Airworthiness directives › 2016-18-04
AD 2016-18-04 Airworthiness Directives; The Boeing Company Airplanes
Models named: 747-8, 747-8F. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 747-8 and 747-8F airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 747-71-2332, Revision 1, dated May 28, 2015.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
This paragraph restates the actions required by paragraph (g) of AD 2013-24-12, with revised service information. For airplanes identified in Boeing Service Bulletin 747-71A2329, Revision 1, dated May 28, 2015: Except as required by paragraph (h)(1) of this AD, at the time specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 747-71A2329, dated September 27, 2013, do the inspection specified in paragraph (g)(1) or (g)(2) of this AD, and do all applicable related investigative and corrective actions, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 747-71A2329, dated September 27, 2013; or Boeing Service Bulletin 747-71A2329, Revision 1, dated May 28, 2015. Do all applicable related investigative and corrective actions before further flight. Repeat the inspection thereafter at the times specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 747-71A2329, dated September 27, 2013. As of the effective date of this AD, use only Boeing Service Bulletin 747-71A2329, Revision 1, dated May 28, 2015. (1) Ultrasonic inspection for cracking of the barrel nuts on each forward engine mount, except as required by paragraph (h)(2) of this AD. (2) Dye penetrant inspection for cracking of the bolts and barrel nuts. Whenever a dye penetrant inspection is done, all the bolts and barrel nuts on that engine mount must be removed and replaced with new or serviceable parts.
Unsafe condition
This AD was prompted by a report of cracked barrel nuts found on a forward engine mount, and by the determination that additional actions are necessary to address the unsafe condition. We are issuing this AD to detect and correct cracked barrel nuts on a forward engine mount, which could result in reduced load capacity of the forward engine mount, separation of an engine under power from the airplane, and consequent loss of control of the airplane.
Affected ADs
This AD replaces AD 2013-24-12, Amendment 39-17686 (78 FR 71989, December 2, 2013) (“AD 2013-24-12”).
Read the original on the Federal Register →
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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