Skymark under Scrutiny for Safety Procedures
The transport ministry is checking Skymark Airlines' safety procedures.
Ministry officials arrived at the airline's Tokyo headquarters on Monday morning.
Earlier this month Skymark flew a Boeing 767 in need of repair, nine months after a deadline set by Boeing.
Last week, the airline flew a plane that had been hit by lightning without repairing it.
Transport officials are checking whether the airline passed along instructions from aircraft manufacturers to mechanics and pilots.
They are also investigating whether the mechanics and pilots were properly informed of revisions made to aircraft manuals.
The transport ministry says part of the problem can be traced to staff turnover.
Experienced mechanics have been leaving the company recently, leaving the airline without sufficient staff.
The ministry also plans to investigate the level of management awareness.