Federal Register / Vol. 69, No. 198 / Thursday, October 14, 2004 / Notices 61067

FOR FURTHER INFORMATION CONTACT:

Emily A. White, Federal Aviation 

Administration, Flight Standards 

Service, AFS–50, 800 Independence 

Avenue, SW., Washington, DC 20591, 

by e-mail at emily.white@faa.gov, or 

telephone at (202) 385–8073. Printed 

copies can be obtained from U.S. 

Department of Transportation, 

Subsequent Distribution Office, 

Ardmore East Business Center, 3341 Q 

75th Avenue, Landover, MD 20785. The 

AC will also be available on the FAA’s 

Regulatory and Guidance Library Web 

site at http://www.airweb.faa.gov/rgl.

Issued in Washington, DC, on October 4, 

2004. 

John M. Allen, 

Deputy Director, Flight Standards Services.

[FR Doc. 04–23076 Filed 10–13–04; 8:45 am] 

BILLING CODE 4910–13–M

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration 

Advisory Circular (AC) 23.629–1B, 

Means of Compliance With Title 14 

CFR, Part 23, § 23.629, Flutter

AGENCY: Federal Aviation 

Administration, DOT.

ACTION: Notice of issuance of advisory 

circular. 

SUMMARY: This notice announces the 

issuance of Advisory Circular (AC) 

23.629–1B. This advisory circular 

presents information and guidance to 

provide one means, but not the only 

means of complying with § 23.629, 

Flutter (including divergence, and 

control reversal) of part 23 of the 

Federal Aviation Regulations. 

Accordingly, this material is neither 

mandatory nor regulatory in nature. 

The complexity of flutter analysis has 

historically prompted endeavors to find 

simplified methods of flutter 

substantiation. The advent of electronic 

computers has de-emphasized the need 

to make drastic assumptions previously 

necessary to enable mathematical 

treatment of the flutter phenomenon. 

However, there remains a need to 

simplify flutter solution as much as 

possible consistent with safety in order 

to minimize the cost and effort required 

to show freedom from flutter. Past 

experiences gained by the necessity to 

judiciously choose degrees of freedom, 

and by the need to make essential 

parametric studies has resulted in a 

generally recognized set of good 

practices. These good practices form the 

basis for this advisory circular. 

The draft advisory circular was issued 

for Public Comment on February 25, 

2004 (69 FR 8728). When possible, 

comments received were used to modify 

the draft advisory circular. 

We received some comments 

regarding the general layout of the 

advisory circular. We will consider 

reorganizing the content for the next 

revision. Any suggestions for the 

reorganization will be considered. For 

more information, or to make 

recommendations for the improvement 

of this advisory circular, contact Mark 

James, Standards Office, Small Airplane 

Directorate, Aircraft Certification 

Service, Kansas City, Missouri 64106, 

telephone (816) 329–4137, fax (816) 

329–4090, mark.james@faa.gov.

DATES: Advisory Circular (AC) 23–629–

1B was issued by the Manager, Small 

Airplane Directorate on September 28, 

2004. 

How to Obtain Copies: A paper copy 

of AC 23.629–1B may be obtained by 

writing to the U.S. Department of 

Transportation, Subsequent Distribution 

Office, DOT Warehouse, SVC–121.23, 

Ardmore East Business Center, 3341Q 

75th Avenue, Landover, MD 20785, 

telephone 301–322–5377, or by faxing 

your request to the warehouse at 301–

386–5394. The policy will also be 

available on the Internet at http://

www.airweb.faa.gov/AC.

Issued in Kansas City, Missouri, on 

September 28, 2004. 

Dorenda D. Baker, 

Manager, Small Airplane Directorate, Aircraft 

Certification Service.

[FR Doc. 04–23068 Filed 10–13–04; 8:45 am] 

BILLING CODE 4910–13–P

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration 

Advisory Circular 33.19–1, Guidance 

Material for 14 CFR § 33.19, Durability, 

for Reciprocating Engine Redesigned 

Parts

AGENCY: Federal Aviation 

Administration (FAA), DOT.

ACTION: Notice of issuance of advisory 

circular. 

SUMMARY: This advisory circular (AC) 

provides guidance and acceptable 

methods, but not the only methods, that 

may be used to demonstrate that 

redesigned parts for reciprocating 

engines comply with the requirements 

of § 33.19 of Title 14 of the Code of 

Federal Regulations (14 CFR). This AC 

addresses major type design changes, 

parts manufacturing approvals (PMA), 

and supplemental type certificates 

(STC) for drive system or structural 

parts in reciprocating engines.

DATES: The Engine and Propeller 

Directorate, Aircraft Certification 

Service, issued Advisory Circular 

33.19–1 on September 27, 2004.

FOR FURTHER INFORMATION CONTACT: The 

Federal Aviation Administration, Attn: 

Mark Rumizen, Engine and Propeller 

Standards Staff, ANE–110, 12 New 

England Executive Park, Burlington, MA 

01803–5299; telephone: (781) 238–7113; 

fax: (781) 238–7199; e-mail: 

Mark.Rumizen@faa.gov.

We have filed in the docket all 

substantive comments received, and a 

report summarizing them. If you wish to 

review the docket in person, you may go 

to the above address between 9 a.m. and 

5 p.m., Monday through Friday, except 

Federal holidays. If you wish to contact 

the above individual directly, you can 

use the above telephone number or email address provided. 

How To Obtain Copies: A paper copy 

of AC 33.19–1 may be obtained by 

writing to the U.S. Department of 

Transportation, Subsequent Distribution 

Office, DOT Warehouse, SVC–121.23, 

Ardmore East Business Center, 3341Q 

75th Ave., Landover, MD 20785, 

telephone 301–322–5377, or by

faxing your request to the warehouse

at 301–386–5394. The AC will also

be available on the Internet at

‘‘http://www.faa.gov/’’, select 

‘‘Regulations and Policies’’ and the link 

titled ‘‘Advisory Circulars’’.

(Authority: 49 U.S.C. 106(g), 40113, 44701–

44702, 44704.)

Issued in Burlington, Massachusetts, on 

September 27, 2004. 

Francis A. Favara, 

Acting Manager, Engine and Propeller 

Directorate, Aircraft Certification Service.

[FR Doc. 04–23073 Filed 10–13–04; 8:45 am] 

BILLING CODE 4910–13–M

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration 

Advisory Circular 33.27–1, Turbine 

Rotor Strength Requirements of 14 

CFR 33.27

AGENCY: Federal Aviation 

Administration (FAA), DOT.

ACTION: Notice of issuance of advisory 

circular. 

SUMMARY: This notice announces the 

issuance of Advisory Circular (AC) 

33.27–1, Turbine Rotor Strength 

Requirements of 14 CFR 33.27. This AC 

sets forth acceptable methods of 

compliance with the provisions of the 

rotor strength (overspeed) requirements 

of 14 CFR 33.27.