Three of the four turbo-prop engines failed on the Airbus A400m military transport that crashed near Seville, Spain, on May 9, killing four crew members and seriously injuring two other Airbus employees on the plane. That is the finding announced Wednesday morning by Spanish officials, and it matches with a prior finding by Airbus itself.

The United Kingdom, Germany, Turkey and Malaysia grounded their A400m transports following the crash. Germany is also reported to be considering seeking compensation of as much as €300 million for delays in shipments of the plane.

A report Tuesday in Defense News cited “unnamed aeronautical sector sources” who said that several protocols were ignored in final assembly of the crashed aircraft. The sources said that Airbus skipped the testing because it was in a hurry to make up for delays in the development and delivery of the plane. The computer system that controls the plane’s engines, called a FADEC, “should have been tested before, in a simulator, to check if everything worked.”

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In a statement released Wednesday morning, Airbus Defence and Space said:

[Spain’s military aircraft accident investigative commission] CITAAM confirmed that engines 1, 2 and 3 experienced power frozen after lift-off and did not respond to the crew’s attempts to control the power setting in the normal way, whilst engine 4 responded to throttle demands. When the power levers were set to “flight idle” in an attempt to reduce power, the power reduced but then remained at “flight idle” on the three affected engines for the remainder of the flight despite attempts by the crew to regain power. This statement is consistent with those three engines being affected by the issue addressed with our [Alert Operator Transmission] AOT.

The AOT was issued on May 19 and “requires” A400m operators to perform specific one-time check on the electronic control units for each engine before the aircraft’s next flight and introduced “detailed checks to be carried out in the event of any subsequent engine or [electronic control unit] replacement.”

Airbus’s military division continued its test flight program on the A400m with a one-hour, 50-minute flight from Toulouse to Seville on May 12. However Spain’s “military authorities” temporarily suspended the company’s license to perform flights with production aircraft that are being prepared for delivery. The crashed plane was scheduled for delivery to Turkey, which already owns two of the planes.

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The four-engine turboprop A400M can be fitted out as a refueling tanker, a cargo plane, a medical transport or a troop transport for up to 116 people or paratroopers. The planes are assembled at the Airbus plant in Seville. A total of 174 have been ordered and 12 have been delivered. Airbus has said that it continues previously planned final assembly of planes at the Seville plant.

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