HELICOPTER manufacturer Eurocopter has issued a worldwide safety alert after a fault was found in the model of craft that crashed into a Glasgow pub, killing 10 people.
The company said there was a problem with the fuel indication system on some of its EC135 aircraft, the same type as the police helicopter involved in the Clutha bar tragedy in Glasgow last month.
Operator Bond Air Services temporarily suspended flights of its 22 EC135 helicopters last week after a fuel gauge fault was discovered on an air ambulance in the North West of England.
The suspension affected air ambulance and police helicopters across the UK, many of which have now resumed flights.
Eurocopter has now issued a safety information notice after tests revealed other aircraft may be affected by similar issues.
A statement said: "Eurocopter has been informed by Bond Air Services of an issue involving the fuel indication system experienced during normal operations by one of its EC135 EMS aircraft.
"Following this incident, fuel system functionality tests performed by Bond Air Services and two other EC135 operators in Europe have revealed possible similar supply-tank fuel gauging errors on some aircraft.
"This incident is currently under in-depth investigation by Eurocopter. The first analysis shows that the indication of the fuel quantity in the supply tanks could be over-estimated."
The safety notice warns crews that in the "worst case" scenario, a red low fuel warning could appear without any amber fuel caution beforehand.
In a statement, Bond said: "We note that Eurocopter has today issued a safety information notice to operators of the EC135 across the world confirming that some of their aircraft have a fault in the fuel indication and alert system which means that warning system may not work properly.
"This was a fault discovered by Bond during normal service operations on Wednesday 11th, which we immediately reported to Eurocopter and the appropriate authorities.
"We understand other operators have since conducted similar tests and found similar problems with their aircraft.
"As soon as we discovered this issue, in line with our commitment to the highest standards of safety, we took the prudent decision to temporarily suspend service operations whilst we conducted checks on our fleet of EC135s.
"The results of these tests were subsequently validated by Eurocopter, and appropriate repairs made before returning the aircraft to service."
The company said it had ordered that all its EC135s should have a minimum of 90kg of fuel on board at all times.
An initial report from the Air Accidents Investigation Branch (AAIB) into the Glasgow crash said there was "no evidence of major mechanical disruption of either engine" of the Police Scotland helicopter.
In addition, the helicopter still had 95 litres of the 400kg of fuel that it had taken off with from Glasgow City Heliport.
The three people on board the Bond-operated aircraft and seven people in the pub died when it crashed on November 29.
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