After an engine failure in February, the Federal Aviation Administration issued three proposed directives for the Boeing 777-200 airplanes with Pratt & Whitney (PW) on Wednesday.
The directives require inspections and strengthen a key engine part and will allow Boeing's 777-200 airplanes with PW4000 engines to return to service.
In the crash, the United Airlines flight 777-200 crashed off the Denver train on Feb 20. The accident caused debris to come across over nearby cities. When the plane returned to the airport, nobody was injured.
The FAA said it wanted to strengthen the engine cowlings, to improve engine fan-blade inspection and to get other components in order to perform the right thing. The directives require correction after seeing results from inspection results.
The FAA in February ordered an immediate inspection of 777 aircraft with PW4000 engines before further flights after investigators found a cracked fan blade on the United engine was consistent with metal fatigue.
United and Boeing did not comment immediately.
That directive mandates that "guidance Pratt & Whitney provided to customers" on Wednesday. "It's already beginning to be as thorough as it is," he said.
The FAA said "further action is necessary to prevent flight failures and unsafe conditions."
United, the only US carrier with the PW4000 engine, has 52 planes still grounded.
United Chief Executive Scott Kirby noted that the airline's voluntary grounding of those 52 aircraft wasn't cheap.
It's a very expensive decision, but we did it for the safety of our own," Kirby told the US senator.
United said these 52 airplanes expected to return to service in the first quarter of 2022 in October.
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