AD 2008-05-09

The FAA adopts a new airworthiness directive (AD) for certain Cessna Aircraft Company (Cessna) 172, 182, and 206 series airplanes. This AD requires you to remove the crew seats, modify the seat base/ back attach brackets, and reinstall the seats of the affected airplanes. This AD results from reports of the seat base/back attach bracket failing where it is welded to the seat base. We are issuing this AD to prevent failure of the seat base/back attach brackets, which could result in the seats collapsing backwards during flight with consequent loss of control.

Final rule.

2008-05-09 Cessna Aircraft Company: Amendment 39-15403; Docket No. FAA-2007-28433; Directorate Identifier 2007-CE-052-AD.

Effective Date

(a) This AD becomes effective on April 8, 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 Numbers
(1) 172R
17281211 through 17281356
(2) 172S
172S9621 through 172S10310, 172S10312 through 172S10324, 172S10327 through 172S10332, 172S10334 through 172S10349, 172S10351 through 172S10374, 172S10376 through 172S10386, 172S10388 through 172S10408, 172S10410 through 172S10412, 172S10414 through 172S10417, and 172S10421 through 172S10423
(3) 182T
18281328 through 18281867, 18281869 through 18281871, 18281873 through 18281875, and 18281877
(4) T182T
T18208240 through T18208651, T18208654, T18208656 through T18208659, T18208663, T18208664, and T18208667 through T18208668
(5) 206H
20608216 through 20608283
(6) T206H
T20608445 through T20608662, T20608664 through T20608671, T20608673, T20608674, T20608676 through T20608681, T20608683 through T20608689, T20608691, T20608692, T20608694 through T20608696, T20608699 through T20608701, T20608703, and T20608704

Unsafe Condition

(d) This AD results from reports of the seat base/back attach bracket failing where it is welded to the seat base. We are issuing this AD to prevent failure of the seat base/back attach brackets, which could result in the seats collapsing backwards during flight with consequent loss of control.

Compliance

(e) To address this problem, you must do the following, unless already done:

Actions
Compliance
Procedures
Remove, modify, and reinstall the crew seats.
Within the next 50 hours time-in-service after April 8, 2008 (the effective date of this AD) or within the next 6 months after April 8, 2008 (the effective date of this AD), whichever occurs first.
Follow Cessna Aircraft Company Single Engine Modification Kit No. MK206-25-10, dated April 23, 2007, as specified in Cessna Aircraft Company Service Bulletin SB07-25-04, dated April 23, 2007.

Alternative Methods of Compliance (AMOCs)

(f) The Manager, Wichita Aircraft Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Gary Park, Aerospace Engineer, 1801 Airport Road, Room 100, Wichita, Kansas 67209; telephone: (316) 946-4123; fax: (316) 946-4107. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO.

Related Information

(g) To get copies of the service information referenced in this AD, contact Cessna Aircraft Company, Product Support, P.O. Box 7706, Wichita, Kansas 67277; telephone: (316) 517-5800; fax: (316) 942- 9006. To view the AD docket,go to U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590, or on the Internet at http://dms.dot.gov. The docket number is Docket No. FAA-2007-28433; Directorate Identifier 2007-CE-052-AD.

Material Incorporated by Reference

(h) You must use Cessna Aircraft Company Single Engine Modification Kit No. MK206-25-10, dated April 23, 2007, as specified in Cessna Aircraft Company Service Bulletin SB07-25-04, dated April 23, 2007, to do the actions required by this AD, unless the AD specifies otherwise.
(1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) For service information identified in this AD, contact Cessna Aircraft Company, Product Support, P.O. Box 7706, Wichita, Kansas 67277; telephone: (316) 517-5800; fax: (316) 942-9006.
(3) You may review copies at the FAA, CentralRegion, Office of the Regional Counsel, 901 Locust, Kansas City, Missouri 64106; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202- 741-6030, or go to: http://www.archives.gov/federal_register/code_ of_federal_regulations/ibr_locations.html.

Discussion

On July 12, 2007, we issued a proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to include an AD that would apply to certain Cessna Models 172, 182, and 206 airplanes. This proposal was published in the Federal Register as a notice of proposed rulemaking (NPRM) on July 19, 2007 (72 FR 39584). The NPRM proposed to remove the crew seats, modify the seat base/back attach brackets, and reinstall the seats of the affected airplanes and seats 3 and 4 on 206 series airplanes.

Comments

We provided the public the opportunity to participate in developing this AD. The following presents the comments received on the proposal and FAA's response to each comment:

Comment Issue No. 1: Number of Affected Airplanes

Jack Buster with the Modification and Replacement Part Association (MARPA) noted that the airworthiness concern sheet stated the proposed AD action affected 2,770 airplanes and the actual proposed ADstated the action affected 1,556 airplanes. He requests we clarify the number of the affected airplanes.
The FAA agrees that the numbers in the airworthiness concern sheet and the proposed AD differ. There are 2,770 airplanes worldwide but only 1,556 airplanes on the U.S. Registry. In the Cost of Compliance section of the AD preamble we state how many airplanes are listed on the U.S. Registry.
We will not change the final rule AD action as a result of this comment.

Comment Issue No. 2: Availability of Incorporated by Reference (IBR) Documents in the Docket Management System (DMS)

Jack Buster of MARPA requests IBR documents be available to the public by publication in the DMS.
The FAA has transitioned from the DMS to the government-wide Federal Docket Management System (FDMS). We are currently reviewing issues surrounding the posting of service bulletins in the FDMS as part of the AD docket. Once we have thoroughly examined all aspects of this issue and have made a final determination, we will consider whether our current practice needs to be revised.

Comment Issue No. 3: Exempting Non-crew Seats From This AD Action

The Aircraft Owners and Pilots Association requests that the FAA exempt non-crew seats from the AD action. Modification of the third and fourth seats on the Cessna Model 206 is estimated at just under $1,000 per aircraft and does not directly address the safety of flight issue proposed for this AD. The third and fourth seats are not crew seats and pose little to no risk that a seat collapse could cause the pilot to lose control of the airplane.
The FAA agrees that the modification of the third and fourth seats on the Cessna 206 does not directly address the safety of flight issue proposed for this AD.
We will change the final rule AD action as a result of this comment and not include seats 3 and 4 on 206 series airplanes.

Conclusion

We have carefully reviewed the available data and determined that air safety andthe public interest require adopting the AD as proposed except for minor editorial corrections. We have determined that these minor corrections:

Are consistent with the intent that was proposed in the NPRM for correcting the unsafe condition; and
do not add any additional burden upon the public than was already proposed in the NPRM.

Costs of Compliance

We estimate that this AD affects 1,556 airplanes in the U.S. registry.
We estimate the following costs to do the modification:

Labor Cost
Parts Cost
Total Cost Per Airplane
Total Cost on U.S. Operators
5 work-hours X $80 per hour = $400 (for two crew seats)
$800 (for two crew seats)
$1,200
$1,867,200

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. FAA-2007-28433; Directorate Identifier 2007-CE-052-AD'' 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 (14CFR 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.

Sec. 39.13 [Amended]

2. FAA amends Sec. 39.13 by adding a new AD to read as follows: