Airworthiness directives: Alexander Schleicher Segelflugzeugbau,

[Federal Register: January 5, 1999 (Volume 64, Number 2)]

[Proposed Rules]

[Page 445-447]

From the Federal Register Online via GPO Access [wais.access.gpo.gov]

[DOCID:fr05ja99-26]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 98-CE-98-AD]

RIN 2120-AA64

Airworthiness Directives; Alexander Schleicher Segelflugzeugbau Model ASH 26E Sailplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: This document proposes to adopt a new airworthiness directive (AD) that would apply to all Alexander Schleicher Segelflugzeugbau (Alexander Schleicher) Model ASH 26E sailplanes. The proposed AD would require inspecting the red silicone tube of the rotor interior air cooling (just in front of the carburetor) for oil leaks and the heat damping layer of the lower exhaust damper fairing for oil contamination, and replacing the applicable parts where oil leakage or contamination is found. The proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified by the proposed AD are intended to detect and correct any oil-contaminated exhaust damper fairing caused by oil leakage in the red silicone tube of the rotor interior air cooling, which could result in an exhaust fire and/or an explosion.

DATES: Comments must be received on or before February 11, 1999.

ADDRESSES: Submit comments in triplicate to the Federal Aviation Administration (FAA), Central Region, Office of the Regional Counsel, Attention: Rules Docket No. 98-CE-98-AD, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106. Comments may be inspected at this location between 8 a.m. and 4 p.m., Monday through Friday, holidays excepted.

Service information that applies to the proposed AD may be obtained from Alexander Schleicher GmbH & Co., Segelflugzeugbau, Postfach 60, 36163 Poppenhausen, Germany; telephone: ++49 (0) 6658-890; facsimile: ++49 (0) 6658-8923. This information also may be examined at the Rules Docket at the address above.

FOR FURTHER INFORMATION CONTACT: Mr. Mike Kiesov, Aerospace Engineer, FAA, Small Airplane Directorate, 1201 Walnut, suite 900, Kansas City, Missouri 64106; telephone: (816) 426-6932; facsimile: (816) 426-2169.

SUPPLEMENTARY INFORMATION:

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 notice 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, 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 proposal will be filedin the Rules Docket.

Commenters wishing the FAA to acknowledge receipt of their comments submitted in response to this notice must submit a self-addressed, stamped postcard on which the following statement is made: ``Comments to Docket No. 98-CE-98-AD.'' The postcard will be date stamped and returned to the commenter.

Availability of NPRMs

Any person may obtain a copy of this NPRM by submitting a request to the

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FAA, Central Region, Office of the Regional Counsel, Attention: Rules Docket No. 98-CE-98-AD, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106.

Discussion

The Luftfahrt-Bundesamt (LBA), which is the airworthiness authority for Germany, recently notified the FAA that an unsafe condition may exist on all Alexander Schleicher Model ASH 26E sailplanes. The LBA reports an incident where oil in the heat damping layer of the exhaust fairing caught fire. Investigation reveals the following possible causes of this incident:

--Oil was spilled when filling the engine oil tank; and

--Oil leakage could have occurred in the red silicone tube of the rotor interior air cooling (just in front of the carburetor).

This condition, if not detected and corrected in a timely manner, could result in an exhaust fire and/or an explosion.

Relevant Service Information

Alexander Schleicher has issued Technical Note No. 6, dated August 10, 1998, which specifies procedures for inspecting the red silicone tube of the rotor interior air cooling (just in front of the carburetor ) for oil leaks and the heat damping layer of the lower exhaust damper fairing for oil contamination.

The LBA classified this service bulletin as mandatory and issued German AD 98-347, dated September 10, 1998, in order to assure the continued airworthiness of these sailplanes in Germany.

The FAA's Determination

This sailplane model is manufactured in Germany 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 LBA has kept the FAA informed of the situation described above.

The FAA has examined the findings of the LBA; reviewed all available information, including the service information referenced above; and determined that AD action is necessary for products of this type design that are certificated for operation in the United States.

Explanation of the Provisions of the Proposed AD

Since an unsafe condition has been identified that is likely to exist or develop in other Alexander Schleicher Model ASH 26E sailplanes of the same type design registered in the United States, the FAA is proposing AD action. The proposed AD would require inspecting the red silicone tube of the rotor interior air cooling (just in front of the carburetor) for oil leaks and the heat damping layer of the lower exhaust damper fairing for oil contamination, and replacing the applicable parts where oil leakage or contamination is found.

