The comment deadlines for a notice of proposed rulemaking (NPRM) to incorporate technology to reduce flammability exposure in fuel tanks and a related advisory circular have been extended from March 23 to May 8. The proposal, published last November, would cover new airframe designs and existing transport airplanes with a payload capacity of 7,500 pounds or more, as well as some 3,200 in-service Airbus and Boeing airplanes with center-wing fuel tanks. For more information, contact the FAA in Renton, Wash., at (425) 227-2132. Meanwhile, the agency is reviewing nearly 70 comments it received to an October NPRM, also dealing with improving fuel tank safety.