WRAPUP 4-United finds multiple panels with problems on Boeing 737 MAX planes

* United finds problems with more doors during inspections * FAA grounded 171 737 MAX 9 jets after Alaska Airlines incident * Panel found in backyard of Portland school teacher * Boeing shares fall 8% By Valerie Insinna and David Shepardson WASHINGTON, Jan 8 (Reuters) - United Airlines has found loose bolts on multiple 737 MAX 9 aircraft, it said Monday, referring to the Boeing model that has been grounded after a panel blew off an Alaska Airlines-operated plane in mid-flight over the weekend.

* United finds problems with more doors during inspections

* FAA grounded 171 737 MAX 9 jets after Alaska Airlines incident

* Panel found in backyard of Portland school teacher

* Boeing shares fall 8%

By Valerie Insinna and David Shepardson WASHINGTON, Jan 8 (Reuters) -

United Airlines has found loose bolts on multiple 737 MAX 9 aircraft, it said Monday, referring to the Boeing model that has been grounded after a panel blew off an Alaska Airlines-operated plane in mid-flight over the weekend. Industry publication Air Current reported that United found discrepant bolts on other parts on at least five panels that were being inspected following the accident. The U.S. Federal Aviation Administration (FAA) and Boeing declined to comment. "Since we began preliminary inspections on Saturday, we have found instances that appear to relate to installation issues in the door plug – for example, bolts that needed additional tightening. These findings will be remedied by our Tech Ops team to safely return the aircraft to service," United said in a statement.

Boeing and U.S. regulators gave the go-ahead on Monday for airlines to inspect grounded jets. The inspections of 171 MAX planes mostly operated by U.S. carriers Alaska and United Airlines may take several days, forcing the cancellation of numerous flights.

Boeing shares sank 8% on Monday as the company reckons with the aftermath of the surprising panel emergency. It was the latest setback for Boeing following a series of production delays that have hampered its recovery from a lengthy 737 MAX safety grounding in 2019.

The FAA ordered the temporary grounding for checks of 171 MAX 9 jets installed with the 60-pound (27 kg) panel that detached from a full Alaska Airlines Flight on Friday and crashed into a Portland suburb without harm. (Additional reporting by Joanna Plucinska in London, Lisa Barrington in Seoul, Tim Hepher in Paris, Rajesh Kumar Singh in Chicago and Stanley Widianto in Jakarta; writing by Josephine Mason, Tim Hepher, and Rajesh Kumar Singh; editing by David Gaffen, Jason Neely, Barbara Lewis and Nick Zieminski)

(This story has not been edited by Devdiscourse staff and is auto-generated from a syndicated feed.)