FAA's Determination and Requirements of the Proposed AD

We are proposing this AD because we evaluated all information and determined the unsafe condition described previously is likely to exist or develop on other products of the same type design. This proposed AD would require you to check the airplane logbook to determine if the original engine mounting brackets have been replaced. If the original engine mounting brackets are still installed, this proposed AD would require you to repetitively inspect those brackets for cracks and replace any cracked engine mounting bracket. After replacing all four original engine mounting brackets, no further action would be required by this proposed AD. This proposed AD would require you to use the service information described previously to perform these actions. Costs of Compliance

We estimate that this proposed AD would affect 1,218 airplanes in the U.S. registry.

We estimate the following costs to do each proposed inspection: Total cost per Total cost on Labor cost Parts cost airplane U.S. operators 7.5 workhours x $80 per hour = $600......... Not applicable................. $600 $730,800

We estimate the following costs to do the proposed replacements. Total cost per Labor cost Parts cost airplane 3 workhours per bracket x $80 $200 per bracket. $440 per bracket. per hour = $240 per bracket. 4 4 x $200 = $800 $1,760 to replace brackets per airplane x $240 for all 4 all 4 brackets. per bracket = $960. brackets.

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 rulemaking action.

Regulatory Findings

We have determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 the proposed regulation:

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 regulatory evaluation of the estimated costs to comply with this proposed AD and placed it in the AD docket. Examining the AD Docket

You may examine the AD docket that contains the proposed AD, the regulatory evaluation, any comments received, and other information on the Internet at http://dms.dot.gov; or in person at the Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Office (telephone (800) 6475527) is located at the street address stated in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Safety. The Proposed Amendment

Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 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. The FAA amends Sec. 39.13 by adding the following new AD: Cessna Aircraft Company: Docket No. FAA200729240; Directorate Identifier 2007CE076AD.
Comments Due Date
(a) We must receive comments on this airworthiness directive (AD) action by June 9, 2008.
Affected ADs
(b) None.
Applicability
(c) This AD applies to the following airplane models and serial numbers that are certificated in any category:
[[Page 19019]]
Model Serial Nos. Year manufactured (1) 175................................. 55001 through 55703............. 1958. (2) 175................................. 55704 through 56238............. 1959. (3) 175................................. 28700A, 626, and 640............ 1958 and 1959. (4) 175A................................ 691, and 56239 through 56777.... 1960. Unsafe Condition
(d) A report that the engine became unattached from the firewall during landing on one of the affected airplanes prompts this AD. We are issuing this AD to detect and correct cracks in the engine mounting brackets, which could result in failure of the engine mounting bracket. This failure could lead to the engine detaching from the firewall.
Compliance
(e) To address this problem, you must do the following, unless already done:
Actions Compliance Procedures (1) Check the airplane logbook to Within the next 30 days The owner/operator holding at least a determine if all four of the original after the effective date private pilot certificate as authorized engine mounting brackets have been of this AD. by section 43.7 of the Federal Aviation replaced. Regulations (14 CFR 43.7) may do this action. (2) If you can positively determine that Not applicable............. Make an entry into the aircraft logbook all four of the original engine mounting showing compliance with this portion of brackets have been replaced, no further the AD in accordance with section 43.9 action is required. of the Federal Aviation Regulations (14 CFR 43.9). The owner/operator holding at least a private pilot certificate as authorized by section 43.7 of the Federal Aviation Regulations (14 CFR 43.7) may do this action. (3) If you cannot positively determine Initially inspect within Follow Cessna Single Engine Service that all four of the original engine the next 12 months after Bulletin SEB072, Revision 2, dated mounting brackets have been replaced, the effective date of this June 18, 2007. inspect each of the upper and lower AD. If no cracks are engine mounting brackets on both the found, repetitively left and right sides for cracks as inspect thereafter at specified in the service bulletin. intervals not to exceed 500 hours timeinservice (TIS) until all four of the original engine mounting brackets are replaced.
(4) If cracks are found in any of the Before further flight after Follow Cessna Single Engine Service engine mounting brackets during any the inspection in which Bulletin SEB072, Revision 2, dated inspection required in paragraph (e)(3) cracks are found. June 18, 2007. of this AD, replace the cracked engine Replacing the cracked mounting bracket(s). engine mounting bracket terminates the repetitive inspection required in paragraph (e)(3) of this AD only for the replaced engine mounting bracket. (5) To terminate the repetitive At any time before or after Follow Cessna Single Engine Service inspections required in paragraph (e)(3) the initial inspection Bulletin SEB072, Revision 2, dated of this AD, you may replace all four required in paragraph June 18, 2007. original engine mounting brackets. (e)(3) of this AD. (6) Dispose of every replaced bracket Before further flight after Not applicable. following 14 CFR 43.10, paragraph the engine mounting (c)(6), which states the following: bracket is removed for ``Mutilation. The part may be mutilated replacement.
to deter its installation in a type
certificated product. The mutilation
must render the part beyond repair and
incapable of being reworked to appear to
be airworthy.''
Alternative Methods of Compliance (AMOCs)
(f) The Manager, Wichita 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 Gary Park, Aerospace Engineer, FAA, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Wichita, Kansas 67209; telephone: 3169464123; fax: 3169464107; e mail address: gary.park@faa.gov.