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Sun, Sep 08, 2013

AD: The Boeing Company Airplanes

AD NUMBER: 2013-16-24

PRODUCT: Certain Boeing Model 747 series airplanes.
SUBJECT: Airworthiness Directive 2013-16-24
ACTION: Final Rule

SUMMARY:  The FAA is superseding airworthiness directive (AD) 90-23-14 for the product listed above. AD 90-23-14 required inspections of the fuselage skin lap splice between body station (BS) 340 and BS 400 at stringers (S)-6L and S-6R, and repair if necessary.

This new AD adds new repetitive inspections for cracking in the S-6 skin lap splice, which terminates the inspections required by AD 90-23-14; eventual modification of the lap splice, which terminates the repetitive inspections; post-modification inspections; and corrective actions if necessary. This AD also adds airplanes to the applicability.

This AD was prompted by a report of cracks up to 18.5 inches that were found at S-6L and S-6R on several airplanes, and subsequent analysis results that indicated that the protruding head fastener modification and related postmodification inspections required by AD 90-23-14 are not adequate to prevent cracking at the upper row of fasteners in the S-6 lap joint before the cracks reach a critical length.

The FAA is issuing this AD to detect and correct cracking at the upper row of fasteners in the S-6 lap joint, which could result in a sudden loss of cabin pressurization and the inability of the fuselage to withstand failsafe loads.

DATES: This AD is effective October 9, 2013. 

FMI: AD

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