Accomplishment of the proposed inspection would be required in accordance with Alexander Schleicher Technical Note No. 6, dated August 10, 1998. The possible replacements would be required to be accomplished in accordance with the applicable maintenance manual or other applicable FAA-approved document.

Compliance Time of the Proposed AD

This unsafe condition is not a result of the number of times the sailplane is operated. The chance of this situation occurring is the same for a sailplane with 10 hours time-in-service (TIS) as it would be for a sailplane with 500 hours TIS. For this reason, the FAA has determined that a compliance based on calendar time should be utilized in the proposed AD in order to assure that the unsafe condition is addressed on all sailplanes in a reasonable time period.

Differences Between the German AD, the Technical Note, and This Proposed AD

Both Alexander Schleicher Technical Note No. 6, dated August 10, 1998, and German AD 98-347, dated September 10, 1998, specify the initial inspection prior to further flight.

The FAA does not have justification through its regulatory process to require the inspection prior to further flight. To assure that no affected sailplane is inadvertently grounded, the FAA is proposing a compliance time of 1 calendar month for the initial inspection.

Cost Impact

The FAA estimates that 8 sailplanes in the U.S. registry would be affected by the proposed inspection, that it would take approximately 1 workhour per sailplane to accomplish the proposed inspection, and that the average labor rate is approximately $60 an hour. Based on these figures, the total cost impact of the proposed inspection on U.S. operators is estimated to be $480, or $60 per sailplane.

These figures only take into account the costs of the proposed inspection and do not take into account the costs associated with any parts replacement that would be necessary if oil leakage or contamination is found. The FAA has no way of determining the number of sailplanes that would need parts replacement because of oil leakage or contamination.

Regulatory Impact

The regulations proposed herein would 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 proposal would not have sufficient federalism implications to warrant the preparation of a Federalism Assessment.

For the reasons discussed above, I certify that this action (1) is not a ``significant regulatory action'' under Executive Order 12866; (2) is not a ``significant rule'' under 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 has been placed in the Rules Docket. A copy of it may be obtained by contacting the Rules Docket at the location provided under the caption ADDRESSES.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Safety.

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:

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 amended by adding a new airworthiness directive (AD) to read as follows:

   Alexander Schleicher Segelflugzeugbau: Docket No. 98-CE-98-AD.

   Applicability: Model ASH 26E sailplanes, all serial numbers, certificated in any category.

   Note 1: This AD applies to each sailplane identified in the preceding applicability

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   provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For sailplanes 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.

   Compliance: Required as indicated in the body of this AD, unless already accomplished.

   To detect and correct any oil-contaminated exhaust damper fairing caused by oil leakage in the red silicone tube of the rotor interior air cooling, which could result in an exhaust fire and/or an explosion, accomplish the following:

   (a) Within the next calendar month after the effective date of this AD, inspect the red silicone tube of the rotor interior air cooling (just in front of the carburetor) for oil leaks and the heat damping layer of the lower exhaust damper fairing for oil contamination, in accordance with the Action section of Alexander Schleicher Technical Note No. 6, dated August 10, 1998. Prior to further flight, replace the applicable parts where oil leakage or contamination is found, in accordance with the applicable maintenance manual or other applicable FAA-approved document.

   (b) Special 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 sailplane to a location where the requirements of this AD can be accomplished.

   (c) An alternative method of compliance or adjustment of the compliance times that provides an equivalent level of safety may be approved by the Manager, Small Airplane Directorate, FAA, 1201 Walnut, suite 900, Kansas City, Missouri 64106. The request shall be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Small Airplane Directorate.

   Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Small Airplane Directorate.

   (d) Questions or technical information related to Alexander Schleicher Technical Note No. 6, dated August 10, 1998, should be directed to Alexander Schleicher GmbH & Co., Segelflugzeugbau, Postfach 60, 36163 Poppenhausen, Germany; telephone: ++49 (0) 6658- 890; facsimile: ++49 (0) 6658-8923. This service information may be examined at the FAA, Central Region, Office of the Regional Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106.

   Note 3: The subject of this AD is addressed in German AD 98-347, dated September 10, 1998.

   Issued in Kansas City, Missouri, on December 29, 1998. Marvin R. Nuss, Acting Manager, Small Airplane Directorate, Aircraft Certification Service.

   [FR Doc. 99-42Filed1-4-99; 8:45 am]

   BILLING CODE 4910-13-U