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Investigators claim that the cargo plane's engine was accelerating before it crashed in Hong Kong.

Initial investigation has revealed that the Turkish cargo plane which skidded off of the runway in Hong Kong last month killing two airport employees experienced acceleration after landing in one of its four engine.

A preliminary report released by Hong Kong's Air Accident Investigation Authority late on Tuesday stated that the flight from Dubai operated by ACT Airlines for Emirates was normal up until shortly after landing.

Report: The Boeing 747 cargo aircraft was dispatched without the thrust reverser of engine 4, which is allowed under aviation regulations.

After landing, thrust reversers can help to slow down the aircraft by redirecting the engine thrust.

Investigators reported that after the plane's automatic braking system was disengaged, the captain took over control of the aircraft.

Soon after, the engine 4 on the right-hand side of the aircraft accelerated from 90% to 106% in 12 seconds.

After the plane had veered off the runway, thrust reversers were turned on in the three other engines. The plane struck a security vehicle and pushed it into the ocean, killing two airport workers.

The incident was the deadliest in the financial hub's airport in over 25 years.

The report stated that all four crew members survived, but the plane had been destroyed. The tail section was ripped apart by the impact.

Steven Dominique Cheung of the Hong Kong Professional Airline Pilots Association said that it is highly unusual for an aircraft to accelerate after landing.

He said that with the right-side engine running at full power, and the other engines working to slow down the plane, "there is no way you can maintain the control."

Boeing sent AAIA questions about the preliminary report.

Emirates and ACT Airlines didn't immediately respond to comments.

A full investigation is still needed to determine the cause of this crash. AAIA stated that it was gathering additional data, including technical issues relating to the aircraft systems, engineering problems, maintenance records, and flight crew qualification.

Hong Kong's Transport and Logistics Bureau announced on its Facebook page that it would release a report final within one year in accordance with international standards. (Reporting and editing by Jamie Freed; Farah master, Farah)

(source: Reuters)