Air passengers flying into Cork Airport could face some disruptions over the coming days.
The warning comes after a faulty landing system was shut down by safety authorities.
The device, known as an Instrument Landing System, uses radio signals to guide planes landing in fog or low cloud.
Up to 17 flights into Cork Airport yesterday had to be diverted.
The Irish Aviation Authority said that it hopes to have the system fixed within the coming days.
"The Irish Aviation Authority (IAA) has advised airlines flying into Cork Airport that, in the event of bad weather, there may be delays or diversions in place as one of the electronic navigation aids, an ILS (Instrument Landing System), used to assist landing aircraft has been withdrawn from use due to periodic un-serviceability for reasons that have not yet been identified," said a statement on the Cork Airport website.
"The IAA will be using alternative landing systems currently in place, and the other runway where possible.
"The manufacturer of this equipment is working with the IAA to identify the reason for the un-serviceability. In the interest of safety, the equipment has been withdrawn from use until the issue has been resolved and the equipment is fully tested.
"This does not affect flights departing from Cork or landing on Cork Airport's other runways.
"The ILS is one of a number of sophisticated devices that assist aircraft to line up correctly with the runway when approaching to land.
"The ILS on Runway 17 is used by aircraft when southerly winds prevail. In the event of bad weather and southerly winds there is an increased likelihood that aircraft intending to land at Cork may have to divert to an alternative airport.
"Passengers and those expecting passengers to arrive at Cork Airport over the next few days should check with their airlines on the status of the flights."