[Federal Register Volume 69, Number 203 (Thursday, October 21, 2004)]
[Notices]
[Pages 61899-61900]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 04-23547]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration


Advisory Circular (AC) 23-21, Airworthiness Compliance Checklists 
Used to Substantiate Major Alterations for Small Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of issuance of advisory circular.

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SUMMARY: This notice announces the issuance of Advisory Circular (AC) 
23-21. This advisory circular provides guidance material for the 
creation and use of airworthiness compliance checklists that can be 
used when making major alteration to small airplanes. These checklists 
may be used by Airframe and Powerplant (A&P) mechanics with Inspection 
Authorization (IA) and by Federal Aviation Administration (FAA) 
Airworthiness Safety Inspectors (ASIs). The checklists identify the 
data requirements and their approval methods for several common major

[[Page 61900]]

alterations and identify the supporting documentation that may be used 
to support approval for return to service after aircraft alteration. 
Use of these airworthiness compliance checklists should be limited to 
alterations that have been determined to be ``major'' alterations, as 
defined in 14 CFR, part 1. They should not be used for complex 
alterations that require a Supplemental Type Certificate (STC), per FAA 
Order 8300.10. This advisory circular is intended to work in 
conjunction with and complement AC 43-210, Standardized Procedures for 
Requesting Field Approval of Data, Major Alterations, and Repairs. This 
advisory circular does not change any previously released FAA guidance 
material such as FAA Orders and AC's listed in section 4 of this 
advisory circular. The intent of this advisory circular is to provide a 
tool to work within existing approval processes. Material in this 
advisory circular is neither mandatory nor regulatory in nature and 
does not constitute a regulation. The use of these checklists during 
the return to service of a major alteration is not mandatory nor does 
it alter any previously acceptable method. The draft advisory circular 
was issued for Public Comment on May 28, 2004 (69 FR 30738). There were 
no comments received for the draft advisory circular.

DATES: Advisory Circular (AC) 23-21 was issued by the Manager, Small 
Airplane Directorate on September 30, 2004.
    How to Obtain Copies: A paper copy of AC 23-21 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 30, 2004.
David R. Showers,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 04-23547 Filed 10-20-04; 8:45 am]
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