Airworthiness directives › 2020-22-04
AD 2020-22-04 Airworthiness Directives; Airbus Helicopters Deutschland GmbH
Applicability*9
This AD applies to all Airbus Helicopters Deutschland GmbH Model EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, EC135T3, and EC635T2+ helicopters, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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 2020-0099, dated May 5, 2020 (EASA AD 2020-0099).
Unsafe condition
This AD was prompted by reports of improper heat treatment of titanium (Ti)-bolts installed on the forward and aft tail rotor drive shafts, resulting in a broken Ti-bolt. The FAA is issuing this AD to address improper heat treatment of Ti-bolts on the forward and aft tail rotor drive shafts, which could lead to rupture of a Ti-bolt installed in a critical location, possibly resulting in reduced control of the helicopter.
Affected ADs
None.
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