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Notice of proposed rulemaking (NPRM).

The FAA proposes to adopt a new airworthiness directive (AD) for certain Airbus Helicopters Deutschland GmbH Model EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, and EC135T3 helicopters. This proposed AD would require removing certain Titanium (Ti) bolts from service and prohibit installing these Ti-bolts in a critical area. This proposed AD was prompted by a report of a broken Ti-bolt. The FAA is proposing this AD to address the unsafe condition on these products.

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