Summary
This document proposes adopting a new airworthiness directive (AD) for Eurocopter France (ECF) Model AS332C, L, L1, and L2; AS350B, BA, B1, B2, B3, and D; AS355E, F, F1, F2, and N; AS-365N2; AS 365 N3; SA330F, G, and J; SA-360C; SA-365C, C1, and C2; SA.316B and C; and SA.319B helicopters. This proposal would require a one-time measurement of the electrical resistance between the ferry fuel tank (tank) electrostatic ground connector and the tank filler neck before the next refueling of an installed tank or before the first fueling after installing a tank. If the electrical resistance has a value more than 1.5 milliohms, this proposal would prohibit refueling the tank. This proposal is prompted by reports of an inadequate electrical bond between the electrostatic ground connector and its support on several tank installations. The actions specified by the proposed AD are intended to prevent refueling a tank that is not adequately electrically bonded, which could generate an electric arc between the refueling nozzle and the tank, causing an explosion.