Airbus Helicopters has released an update on its checks of the fuel sensors in the worldwide EC135 fleet.
On Feb. 20, Airbus Helicopters stated that it had received reports or a total of 1,506 sensors on 753 aircraft. This represents 70 percent of the global EC135 fleet, which encompasses 1,050 helicopters and 2,100 sensors.
In total, 99 fuel probes registered outside the tolerance level specified in an Alert Service Bulletin issued on Dec. 19. Of these, 62 showed deviations of less than three kilograms, which equals less than one minute of flight time. Although a cleaning and drying process restored the proper functioning of all fuel probes, five sensors did not recover the required specification and had to be replaced.
According to Airbus Helicopters, reliability analysis of the main tank fuel sensors conducted in parallel shows that there is no issue with the main tank probes, nor with the fuel transfer system and associated indications. Also, on all tested helicopters, the independent red "LOW FUEL" warning operated as expected on both supply tanks.
The Alert Service Bulletin was prompted by the discovery of supply-tank fuel gauging errors in EC135 helicopters flown by Bond Air Services and two other operators in Europe. According to the bulletin, tests have confirmed that the EC135’s fuel content probes generate erroneously high signals if contamination with water occurs.
For more updates from Airbus Helicopters and to read the relevant Alert Service Bulletins and Safety Information Notices on the Airbus Helicopters website click here.
On Feb. 20, Airbus Helicopters stated that it had received reports or a total of 1,506 sensors on 753 aircraft. This represents 70 percent of the global EC135 fleet, which encompasses 1,050 helicopters and 2,100 sensors.
In total, 99 fuel probes registered outside the tolerance level specified in an Alert Service Bulletin issued on Dec. 19. Of these, 62 showed deviations of less than three kilograms, which equals less than one minute of flight time. Although a cleaning and drying process restored the proper functioning of all fuel probes, five sensors did not recover the required specification and had to be replaced.
According to Airbus Helicopters, reliability analysis of the main tank fuel sensors conducted in parallel shows that there is no issue with the main tank probes, nor with the fuel transfer system and associated indications. Also, on all tested helicopters, the independent red "LOW FUEL" warning operated as expected on both supply tanks.
The Alert Service Bulletin was prompted by the discovery of supply-tank fuel gauging errors in EC135 helicopters flown by Bond Air Services and two other operators in Europe. According to the bulletin, tests have confirmed that the EC135’s fuel content probes generate erroneously high signals if contamination with water occurs.
For more updates from Airbus Helicopters and to read the relevant Alert Service Bulletins and Safety Information Notices on the Airbus Helicopters website click here.
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