Airworthiness Directive · Amendment 39-21240 · Main rotor brake
Leonardo S.p.a. Helicopters
This AD applies to Leonardo S.p.a. Model AB412 and AB412EP helicopters, certificated in any category, with a rotor brake pinion (pinion) part number (P/N) 412-040-301-101 installed.
The FAA is superseding Airworthiness Directive (AD) 2014-12-07 for Agusta S.p.A (Agusta) Model AB412 and AB412EP helicopters. AD 2014- 12-07 requires inspecting the rotor brake pinion (pinion) for a crack and replacing it if there is a crack. This AD retains the requirements of AD 2014-12-07 and also requires removing certain serial-numbered pinions from service. This AD was prompted by a report of an additional cracked pinion. The actions of this AD are intended to address an unsafe condition on these products.
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
(1) Within 75 hours time-in-service (TIS), remove from service:
(i) Pinion P/N 412-040-301-101 with serial number C17987;
(ii) Pinion P/N 412-040-301-101 with serial number C17990; and
(iii) Pinion P/N 412-040-301-101 with serial number C17991.
(2) Within 100 hours TIS, if the rotor brake quill has never been overhauled, perform a magnetic particle inspection on each pinion for a crack. If there is a crack, before further flight, remove the pinion from service.
(3) As of the effective date of this AD, do not install pinion P/N 412-040-301-101 with serial number C17987, C17990, or C17991 on any helicopter.
