Nippon Cargo Airlines (NCA) says that its current suspension of flight operations could last for several more days.
The entire grounding of flights started on June 17 after discrepancies in the maintenance logs for one of its eight B747-8F aircraft were uncovered during a routine inspection.
The Japanese cargo specialist said in a statement that an inspection on June 14 showed a mismatch between the amount of lubricating oil present onboard flight JA14KZ and that recorded in the aircraft's maintenance logs. The event was immediately reported to the Japanese Ministry of Land, Infrastructure, Transport and Tourism (MLITT).
"In the interests of caution and to ensure the safety of our operations, we have decided to temporarily ground all aircraft until all maintenance records have been confirmed as appropriate," it said.
NCA has been under intense scrutiny from the MLITT after failing to report several seemingly minor incidents involving its aircraft over the past year or so.