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Airworthiness directives › 2023-03-04

AD 2023-03-04 Airworthiness Directives; The Boeing Company Airplanes

2023-04-04
2023-02-28
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Airframe
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Models named: 777-200, -200LR, -300, -300ER, 777F 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 777-200, -200LR, -300, -300ER, and 777F series airplanes, certificated in any category.

Compliance

Comply with this AD within the compliance times specified, unless already done.

Required actions

For airplanes identified in Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021: Except as specified in paragraph (h) of this AD, at the applicable times specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021, do all applicable actions ( i.e., installation of Teflon sleeves, cap sealing of fasteners, detailed inspections, and corrective actions) identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021.

Unsafe condition

This AD was prompted by fuel system reviews conducted by the manufacturer. The FAA is issuing this AD to prevent arcing inside the main and center fuel tanks in the event of a fault current or lightning strike, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.

Affected ADs

(1) This AD affects AD 2017-11-14, Amendment 39-18913 (82 FR 25954, June 6, 2017) (AD 2017-11-14). (2) This AD also affects AD 2021-24-12, Amendment 39-21833 (86 FR 73660, December 28, 2021) (AD 2021-24-12).

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