<p>Boeing Co said on Thursday it had resumed flight testing of its 777X jets after an inspection in October found an engine issue.</p>.<p>GE said last month it was reviewing a technical issue that occurred during GE9X post-certification engineering testing of the plane, and had decided with Boeing to remove the engine and send it to a test facility in Ohio for engineering test runs.</p>.<p>The 777X, also known as the 777-9, is a larger version of the 777 wide-body jet and has been in development since 2013.</p>.<p>Boeing in April said it was halting production of the 777X through 2023 and confirmed a delay in handing over the first 777X jet to 2025 from the previous target of late 2023, but said it remained confident in the program.</p>.<p>The Federal Aviation Administration warned Boeing in a March 21 letter that existing certification schedules for the 737 MAX 10 and 777X were "outdated and no longer reflect the program activities."</p>.<p>Certification is needed before Boeing can begin deliveries.</p>.<p>In May 2021, the FAA told Boeing that, realistically, it would not certify the 777X until mid- to late 2023 and rejected a request by Boeing to clear a certification hurdle, citing numerous concerns about lack of data and lack of a preliminary safety assessment. The 777X had previously been expected to be released for use in June 2020.</p>.<p>Congress approved a sweeping certification reform bill in late 2020 after two fatal Boeing 737 MAX crashes that had added new requirements to getting aircraft approved.</p>.<p>Boeing Chief Executive Dave Calhoun said in April that it is "definitely a more rigorous process that we're all going through" to get airplanes certified.</p>
<p>Boeing Co said on Thursday it had resumed flight testing of its 777X jets after an inspection in October found an engine issue.</p>.<p>GE said last month it was reviewing a technical issue that occurred during GE9X post-certification engineering testing of the plane, and had decided with Boeing to remove the engine and send it to a test facility in Ohio for engineering test runs.</p>.<p>The 777X, also known as the 777-9, is a larger version of the 777 wide-body jet and has been in development since 2013.</p>.<p>Boeing in April said it was halting production of the 777X through 2023 and confirmed a delay in handing over the first 777X jet to 2025 from the previous target of late 2023, but said it remained confident in the program.</p>.<p>The Federal Aviation Administration warned Boeing in a March 21 letter that existing certification schedules for the 737 MAX 10 and 777X were "outdated and no longer reflect the program activities."</p>.<p>Certification is needed before Boeing can begin deliveries.</p>.<p>In May 2021, the FAA told Boeing that, realistically, it would not certify the 777X until mid- to late 2023 and rejected a request by Boeing to clear a certification hurdle, citing numerous concerns about lack of data and lack of a preliminary safety assessment. The 777X had previously been expected to be released for use in June 2020.</p>.<p>Congress approved a sweeping certification reform bill in late 2020 after two fatal Boeing 737 MAX crashes that had added new requirements to getting aircraft approved.</p>.<p>Boeing Chief Executive Dave Calhoun said in April that it is "definitely a more rigorous process that we're all going through" to get airplanes certified.</p>