Airworthiness directives › 2016-04-03
AD 2016-04-03 Airworthiness Directives; The Boeing Company Airplanes
Models named: 747-400F series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all The Boeing Company Model 747-400F series airplanes, certificated in any category, as identified in paragraph 1.A., “Effectivity,” of Boeing Alert Service Bulletin 747-53A2880, dated December 3, 2014.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Except as required by paragraph (h) of this AD: At the applicable time specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 747-53A2880, dated December 3, 2014, do a detailed inspection of the upper closure fitting, strap, and doubler and a surface high frequency eddy current (HFEC) inspection of the upper closure fitting at the nose cargo door portal for cracking, and do all applicable related investigative and corrective actions, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 747-53A2880, dated December 3, 2014. Repeat the inspections at the time specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 747-53A2880, dated December 3, 2014. Do the applicable related investigative and corrective actions at the times specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 747-53A2880, dated December 3, 2014.
Unsafe condition
This AD was prompted by a report that an analysis of the production methods used to increase fatigue resistance of the upper closure fittings at the nose cargo door portal's C-3 frame showed that cracking could still start too early to be caught in a timely manner by the inspection or maintenance program. We are issuing this AD to detect and correct such cracking, which could result in sudden decompression and loss of the airplane's structural integrity.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1