Wires

UPDATE 1-U.S. orders speedy checks for cracks on 165 Boeing 737 NG planes

David Shepardson

(Adds more details, background)

WASHINGTON, Oct 2 (Reuters) - The U.S. Federal Aviation Administration said on Wednesday that aircraft operators must inspect 165 Boeing 737 NG airplanes for structural cracks within seven days after the issue was found on a small number of planes.

Boeing Co notified the FAA of the issue after it discovered structural cracks on an aircraft undergoing modifications in China. The FAA said subsequent inspections found similar cracks in a small number of additional planes. The FAA said planes with fewer flights will eventually get inspected.

The order covers a total of 1,911 U.S. registered planes. The inspections can be done visually and should require about an hour per airplane, the FAA said.

Southwest Airlines Co, United Airlines and American Airlines Inc are among carriers that fly the 737 NG. The NG includes the 737-600, -700,-700C,-800, -900, and -900ER.

American Airlines spokesman Ross Feinstein said none of the company's 737-800 fleet "fall into the seven day requirement." The company anticipates around 80 737-800 aircraft will require this inspection in the next eight months and the inspections will not impact its operation.

The FAA said the inspections would look for "cracking of the left and right hand side outboard chords of frame fittings and failsafe straps." The FAA said the issue "could adversely affect the structural integrity of the airplane and result in loss of control of the airplane."

The 737 NG is the third-generation 737 and version before the now grounded 737 MAX, which is not impacted by the issue. Boeing said on Friday it has been in contact with 737 NG operators about the discovery of cracks, but added that "no in-service issues have been reported."

Reuters and other outlets late on Friday reported the planned inspections, but the FAA had not discovered overall details. The order will take effect on Thursday.

Aircraft with more than 30,000 cycles must be inspected within seven days, while planes between 22,600 and 29,999 cycles must be inspected within 1,000 cycles, which typically correspond to the number of flights. The FAA wants operators to "report their findings to the agency immediately." (Reporting by David Shepardson; editing by David Evans and Sandra Maler)