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Boeing and FAA inform: defect on B-737 NG and MAX aircraft

The problem on the leading edge slat tracks concerns 312 units in the world

There seems to be no peace for the new family of 737 Boeing aircraft, already heavily hit by the grounding of the MAX variant after the two known accidents (Lion Air and Ethiopian Airlines) that caused the death of 346 people due to a malfunction of the automatic anti-stall system MCAS. The Seattle industry informed FAA (Federal Aviation Administration) that some parts (specifically the slats of the leading edge of the wing) of the B-737NG and MAX aircraft could have been improperly manufactured and could therefore not satisfy applicable regulatory requirements in terms of strength and durability. 

Following an investigation conducted by Boeing and the Certificate Management Office (CMO) of the US regulatory authority, the latter has determined that a certain number of parts produced by a third supplier of Boeing is faulty. The industry has identified through the serial numbers the units of the two models 737NG and 737MAX on which the defective parts could have been installed. And it announces that only in America are 32 Next Generation and 33 MAX aircraft at risk, while the world fleet involved is 133 NG and 179 MAX.

The parts in question may be subject to sudden failures or cracks deriving precisely from a defect in the manufacturing process. Although this failure does not result in the loss of the aircraft, the manufacturer points out, the risk remains that it could cause damage to the aircraft in flight.

FAA will therefore issue an airworthiness directive to impose on Boeing the necessary actions to remove and replace the parts. The operators of the affected aircraft are notified and the replacement must take place within 10 days. FAA also alerted international civil aviation authorities yesterday, asking that they also take immediate actions.

See for details by AVIONEWS.

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© AVIONEWS - World Aeronautical Press Agency Srl
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