Federal Register: February 15, 2005 (Volume 70, Number 30)

DOCID: FR Doc 05-2841

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

CFR Citation: 14 CFR Part 39

Docket ID: [Docket No. FAA-2005-20353; Directorate Identifier 2004-NM-255-AD]

RIN ID: RIN 2120-AA64

NOTICE: PROPOSED RULES

ACTION: Airworthiness directives:

DOCUMENT ACTION: Notice of proposed rulemaking (NPRM).

SUBJECT CATEGORY:

Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes

DATES: We must receive comments on this proposed AD by March 17, 2005.

DOCUMENT SUMMARY:

The FAA proposes to adopt a new airworthiness directive (AD) for certain Bombardier Model CL6002B19 (Regional Jet Series 100 & 440) airplanes. This proposed AD would require installing additional shielding of the hydraulic lines in the wing box area. This proposed AD is prompted by the determination that the additional hydraulic line shields will protect the lines from possible impact by tire debris if the tire tread fails. We are proposing this AD to prevent damage to the hydraulic lines and subsequent leakage from the two hydraulic systems, which could result in loss of braking capability on the affected side of the airplane, asymmetrical braking, and reduced directional controlparticularly during a rejected takeoff.

SUMMARY:

Bombardier,

SUPPLEMENTAL INFORMATION

Comments Invited

We invite you to submit any relevant written data, views, or arguments regarding this proposed AD. Send your comments to an address listed under ADDRESSES. Include ``Docket No. FAA200520353; Directorate Identifier 2004NM255AD'' 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 submitted 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://dms.dot.gov , including any personal information you provide. We will
also post a report summarizing each substantive verbal contact with FAA personnel concerning this proposed AD. Using the search function of our docket Web site, anyone can find and read the comments in any of our dockets, including the name of the individual who sent the comment (or signed the comment on behalf of an association, business, labor union, etc.). You can review the DOT's complete Privacy Act Statement in the Federal Register published on April 11, 2000 (65 FR 1947778), or you can visit http://dms.dot.gov. Examining the Docket

You can examine the AD docket on the Internet at http://dms.dot.gov , or in person at the Docket Management Facility office
between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Management Facility office (telephone (800) 647 5227) is located on the plaza level of the Nassif Building at the DOT street address stated in the ADDRESSES section. Comments will be available in the AD docket shortly after the DMS receives them. Discussion

Transport Canada Civil Aviation (TCCA), which is the airworthiness authority for Canada, notified us that an unsafe condition may exist on certain Bombardier Model CL6002B19 (Regional Jet Series 100 & 440) airplanes. TCCA advises that additional shielding of the hydraulic lines in the wing box area is necessary to protect the lines from possible impact by tire debris if the tire tread fails. If both lines have enough damage to cause leakage from the two hydraulic systems, braking capability on the affected side of the airplane would be lost, resulting in asymmetrical braking and reduced directional control particularly during a rejected takeoff.

Relevant Service Information

The manufacturer has issued Bombardier Service Bulletin 601R57 021, Revision ``C,'' dated February 23, 2004. The service bulletin describes procedures for installing additional hydraulic line shields to cover exposed hydraulic lines on both sides of the wing box area. The procedures also include replacing the left and right inboard brake lines with new lines to eliminate fouling of the lines with the shield. Accomplishing the actions specified in the service information is intended to adequately address the unsafe condition. TCCA mandated the service information and issued Canadian airworthiness directive CF 200420, dated October 5, 2004, to ensure the continued airworthiness of these airplanes in Canada.

FAA's Determination and Requirements of the Proposed AD

This airplane model is manufactured in Canada and is type certificated for operation in the United States under the provisions of Sec. 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and the applicable bilateral airworthiness agreement. Pursuant to this bilateral airworthiness agreement, TCCA has kept the FAA informed of the situation described above. We have examined TCCA's findings, evaluated all pertinent information, and determined that we need to issue an AD for products of this type design that are certificated for operation in the United States.

Therefore, we are proposing this AD, which would require accomplishing the actions specified in the service information described previously.

Costs of Compliance

The following table provides the estimated costs for U.S. operators to comply with this proposed AD.
Estimated Costs Number of U.S. Action Work hours Average labor Parts Cost per airplane registered Fleet cost rate per hour airplanes Shield installation................... 16 $65 $0 $1,040 91 $94,640 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 [[Page 7676]]
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. See the ADDRESSES section for a location to examine the regulatory evaluation.

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 airworthiness directive (AD):
Bombardier, Inc. (Formerly Canadair): Docket No. FAA200520353; Directorate Identifier 2004NM255AD.
Comments Due Date
(a) The Federal Aviation Administration must receive comments on this AD action by March 17, 2005.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Bombardier Model CL6002B19 (Regional Jet series 100 & 440) airplanes, certificated in any category, serial numbers 7003 through 7067 inclusive, 7069 through 7165 inclusive, 7167 through 7169 inclusive, and 7171 through 7188 inclusive.
Unsafe Condition
(d) This AD was prompted by the determination that additional shielding of the hydraulic lines in the wing box area will protect the lines from possible impact by tire debris if the tire tread fails. We are proposing this AD to prevent damage to the hydraulic lines and subsequent leakage from the two hydraulic systems, which could result in loss of braking capability on the affected side of the airplane, asymmetrical braking, and reduced directional controlparticularly during a rejected takeoff.
Compliance
(e) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Installation of Hydraulic Line Shields
(f) Within 24 months after the effective date of this AD, install additional shielding of the hydraulic lines in the wing box area, by doing all the actions specified in the Accomplishment Instructions of Bombardier Service Bulletin 601R57021, Revision `C,' dated February 23, 2004.
(g) We also consider the requirements of paragraph (f) of this AD to be met if the installation is done before the effective date of this AD in accordance with Bombardier Service Bulletin 601R57 021, Revision `B,' dated July 18, 2001.
Alternative Methods of Compliance (AMOCs)
(h) The Manager, New York Aircraft Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19.
Related Information
(i) Canadian airworthiness directive CF200420, dated October 5, 2004, also addresses the subject of this AD.

Issued in Renton, Washington, on February 6, 2005. Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification Service.
[FR Doc. 052841 Filed 21405; 8:45 am]
BILLING CODE 491013P

FOR FURTHER INFORMATION CONTACT

Daniel Parillo, Aerospace Engineer, Systems and Flight Test Branch, ANE172, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, suite 410, Westbury, New York 11590; telephone (516) 2287305; fax (516) 7945531.