Action
Notice of proposed rulemaking (NPRM).
Summary
We propose to supersede two existing airworthiness directives (AD) that apply to certain Fokker Services B.V. Model F.28 Mark 0100 airplanes. The first existing AD currently requires removing the actuator from the fuel-balance transfer-valve (FBTV) and installing a locking device on the FBTV. The second existing AD currently requires inspecting to verify that the position indicator of the FBTV is in the closed position and deactivating the fuel-balance transfer-system. Since we issued those ADs, we have received reports that the FBTV was inadvertently reactivated after required de-activation measures were undone. This proposed AD would require installing an FBTV locking device. We are proposing this AD to prevent fuel starvation and consequently a double-engine flameout, possibly resulting in a forced landing, damage to the airplane, and injury to occupants.