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."
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Five men who died in the water off Camber Sands were friends who had arrived to spend the day at the beach together, ITV News understands.