DSCNT; AND DSCNT CHKLISTS. ONCE AT 10000 FT; WE CONSIDERED OUR FUEL STATUS AND POS. THEN WE PERFORMED THE APPROPRIATE ABNORMAL FOR THE PROB WITHOUT SUCCESS. AT THIS TIME WE DECIDED TO DECLARE AN EMER AS A PRECAUTIONARY MEASURE. WE THEN DISCUSSED OPTIONS WITH ATC; DISPATCH; MAINT; AND THE CHIEF PLT'S OFFICE. UPON MUTUAL AGREEMENT; WE THEN PROCEEDED TO CORDOVA; AK (SMITH FIELD). UPON COMPLETING CONFIRMATION OF THE APPROPRIATE PERFORMANCE LNDG DATA AND WX; WE LANDED IN CORDOVA; AK; WITHOUT FURTHER INCIDENT.