AD 98-09-13 ACTIVE

This amendment adopts a new airworthiness directive (AD) that applies to certain Alexander Schleicher Segelflugzeugbau (Alexander Schleicher) Model ASK 21 sailplanes. This AD requires inspecting the S-shaped rudder pedal tube for displacement, and correcting any displacement of the plastic tube. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified by this AD are intended to prevent rudder control jamming, which could result in loss of directional control of the sailplane.

Final rule

98-09-13 ALEXANDER SCHLEICHER SEGELFLUGZEUGBAU: Amendment 39-10494; Docket No. 97-CE-104-AD.
Applicability: Model ASK 21 sailplanes, serial numbers 21001 through 21345, certificated in any category.
NOTE 1: This AD applies to each sailplane identified in the preceding applicability 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 (d) 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 within the next 6 calendar months after the effective date of this AD, unless already accomplished.

To prevent rudder control jamming, which could result in loss of directional control of the sailplane, accomplish the following:

(a) Inspect the plastic S-shaped rudder pedal tube for displacement in accordance with the Actions sections 1.1, 1.2, and 1.3 of Alexander Schleicher Technical Note No. 20, dated October 16, 1987.

(b) If there is any displacement of the plastic S-shaped rudder pedal tube, prior to further flight, correct the placement in accordance with the Actions sections 1.1, 1.2, and 1.3 of Alexander Schleicher Technical Note No. 20, dated October 16, 1987.

(c) 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.

(d) An alternative method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Small Airplane Directorate, Aircraft Certification Service, 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.

(e) Questions or technical information related to Alexander Schleicher Technical Note No. 20, dated October 16, 1987, should be directed to Alexander Schleicher, Segelflugzeugbau, 6416 Poppenhausen, Wasserkuppe, Federal Republic of Germany; telephone: 49.6658.890 or 49.6658.8920; facsimile: 49.6658.8923 or 49.6658.8940. 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.

(f) The inspection and correction required by this AD shall be done in accordance with Alexander Schleicher Technical Note No. 20, dated October 16, 1987. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Alexander Schleicher, Segelflugzeugbau, 6416 Poppenhausen, Wasserkuppe, Federal Republic of Germany. Copies may be inspected at the FAA, Central Region, Office of the Regional Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 800 North Capitol Street, NW, suite 700, Washington, DC.

NOTE 3: The subject of this AD is addressed in German AD No. 88-2 Schleicher, dated January 18, 1988.

(g) This amendment becomes effective on June 14, 1998.

Events Leading to the Issuance of This AD
A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to include an AD that would apply to certain Alexander Schleicher Model ASK 21 sailplanes was published in the Federal Register as a notice of proposed rulemaking (NPRM) on February 12, 1998 (63 FR 7082). The NPRM proposed to require inspecting the plastic S-shaped rudder pedal tube for displacement. If the rudder tube is displaced, the proposed action would require correcting the placement of the plastic S-shaped rudder pedal tube. Accomplishment of the proposed inspection would be in accordance with the Action sections 1.1, 1.2, and 1.3 of Alexander Schleicher Technical Note No. 20, dated October 16, 1987.

The NPRM was the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany.

Interested persons have been afforded an opportunity to participate in the making of this amendment. No comments were received on the proposed rule or the FAA's determination of the cost to the public.

The FAA's Determination
After careful review of all available information related to the subject presented above, the FAA has determined that air safety and the public interest require the adoption of the rule as proposed except for minor editorial corrections. The FAA has determined that these minor corrections will not change the meaning of the AD and will not add any additional burden upon the public than was already proposed.

Compliance Time of This AD
This action, the German AD, and Alexander Schleicher Technical Note No. 20, dated October 16, 1987, differ on compliance time. The German AD and the technical note require that the inspection for displacement of the plastic tube be accomplished prior to further flight.

The FAA is requiring a calendar compliance time instead of hours time-in-service (TIS) because the average monthly usage of the affectedsailplanes varies throughout the fleet. For example, one owner may operate the sailplane 25 hours TIS in one week, while another operator may operate the sailplane 25 hours TIS in one year. In order to ensure that all of the affected sailplanes have been inspected for displacement of the plastic S-shaped rudder tube and any displacement has been corrected within a reasonable amount of time, the FAA is requiring a compliance time of 6 calendar months.

Cost Impact
The FAA estimates that 30 sailplanes in the U.S. registry will be affected by this AD, that it will take approximately 2 workhours per sailplane to accomplish this action, and that the average labor rate is approximately $60 an hour. Parts cost approximately $5 (for glue) per sailplane. Based on these figures, the total cost impact of this AD on U.S. operators is estimated to be $3,750, or $125 per sailplane.

Regulatory Impact
The 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.

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) 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 final 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".

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.

39.13 [Amended]
2. Section 39.13 is amended by adding a new airworthiness directive (AD) to read as follows:

Service information that applies to this AD may be obtained from Alexander Schleicher, Segelflugzeugbau, 6416 Poppenhausen, Wasserkuppe, Federal Republic of Germany; telephone: 49.6658.890 or 49.6658.8920; facsimile: 49.6658.8923 or 49.6658.8940. This information may also be examined at the Federal Aviation Administration (FAA), Central Region, Office of the Regional Counsel, Attention: Rules Docket No. 97-CE-104-AD, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106; or at the Office of the Federal Register, 800 North Capitol Street, NW, suite 700, Washington, DC.

Mr. J. Mike Kiesov, Project Officer, Sailplanes/Gliders, Small Airplane Directorate, Aircraft Certification Service, FAA, 1201 Walnut, suite 900, Kansas City, Missouri 64106; telephone: (816) 426-6934; facsimile: (816) 426-2169.