Divers are now expected to wait until Sunday to carry out a search for the wreckage of Rescue 116 and its three missing crew members.
Pilot Mark Duffy, and winch men Ciaran Smith and Paul Ormsby, have still not been located after their helicopter Rescue 116 lost communication shortly before 1am on Tuesday morning.
Meanwhile funeral details have been announced for Captain Dara Fitzpatrick (45), who was recovered from the sea but later pronounced dead.
Capt Fitzpatrick will be laid to rest on Saturday. The mass will take place at 11am in St Patrick’s Church, Glencullen followed by a cremation at Mount Jerome, Harold’s Cross.
The Granuaile vessel is expected to arrive at Black Rock early on Friday morning to carry out and underwater sonar-scan once the weather conditions improve.
Tonight it has emerged that some debris from the helicopter has been found near the lighthouse.
Derek Geoghegan, of the Irish Coast Guard, said that a window of good weather was paramount for sonar scanning and a dive to be carried out.
“So we’re going to clear [the debris] first. With the weather window we’ve established we’re going to go straight in with an ROV or a naval dive team once we’ve established where the black box is; that the wreckage is there and hopefully that our colleagues are with that wreckage.
“We identified that window of three to four hours on Sunday. We have to scan the area for clearance... to work there.
“The preparatory work we’ll have to do a lot of that this evening and tomorrow," he said.