The European Aviation Safety Agency (EASA) is proposing mandatory inspections of Airbus A380 passenger emergency oxygen pressure systems following reports that leaks have been discovered during maintenance checks.

In a draft directive issued Monday, EASA says that investigations have confirmed that cracked manifolds are to blame. The directive would require inspections of the systems before 5,000 flight hours or within 1,000 hours of the directive’s effective date, whichever comes later, and then every 5,000 flight hours thereafter.

Items to be checked include the oxygen distribution pressure line and container manifolds.