[Federal Register Volume 59, Number 13 (Thursday, January 20, 1994)] [Unknown Section] [Page 0] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 94-1227] [[Page Unknown]] [Federal Register: January 20, 1994] ----------------------------------------------------------------------- DEPARTMENT OF TRANSPORTATION 14 CFR Part 39 [Docket No. 93-NM-177-AD; Amendment 39-8801; AD 93-21-04] Airworthiness Directives; Canadair Model CL-600-2B19 ``Regional Jet'' Series Airplanes AGENCY: Federal Aviation Administration, DOT. ACTION: Final rule; request for comments. ----------------------------------------------------------------------- SUMMARY: This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 93-21-04 that was sent previously to all known U.S. owners and operators of Canadair Model CL-600-2B19 ``Regional Jet'' series airplanes by individual letters. This AD requires repetitive lubrication with grease of the sliding shaft of the input plunger of the brake control valve assembly. This amendment is prompted by reports of temporary loss of braking action upon landing. The actions specified by this AD are intended to prevent temporary loss of braking action due to the freezing of moisture on the input plunger of the brake control valve during steep descent. DATES: Effective February 4, 1994 to all persons except those persons to whom it was made immediately effective by priority letter AD 93-21- 04, issued October 18, 1993, which contained the requirements of this amendment. The incorporation by reference of certain publications listed in the regulations is approved by the Director of the Federal Register as of February 4, 1994. Comments for inclusion in the Rules Docket must be received on or before March 21, 1994. ADDRESSES: Submit comments in triplicate to the Federal Aviation Administration (FAA), Transport Airplane Directorate, ANM-103, Attention: Rules Docket No. 93-NM-177-AD, 1601 Lind Avenue, SW., Renton, Washington 98055-4056. The applicable service information may be obtained from Bombardier, Inc., Bombardier Regional Aircraft Division, Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. This information may be examined at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Engine and Propeller Directorate, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. FOR FURTHER INFORMATION CONTACT: Danko Kramar, Aerospace Engineer, Systems and Equipment Branch, ANE-173, FAA, Engine and Propeller Directorate, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11582; telephone (516) 791- 6427; fax (516) 791-9024. SUPPLEMENTARY INFORMATION: On October 18, 1993, the FAA issued priority letter AD 93-21-04, applicable to Canadair Model CL-600-2B19 ``Regional Jet'' series airplanes. That action was prompted by notification from Transport Canada Aviation, which is the airworthiness authority for Canada, indicating that an unsafe condition may exist on certain of these airplanes. There had been two reports of temporary loss of braking action upon landing; in both cases, the braking action returned to normal within a few minutes after touchdown. Investigation revealed that the temporary loss of braking action was due to the freezing of moisture on the input plunger of the brake control valve during steep descent. This condition, if not corrected, could result in temporary loss of all braking action. Canadair issued Regional Jet Alert Service Bulletin S.B.A601R-32- 016, dated October 14, 1993, which describes procedures for lubricating the sliding shaft of the input plunger of the brake control valve assembly. Lubricating the input plunger will ensure that any moisture that has accumulated will not freeze on the plunger before the airplane is landed, thus ensuring that the brakes will function properly. Transport Canada Aviation classified this service bulletin as mandatory and issued Canadian Airworthiness Directive CF-93-26, dated October 15, 1993, in order to assure the continued airworthiness of these airplanes in Canada. This airplane model is manufactured in Canada and is type certificated for operation in the United States under the provisions of Section 21.29 of the Federal Aviation Regulations and the applicable bilateral airworthiness agreement. Pursuant to this bilateral airworthiness agreement, Transport Canada Aviation has kept the FAA informed of the situation described above. The FAA has examined the findings of Transport Canada Aviation, reviewed all available information, and determined that AD action is necessary for products of this type design that are certificated for operation in the United States. Since the unsafe condition described is likely to exist or develop on other airplanes of the same type design registered in the United States, the FAA issued priority letter AD 93-21-04 to prevent temporary loss of all braking action. The AD requires repetitive lubrication with grease of the sliding shaft of the input plunger of the brake control valve assembly. The actions are required to be accomplished in accordance with the service bulletin previously described. Since it was found that immediate corrective action was required, notice and opportunity for prior public comment thereon were impracticable and contrary to the public interest, and good cause existed