Airworthiness Directive · Amendment 39-16641 · Fuel
The Boeing Company Model DC-9-14, DC-9-15, and DC-9-15F Airplanes; and DC-9-20, DC-9-30, DC-9-40, and DC-9-50 Series Airplanes
This AD applies to The Boeing Company Model 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), DC-9-32F (C9-B), DC-9-33F, DC-9-34, DC-9-34F, DC-9-41, and DC-9-51 airplanes, certificated in any category; as identified in Boeing Service Bulletin DC9-28-217, Revision 1, dated August 12, 2010.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD requires installing new in-line fuses for the fuel level float switch and new in-line fuses for the pressure switch, as applicable, and changing the wiring. The proposed actions would affect the left and right wing forward spars, center wing forward spar, forward auxiliary fuel tank, and aft auxiliary fuel tank, as applicable. This AD was prompted by fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent the potential of ignition sources inside fuel tanks, which, in combination with flammable fuel vapors, could result in fuel tank explosions and consequent loss of the airplane.
Comply with this AD within the compliance times specified, unless already done.
Within 60 months after the effective date of this AD: Install new in-line fuses for the fuel level float switch and new in-line fuses for the pressure switch, as applicable; and change the wiring; on the left and right wing forward spars, center wing forward spar, forward auxiliary fuel tank, and aft auxiliary fuel tank, as applicable; in accordance with the Accomplishment Instructions of Boeing Service Bulletin DC9-28-217, Revision 1, dated August 12, 2010.
Actions done before the effective date of this AD in accordance with Boeing Service Bulletin DC9-28-217, dated December 1, 2009, are acceptable for compliance with the requirements of paragraph (g) of this AD.
