AD 2026-16-01: Airbus Helicopters

What the FAA requires

The FAA is adopting a new airworthiness directive (AD) for certain Airbus Helicopters Model AS350B, AS350BA, AS350B1, AS350B2, AS350B3, AS350D, EC130B4, and EC130T2 helicopters. This AD was prompted by reports of an incorrectly installed engine flange on the main gear box (MGB) engine coupling. This AD requires inspecting the MGB engine coupling for correct installation and, depending on the results, corrective actions. The FAA is issuing this AD to address the unsafe condition on these products.

Read the full directive on the Federal Register →

Applicability

Papillon requested the FAA revise the applicability of the NPRM, to apply not only to the production date of the helicopters but also that the NPRM apply to helicopters with less than 3,500 total flight hours. Papillon stated the date ranges are too broad and they do not address high usage aircraft. Papillon also stated that aircraft with more than 3,500 flight hours have likely already replaced the engine and gearboxes [MGB] and would therefore no longer be affected by the unsafe condition. The FAA disagrees with revising the applicability of this final rule. The FAA is unable to determine how many helicopters may have replaced the MGBs or engines before 3,500 total hours time-in-service (T

Part numbers this directive names

This directive does not name specific part numbers in its text; it applies by aircraft model. See the applicability above and the manufacturer's service bulletin it references.