[Federal Register Volume 62, Number 244 (Friday, December 19, 1997)]
[Proposed Rules]
[Pages 66567-66569]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 97-33147]


-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 97-CE-109-AD]
RIN 2120-AA64


Airworthiness Directives; Alexander Schleicher Segelflugzeugbau 
Model ASK-21 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 certain Alexander Schleicher Segelflugzeugbau 
(Alexander Schleicher) Model ASK-21 sailplanes that do not have a 
certain automatic elevator connection installed. The proposed AD would 
require drilling a drainage hole in the elevator pushrod, inspecting 
the elevator pushrod for corrosion damage, and replacing any elevator 
pushrod if a certain amount of corrosion damage 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 prevent failure of the 
elevator pushrod caused by corrosion damage, which could result in loss 
of control of the sailplane.

DATES: Comments must be received on or before January 19, 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-109-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. 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

[[Page 66568]]

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-109-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-109-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 certain Alexander Schleicher Model ASK-21 sailplanes that do 
not have an automatic elevator connection installed in accordance with 
Alexander Schleicher Technical Note No. 11, dated December 20, 1983. 
The LBA reports several cases where the elevator pushrods are heavily 
corroded.
    This condition, if not corrected, could cause corrosion damage to 
the elevator pushrod and result in failure of the elevator pushrod with 
consequent loss of control of the sailplane.

Relevant Service Information

    Alexander Schleicher has issued Technical Note No. 26, dated July 
1, 1993, which specifies procedures for the following:
    --Drilling a drainage hole in the elevator pushrod; and
    --Inspecting the elevator pushrod for corrosion damage.
    The LBA classified this service bulletin as mandatory and issued 
German AD No. 93-186, dated September 15, 1993, 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 ASK-21 sailplanes 
of the same type design registered in the United States sailplanes that 
do not have a certain automatic elevator connection installed, the FAA 
is proposing AD action. The proposed AD would require drilling a 
drainage hole in the elevator pushrod, inspecting the elevator pushrod 
for corrosion damage, and replacing any elevator pushrod if a certain 
amount of corrosion damage is found. Accomplishment of the proposed 
installation would be in accordance with the service bulletin 
previously referenced.

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 elevator pushrod 
drainage hole drilling and elevator pushrod inspection, and that the 
average labor rate is approximately $60 an hour. Based on these 
figures, the total cost impact of the proposed AD on U.S. operators is 
estimated to be $1,800, or $60 per sailplane.

Compliance Time of the Proposed AD

    The unsafe condition specified by the proposed AD is caused by 
corrosion. Corrosion can occur regardless of whether the sailplane is 
in operation or is in storage. Therefore, to assure that the unsafe 
condition specified in the proposed AD does not go undetected for a 
long period of time, the compliance time is presented in calendar time 
instead of hours time-in-service (TIS).

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. 97-CE-109-AD.

    Applicability: Model ASK-21 sailplanes, serial numbers 21-001 
through 21-205, certificated in any category, that do not have an 
automatic elevator connection installed in accordance with Alexander 
Schleicher Technical Note No. 11, dated December 20, 1983.

    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,

[[Page 66569]]

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 as indicated in the body of this AD, unless 
already accomplished.
    To prevent failure of the elevator pushrod caused by corrosion 
damage, which could result in loss of control of the sailplane, 
accomplish the following:
    (a) Within the next 3 calendar months after the effective date 
of this AD, drill a drainage hole in the elevator pushrod in 
accordance with Alexander Schleicher Technical Note No. 26, dated 
July 1, 1993.
    (b) Within the next 3 calendar months after the effective date 
of this AD, inspect the elevator pushrod for corrosion damage in 
accordance with Alexander Schleicher Technical Note No. 26, dated 
July 1, 1993.
    (1) If no corrosion damage is found or corrosion damage is found 
that does not exceed the amount specified in the service bulletin, 
prior to further flight after the inspection required by paragraph 
(b) of this AD, apply a corrosion agent as described in the service 
bulletin.
    (2) If corrosion damage is found that exceeds the amount 
specified in the service bulletin, prior to further flight after the 
inspection required by paragraph (b) of this AD, replace the 
elevator pushrod in accordance with the maintenance manual, and 
apply a corrosion agent as described in the service bulletin.
    (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, 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.
    (e) Questions or technical information related to Alexander 
Schleicher Technical Note No. 26, dated July 1, 1993, 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.

    Note 3: The subject of this AD is addressed in German AD No. 93-
186, dated September 15, 1993.

    Issued in Kansas City, Missouri, on December 11, 1997.
Michael Gallagher,
Manager, Small Airplane Directorate, Aircraft Certification Service.
[FR Doc. 97-33147 Filed 12-18-97; 8:45 am]
BILLING CODE 4910-13-U