What was found
WHITE SMOKE FILLED COCKPIT DURING CLIMB, WENT AWAY AND CLEARED ABOUT 5 MINUTES LATER ON FINAL, THE SMOKE REAPPEARED & CLEARED AGAIN AND ONE LAST TIME DURING TAXI IN, ON ARRIVAL TO GATE LT AUTO PACK FAIL CAUTION MESSAGE. APPEARED FLIGHT 4941. R & R LT AIR CYCLE MACHINE IAW AMM 21-51-08, PERFORMED LEAK CHECK OF THE AIR DISTRIBUTION SYSTEM IAW AMM 21-51-00, NO LEAKS FOUND. PERFORMED AN OPS CHK OF AIR CONDITIONING SYS IAW AMM 21-51-00, OPS CHKD GOOD, NO LT PACK CAUTION OR ANY CORRELATING FAILURE MESSAGES FOUND. WENT INTO THE MDC AND PERFORMED THE ACSC 1 SELFTEST IAW AMM 45-45-00. TEST PASSED.