to make the AD effective immediately by individual letters issued on October 18, 1993, to all known U.S. owners and operators of Canadair Model CL-600-2B19 ``Regional Jet'' series airplanes. These conditions still exist, and the AD is hereby published in the Federal Register as an amendment to section 39.13 of part 39 of the Federal Aviation Regulations (FAR) to make it effective as to all persons. Comments Invited Although this action is in the form of a final rule that involves requirements affecting flight safety and, thus, was not preceded by notice and an opportunity for public comment, comments are invited on this rule. Interested persons are invited to comment on this rule by submitting such written data, views, or arguments as they may desire. Communications shall identify the Rules Docket number and be submitted in triplicate to the address specified under the caption ADDRESSES. All communications received on or before the closing date for comments will be considered, and this rule may be amended in light of the comments received. Factual information that supports the commenter's ideas and suggestions is extremely helpful in evaluating the effectiveness of the AD action and determining whether additional rulemaking action would be needed. Comments are specifically invited on the overall regulatory, economic, environmental, and energy aspects of the rule that might suggest a need to modify the rule. All comments submitted will be available, both before and after the closing date for comments, in the Rules Docket for examination by interested persons. A report that summarizes each FAA-public contact concerned with the substance of this AD will be filed in the Rules Docket. Commenters wishing the FAA to acknowledge receipt of their comments submitted in response to this notice must submit a self-addressed, stamped postcard on which the following statement is made: ``Comments to Docket Number 93-NM-177-AD.'' The postcard will be date stamped and returned to the commenter. The regulations adopted herein will not have substantial direct effects 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. Therefore, in accordance with Executive Order 12612, it is determined that this final rule does not have sufficient federalism implications to warrant the preparation of a Federalism Assessment. The FAA has determined that this regulation is an emergency regulation that must be issued immediately to correct an unsafe condition in aircraft, and is not a ``significant regulatory action'' under Executive Order 12866. It has been determined further that this action involves an emergency regulation under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979). If it is determined that this emergency regulation otherwise would be significant under DOT Regulatory Policies and Procedures, a final regulatory evaluation will be prepared and placed in the Rules Docket. A copy of it, if filed, may be obtained from the Rules Docket at the location provided under the caption ADDRESSES. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. Adoption of the Amendment Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration amends 14 CFR part 39 of the Federal Aviation Regulations as follows: PART 39--AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. App. 1354(a), 1421 and 1423; 49 U.S.C. 106(g); and 14 CFR 11.89. Sec. 39.13 [Amended] 2. Section 39.13 is amended by adding the following new airworthiness directive: 93-21-04 Canadair: Amendment 39-8801. Docket No. 93-NM-177-AD. Applicability: Model CL-600-2B19 ``Regional Jet'' series airplanes; serial numbers 7003 and subsequent; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent temporary loss of all braking action, accomplish the following: (a) Within 3 days after the effective date of this AD, and thereafter at intervals not to exceed 3 days, lubricate with grease the sliding shaft of the input plunger of the brake control valve assembly in accordance with Canadair Regional Jet Alert Service Bulletin S.B.A601R-32-016, dated October 14, 1993. (b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, New York Aircraft Certification Office (ACO), FAA, Engine and Propeller Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, New York ACO. Note: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the New York ACO. (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (d) The lubrication procedure shall be done in accordance with Canadair Regional Jet Alert Service Bulletin S.B.A601R-32-016, dated October 14, 1993. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Bombardier, Inc., Bombardier Regional Aircraft Division, Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. This information may be examined at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Engine and Propeller Directorate, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effective on February 4, 1994, to all persons except those persons to whom it was made immediately effective by priority letter AD 93-21-04, issued October 18, 1993, which contained the requirements of this amendment. Issued in Renton, Washington, on January 12, 1994. John J. Hickey, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 94-1227 Filed 1-19-94; 8:45 am] BILLING CODE 4910-13-P