Airworthiness Directive · Amendment 39-19797 · Fuel
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 727, 727-100, 727C, 727-100C, 727-200, and 727-200F series airplanes; certificated in any category; equipped with Boeing body-mounted auxiliary fuel tanks.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 727 airplanes. This AD was prompted by the FAA's analysis of the Model 727 fuel system review conducted by the manufacturer. This AD requires modifying the fuel quantity indicating system (FQIS) to prevent development of an ignition source inside the body-mounted auxiliary fuel tanks due to electrical fault conditions. As an alternative to the modification, this AD allows deactivating the body-mounted auxiliary fuel tanks. The FAA is issuing this AD to address the unsafe condition on these products.
Within 12 months after the effective date of this AD, do the actions specified in either paragraph (g)(1) or (2) of this AD, using a method approved in accordance with the procedures specified in paragraph (h) of this AD.
(1) Modify the fuel quantity indicating system (FQIS) to prevent development of an ignition source inside the body-mounted auxiliary fuel tanks due to electrical fault conditions.
(2) Deactivate the body-mounted auxiliary fuel tanks.
