Boeing has recommended that airlines suspend the use of the 777 aircraft with the same kind of engine that disintegrated over over Denver (USA) over the weekend, after US regulators announced additional inspections and Japan suspended its use while considering new measures.
The cessation of the use of engines Pratt & Whitney PW4000 arrive after a 777 of United Airlines he will make an emergency landing Saturday in Denver after his right engine failed. United announced Sunday that it will voluntarily and temporarily retire its 24 active aircraft, hours before Boeing’s announcement.
Boeing has specified that 69 of these aircraft are in service and 59 in storage, at a time when airlines are keeping their aircraft on the ground due to a drop in demand associated with the pandemic of coronavirus.
The manufacturer has recommended that airlines suspend operations until US regulators identify the appropriate inspection protocol.
The 777-200 Y 777-300 Affected are older and less fuel efficient than the newer models and have been phased out by most operators from their fleets.
Pictures released by the police in Broomfield, Colorado, show important aircraft debris in the town, including the engine cover of the 26-year-old plane scattered in the garden of a house.
The National Transportation Safety Board (NTSB) claims his initial examination of the plane has indicated that most of the damage was limited to the right engine, and that the damage to the plane was minor.
The intake and housing were separated from the motor, and two fan blades were broken, while the rest of the fan blades showed damage.
Japan prohibits its use
The Ministry of Transport of Japan, for its part, has ordered the airlines Japan Airlines Y ANA Holdings discontinue use of 777 with PW4000 engines while you consider whether to take further action.
The Ministry has argued that on December 4, 2020, a JAL flight from Naha Airport to Tokyo returned to Naha due to a left engine malfunction.
The Japanese Transportation Safety Board reported on December 28 that it had found damage to two of the left engine fan blades. The investigation continues.
United is the only US operator that uses this type of aircraft, according to Federal Aviation Administration (FAA). The other airlines that use them are in Japón Y South Korea.
“We are reviewing all available safety data,” the FAA said in a statement. “Based on the initial information, we have concluded that the inspection interval for the hollow fan blades, unique to this engine model that is used only in Boeing 777 aircraft, should be increased.”
An official from the Ministry of Transport of South Korea it has stated that they were awaiting formal action from the FAA before giving a directive to their airlines. The US agency will issue an emergency airworthiness directive. Korean Air Lines It has 16 aircraft of this model, 10 of them in storage.
In February 2018, a 777 of the same age operated by United and bound for Honolulu suffered an engine failure when a deck fell about 30 minutes before the plane landed. The NTSB determined that the incident was the result of a fan blade fracturing its entire length.
Due to that 2018 incident, Pratt & Whitney reviewed inspection logs for all previously inspected PW4000 fan blades, the NTSB said. The FAA in March 2019 issued a directive requiring initial and periodic inspections of fan blades in the PW4000 engines.
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