What was found
SMOKE FILLED CABIN ON SHORT FINAL. AFTER LANDING, SMOKE WENT AWAY AND R PACK AUTOFAIL MESSAGE APPEARED. / REMOVED AND REPLACED THE RH AIR CYCLE MACHINE IAW CRJ 900 AMM 21-51-08-000/400-801. PERFORMED OPERATIONAL TEST OF OF AIR CONDITIONING DISTRIBUTION SYSTEM IAW CRJ 900 AMM 21-51-00-710-801-A01. OPS CHECKED GOOD AT THIS TIME. PERFORMED LEAK CHECK RH OF AIR CONDITIONING DISTRIBUTION SYSTEM IAW CRJ 900 AMM 21-51-00-790-801-A01. LEAK CHECKED GOOD AT THIS TIME