Federal Aviation Administration (FAA), Department of Transportation (DOT).
Notice of proposed rulemaking (NPRM).
We propose to adopt a new airworthiness directive (AD) for certain Cirrus Design Corporation (CDC) Model SR20 airplanes. This proposed AD would require an inspection and replacement as necessary of the heat exchanger. This proposed AD results from the discovery of engine exhaust fumes in the cabin of CDC Model SR20 airplanes. We are proposing this AD to detect and correct leaks in the exhaust system, which could result in exhaust gases leaking into the cabin heating system. This condition could lead to carbon monoxide in the cabin and incapacitation of the pilot.
We must receive comments on this proposed AD by May 12, 2008.
Use one of the following addresses to comment on this proposed AD:
- Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
- Fax: (202) 493-2251.
- Mail: U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room Start Printed Page 13158W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590.
- Hand Delivery: U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.
For service information identified in this proposed AD, contact Cirrus Design Corporation, 4515 Taylor Circle, Duluth, Minnesota 55811, telephone: (218) 788-3000.Start Further Info
FOR FURTHER INFORMATION CONTACT:
Michael Downs, Aerospace Engineer, 2300 East Devon Avenue, Room 107, Des Plaines, Illinois 60018; telephone: (847) 294-7870; fax: (847) 294-7834.End Further Info End Preamble Start Supplemental Information
We invite you to send any written relevant data, views, or arguments regarding this proposed AD. Send your comments to an address listed under the ADDRESSES section. Include the docket number, “FAA-2008-0284; Directorate Identifier 2008-CE-006-AD” at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the proposed AD. We will consider all comments received by the closing date and may amend the proposed AD in light of those comments.
We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive concerning this proposed AD.
We received a report from the operator of a fleet of CDC Model SR20 airplanes that an exhaust leak was discovered in the cabin on one of the fleet airplanes. Failure of a spot weld that secures the heater shroud to the muffler caused the exhaust leak. Inspection of the operator's total fleet of 40 airplanes found 24 more airplanes with defective spot welds. One of these defective welds was leaking exhaust into the cabin heating system.
This condition, if not corrected, could lead to carbon monoxide in the cabin and incapacitation of the pilot.
Relevant Service Information
We have reviewed Cirrus Service Bulletin SB 2X-78-07 R1, Revision 1, dated December 18, 2007. The service information describes procedures for:
- Pressurization check of the heat exchanger;
- Installation of an improved heat exchanger if broken welds or exhaust leaks are found; and
- Repetitive 100-hour pressurization checks.
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 an inspection and replacement as necessary of the exhaust system.
Costs of Compliance
We estimate that this proposed AD would affect 713 airplanes in the U.S. registry.
We estimate the following costs to do the proposed inspection:
|Labor cost||Parts cost||Total cost per airplane||Total cost on U.S. operators|
|1 work-hour × $80 per hour = $80||$0||$80||$57,040|
We estimate the following costs to do any necessary replacement that would be required based on the results of the proposed inspection. We have no way of determining the number of airplanes that may need this replacement:
|Labor cost||Parts cost||Total cost per airplane|
|1 work-hour × $80 per hour = $80||$848||$928|
Warranty credit will be given to the extent specified in Cirrus Service Bulletin SB 2X-78-07 R1, Revision 1, dated December 18, 2007.
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.
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 Start Printed Page 13159received, and other information on the Internet at http://www.regulations.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) 647-5527) is located at the street address stated in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt.Start List of Subjects
List of Subjects in 14 CFR Part 39End List of Subjects
The Proposed Amendment
Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:Start Part
PART 39—AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
2. The FAA amends § 39.13 by adding the following new AD:
Cirrus Design Corporation: Docket No. FAA-2008-0284; Directorate Identifier 2008-CE-006-AD.
Comments Due Date
(a) We must receive comments on this airworthiness directive (AD) action by May 12, 2008.
(c) This AD applies to Model SR20 airplanes, serial numbers 1005 through 1815, that are certificated in any category.
(d) This AD results from the discovery of engine exhaust fumes in the cabin of Cirrus Design Corporation Model SR20 airplanes. We are proposing this AD to detect and correct leaks in the exhaust system, which could result in exhaust gases leaking into the cabin heating system. This condition could lead to carbon monoxide in the cabin and incapacitation of the pilot.
(e) To address this problem, you must do the following, unless already done:
|(1) Perform a pressurization check on the exhaust system||Initially within the next 25 hours time-in-service (TIS) after the effective date of this AD or within the next 3 months after the effective date of this AD, whichever occurs first. Repetitively thereafter at intervals not to exceed every 100 hours TIS||Follow Cirrus Service Bulletin SB 2X-78-07 R1, Revision 1, dated December 18, 2007.|
|(2) If the exhaust system is found defective during any check required in paragraph (e)(1) of this AD or an exhaust odor is detected inside the airplane cabin, replace the heat exchanger weldment and shroud with new improved heat exchanger weldment and new shroud||Before further flight after the effective date of this AD||Follow Cirrus Service Bulletin SB 2X-78-07 R1, Revision 1, dated December 18, 2007.|
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 ATTN: Michael Downs, Aerospace Engineer, Chicago ACO, 2300 East Devon Avenue, Room 107, Des Plaines, Illinois 60018; telephone: (847) 294-7870; fax: (847) 294-7834. 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.
(g) To get copies of the service information referenced in this AD, contact Cirrus Design Corporation, 4515 Taylor Circle, Duluth, Minnesota 55811, telephone: (218) 788-3000. 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://www.regulations.gov.
Issued in Kansas City, Missouri, on March 4, 2008.
David R. Showers,
Acting Manager, Small Airplane Directorate, Aircraft Certification Service.
[FR Doc. E8-4864 Filed 3-11-08; 8:45 am]
BILLING CODE 4910-13-P