Airworthiness Directive · Amendment 39-16882 · Horizontal stabilizer structure
The Boeing Company Airplanes
The Boeing Company Model MD-11 and MD-11F airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin MD11-55-027, dated March 17, 2011.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model MD-11 and MD-11F airplanes. This AD was prompted by a report that the rub strips attached to the horizontal stabilizer front spar access door location were manufactured improperly using anodized aluminum. This AD requires replacing the anodized rub strips with new alodined rub strips to prevent inadequate electrical bonding between the rub strips and the fuel access door, which can contribute to possible ignition of flammable fuel vapor in the tail fuel tank as a result of a lightning strike. We are issuing this AD to correct the unsafe condition on these products.
Within 60 months after the effective date of this AD, replace the anodized rub strips with new alodined rub strips, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin MD11-55-027, dated March 17, 2011.
