Airworthiness directives › 2021-09-08
AD 2021-09-08 Airworthiness Directives; The Boeing Company Airplanes
Models named: 737-8, 737-9. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 737-8 and 737-9 airplanes, certificated in any category, line numbers 7399 through 8082 inclusive, with an original airworthiness certificate or original export certificate of airworthiness issued on or before April 9, 2021.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Before further flight, modify the electrical bonding of the support panel assemblies installed in the flight deck to provide sufficient electrical grounding for equipment installed in the flight deck, as specified in paragraphs (g)(1) and (2) of this AD, as applicable, in accordance with a method approved by the Manager, Seattle ACO Branch, FAA. (1) Modify the electrical bonding of the P6 panel assembly, including the mounting tray for the standby power control unit (SPCU), located behind the first officer. (2) Modify the electrical bonding of the main instrument panel (MIP) assembly located in front of and between the captain and first officer.
Unsafe condition
This AD was prompted by manufacturing design changes to certain metallic support panel assemblies installed in the flight deck. The design changes resulted in insufficient bonding of the panel assemblies and consequent insufficient electrical grounding of installed equipment. Degradation of bonds essential for the electrical grounding of equipment could affect the operation of certain systems, including engine ice protection. The FAA is issuing this AD to prevent loss of critical functions and/or multiple simultaneous flight deck effects, which may prevent continued safe flight and landing.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1