Airworthiness Directive · Amendment 39-14740 · McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 Series Airplanes
McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 Series Airplanes
This AD applies to all McDonnell Douglas Model DC-9-11, DC-9-12, DC-9-13, DC-9-14, DC-9-15, DC-9-15F, DC-9-21, DC-9-31, DC-9-32, DC-9-32 (VC-9C), DC- 9-32F, DC-9-32F (C-9A, C-9B), DC-9-33F, DC-9-34, DC-9-34F, DC-9-41, and DC-9-51 airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 series airplanes. This AD requires replacing the clamp bases for the fuel vent pipe with improved clamp bases. This AD results from reports that the foil wrapping on existing plastic clamp bases has migrated out of position, which compromises the bonding of the fuel vent lines to the airplane structure. We are issuing this AD to ensure that the fuel vent lines are properly bonded to the airplane structure. Improper bonding could prevent electrical energy from a lightning strike from dissipating to the airplane structure, and create an ignition source, which could result in a fuel tank explosion.
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, replace the existing clamp bases for the fuel vent line with improved metal clamp bases, by doing all of the applicable actions in accordance with the Accomplishment Instructions of Boeing Service Bulletin DC9-28-211, Revision 1, dated June 21, 2006. Any corrective action that is required following the conductivity verification, which is included in the replacement procedures, must be done before further flight.
Replacement of clamp bases accomplished before the effective date of this AD in accordance with Boeing Service Bulletin DC9-28-211, dated February 23, 2005, is acceptable for compliance with the corresponding action required by paragraph (f) of this AD.
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.
