New 737 Max issue affects nearly two dozen
airlines, 106 jets: FAA
By Jon Hemmerdinger23 April 2021
The US Federal
Aviation Administration has disclosed new details about an electric problem
that forced the grounding of more than 100 recently-produced Boeing 737 Max.
Though the issue
primarily affects jets delivered by Boeing after the FAA lifted the grounding
in November 2020, several Max delivered before the grounding are also affected,
according to the agency.
Regulators
globally grounded the Max in mid-March 2019.
Source: Shutterstock
A WestJet 737 Max
The issue involves
“potential degradation of bonds associated with electrical grounding of
equipment that could affect the operation of certain systems”, says the FAA in
a 22 April “Continued Airworthiness Notification to the International
Community”.
Potentially
affected Max systems include standby power control units, “P6” circuit breaker
panels and main instrument panels, it adds.
Boeing notified
the FAA about the concern, which it discovered “after electrical power systems
did not perform as expected during the testing of a newly manufactured Model
737-8 airplane,” says the FAA’s notice.
Chicago-based
Boeing publicly disclosed the problem on 9 April but did not specify how many
aircraft were affected. Boeing recommended airlines pull affected jets from
service.
The FAA’s 22 April
memo specifies that the problem affects 106 737 Max 8s and Max 9s, including 71
in the fleets of US airlines.
Those jets have
manufacturing line numbers between 7,399 and 8,082. Boeing manufactured them
after making design changes in “early 2019”, the FAA says.
Of the 106
aircraft, Boeing delivered 18 in early 2019 prior to the global grounding,
according to Cirium fleets data.
Operators with
affected jets include four large US carriers: Alaska Airlines, American
Airlines, Southwest Airlines and United Airlines.
Others are Air
Canada, Belavia, Blue Air, Cayman Airways, Copa Airlines, GOL, Icelandair,
Minsheng Leasing, Neos, Shandong Airlines, SilkAir, SpiceJet, Sunwing Airlines,
TUI, Turkish Airlines, Valla Jets, WestJet and Xiamen Airlines, says the FAA.
“This issue is not related to
recertification of the flight control system on the 737 Max, un-grounding of
the aircraft, or its return to service,” the FAA’s notice says. “All affected
in-service airplanes passed all testing prior to delivery and there have been no
reported in-service failures due to this condition.”
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