Airworthiness Directive · Amendment 39-19781 · Equipment/furnishings
The Boeing Company Airplanes
Superseded. A later AD replaced this one: AD 2025-01-08. Comply with the one in force.
This AD applies to all The Boeing Company Model 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747-8F, and 747-8 series airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 747-200B, 747-200C, 747-200F, 747-300, 747- 400, 747-400D, 747-400F, 747-8F, and 747-8 series airplanes. This AD was prompted by reports of uncommanded fore and aft movement of the Captain's and First Officer's seats. This AD requires, for the Captain's and First Officer's seats, repetitive horizontal actuator identifications, repetitive checks of the horizontal movement system (HMS), a detailed inspection of the HMS for certain airplanes, and applicable on-condition actions. This AD also requires an inspection to determine the part number and, if applicable, the serial number of the Captain's and First Officer's seats, and applicable on-condition actions. This AD also provides an optional terminating action for the repetitive actions for certain seats. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified in paragraph (i) of this AD: At the applicable times specified in paragraph 1.E., “Compliance,” of Boeing Special Attention Service Bulletin 747-25-3653, Revision 1, dated October 19, 2018, do all applicable actions identified as “RC” (required for compliance) in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-25-3653, Revision 1, dated October 19, 2018.
Within 36 months after the effective date of this AD, do an inspection of the nameplate on the Captain's and First Officer's seats for the part number, and serial number as applicable, and do all applicable on-condition actions, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-25-3644, Revision 1, dated July 17, 2018. A review of the airplane maintenance records may be used for the seat inspection if the part number and serial number can be conclusively determined from that review.
For purposes of determining compliance with the requirements of this AD: Where Boeing Special Attention Service Bulletin 747-25-3653, Revision 1, dated October 19, 2018, uses the phrase “the original issue date of this service bulletin,” this AD requires using “the effective date of this AD.”
Installation of a serviceable Captain's or First Officer's seat as specified in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-25-3653, Revision 1, dated October 19, 2018, terminates the repetitive actions required by paragraph (g) of this AD, for that seat only.
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
