[Federal Register Volume 65, Number 183 (Wednesday, September 20, 2000)]
[Rules and Regulations]
[Pages 56780-56783]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 00-23579]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 99-NM-26-AD; Amendment 39-11902; AD 2000-19-01]
RIN 2120-AA64


Airworthiness Directives; Bombardier Model CL-600-1A11 (CL-600) 
and CL-600-2A12 (CL-601) Series Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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SUMMARY: This amendment adopts a new airworthiness directive (AD), 
applicable to Bombardier Model CL-600-1A11 (CL-600) and CL-600-2A12 
(CL-601) series airplanes, that requires modification of the main 
landing gear (MLG) brake units and inboard MLG wheels; and a revision 
to the Airplane Flight Manual (AFM) to include the increased cooling 
times for the modified brakes. This amendment allows, for certain 
cases, removal of the inboard and/or outboard wheel discs by 
installation of a placard to limit airplane operation on the ground and 
a revision to the AFM to include information for operating the airplane 
with the wheel discs removed. Additionally, this amendment provides for 
an acceptable method of compliance that involves installation of a new 
revision to the AFM. This amendment is prompted by issuance of 
mandatory continuing airworthiness information by a foreign civil 
airworthiness authority. The actions specified by this AD are intended 
to prevent water freezing on the brake while the airplane is in flight 
due to water, slush, or snow from the runway entering into the brake 
assemblies during takeoff, and consequently, a tire burst during 
landing of the airplane.

DATES: Effective October 25, 2000.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of October 25, 2000.

ADDRESSES: The service information referenced in this AD may be 
obtained from Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 
6087, Station Centre-ville, Montreal, Quebec H3C 3G9, Canada. This 
information may be examined at the FAA, Transport Airplane Directorate, 
1601 Lind Avenue, SW., Renton, Washington; or at the FAA, New York 
Aircraft Certification Office, 10 Fifth Street, Third Floor, Valley 
Stream, New York;

[[Page 56781]]

or at the Office of the Federal Register, 800 North Capitol Street, 
NW., suite 700, Washington, DC.

FOR FURTHER INFORMATION CONTACT: James E. Delisio, Aerospace Engineer, 
Airframe and Propulsion Branch, ANE-171, FAA, New York Aircraft 
Certification Office, 10 Fifth Street, Third Floor, Valley Stream, New 
York 11581; telephone (516) 256-7521; fax (516) 568-2716.

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal 
Aviation Regulations (14 CFR part 39) to include an airworthiness 
directive (AD) that is applicable to certain Bombardier Model CL-600-
1A11 (CL-600) and CL-600-2A12 (CL-601) series airplanes was published 
in the Federal Register on March 31, 2000 (65 FR 17208). That action 
proposed to require modification of the main landing gear (MLG) brake 
units and inboard MLG wheels; and a revision to the Airplane Flight 
Manual (AFM) to include the increased cooling times for the modified 
brakes. That action also proposed to allow, for certain cases, removal 
of the inboard and/or outboard wheel discs by installation of a placard 
to limit airplane operation on the ground and a revision to the AFM to 
include information for operating the airplane with the wheel discs 
removed.

Comments

    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. Due consideration has been given to 
the single comment received.

Request to Withdraw the Proposal

    The commenter points out that the manufacturer has issued, and the 
FAA has approved, a revision of the AFM's for the applicable airplane 
models that contain procedures to dry out the brakes. [Bombardier Model 
CL-600-1A11 (CL-600) AFM Revisions A84 and 76, both dated February 7, 
2000; and Model CL600-2A12 (CL-601) AFM Revisions 45, 48, 50, and 86, 
all dated February 7, 2000.] The AFM revision for the applicable 
airplane models also contains procedures calling for a minimum number 
of brake applications during taxi prior to take-off when operating on 
wet, snow covered, or slush covered surfaces. The commenter concludes 
that the modification of the MLG units and inboard MLG wheels specified 
in the proposal is no longer necessary. The FAA infers that the 
commenter is requesting that the NPRM be withdrawn.
    The FAA does not concur that the NPRM should be withdrawn. Since an 
identified unsafe condition would still exist, the FAA would be 
obligated to proceed with another NPRM proposing that the new AFM 
revisions be mandated. The FAA finds that to delay this action would be 
inappropriate in light of the unsafe condition. However, the FAA 
acknowledges that the procedures described in the new AFM revisions do 
provide an acceptable level of safety for complying with the 
requirements of this AD. Therefore, the final rule has been revised to 
add a new paragraph (d) that provides for compliance with the 
requirements of this AD.

Conclusion

    After careful review of the available data, including the comment 
noted above, the FAA has determined that air safety and the public 
interest require the adoption of the rule with the changes previously 
described. The FAA has determined that these changes will neither 
increase the economic burden on any operator nor increase the scope of 
the AD.

