AD 99-10-15 ACTIVE

This amendment adopts a new airworthiness directive (AD) that is applicable to AS332L2 helicopters. This action requires inspecting each main rotor head drag damper (damper) for a tear, crack, or bonding separation in the elastomer and, if necessary, replacing the damper with an airworthy damper. This amendment is prompted by a report of increased helicopter vibration in flight that was traced to the delamination of the elastomer on a damper. This condition, if not corrected, could result in failure of a damper and subsequent loss of control of the helicopter.

Final rule; request for comments

99-10-15 EUROCOPTER FRANCE: Amendment 39-11168. Docket No. 99-SW-09-AD. \n\tApplicability: AS332L2 helicopters, with main rotor head drag damper, part number (P/N) 332A311980-02, having elastomeric bearings P/N J19084-4, installed, certificated in any category. \n\n\tNOTE 1: This AD applies to each helicopter identified in the preceding applicability provision, regardless of whether it has been otherwise modified, altered, or repaired in the area subject to the requirements of this AD. For helicopters that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it. \n\n\tCompliance: Required as indicated, unless accomplished previously. \n\n\tTo detect delamination of an elastomeric bearing that could result in failure of a main rotor head drag damper (damper) and subsequent loss of control of the helicopter, accomplish the following: \n\n\t(a)\tWithin 10 hours time-in-service (TIS), inspect each damper, P/N 332A311980-02, for a tear, crack, or bonding separation in the elastomer as follows: (See Figure 1.) \n\n\t\t(1)\tSeparate the elastomer in Area A (outside reinforcement) and in area B (inside reinforcement). \n\n\t\t(2)\tIf a tear, crack, or bonding separation is found, replace the damper with an airworthy damper. \n\n\tNOTE 2: American Eurocopter Master Servicing Recommendation (PRE) 05.99.00, rush revision date-code 97-46, and the Aircraft Maintenance Manual Nos. 05.21.00.213 and 05.21.00.213.001 pertain to the subject of this AD. \n\n\t(b)\tThereafter, prior to the first flight of each day or at intervals not to exceed 20 hoursTIS, whichever occurs first, perform the inspection in paragraph (a). If a tear, crack, or bonding separation is found in the elastomer, replace the damper with an airworthy damper. \n\n\t(c)\tAn alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Rotorcraft Standards Staff. Operators shall submit their requests through an FAA Principal Maintenance Inspector who may concur or comment and then send it to the Manager, Rotorcraft Standards Staff. \n\n\tNOTE 3: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Rotorcraft Standards Staff. \n\n\t(d)\tSpecial flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the helicopter to a location where the requirements of this AD can be accomplished. \n\n\t(e)\tThis amendment becomes effective on May 26, 1999. \n\n\tNOTE 4: The subject of this AD is addressed in Direction Generale De L'Aviation Civile (France) AD 97-378-009(AB), dated December 17, 1997.

The Direction Generale De L'Aviation Civile (DGAC), the airworthiness authority for France, has notified the FAA that an unsafe condition may exist on Eurocopter France Model AS332L2 helicopters. The DGAC advises that it has received a report of damper elastomer impending separation on this model helicopter. \n\n\tThis helicopter model is manufactured in France and is type certificated for operation in the United States under the provisions of section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and the applicable bilateral airworthiness agreement. Pursuant to this bilateral airworthiness agreement, the DGAC has kept the FAA informed of the situation described above. The FAA has examined the findings of the DGAC, reviewed all available information, and determined that AD action is necessary for products of this type design that are certificated for operation in the United States. \n\n\tSince an unsafe condition has been identified that is likely to exist or develop on other Eurocopter France Model AS332L2 helicopters of the same type design registered in the United States, this AD is being issued to prevent failure of a damper. This AD requires inspecting each damper for a tear, crack, or bonding separation in the elastomer and, if necessary, replacing the damper with an airworthy damper. \n\n\tNone of the Model AS332L2 helicopters affected by this action are on the U.S. Register. All helicopters included in the applicability of this rule are 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. \n\n\tShould an affected helicopter be imported and placed on the U.S. Register in the future, it would require approximately 2/3 of a work hour to accomplisheach of the inspections initially and to replace unairworthy parts at an average labor rate of $60 per work hour. Required parts would be approximately $4,000 per helicopter. Based on these figures, the total cost impact of the AD is estimated to be $4,040 per helicopter. \n\n\tSince 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. \n\nComments Invited \n\tAlthough this action is in the form of a final rule that involves requirements affecting flight safety and, thus, was not preceded by notice and an opportunity for public comment, comments are invited on this rule. Interested persons are invited to comment on this rule by submitting such written data, views, or arguments as they may desire. Communications should identify the Rules Docket number and be submitted in triplicate to the address specified under the caption "ADDRESSES." All communications received on or before the closing date for comments will be considered, and this rule may be amended in light of the comments received. Factual information that supports the commenter's ideas and suggestions is extremely helpful in evaluating the effectiveness of the AD action and determining whether additional rulemaking action would be needed. \n\n\tComments are specifically invited on the overall regulatory, economic, environmental, and energy aspects of the rule that might suggest a need to modify the rule. All comments submitted will be available, both before and after the closing date for comments, in the Rules Docket for examination by interested persons. A report that summarizes each FAA-public contact concerned with the substance of this AD will be filed in the Rules Docket. \n\n\tCommenters wishing the FAA to acknowledge receipt of their comments submitted in response to this rule must submit a self-addressed, stamped postcard on which the following statement is made: "Comments to Docket No. 99-SW-09-AD." The postcard will be date stamped and returned to the commenter. \n\n\tThe regulations adopted herein will not have substantial direct effects on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government. Therefore, in accordance with Executive Order 12612, it is determined that this final rule does not have sufficient federalism implications to warrant the preparation of a Federalism Assessment. \n\n\tThe FAA has determined that notice and prior public comment are unnecessary in promulgating this regulation; and, 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. It 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 Rules Docket. A copy of it, if filed, may be obtained from the Rules Docket at the location provided under the caption "ADDRESSES." \n\nList of Subjects in 14 CFR Part 39 \n\tAir transportation, Aircraft, Aviation safety, Safety. \n\nAdoption of the Amendment \n\tAccordingly, 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: \n\nPART 39 - AIRWORTHINESS DIRECTIVES \n\t1. The authority citation for part 39 continues to read as follows: \n\tAuthority: 49 U.S.C. 106(g), 40113, 44701. \n\n§ 39.13 (Amended) \n\t2. Section 39.13 is amended by adding a new airworthiness directive (AD) to read as follows:

Submit comments in triplicate to the Federal Aviation Administration (FAA), Office of the Regional\nCounsel, Southwest Region, Attention: Rules Docket No. 99-SW-09-AD, 2601 Meacham Blvd, Room 663, Fort Worth,\nTexas. Comments may be inspected at this location between 9 a.m. and 3 p.m., Monday through Friday, except Federal\nholidays.

Mike Mathias, Aerospace Engineer, FAA, Rotorcraft Directorate,\nRotorcraft Standards Staff, Fort Worth, Texas 76193-0111, telephone (817) 222-5123, fax (817) 222-5961.