A SECOND EC135 model helicopter showed issues with its fuel sensors just two weeks after the fatal Clutha crash, a court heard.
On December 11, 2013, an air ambulance landed at City Airport, Manchester with the pilot reporting contradictory fuel readings and low fuel warnings.
The Clutha Fatal Accident Inquiry (FAI) has previously heard that the Glasgow EC135 helicopter displayed five low fuel warnings before crashing down into the pub.
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Air Accident Investigation Branch (AAIB) engineers carried out enquiries into the incident, the inquiry heard, because of the connection to the Clutha helicopter, named G-SPAO.
Bond, the aircraft operator, grounded its fleet to carry out tests.
Of 22 EC135 helicopters in their EMS - air ambulance - fleet, 14 failed the test and one out of 16 EC135 helicopters which support police operations failed the test.
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Earlier the court heard that Airbus, the manufacturer of the twin-engine EC135 had nearly 700 fuel sensors returned in the six years prior to the Clutha crash, which claimed the lives of three helicopter crew and seven customers in the bar.
Between November 2007 and October 2013, 680 fuel sensors were returned due to reported "misreadings" on helicopter caution advisory displays (CAD).
From November 29, 2013 - the date of the crash - to May 2018, 600 sensors were also returned with reported problems.
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Holger Mendick, an aeronautical engineer and compliance verification engineer with Airbus, said the returns were a "huge" number but told the court it was "natural" that sensors would fail given the high number of flying hours by the company's helicopters.
The inquiry is seeking to discover the events surrounding the crash of 2013 and has been questioning experts about the effect of water contamination on fuel readings in the helicopter.
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