Cost Impact

    The FAA estimates that 131 airplanes of U.S. registry will be 
affected by this AD.
    It will take approximately 33 work hours [for Model CL-600-1A11 
(CL-600) series airplanes] or 26 work hours [for Model CL-600-2A12 (CL-
601) series airplanes] per airplane to accomplish the required 
modification, at an average labor rate of $60 per work hour. Required 
parts will cost approximately $2,977 per airplane. Based on these 
figures, the cost impact of this action required by this AD on U.S. 
operators is estimated to be $649,367, or $4,957 per airplane [for 
Model CL-600-1A11 (CL-600) series airplanes], and $594,347, or $4,537 
per airplane [for Model CL-600-2A12 (CL-601) series airplanes].
    It will take approximately 1 work hour per airplane to accomplish 
the required AFM revision, at an average labor rate of $60 per work 
hour. Based on these figures, the cost impact of the AFM revision 
required by this AD on U.S. operators is estimated to be $7,860, or $60 
per airplane.
    The cost impact figures discussed above are based on assumptions 
that no operator has yet accomplished any of the requirements of this 
AD action, and that no operator would accomplish those actions in the 
future if this AD were not adopted. The cost impact figures discussed 
in AD rulemaking actions represent only the time necessary to perform 
the specific actions actually required by the AD. These figures 
typically do not include incidental costs, such as the time required to 
gain access and close up, planning time, or time necessitated by other 
administrative actions.
    In the event an operator chooses to install the new AFM revisions 
specified in paragraph (d) of this AD, it will take approximately 1 
work hour per airplane to accomplish, at an average labor rate of $60 
per work hour. Based on these figures, the cost impact of the AFM 
revision specified in paragraph (d) of this AD on U.S. operators is 
estimated to be $7,860, or $60 per airplane.

Regulatory Impact

    The regulations adopted herein 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. Therefore, it 
is determined that this final rule does not have federalism 
implications under Executive Order 13132.
    For the reasons discussed above, I certify that this action (1) is 
not a ``significant regulatory action'' under Executive Order 12866; 
(2) is not a ``significant rule'' under 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. A final evaluation has been prepared for this action 
and it is contained in the Rules Docket. A copy of it 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 part 39 of 
the Federal Aviation Regulations (14 CFR 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. Section 39.13 is amended by adding the following new 
airworthiness directive:


[[Page 56782]]


2000-19-01  Bombardier, Inc.  (Formerly Canadair): Amendment 39-
11902. Docket 99-NM-26-AD.

    Applicability: Model CL-600-1A11 (CL-600) series airplanes, 
serial numbers 1004 through 1066 inclusive and 1068 through 1085 
inclusive, and Model CL-600-2A12 (CL-601) series airplanes, serial 
numbers 3001 through 3050 inclusive; certificated in any category.

    Note 1: This AD applies to each airplane identified in the 
preceding applicability provision, regardless of whether it has been 
modified, altered, or repaired in the area subject to the 
requirements of this AD. For airplanes that have been modified, 
altered, or repaired so that the performance of the requirements of 
this AD is affected, the owner/operator must request approval for an 
alternative method of compliance in accordance with paragraph (e) of 
this AD. The request should include an assessment of the effect of 
the modification, alteration, or repair on the unsafe condition 
addressed by this AD; and, if the unsafe condition has not been 
eliminated, the request should include specific proposed actions to 
address it.

    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent water freezing on the brake while the airplane is in 
flight due to water, slush, or snow from the runway entering into 
the brake assemblies during takeoff, and consequently, a tire burst 
during landing of the airplane, accomplish the following:

Modification and AFM Revision

    (a) Except as required by paragraph (b) of this AD, within 300 
flight cycles after the effective date of this AD, accomplish the 
actions required by paragraphs (a)(1) and (a)(2) of this AD in 
accordance with the Accomplishment Instructions of Canadair 
Challenger Service Bulletin 600-0369, Revision 4, dated June 27, 
1984, including Attachment 1, dated December 6, 1983, and Attachment 
2, dated January 11, 1984 [for Model CL-600-1A11 (CL-600) series 
airplanes]; or 601-0024, Revision 3, dated November 27, 1984, 
including Attachment 1, dated June 21, 1984, Attachment 2, dated 
December 6, 1983, and Attachment 3, dated January 11, 1984 [for 
Model CL-600-2A12 (CL-601) series airplanes]; as applicable.
    (1) Modify the main landing gear (MLG) brake units and inboard 
MLG wheels.

    Note 2: Part A of the Accomplishment Instructions of Canadair 
Challenger Service Bulletin 600-0369, Revision 4, dated June 27, 
1984, including Attachment 1, dated December 6, 1983, and Attachment 
2, dated January 11, 1984; has been accomplished on airplane serial 
number 1072 in production.

    (2) Revise the Normal Procedures Section of the FAA-approved 
Airplane Flight Manual (AFM) to include the brake cooling times for 
the modification specified in paragraph (a)(1) of this AD. This AFM 
revision may be accomplished by inserting the applicable AFM 
revision listed in the applicable service bulletin listed in 
paragraph (a) of this AD. Subsequent AFM revisions may be inserted 
in the AFM provided that the brake cooling information is identical 
to the applicable AFM revision listed in the applicable service 
bulletin listed in paragraph (a) of this AD.
    (b) Operation of the airplane from contaminated runways (i.e., 
wet, snow covered, or slush covered surfaces) is prohibited until 
the actions required by paragraph (a) or (d) of this AD are 
accomplished.

