Airworthiness Directive · Amendment 39-21623 · Powerplant
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model 737 airplanes powered by LEAP-1B engines, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 737 airplanes powered by LEAP-1B engines. This AD was prompted by reports of inadvertent release of the spring energy of the spring door opening system (SDOS) actuator with a certain part number, causing injury and the potential for injury to maintenance personnel. This AD requires replacing each affected SDOS actuator with a new SDOS actuator, and verifying that new safety markers are installed in the proper locations. The FAA is issuing this AD to address the unsafe condition on these products.
For airplanes identified in Boeing Special Attention Requirements Bulletin 737-71-1911 RB, Revision 1, dated September 10, 2020: At the applicable times specified in the “Compliance” paragraph of Boeing Special Attention Requirements Bulletin 737-71-1911 RB, Revision 1, dated September 10, 2020, except as specified by paragraph (h) of this AD, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention Requirements Bulletin 737-71-1911 RB, Revision 1, dated September 10, 2020.
Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Special Attention Service Bulletin 737-71-1911, Revision 1, dated September 10, 2020, which is referred to in Boeing Special Attention Requirements Bulletin 737-71-1911 RB, Revision 1, dated September 10, 2020.
Where Boeing Special Attention Requirements Bulletin 737-71-1911 RB, Revision 1, dated September 10, 2020, uses the phrase “the original issue date of Requirements Bulletin 737-71-1911 RB,” this AD requires using “the effective date of this AD.”
