What was found
RIGHT AFTER GEAR RETRACTION BOTH AFT LABS SMOKE ALARMS STARTED BEEPING. NO SMOKES, LIGHT HAZE AND BURNING SMELL-LIGHT TO MEDIUM. WE COULD SMELL IN THE COCKPIT. AFTER 2 MINUTES THE ALARMS STOPPED & SMELL ,HAZE DISSIPATED. AT LANDING AFTER STARTING APE SMELL CAME BACK. ACCOMPLISHED ODI-PREVENTION PROCEDURE 2172 SMOKE-FUME UNKNOWN. RADIO RACK FANS, RECIRC FAN, PACK COOLING FANSOPS CHK OK. L&R ENGINE BLEED DUCTS, PACK PNUE INLET & OUTLET, CROSSBREED DUCKS FOUND TO HAVE NO CONTAMINATION. PACK BURN-CLEAN, SOCK CHANGE ACCOMPLISHED PER 7100-2619; 2120-2367. OK FOR SERVICE. (LP4789130)