Airworthiness Directive · Amendment 39-17639 · Fuselage
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 747-400 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 747-53A2844, Revision 1, dated July 30, 2012.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-400 series airplanes. This AD was prompted by reports of fasteners missing on an airplane undergoing a passenger- to-freighter conversion. This AD requires doing a general visual inspection of the station 1920 splice clip for correct fastener installation, and related investigative and corrective actions if necessary. We are issuing this AD to detect and correct missing or incorrect fasteners, which can lead to cracking and loss of load carrying capacity, resulting in a possible decompression event.
Except as required by paragraph (h)(1) of this AD, at the times specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 747-53A2844, Revision 1, dated July 30, 2012: Do a general visual inspection for correct installation of the station 1920 splice clip common to the auxiliary sill web and the tie clip, and do all applicable related investigative and corrective actions, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 747-53A2844, Revision 1, dated July 30, 2012, except as required by paragraph (h)(2) of this AD. Do all applicable related investigative and corrective actions before further flight.
(1) Where Boeing Alert Service Bulletin 747-53A2844, Revision 1, dated July 30, 2012, specifies a compliance time “after the original issue date of the service bulletin,” this AD requires compliance within the specified compliance time after the effective date of this AD.
(2) If any cracking is found during any inspection required by this AD, and Boeing Alert Service Bulletin 747-53A2844, Revision 1, dated July 30, 2012, specifies contacting Boeing for appropriate action: Before further flight, repair using a method approved in accordance with the procedures specified in paragraph (j) of this AD.
