Airworthiness Directive · Amendment 39-21392 · Main rotor gearbox
Airbus Helicopters
This AD applies to all Airbus Helicopters Model EC 155B and EC155B1 helicopters, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Model EC 155B and EC155B1 helicopters. This AD was prompted by a report that non-destructive tests of the main gearbox (MGB) housing may have been evaluated incorrectly during production. This AD requires replacing affected MGBs with serviceable MGBs, 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) AD 2020-0043, dated March 2, 2020 (EASA AD 2020-0043).
(1) Where EASA AD 2020-0043 refers to its effective date, this AD requires using the effective date of this AD.
(2) Where EASA AD 2020-0043 specifies to do the replacement “within 10 flight hours or 75 days, whichever occurs first after the effective date of this AD,” for this AD, the compliance time for the replacement is within 10 hours time-in-service after the effective date of this AD.
(3) Although the service information referenced in EASA AD 2020-0043 specifies to return certain parts, this AD does not include that requirement.
(4) The “Remarks” section of EASA AD 2020-0043 does not apply to this AD.
