[Federal Register Volume 63, Number 24 (Thursday, February 5, 1998)]
[Proposed Rules]
[Pages 5904-5905]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-2780]



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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 97-CE-108-AD]
RIN 2120-AA64


Airworthiness Directives; Alexander Schleicher Model ASK-21 
Sailplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: This document proposes to adopt a new airworthiness directive 
(AD) that would apply to Alexander Schleicher Model ASK-21 sailplanes. 
The proposed action would require removing certain pages from the 
sailplane flight manual and replacing these pages with new pages having 
different information regarding spin and stall recovery. 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 prevent operators from 
using inaccurate stall and spin recovery information provided in the 
sailplane flight manual (SFM), which, if not corrected, could result in 
the inability to recover from a spin or stall during flight.

DATES: Comments must be received on or before March 3, 1998.

ADDRESSES: Submit comments in triplicate to the Federal Aviation 
Administration (FAA), Central Region, Office of the Regional Counsel, 
Attention: Rules Docket No. 97--CE-108--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, 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 
also may be examined at the Rules Docket at the address above.

FOR FURTHER INFORMATION CONTACT: 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) 426-6932; 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 filed in 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. 97--CE-108--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 FAA, Central Region, Office of the Regional Counsel, Attention: 
Rules Docket No. 97--CE-108--AD, Room 1558, 601 E. 12th Street, Kansas 
City, Missouri 64106.

Discussion

    The Luftfahrt-Bundesamt (LBA), which is the airworthiness authority 
for the Federal Republic of Germany, recently notified the FAA that an 
unsafe condition may exist on Alexander Schleicher Model ASK-21 
sailplanes. The LBA reports that the manufacturer's flight manual does 
not accurately document the stall and spin characteristics. The safety 
of the operator and the sailplane could be at risk when relying on the 
information contained in the SFM. The inaccuracy of the SFM, if not 
corrected, could result in the inability of the operator to recover 
from a stall or spin during flight.

Relevant Service Information

    Alexander Schleicher has issued Technical Note No. 23, dated 
January 29, 1991, which specifies procedures for removing SFM pages 2, 
22, 24, 33, and 34, and replacing these pages with new pages of the 
same numbers, but have a footnote ``TN 23 dated Jan 1991.''
    The LBA classified this service bulletin as mandatory and issued AD 
91-112 Schleicher, dated June 19, 1991, in order to assure the 
continued airworthiness of these sailplanes in Germany.

The FAA's Determination

    The Alexander Schleicher Model ASK-21 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 ASK-21 sailplanes 
of the same type design registered in the United States, the proposed 
AD would require removing certain pages from the Alexander Schleicher 
Model ASK-21 SFM, and replacing them with new pages of the same 
numbers, dated January, 1991. Accomplishment of the proposed SFM change 
would be in accordance with the Action section of Alexander Schleicher 
Technical Note No. 23, dated January, 1991.

Cost Impact

    The FAA estimates that 30 sailplanes in the U.S. registry would be 
affected by the proposed AD, that it would take approximately 1 
workhour per sailplane to accomplish the proposed action, and that the 
average labor rate is approximately $60 an hour. The SFM pages are 
provided by the manufacturer at no cost to the owner/operator. 
Inserting the pages into the SFM may be performed by the owner/operator 
holding at least a private pilot certificate as authorized by section 
43.7 of the

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Federal Aviation Regulations (14 CFR 43.7), and must be entered into 
the aircraft records showing compliance with this AD in accordance with 
section 43.9 of the Federal Aviation Regulations (14 CFR 43.9). Based 
on these figures, there is no cost impact of the proposed AD on U.S. 
owners/operators because the proposed action can be accomplished by the 
owner/operator.

Proposed Compliance Time

    The proposed action, the LBA AD, and the Alexander Schleicher 
Technical Note No. 23, dated January 29, 1991, differ on the compliance 
time. The LBA AD and the Technical Note require that the replacement of 
the SFM pages be accomplished at the next annual inspection.
    The FAA is proposing a calendar compliance time instead of the next 
annual inspection because the service history on the U.S.-registered 
Schleicher Model ASK-21 sailplane does not warrant a need for immediate 
compliance, and because each sailplane has a different time for the 
next annual inspection. The calendar compliance will ensure that all of 
the sailplanes have changed the flight manual and be aware of the new 
information at approximately the same time.

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: Docket No. 97-CE-108-AD.

    Applicability: Model ASK-21 sailplanes, serial numbers 21-001 
through 21-205, 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 3 calendar months after the 
effective date of this AD, unless already accomplished.
    To prevent operators from using inaccurate stall and spin 
recovery information provided in the sailplane flight manual (SFM), 
which, if not corrected, could result in the inability to recover 
from a spin or stall during flight, accomplish the following:
    (a) Remove pages 2, 22, 24, 33, and 34 from the Alexander 
Schleicher Model ASK-21 SFM, and replace these pages with new pages 
of the same numbers that have footnote ``TN 23 dated Jan 1991'', in 
accordance with Alexander Schleicher ASK 21 Technical Note No. 23, 
dated January 29, 1991.
    (b) Incorporating the SFM revisions, as required by this AD, may 
be performed by the owner/operator holding at least a private pilot 
certificate as authorized by section 43.7 of the Federal Aviation 
Regulations (14 CFR 43.7), and must be entered into the aircraft 
records showing compliance with this AD in accordance with section 
43.9 of the Federal Aviation Regulations (14 CFR 43.9).
    (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. 23, dated January 29, 1991, 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.

    Note 3: The subject of this AD is addressed in German AD No. 91-
112 Schleicher, dated June 19, 1991.

    Issued in Kansas City, Missouri, on January 29, 1998.
Terry L. Chasteen,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 98-2780 Filed 2-4-98; 8:45 am]
BILLING CODE 4910-13-U