Airworthiness Directive · Amendment 39-17007 · Tail rotor blades
Agusta S.p.A. Helicopters
This AD applies to Agusta S.p.A. Model AB412 helicopters with the following tail rotor blades installed:
| Part No. | Serial No. |
|---|---|
| 212-010-750-105 | A-11923. |
| 212-010-750-105FM | A-10090, A-10836, A-10857, A-11207, A-11332, A-11617, A-11828, A-12043, or A-12091. |
| 212-010-750-113 | A-14953, A-15090, or CS-12702. |
| 212-010-750-113FM | A-12240, A-12286, A-12296, A-12398, A-12640, A-12670, A-12789, A-13033, A-13088, A-13096, A-13106, A-13134, A-13199, A-13264, A-13366, or A-13539. |
| 212-010-750-133 | A-15602. |
We are adopting a new airworthiness directive (AD) for Agusta S.p.A. (Agusta) Model AB412 helicopters with certain tail rotor blades (blades) installed. This AD requires, before further flight, removing and replacing each affected blade with an airworthy blade. This AD is prompted by incidents where a blade tip weight separated from a blade in flight on other model helicopters with common part-numbered blades. It has been determined that this unsafe condition may also exist on the specified Agusta model helicopters. The actions specified in this AD are intended to prevent loss of the blade tip weight, loss of a blade, and subsequent loss of control of the helicopter.
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.
Before further flight, replace any affected blade with an airworthy blade, defined as one that has a part number and a serial number not listed in the Applicability section of this AD.
