COASTGUARD air assets were deployed from Dublin and Scotland to assist in the major firefighting efforts on the Mourne Mountains over the weekend.
The services were among numerous agencies tasked to Co Down to help tackle the major gorse fire.
More than 100 firefighters and 12 fire appliances from across Northern Ireland fought the blaze, which broke out on Friday.
On Saturday, Sinn Féin MP Chris Hazzard had posted on social media that the Irish Air Corps would be involved in the emergency operation.
It was previously involved in emergency operations in the north.
However, a Northern Ireland Fire and Rescue Service (NIFRS) spokesperson said the Irish Air Corps was "not available to attend".
In July 2018, it had assisted firefighters as they tackled a wildfire near Tollymore Forest Park. The aircrew were captured scooping seawater just off Newcastle Harbour.
A NIFRS spokesperson said: "We requested support from the coastguard for aerial reconnaissance and to transport firefighters into inaccessible areas of the mountain," she said.
"Coastguard air assets were deployed from both Dublin and Prestwick to support operations. The Irish Air Corps were not available to attend the incident."
Stormont Agriculture Minister Edwin Poots who visited the area on Saturday also spoke of how an Irish helicopter would be operational and would later be relieved by one from England.