AD 2020-11-05 Requires Repetitive Inspections Of The Tail Rotor Hub Body

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Model EC120B helicopters.

This AD was prompted by a report of recurrent loss of tightening torque on several attachment bolts of the tail rotor hub body. This AD requires repetitive inspections of the tail rotor hub body for cracks and applicable corrective actions if necessary, and repetitive replacement of the attachment bolts, washers, and nuts of the tail rotor hub body. The FAA is issuing this AD to address the unsafe condition on these products.

This AD becomes effective June 8, 2020.

Supplementary Information: EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 2019-0272R1, dated November 18, 2019 (referred to after this as the Mandatory Continuing Airworthiness Information or “the MCAI”), to correct an unsafe condition for all Airbus Helicopters EC120B helicopters. EASA advises that an inspection of the tail rotor hub body revealed a recurring loss of tightening torque on several attachment bolts. EASA advises that this condition, if not detected and corrected, could lead to cracking and potential loss of the tail rotor drive and consequent loss of yaw control of the helicopter. The MCAI requires repetitive inspections of the tail rotor hub body for cracks and applicable corrective actions if necessary, as well as repetitive replacement of the associated attachment bolts, washers, and nuts.

FMI: www.regulations.gov