{"id":113571,"date":"2021-07-16T12:20:05","date_gmt":"2021-07-16T12:20:05","guid":{"rendered":"https:\/?p=113571"},"modified":"2021-07-16T12:20:11","modified_gmt":"2021-07-16T12:20:11","slug":"faa-orders-inspection-on-9300-boeing-737-planes","status":"publish","type":"post","link":"https:\/\/aviacionaldia.com\/en\/2021\/07\/faa-orders-inspection-on-9300-boeing-737-planes.html","title":{"rendered":"FAA orders inspection on 9,300 Boeing 737 planes."},"content":{"rendered":"\n

The Federal Aviation Administration (FAA) on Thursday issued a directive to operators of all Boeing 737 series airplanes to conduct inspections to address possible failures of cabin altitude pressure switches.<\/p>\n\n\n\n

See also: <\/em><\/strong>Boeing cuts 787 production as new structural problem discovered.<\/em><\/a><\/p>\n\n\n\n

The directive requires operators to conduct repetitive tests of the switches and replace them if needed. The directive covers 2,502 U.S.-registered airplanes and 9,315 airplanes worldwide, Reuters <\/a>reported.<\/p>\n\n\n\n

It was prompted after an operator reported in September that both pressure switches failed the on-wing functional test on three different 737 models.<\/p>\n\n\n\n

The FAA said failure of the switches could result in the cabin altitude warning system not activating if the cabin altitude exceeds 10,000 feet (3,050 m), at which point oxygen levels could become dangerously low.<\/p>\n\n\n\n

See also:<\/strong> Air France-KLM in talks with Boeing and Airbus for mega order aircraft.<\/a><\/em><\/p>\n\n\n\n

Airplane cabins are pressurized to the equivalent of not more than 8,000 feet (2438 m).<\/p>\n\n\n\n

Boeing said it supports \u201cthe FAA\u2019s direction, which makes mandatory the inspection interval that we issued to the fleet in June.\u201d The FAA directive did not report any in-flight failures of the switches.<\/p>\n\n\n\n

The FAA said on Thursday that tests must be conducted within 2,000 flight hours since the last test of the cabin altitude pressure switches, before airplanes have flown 2,000 hours, or within 90 days of the directive\u2019s effective date.<\/p>\n\n\n\n

Boeing initially reviewed the issue, including the expected failure rate of the switches, and found it did not pose a safety issue.<\/p>\n\n\n\n

Subsequent investigation and analysis led the FAA and Boeing to determine in May that \u201cthe failure rate of both switches is much higher than initially estimated, and therefore does pose a safety issue.\u201d Boeing declined to say what the failure rate was.<\/p>\n\n\n\n

The FAA added it \u201cdoes not yet have sufficient information to determine what has caused this unexpectedly high failure rate.\u201d<\/p>\n\n\n\n

The directive covers all versions of the 737 jetliners, including the MAX, but is unrelated to any issues related to the MAX\u2019s return to service last November.<\/p>\n\n\n\n

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