Airworthiness Directive · Amendment 39-19015 · Wings
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 747-57-2332, Revision 2, dated February 22, 2016.
We are superseding Airworthiness Directive (AD) 2012-05-03, which applied to certain The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes. AD 2012-05-03 required modifying the fluid drain path in the leading edge area of the wing. This AD requires additional work to seal those drainage holes in the wing access panels. This AD was prompted by a design review following a ground fire incident and reports of flammable fluid leaks from the wing leading edge area onto the engine exhaust area. We are issuing this AD to address the unsafe condition on these products.
This paragraph restates the requirements of paragraph (g) of AD 2012-05-03, with revised service information. Within 60 months after April 24, 2012 (the effective date of AD 2012-05-03), modify the fluid drain path in the leading edge area of the wing, in accordance with all applicable parts of the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-57-2332, Revision 1, dated July 25, 2011; or Revision 2, dated February 22, 2016.
This paragraph restates the provisions of paragraph (h) of AD 2012-05-03, with no changes. This paragraph provides credit for modification of the fluid drain path required by paragraph (g) of this AD, if the modification was performed before April 24, 2012, using Boeing Special Attention Service Bulletin 747-57-2332, dated November 9, 2010.
For airplanes on which the actions specified in Boeing Special Attention Service Bulletin 747-57-2332, dated November 9, 2010; or Revision 1, dated July 25, 2011; were done: Within 2 years after the effective date of this AD, fill the drainage holes in wing panels 521EB and 621EB with sealant, in accordance with Part 5 of the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-57-2332, Revision 2, dated February 22, 2016.
