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13 December 2013, 17:05
Heart's being told that normal services should resume on Sunday.
It's one of 22 helicopters across the country taken out of service - after a defect was found on a the same type that crashed in Glasgow.
Similare services in London and Surrey are on standby to help here.
It's hoped services will be back to normal this weekend.
Thames Valley and Chiltern Air Ambulance have released the following statement:
"As a precautionary measure, following an issue with the fuel indication system on one of their aircraft yesterday, Bond Air Services temporarily suspended service operations whilst they undertook further technical investigations of their fleet of EC135s, including the Thames Valley and Chiltern Air Ambulance.
"Bond Air Services have worked closely with the manufacturer, Eurocopter, to identify the immediate cause. They began a process of jointly testing the aircraft and are now sourcing and replacing the affected components.
"Bond Air Services have informed us that they are hopeful of being able to return the Thames Valley and Chiltern Air Ambulance aircraft to normal operational service on Sunday 15th December."