Airworthiness Directive · Amendment 39-21993 · Instruments
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 747-8F and 747-8 series airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin 747-31A2565 RB, Revision 1, dated September 14, 2021.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-8F and 747-8 series airplanes. This AD was prompted by a report of unusual flight instrument and engine indication and crew alerting system (EICAS) behavior. This AD requires inspecting the left, center, and right electronic flight instrument system (EFIS)/EICAS interface unit (EIU) for certain serial numbers and replacement if necessary. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified by paragraph (h) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 747-31A2565 RB, Revision 1, dated September 14, 2021, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 747-31A2565 RB, Revision 1, dated September 14, 2021.
Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 747-31A2565, Revision 1, dated September 14, 2021, which is referred to in Boeing Alert Requirements Bulletin 747-31A2565 RB, Revision 1, dated September 14, 2021.
(1) Where Boeing Alert Requirements Bulletin 747-31A2565 RB, Revision 1, dated September 14, 2021, uses the phrase “the Original Issue date of Requirements Bulletin 747-31A2565 RB,” this AD requires using “the effective date of this AD.”
(2) Where Table 1 in Figure 1 of Boeing Alert Requirements Bulletin 747-31A2565 RB, Revision 1, dated September 14, 2021, lists affected EICAS interface unit (EIU) serial numbers, for this AD serial number 181MR2 is also an affected serial number.
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
