Airworthiness directives › 2019-08-09
AD 2019-08-09 Airworthiness Directives; The Boeing Company Airplanes
Models named: 747-8, 747-8F 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 747-8 and 747-8F series airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For airplanes identified in Boeing Alert Service Bulletin 747-54A2247, dated August 3, 2017: Except as required by paragraph (h) of this AD, at the applicable times specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 747-54A2247, dated August 3, 2017, do all applicable actions identified as “RC” (required for compliance) in, and in accordance with, the Accomplishment Instructions of Boeing Alert Service Bulletin 747-54A2247, dated August 3, 2017. (2) For airplanes not identified in Boeing Alert Service Bulletin 747-54A2247, dated August 3, 2017: Within 4 years or 4,800 flight cycles after the effective date of this AD, whichever occurs first, inspect to determine if any part number identified in paragraphs (g)(2)(i) through (g)(2)(v) of this AD is installed. If any part number specified in paragraphs (g)(2)(i) through (g)(2)(v) of this AD is installed, within 4 years or 4,800 flight cycles after the effective date of this AD, whichever occurs first, replace the part with a part number that is identified as an acceptable replacement in Boeing Alert Service Bulletin 747-54A2247, dated August 3, 2017. A review of airplane maintenance records is acceptable in lieu of this inspection if the part numbers specified in paragraphs (g)(2)(i) through (g)(2)(v) of this AD can be conclusively determined from that review. (i) An access panel lateral restraint with part number (P/N) 321U8595-1, 321U8595-2, 321U8595-3, or 321U8595-4. (ii) A block seal with P/N 323U8452-2. (iii) A vapor seal with P/N 323U8452-3. (iv) A heatshield seal with P/N 323U8852-1. (v) A heatshield seal retainer P/N 323U8852-2.
Unsafe condition
This AD was prompted by reports of damaged vapor seals, block seals, and heat shield seals on the outboard pylons between the engine strut and aft fairing. We are issuing this AD to address heat damage to the vapor seals between the engine strut and aft fairing. Such damage could allow flammable fluid leakage out of the aft fairing, which could result in an uncontrolled fire in the engine strut.
Affected ADs
This AD affects AD 2017-04-13, Amendment 39-18808 (82 FR 11795, February 27, 2017) (“AD 2017-04-13”).
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