Optional Placard Installation and AFM Revisions

    (c) For airplanes that do not operate from a wet runway where 
the ambient temperature is below 10 degrees Celsius: It is 
permissible to remove the inboard and/or outboard wheel discs upon 
accomplishment of the actions specified in paragraphs (c)(1) and 
(c)(2) of this AD, in accordance with Canadair Challenger Service 
Bulletin 600-0662, dated November 30, 1995 [for Model CL-600-1A11 
(CL-600) series airplanes]; or 601-0467, dated November 30, 1995 
[for Model CL-600-2A12 (CL-601) series airplanes]; as applicable. 
The placard and AFM revision required by paragraphs (c)(1) and 
(c)(2) of this AD may be removed upon reinstallation of the inboard 
and outboard wheel discs.
    (1) Install a placard on the instrument panel that states the 
following: ``WHEEL DISCS ARE REMOVED--REFER TO AFM FOR LIMITATIONS''
    (2) Revise the Limitations Section of the AFM to include 
information for operating the airplane with the wheel discs removed. 
This AFM revision may be accomplished by inserting the applicable 
AFM revision specified in the applicable service bulletin listed in 
paragraph (a) of this AD. Subsequent AFM revisions may be inserted 
in the AFM provided that the information for operating the airplane 
with the wheel discs removed is identical to the applicable AFM 
revision specified in the applicable service bulletin listed in 
paragraph (a) of this AD.

Acceptable Methods of Compliance

    (d) For all airplanes: Installation of the AFM revision 
specified in either paragraph (d)(1) or (d)(2) of this AD, as 
applicable, is acceptable for compliance with the requirements of 
paragraphs (a) and (b) of this AD, as applicable.
    (1) Bombardier Model CL-600-1A11 (CL-600) AFM Revisions A84 and 
76, both dated February 7, 2000; or
    (2) Bombardier Model CL600-2A12 (CL-601) AFM Revisions 45, 48, 
50, and 86, all dated February 7, 2000.

Alternative Methods of Compliance

    (e) 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. 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 3: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the New York ACO.

Special Flight Permits

    (f) Special flight permits may be issued in accordance with 
sections 21.197 and 21.199 of the Federal Aviation Regulations (14 
CFR 21.197 and 21.199) to operate the airplane to a location where 
the requirements of this AD can be accomplished.

Incorporation by Reference

    (g)(1) The actions required by paragraph (a) of this AD shall be 
done in accordance with Canadair Challenger Service Bulletin 601-
0024, Revision 3, dated November 27, 1984, including Attachment 1, 
dated June 21, 1984, Attachment 2, dated December 6, 1983, and 
Attachment 3, dated January 11, 1984; or Canadair Challenger Service 
Bulletin 600-0369, Revision 4, dated June 27,1984, including 
Attachment 1, dated December 6, 1983, and Attachment 2, dated 
January 11, 1984; as applicable. Revision 3 of Canadair Challenger 
Service Bulletin 601-0024 contains the list of effective pages 
specified in Table 1 of this AD. Revision 4 of Canadair Challenger 
Service Bulletin 600-0369 contains the list of effective pages 
specified in Table 2 of this AD. Tables 1 and 2 are as follows:

                                 Table 1
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                                    Revision level
           Page Number               shown on page    Date shown on page
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1-10............................  3.................  November 27, 1984.
1-13............................  Attachment 1, Rev.  June 21, 1984.
                                   1.
1, 2............................  Attachment 2......  December 6, 1983
1, 2............................  Attachment 3......  January 11, 1984.
------------------------------------------------------------------------


                                 Table 2
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                                    Revision level
           Page Number               shown on page    Date shown on page
------------------------------------------------------------------------
1-10............................  4.................  June 27, 1984.
1, 2............................  Attachment 1......  December 6, 1983.
1, 2............................  Attachment 2......  January 11, 1984.
------------------------------------------------------------------------

    (2) 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., Canadair, 
Aerospace Group, P.O. Box 6087, Station Centre-ville, Montreal, 
Quebec H3C 3G9, Canada. Copies may be inspected at the FAA, 
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, 
Washington; or at the FAA, New York Aircraft Certification Office, 
10 Fifth Street, Third Floor, Valley Stream, New York; or at the 
Office of the Federal Register, 800 North Capitol Street, NW., suite 
700, Washington, DC.

    Note 4: The subject of this AD is addressed in Canadian 
airworthiness directive CF-84-04R2, dated July 24, 1998.

    (h) This amendment becomes effective on October 20, 2000.


[[Page 56783]]


    Issued in Renton, Washington, on September 8, 2000.
Donald L. Riggin,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 00-23579 Filed 9-19-00; 8:45 am]
BILLING CODE 4910-13-P