OPERATOR WAS TRYING TO PUT AIR CONDITIONER DIRECTIONAL COVER BACK IN PLACE AT THE SAME TIME AS HE WAS OPERATING THE LOADER. THE COVER SLIPPED & HIS LEFT HAND ENTERED THE OPENING. HIS LEFT RING FINGER CAME IN CONTACT WITH THE SQUIRREL CAGE FAN, LACERATING THE FINGERPRINT PORTION OF THE FINGER & ALSO RESULTING IN AN OPEN DISTAL TUFT FRACTURE ON THE END OF THE FINGER.