30372 Federal Register / Vol. 63, No. 107 /Thursday, June 4, 1998 /Rules and Regulations

Instructions section in Pilatus PC–6 Service

Bulletin No. PC–6–SB–171, dated October 18,

1995.

(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 airplane to

a location where the requirements of this AD

can be accomplished.

(c) 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, 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 Pilatus Service Bulletin No. PC–6–

SB–171, dated October 18, 1995, should be

directed to Pilatus Aircraft Ltd., Customer

Liaison Manager, CH–6370 Stans,

Switzerland; telephone: +41 41–6196 233;

facsimile: +41 41–6103 351. 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.

(e) The modification required by this AD

shall be done in accordance with Pilatus

Service Bulletin No. PC–6–SB–171, dated

October 18, 1995. 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 Pilatus Aircraft Ltd., Customer

Liaison Manager, CH–6370 Stans,

Switzerland. 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 Swiss AD HB 95–451, dated November 1,

1995.

(f) This amendment becomes effective on

July 13, 1998.

Issued in Kansas City, Missouri, on May

22, 1998.

Michael Gallagher,

Manager, Small Airplane Directorate, Aircraft

Certification Service.

[FR Doc. 98–14607 Filed 6–3–98; 8:45 am]

BILLING CODE 4910–13–U

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 98–CE–09–AD; Amendment 39–

10561; AD 98–12–04]

RIN 2120–AA64

Airworthiness Directives; Glaser-Dirks

Flugzeugbau GmbH Model DG–500M

Gliders

AGENCY: Federal Aviation

Administration, DOT.

ACTION: Final rule.

SUMMARY: This amendment adopts a

new airworthiness directive (AD) that

applies to all Glaser-Dirks Flugzeugbau

GmbH (Glaser-Dirks) Model DG–500M

gliders. This AD requires installing a

rudder gap seal and modifying the

cooling liquid reservoir mount. 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

vibrations caused by flow separation at

the rudder gap, which could result in

flutter with consequent loss of rudder

control.

DATES: Effective July 21, 1998.

The incorporation by reference of

certain publications listed in the

regulations is approved by the Director

of the Federal Register as of July 21,

1998.

ADDRESSES: Service information that

applies to this AD may be obtained from

DG Flugzeugbau GmbH, Postfach 4120,

D–76625 Bruchsal 4, Germany;

telephone: +49 7257–89–0; facsimile:

+49 7257–8922. This information may

also be examined at the Federal

Aviation Administration (FAA), Central

Region, Office of the Regional Counsel,

Attention: Rules Docket No. 98–CE–09–

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.

FOR FURTHER INFORMATION CONTACT: Mr.

Mike Kiesov, Aerospace Engineer, Small

Airplane Directorate, Aircraft

Certification Service, FAA, 1201

Walnut, suite 900, Kansas City, Missouri

64106; telephone: (816) 426–6934;

facsimile: (816) 426–2169.

SUPPLEMENTARY INFORMATION:

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 all Glaser-Dirks Model DG–

500M gliders was published in the

Federal Register as a notice of proposed

rulemaking (NPRM) on March 20, 1998

(63 FR 13581). The NPRM proposed to

require installing a rudder gap seal and

modifying the cooling liquid reservoir

mount. Accomplishment of the

proposed installation as specified in the

NPRM would be required in accordance

with the maintenance manual.

Accomplishment of the proposed

modification to the cooling liquid

reservoir mount as specified in the

NPRM would be required in accordance

with Glaser-Dirks Working Instruction

No. 1 for TN 843/5, dated November 5,

1992, as referenced in Glaser-Dirks TN

No. 843/5, dated November 30, 1992.

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

Although the rudder vibrations

identified in this AD occur during flight,

this unsafe condition is not a result of

the number of times the glider is

operated. The chance of this situation

occurring is the same for a glider with

10 hours time-in-service (TIS) as it is for

a glider with 500 hours TIS. For this

reason, the FAA has determined that a

compliance based on calendar time

should be utilized in this AD in order

to assure that the unsafe condition is

addressed on all gliders in a reasonable

time period.

Cost Impact

The FAA estimates that 5 gliders in

the U.S. registry will be affected by this

AD, that it will take approximately 4

workhours per glider to accomplish this

action, and that the average labor rate is

approximately $60 an hour. Parts cost

approximately $40 per glider. Based on

these figures, the total cost impact of
Federal Register / Vol. 63, No. 107 /Thursday, June 4, 1998 /Rules and Regulations 30373

this AD on U.S. operators is estimated

to be $1,400, or $280 per glider.

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:

98–12–04 Glaser-Dirks Flugzeugbau GmbH:

Amendment 39–10561; Docket No. 98–

CE–09–AD.

Applicability: Model DG–500M gliders, all

serial numbers, certificated in any category.

Note 1: This AD applies to each glider

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

gliders 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 rudder vibrations caused by

flow separation at the rudder gap, which

could result in flutter with consequent loss

of rudder control, accomplish the following:

(a) Install a rudder gap seal in accordance

with the instructions in the maintenance

manual, as referenced in Glaser-Dirks

Technical Note (TN) No. 843/5, dated

November 30, 1992.

(b) Modify the cooling liquid reservoir

mount in accordance with Glaser-Dirks

Working Instruction No. 1 for TN 843/5,

dated November 5, 1992, as referenced in

Glaser-Dirks TN No. 843/5, dated November

30, 1992.

(c) Special flight permits may be issued in

accordance with §§ 21.197 and 21.199 of the

Federal Aviation Regulations (14 CFR 21.197

and 21.199) to operate the glider 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 Glaser-Dirks Technical Note No.

843/5, dated November 30, 1992, should be

directed to DG Flugzeugbau GmbH, Postfach

4120, D–76625 Bruchsal 4, Germany;

telephone: +49 7257–89–0; facsimile: +49

7257–8922. 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 modification required by this AD

shall be done in accordance with GlaserDirks Working Instruction No. 1 for

Technical Note 843/5, dated November 5,

1992, as referenced in Glaser-Dirks Technical

Note No. 843/5, dated November 30, 1992.

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 DG Flugzeugbau GmbH, Postfach 4120,

D–76625 Bruchsal 4, 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 93–010, dated January 5, 1993.

(g) This amendment becomes effective on

July 21, 1998.

Issued in Kansas City, Missouri, on May

26, 1998.

Michael Gallagher,

Manager, Small Airplane Directorate, Aircraft

Certification Service.

[FR Doc. 98–14618 Filed 6–3–98; 8:45 am]

BILLING CODE 4910–13–U

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 97–CE–102–AD; Amendment

39–10560; AD 98–12–03]

RIN 2120–AA64

Airworthiness Directives; Alexander

Schleicher Segelflugzeugbau Models

ASW–19 and ASK 21 Sailplanes

AGENCY: Federal Aviation

Administration, DOT.

ACTION: Final rule.

SUMMARY: This amendment adopts a

new airworthiness directive (AD) that

applies to certain Alexander Schleicher

Segelflugzeugbau (Alexander

Schleicher) Models ASW–19 and ASK

21 sailplanes. This AD requires:

modifying the rudder surface panels;

replacing the airbrake bellcrank; and

modifying the rear canopy hinge

structure. 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 loss of the canopy

caused by design deficiency, airbrake

failure caused by cracking, and rudder

panel flutter caused by high density

altitude conditions, all of which could

result in reduced sailplane

controllability.

DATES: Effective July 14, 1998.

The incorporation by reference of

certain publications listed in the

regulations is approved by the Director

of the Federal Register as of July 14,

1998.

ADDRESSES: 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