A few weeks ago the Yomiuri News on-line reported the following:
On the 30th (May) by a news coverage on the Ministry of Land, Infrastructure, Transport and Tourism, it turned out that Japan Airlines had made maintenance mistakes in total on 16 occasions from October last year to May this year.
Although no operational trouble incidents had occurred, as "the frequency of mistakes occurred was exceptional", the Ministry of Land, Infrastructure and Transport instructed Japan Airlines to know the cause and to prevent future recurrence.
According to Ministry of Land, Infrastructure and Transport and also the Japan Airlines, when the engine of a Boeing 777 was fixed in March, the company forgot to attach back the parts of a retrorocket device which was used for slowing down at the time of landing, and the flying was continued for about one month. It was said that in the worst case scenario, there was a possibility that some parts of the engine might have been damaged.
Moreover, the company forgot to attach back some parts of the main leg of the Boeing 767, and a possibility was that this might affect the braking. Also there was a case which a final maintenance confirmation was carried out by an unqualified mechanic.
This report could be a PR disaster for JAL.