A Japan Airlines passenger plane flew from Osaka to Kagoshima on Saturday with its engine thrust reverser locked, the company said Sunday.

The thrust reverser helps a plane to slow down after landing.

The Land, Infrastructure and Transport Ministry gave JAL a verbal warning for improper maintenance, because a mechanic forgot to remove the safety pin locking the engine thrust reverser during maintenance operations on Friday evening. The plane was carrying 181 passengers and crew members.

JAL had a similar maintenance problem in July, forcing a passenger plane to land with its engine thrust reverser nonfunctional.