Airworthiness Directive · Amendment 39-21521 · Electrical power system
The Boeing Company Airplanes
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.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-8 and 737-9 airplanes. This AD was prompted by manufacturing design changes to certain metallic support panel assemblies installed in the flight deck, which resulted in insufficient electrical bonding of the panels and consequent insufficient electrical grounding of installed equipment. This AD requires modification of the electrical bonding of these assemblies to provide sufficient electrical grounding for equipment installed in the flight deck. The FAA is issuing this AD to address the unsafe condition on these products.
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.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
