What was found
ON CLIMBOUT PASSING 17,000 FT RECEIVED AVIONICS SMOKE WARNING ALERT, JUST PRIOR SMELLED A MUSKY BURNING ODOR. THE ODOR SEEMED TO INCREASE AND DECREASE IN INTENSITY. THEN RECEIVED AVIONICS SMOKE ALERT. DECLARED EMERGENCY, RETURNED TO MEM. UNABLE TO COMPLY. REMOVED AND REPLACED COALESCER BAGS. REF A310 AMM CH 21-51-16-4. TOOK A/C TO HIGH POWER. PERFORMED AIR COOLING SYSTEM SERVICING (DUCT BURNOUT). REF A310 AMM CH 21-51-00-3. NO AVIONICS SMOKE LITE OR ANY ABNORMAL ODORS NOTED. REMOVED AND REPLACED COALESCER BAGS AFTER HIGH POWER. FOUND OLD BAGS VERY DIRTY AND WET.