This amendment adopts a new AD for Agusta Model AB412 Series helicopters. This action requires inspecting the tip block and the tip closure for adhesive bond voids and removing any blade with an excessive void from service. This action also requires modifying certain blades by installing shear pins and tip closure rivets in the tip area of all affected blades. This amendment is prompted by reports of in-flight loss of tip blocks and tip closures resulting in minor to substantial damage. This condition, if not detected, could result in loss of a tip block or tip closure, loss of a blade, and subsequent loss of control of the helicopter.
Ente Nazionale per l'Aviazione Civile (ENAC), the airworthiness authority for Italy, notified the FAA that an unsafe condition may exist on Agusta Model AB 205A1, AB212, and AB412 helicopters. ENAC advises modifying the blade tip block and tip closure retention.
Agusta has issued Bollettino Tecnico No. 412-88, Revision A, dated August 17, 2004 (BT 412-88, Revision A), which specifies inspecting and modifying blade, part number (P/N) 212-010-750-ALL, tip block and tip closure retention by providing additional fasteners in the tip area to prevent future loss of either the tip block or tip closure. Recent investigations into the in-flight loss of a blade, P/N 212-010-750-105, tip block, revealed that the countersunk screws retaining the tip block were installed incorrectly resulting in inadequate tip block retention. Additionally, reports have been submitted of the loss of the tail rotor tip cap closure possibly due to an inadequate bond in this area. ENAC classified this service information as mandatory and issued AD 2004- 351, dated September 3, 2004, to ensure the continued airworthiness of these helicopters in Italy.
These helicopter models are manufactured in Italy and are type certificated for operation in the United States under the provisions of 14 CFR 21.29 and the applicable bilateral agreement. Pursuant to the applicable bilateral agreement, ENAC has kept the FAA informed of the situation described above. The FAA has examined the findings of ENAC, reviewed all available information, and determined that AD action is necessary for products of these type designs that are certificated for operation in the United States.
This unsafe condition is likely to exist or develop on other helicopters of the same type designs if they become registered in the United States. Therefore, this AD is being issued to prevent loss of the tip block or tip closure, loss of a blade, and subsequent loss of control of the helicopter. This AD requires, within 100 hours time-in- service (TIS):
Inspecting the tip block and tip closure for voids and, before further flight, removing any blade that has voids in excess of the Component Repair and Overhaul Manual Limitations.
Inspecting the tip block attachment countersink screws in four locations to determine if the head of each countersunk screw is flush with the surface of the abrasion strip and the skin. If any of the screws are set below the surface of the abrasion strip and the skin or are covered with filler material, before further flight, install shear pins.
Installing tip closure rivets on all affected blades.
Accomplish the actions in accordance with the service bulletin described previously.
None of the Agusta Model AB412 Series helicopters affected by this action are on the U.S. Register. All helicopters included in the applicability of this rule are currently operated by non-U.S. operators under foreign registry; therefore, they are not directly affected by this AD action. However, the FAA considers that this rule is necessary to ensure that the unsafe condition is addressed in the event that any of these subject helicopters are imported and placed on the U.S. Register in the future.
Should an affected helicopter be imported and placed on the U.S. Register in the future, it would takeapproximately 3 work hours to accomplish the required actions at an average labor rate of $65 per work hour. Required parts would cost $25. Based on these figures, the cost impact of this AD would be $220 per helicopter.
Since this AD action does not affect any helicopter that is currently on the U.S. register, it has no adverse economic impact and imposes no additional burden on any person. Therefore, notice and public procedures hereon are unnecessary and the amendment may be made effective in less than 30 days after publication in the Federal Register.
Comments Invited
This AD is a final rule that involves requirements that affect flight safety and was not preceded by notice and an opportunity for public comment; however, we invite you to submit any written data, views, or arguments regarding this AD. Send your comments to an address listed under ADDRESSES. Include "Docket No. FAA-2005-21589; Directorate Identifier 2004-SW-44-AD" at the beginning of your comments. Wespecifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the AD. We will consider all comments received by the closing date and may amend the AD in light of those comments.
We will post all comments we receive, without change, to http://dms.dot.gov , including any personal information you provide. We will also post a report summarizing each substantive verbal contact with FAA personnel concerning this AD. Using the search function of our docket web site, you can find and read the comments to any of our dockets, including the name of the individual who sent the comment. You may review the DOT's complete Privacy Act Statement in the Federal Register published on April 11, 2000 (65 FR 19477-78), or you may visit http://dms.dot.gov .
Regulatory Findings
We have determined that notice and prior public comment are unnecessary in promulgating this regulation; therefore, it can be issued immediately to correct an unsafe condition in aircraft since none of these model helicopters are registered in the United States. We have also determined that this regulation is not a "significant regulatory action" under Executive Order 12866. It has been determined further that this action involves an emergency regulation under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979). If it is determined that this emergency regulation otherwise would be significant under DOT Regulatory Policies and Procedures, a final regulatory evaluation will be prepared and placed in the AD docket.
Authority for This Rulemaking
Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, Section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency's authority.
We are issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701, "General requirements." Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
Adoption of the Amendment
Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration
amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows:
PART 39--AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
2. Section 39.13 is amendedby adding a new airworthiness directive to read as follows: