Summary
This action withdraws a notice of proposed rulemaking (NPRM) that proposed a new airworthiness directive (AD), applicable to Eurocopter Deutschland GmbH (ECD) (Eurocopter Deutschland) Model BO 105 C and BO 105 S helicopters. That action would have required modifying the main relay box by replacing the voltage regulator; modifying the cockpit overhead panel by installing two additional switches; and performing a functional test of the new voltage regulator, generators, and new switches. Since the issuance of the NPRM, the Federal Aviation Administration (FAA) has determined that the modification proposed is only necessary for Instrument Flight Rule (IFR) configurations, and since there is no IFR FAA type-design approval for the affected models, it is unnecessary to issue an AD.