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Ieuan Wyn Jones, Plaid Cymru Assembly Member for Ynys Môn says that selling off the search and rescue service to a private contractor is "a step into the unknown."
Speaking following the announcement which will see the service move from Anglesey to Caernarfon.
After winning the contract to take over search and rescue helicopter cover from the RAF, Bristow Helicopters have released details of the new fleet that will be deployed in April 2015.
There will be two helicopters at both its Welsh bases -Caernarfon Airport and the MOD site at St Athan near Barry.
Caernarfon's Sikorsky helicopters will cover an area of 250 nautical miles around the base and each carry three stretchers and up to 10 seated casualties. Augusta Westlands will cover 200 nautical miles around St Athan and each have room for two stretchers and six seated casualties.
All the helicopters will have a crew of four and be capable of flying at 145 nautical miles an hour.
The government is set to announce that Britain's Search and Rescue service is to be sold off to an American firm.
Up until now, the operation has been run by the RAF, Navy and Coastguard Agency.
The firm will actually be awarded two contracts, because the service has been separated into two parts operating different types of helicopter.
An announcement is expected just before the stock market opens in the morning.
The Department for Transport has signed a contract with Bristow Helicopters Ltd to provide search and rescue helicopter services in the UK.
The deal will see two helicopters based at Caernarfon Airport, and a new base will be set up at St Athan in the Vale of Glamorgan.
According to the Department for Transport, under the new Search and Rescue contract, 22 'state of the art' helicopters will operate from 10 locations around the UK.
- 2 Sikorsky S92s helicopters will operate from a base in Caernarfon
- 2 AgustaWestland AW189s will operate from a new base at St Athan
Among the 12 bases from where search and rescue operations are launched is RAF Valley on Anglesey, where the Duke of Cambridge is based.
Under the contracts due to be unveiled tomorrow, the total number of bases is expected to be cut from 12 to10 although it is not clear which bases will be closed.
Assurances have already been given that the Duke will be moved to another part of the military rather than being employed by the firm that is awarded the search and rescue contracts.