Costs of Compliance

We estimate that the AD affects 2,308 airplanes in the U.S. registry.

The costs vary from 3.5 workhours to incorporate Cirrus Kit 70186 004 and 2.5 workhours to incorporate Cirrus Kit 70186005. Parts cost for either kit is $270. For the purposes of this AD, we will use 3.5 workhours for all airplanes. Based on this, the cost of this AD is: Total cost Labor cost Parts per Total fleet cost airplane cost 3.5 workhours x $80 per hour = $280. $270 $550 $1,269,400

Note: CDC will provide warranty credit to the extent noted in CDC Service Bulletin 2X5207 R4, dated January 24, 2008.

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, Section 106 describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the agency's authority.

We are issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701, ``General requirements.'' Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this AD. Regulatory Findings

We have determined that this AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect 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.

For the reasons discussed above, I certify that this AD:

1. Is not a ``significant regulatory action'' under Executive Order 12866;

2. Is not a ``significant rule'' under the 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.

We prepared a summary of the costs to comply with this AD (and other information as included in the Regulatory Evaluation) and placed it in the AD Docket. You may get a copy of this summary by sending a request to us at the address listed under ADDRESSES. Include ``Docket No. FAA200728245; Directorate Identifier 2007CE047AD'' in your request.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
Adoption of the Amendment
Accordingly, under 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 39AIRWORTHINESS 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. FAA amends Sec. 39.13 by adding the following new AD:
20081413 Cirrus Design Corporation: Amendment 3915608; Docket No. FAA200728245; Directorate Identifier 2007CE047AD.
Effective Date
(a) This AD becomes effective on August 14, 2008.
Affected ADs
(b) None.
Applicability
(c) This AD applies to the following airplane models and serial numbers that are certificated in any category:
Models Serial Nos. SR20...................................... 1423 through 1906. SR22...................................... 0795 and 0820 through 2912. [[Page 39585]]
Unsafe Condition
(d) This AD results from two known occurrences of inflight cabin door separation (one total separation and one retained by the door strut). We are issuing this AD to prevent inflight failure of the cabin door, which could result in door separation from the airplane.
Compliance
(e) Unless already done, within the next 50 hours timein service (TIS) after August 14, 2008 (the effective date of this AD) or within 180 days after August 14, 2008 (the effective date of this AD), whichever occurs first, following Cirrus Design Corporation Service Bulletin SB 2X5207 R4, dated January 24, 2008, do one of the following:
(1) If threaded sleeve is installed at the cabin door rod end, install cabin door rod end Kit 70186004.
(2) If threaded sleeve is not installed at the cabin door rod end, install cabin door rod end Kit 70186005.
Alternative Methods of Compliance (AMOCs)
(f) The Manager, Chicago Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to

FOR FURTHER INFORMATION CONTACT Wess Rouse, Aerospace Engineer, Chicago Aircraft Certification Office (ACO), 2300 East Devon Avenue, Room 107, Des Plaines, Illinois 60018; telephone: (847) 2948113; fax: (847) 2947834.