Upon investigation, it was found that prior to flight. Technicians have already priced the check air conditioning air pressure switch and rotate in the air from a Manual to check Auto but forgot to turn.
On investigation it was found that Prior to flying machines Technician check the terms of the aircraft. Turn the switch and adjust the air pressure in the air from Auto to Manual, but forget to check back rotation.
When the investigation, it was found that the earlier flight fly. How to check the neatness of NGE plane. Rotary switch and adjust the air pressure in the air from the Auto is Manual to check, but forgot to turn around.