Airworthiness Directive · Amendment 39-21901 · Hydraulic power system wiring
Airbus Helicopters
This AD applies to Airbus Helicopters Model AS350B, AS350B2, AS350B3, and AS350BA helicopters, certificated in any category, serial numbers 1241, 1525, 1601, 1708, 1825, 1910, 1973, 2056, 2072, 2361, 2394, 3170, 3223, 3479, 3789, 9005, 9010, and 9035.
The FAA is adopting a new airworthiness directive (AD) for certain Airbus Helicopters Model AS350B, AS350B2, AS350B3, and AS350BA helicopters. This AD was prompted by a report that a modification of the electrical wiring of the hydraulic system was wrongly embodied on certain helicopters, and a wiring non-conformity caused the solenoid of the tail rotor (TR) load compensator to de-energize when the "HYD" cut-off switch was activated. This AD requires installing a placard in the cockpit, in full view of the pilots; a functional check of the main rotor (MR) and TR servo actuator solenoids, and corrective actions (modification) if necessary; a modification (unless already done); and, after corrective actions or modification, optional removal of the placard, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified in paragraph (h) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, European Union Aviation Safety Agency (EASA) Emergency AD 2021-0123-E, dated May 7, 2021 (EASA AD 2021-0123-E).
(1) Where EASA AD 2021-0123-E refers to its effective date, this AD requires using the effective date of this AD.
(2) The “Remarks” section of EASA AD 2021-0123-E does not apply to this AD.
(3) Where EASA AD 2021-0123-E refers to flight hours (FH), this AD requires using hours time-in-service.
(4) Where Paragraph (1) of EASA AD 2021-0123-E specifies “do not perform any training of in-flight hydraulic off as specified in FMS SUP.7,” this AD requires installing a placard in the cockpit, in full view of the pilots, with the specific statement “Do not perform any training of in-flight hydraulic off as specified in FMS SUP.7.”
(5) Where EASA AD 2021-0123-E refers to “discrepancies,” for the purposes of this AD the definition of “discrepancies” is failure of the functional check.
(6) Where the service information referenced in EASA AD 2021-0123-E specifies to scrap certain wires, this AD requires removing those wires from service.
Although the service information referenced in EASA AD 2021-0123-E specifies to submit certain information to the manufacturer, this AD does not include that requirement.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
