North Devon will be saying goodbye to its big yellow bird as Chivenors 22 Squadron hands over its search and rescue (SAR)duties tomorrow (Thursday).At 1pm, Bristow Ltd will be taking over SAR duties on behalf of HM Coastguard, operating from a brand new base in St Athan, South Wales. A spokesman for RMB Chivenor confirmed the Sea King will be making one last operational flight over North Devon. The Gazette understands from a source close to the base that the helicopter will take off from RMB Chivenor tomorrow at 11am and land again at 12.45pm. But Chivenor has remained tight-lipped over any final flight times, and would not confirm these details. It may, however, not be the last time the Sea King is seen in the skies above North Devon. Although no longer operational in search and rescue, the helicopter will be used in training and may be seen flying on week days during working hours. The Sea King is being replaced by two brand-new Augusta Westland AW189 helicopters. But a spokeswoman for Bristow said there had been delays in the introduction of the new helicopters. She said: The contract with the Maritime and Coastguard Agency is for Bristow to operate 22 aircraft for the duration of the UK SAR H contract 11 AW189s and 11 S92s. However, delays the company has experienced with the introduction of the AW189 has resulted in the need for a contingency plan that involves the temporary use of alternative aircraft at AW189 bases. The St Athan base will operate two Agusta Westland AW139s. The AW139, on which the AW189 is based, delivers the requirements of UK SAR. It has been successfully operating on behalf of HM Coastguard on the south coast of England for a number of years. It is not known how long the temporary AW139s will be in use.