Airworthiness Directive · Amendment 39-15192 · McDonnell Douglas Model MD-11, MD-11F, DC-10-30 and DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F, and MD-10-30F Airplanes
McDonnell Douglas Model MD-11, MD-11F, DC-10-30 and DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F, and MD-10-30F Airplanes
This AD applies to McDonnell Douglas Model MD-11, MD-11F, DC-10-30 and DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F, and MD-10-30F airplanes, certificated in any category; as identified in Boeing Service Bulletins DC10-28-250 and MD11-28-129, both dated July 26, 2006.
The FAA is adopting a new airworthiness directive (AD) for certain McDonnell Douglas Model MD-11, MD-11F, DC-10-30 and DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F, and MD-10-30F airplanes. This AD requires measuring the electrical resistance of the bond between the No. 2 fuel transfer pump adapter surface of the fuel tank and the fuel transfer pump housing flange, and performing corrective and other specified actions as applicable. This AD results from a design review of the fuel tank systems. We are issuing this AD to prevent inadequate bonding between the No. 2 fuel transfer pump adapter surface of the fuel tank and the fuel transfer pump housing flange. Inadequate bonding could result in a potential ignition source inside the fuel tank if the fuel transfer pump and structure interface are not submerged in fuel, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 60 months after the effective date of this AD: Measure the electrical resistance of the bond between the No. 2 fuel transfer pump adapter surface of the fuel tank and the fuel transfer pump housing flange in accordance with the Accomplishment Instructions of Boeing Service Bulletin DC10-28-250 or MD11-28-129, both dated July 26, 2006, as applicable.
(1) If the resistance measurement is 2.5 milliohms or less: No further action is required by this paragraph.
(2) If the resistance measurement is more than 2.5 milliohms: Before further flight, electrically bond the fuel tank No. 2 fuel transfer pump housing surfaces in accordance with the service bulletin.
(3) Before further flight thereafter, do an electrical resistance bonding test to verify the electrical resistance between the fuel transfer pump housing and the structure is 2.5 milliohms maximum. If that electrical resistance is not achieved, rework the electrical bond until the electrical resistance is achieved. Do the actions in accordance with the service bulletin.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
