[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]


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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.

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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