Airworthiness Directive · Amendment 39-16574 · Fuel
The Boeing Company Model MD-11 and MD-11F Airplanes
This AD applies to The Boeing Company Model MD-11 and MD-11F airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin MD11-28A124, Revision 1, dated August 24, 2010.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD requires a one-time inspection to detect damage of the wire assemblies of the tail tank fuel system, a wiring change, and corrective actions if necessary. This AD also requires, for certain airplanes, a general visual inspection for correct installation of the self-adhering high-temperature electrical insulation tape; installation of a wire assembly support bracket and routing wire assembly; changing wire supports; and installation of a wire protection bracket. This AD was prompted by fuel system reviews conducted by the manufacturer. We are issuing this AD to detect and correct a potential of ignition sources inside fuel tanks, which, in combination with flammable vapors, could result in a fuel tank fire or explosion, and consequent loss of the airplane.
Comply with this AD within the compliance times specified, unless already done.
For airplanes in Group 1, Configuration 1; and Group 2, Configuration 1: Within 60 months after the effective date of this AD, perform a general visual inspection to detect damage of wire assemblies of the tail tank fuel system, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD11-28A124, Revision 1, dated August 24, 2010.
(1) For airplanes in Group 1, Configuration 1: If no damage is found, before further flight, apply self-adhering high-temperature electrical insulation tape on the wire assemblies, install wire assembly support brackets, route wire assemblies, install extruded channel wire supports, and install a wire protection bracket, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD11-28A124, Revision 1, dated August 24, 2010.
(2) For airplanes in Group 1, Configuration 1: If damage is found, before further flight, repair or replace the wire assemblies, apply self-adhering high-temperature electrical insulation tape on the wire assemblies, install wire assembly support brackets, route wire assemblies, install extruded channel wire supports, and install a wire protection bracket, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD11-28A124, Revision 1, dated August 24, 2010.
(3) For airplanes in Group 2, Configuration 1: If no damage is found, before further flight, install wire assembly support brackets, route wire assemblies, install extruded channel wire supports, and install a wire protection bracket, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD11-28A124, Revision 1, dated August 24, 2010.
(4) For airplanes in Group 2, Configuration 1: If damage is found, before further flight, repair or replace the wire assemblies, install wire assembly support brackets, route wire assemblies, install extruded channel wire supports, and install a wire protection bracket, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD11-28A124, Revision 1, dated August 24, 2010.
(h) For airplanes in Group 1, Configuration 2: Within 60 months after the effective date of this AD, do a general visual inspection for correct installation of the self-adhering high-temperature electrical insulation tape, and change the wire supports, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD11-28A124, Revision 1, dated August 24, 2010. If the self-adhering high-temperature electrical insulation tape is installed incorrectly, before further flight, adjust the tape installation to achieve the correct dimensions, in accordance with Figure 1 of Boeing Alert Service Bulletin MD11-28A124, Revision 1, dated August 24, 2010.
(i) For airplanes in Group 2, Configuration 2: Within 60 months after the effective date of this AD, change the wire supports, in accordance with Figure 2 of Boeing Alert Service Bulletin MD11-28A124, Revision 1, dated August 24, 2010.
