Nippon Cargo Airlines has suspended all operations while it investigates maintenance records for one of its aircraft that has been described as “inappropriate”.

The Japanese airline says it found one inappropriate record concerning the lubricating oil supply to the aircraft parts at Tokyo’s Narita Airport on 3 April 2018.

As a precautionary measure it has temporarily grounded all aircraft until all maintenance records have been “confirmed appropriate”, with flights from Narita ceasing on 16 June.

It says details are under investigation and it expects to take at least a week to confirm aircraft safety.

In a statement, the airline says: “We sincerely apologise for the inconvenience and worries we caused our customers. We will do our utmost effort to check safety for resuming operation as quickly as possible.”