A statement from Bond Air Services said: "During normal operations yesterday, one of our EC135 fleet has experienced an indication defect that requires further technical investigation.
"Therefore as a precautionary measure we have temporarily suspended service operations whilst we undertake detailed diagnosis.
"We commenced investigations overnight, are continuing this morning and are in close liaison with Eurocopter regarding this investigation."
More top news
James Wright has the latest weather forecast for the west of the ITV Meridian region
James Wright has the latest weather forecast for the east of the ITV Meridian region
Ukip leader fails to see the humour in a phone app created by teenagers which pokes fun at him and his party's views on immigrants.