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Proposed Rule

Airworthiness Directives; Eurocopter France Model AS350B, B1, B2, BA, and D Helicopters

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Federal Aviation Administration, DOT.


Notice of proposed rulemaking (NPRM).


This document proposes the adoption of a new airworthiness directive (AD) for specified Eurocopter France (Eurocopter) model helicopters. This proposal would require fireproofing the engine oil tank breather pipe (breather pipe) where it passes through the firewall from the engine compartment to the main gearbox compartment. This proposal is prompted by the discovery of a design deficiency that permitted the installation of a non-fireproof breather pipe. The actions specified by the proposed AD are intended to prevent the spread of fire between two designated fire zones of the helicopter, additional structural damage, and a decrease in the time available to execute an emergency landing.


Comments must be received on or before January 3, 2003.


Submit comments in triplicate to the Federal Aviation Administration (FAA), Office of the Regional Counsel, Southwest Region, Attention: Rules Docket No. 2002-SW-37-AD, 2601 Meacham Blvd., Room 663, Fort Worth, Texas 76137. You may also send comments electronically to the Rules Docket at the following address: Comments may be inspected at the Office of the Regional Counsel between 9 a.m. and 3 p.m., Monday through Friday, except Federal holidays.

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Ed Cuevas, Aviation Safety Engineer, FAA, Rotorcraft Directorate, Regulations Group, Fort Worth, Texas 76193-0111, telephone (817) 222-5355, fax (817) 222-5961.

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Comments Invited

Interested persons are invited to participate in the making of the proposed 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 above. All communications received on or before the closing date for comments, specified above, will be considered before taking action on the proposed rule. The proposals contained in this document may be changed in light of the comments received.

Comments are specifically invited on the overall regulatory, economic, environmental, and energy aspects of the proposed rule. All comments submitted will be available in the Rules Docket for examination by interested persons. A report summarizing each FAA-public contact concerned with the substance of this proposal will be filed in the Rules Docket.

Commenters wishing the FAA to acknowledge receipt of their mailed comments submitted in response to this document must submit a self-addressed, stamped postcard on which the following statement is made: “Comments to Docket No. 2002-SW-37-AD.” The postcard will be date stamped and returned to the commenter.


The Direction Generale De L'Aviation Civile (DGAC), the airworthiness authority for France, recently notified the FAA that an unsafe condition may exist on specified Eurocopter model helicopters. The DGAC advises that the breather pipe should be made fireproof by fitting it with a heat-resistant silicone sheath.

Eurocopter has issued AS 350 Service Bulletin No. 79.00.11, Revision No. 1, dated May 5, 2000, which specifies modifying the engine oil tank breather pipe with a high-temperature silicone glass sheath, then inspecting for oil leaks. The service bulletin states that it relates to MOD 072793. It further states that the high-temperature silicone glass sheath, part number (P/N) ASNAO 199-024, is included in modificatrion kit 350A0727930071. The DGAC classified this service bulletin as mandatory and issued AD No. 2000-268-078(A), dated June 28, 2000, to ensure the continued airworthiness of these helicopters in France.

These helicopter models are manufactured in France 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 this bilateral 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.

Since an unsafe condition has been identified that is likely to exist or develop on other specified Eurocopter model helicopters of these same type designs registered in the United States, the proposed AD would require modifying the breather pipe by installing a protection sheath on the segment of the engine oil tank breather pipe between the engine and the main gearbox compartments. The action would be required to be accomplished in accordance with the service bulletin described previously.

The FAA estimates that 470 helicopters of U.S. registry would be affected by this proposed AD, that it would take approximately 1 work hour per helicopter to accomplish the proposed actions, and that the average labor rate is $60 per work hour. Required parts would cost approximately $25 per helicopter. Based on these figures, the total cost impact of the proposed AD on U.S. operators is estimated to be $39,950.

The regulations proposed herein would not have a substantial direct effect 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, it is determined that this proposal would not have federalism implications under Executive Order 13132.

For the reasons discussed above, I certify that this proposed regulation (1) Start Printed Page 67132is not a “significant regulatory action” under Executive Order 12866; (2) is not a “significant rule” under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and (3) if promulgated, will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. A copy of the draft regulatory evaluation prepared for this action is contained in the Rules Docket. A copy of it may be obtained by contacting the Rules Docket at the location provided under the caption ADDRESSES.

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List of Subjects in 14 CFR Part 39

  • Air transportation
  • Aircraft
  • Aviation safety
  • Safety
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The Proposed Amendment

Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration proposes to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows:

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1. The authority citation for part 39 continues to read as follows:

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Authority: 49 U.S.C. 106(g), 40113, 44701.

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2. Section 39.13 is amended by adding a new airworthiness directive to read as follows:

Eurocopter France: Docket No. 2002-SW-37-AD.

Applicability: Eurocopter France Model AS350B, B1, B2, BA, and D helicopters, certificated in any category.

Note 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 (b) 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.

Compliance: Required before flight, unless accomplished previously.

To prevent a fire from spreading from the engine compartment through the firewall to the main gearbox due to a non-fireproof engine oil tank breather pipe (breather pipe), additional structural damage, and a decrease in the time available to execute an emergency landing, accomplish the following:

(a) Modify the engine oil tank breather pipe to make it fireproof by installing a high-terperature silicone glass protective sheath, part number ASNO199-024, in accordance with the Accomplishment Instructions, paragraph 2.A., in Eurocopter AS 350 Service Bulletin No. 79.00.11, Revision No. 1, dated May 5, 2000.

(b) An 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, Regulations Group, Rotorcraft Directorate, FAA. Operators shall submit their requests through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Regulations Group.

Note 2:

Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Regulations Group.

(c) Special flight permits may be issued in accordance with 14 CFR 21.197 and 21.199 to operate the helicopter to a location where the requirements of this AD can be accomplished.

Note 3:

The subject of this AD is addressed in Direction Generale De L'Aviation Civile (France) AD 2000-268-078(A), dated June 28, 2000.

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Issued in Fort Worth, Texas, on October 24, 2002.

David A. Downey,

Manager, Rotorcraft Directorate, Aircraft Certification Service.

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[FR Doc. 02-27789 Filed 11-1-02; 8:45 am]