[Federal Register Volume 62, Number 174 (Tuesday, September 9, 1997)]
[Rules and Regulations]
[Pages 47359-47360]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 97-23465]



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 Rules and Regulations
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  Federal Register / Vol. 62, No. 174 / Tuesday, September 9, 1997 / 
Rules and Regulations  

[[Page 47359]]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 96-NM-271-AD; Amendment 39-10120; AD 97-18-10]
RIN 2120-AA64


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

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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SUMMARY: This amendment adopts a new airworthiness directive (AD), 
applicable to certain Bombardier Model CL-600-2B19 (Regional Jet Series 
100) airplanes that requires a one-time inspection of the direct 
current (DC) power distribution system for reliability, and correction 
or repair, of any fuse holders and associated electrical wiring, if 
necessary. This amendment is prompted by a report indicating that a 
loose fuse holder caused the DC power distribution system to short 
circuit on one of the affected airplanes, which resulted in a burnt 
wire between circuit breaker panel CBP-2 and junction box JB7. The 
actions specified by this AD are intended to prevent such short 
circuiting, which could result in a burnt wire, smoke entering the 
cockpit area, and consequent passenger injury due to smoke inhalation.

DATES: Effective October 14, 1997.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of October 14, 1997.

ADDRESSES: The service information referenced in this AD may be 
obtained from Bombardier, Inc., Canadair Aerospace Group, P.O. Box 
6087, Station Centre-ville, Quebec H3C 3G9, Canada. This information 
may be examined at the Federal Aviation Administration (FAA), Transport 
Airplane Directorate, Rules Docket, 1601 Lind Avenue, SW., Renton, 
Washington; or at the FAA, New York Aircraft Certification Office, 
Engine and Propeller Directorate, 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.

FOR FURTHER INFORMATION CONTACT: Balram Rambrich, Aerospace Engineer, 
Systems and Equipment Branch, ANE-172, FAA, Engine and Propeller 
Directorate, New York Aircraft Certification Office, 10 Fifth Street, 
Third Floor, Valley Stream, New York 11581; telephone (516) 256-7507; 
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-
2B19 (Regional Jet Series 100) airplanes was published in the Federal 
Register on June 4, 1997 (62 FR 30481). That action proposed to require 
a one-time inspection of the direct current (DC) power distribution 
system for reliability, and correction or repair, of any fuse holders 
and associated electrical wiring, if necessary.
    No comments were submitted in response to the proposal or the FAA's 
determination of the cost to the public.

Conclusion

    The FAA has determined that air safety and the public interest 
require the adoption of this rule as proposed.

Cost Impact

    The FAA estimates that 41 Bombardier Model CL-600-2B19 (Regional 
Jet Series 100) airplanes of U.S. registry will be affected by this AD, 
that it will take approximately 14 work hours per airplane to 
accomplish the required actions, and that the average labor rate is $60 
per work hour. Based on these figures, the cost impact of the AD on 
U.S. operators is estimated to be $34,440, or $840 per airplane.
    The cost impact figure discussed above is 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.

Regulatory Impact

    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.
    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:

97-18-10  Bombardier, Inc. (Formerly Canadair): Amendment 39-10120. 
Docket 96-NM-271-AD.

    Applicability: Model CL-600-2B19 (Regional Jet Series 100) 
airplanes, serial

[[Page 47360]]

numbers 7003 through 7105 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 (b) 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 the direct current (DC) power distribution system 
from short circuiting, which could result in a burnt wire, smoke 
entering the cockpit area, and consequent passenger injury due to 
smoke inhalation, accomplish the following:
    (a) Within 600 hours time-in-service after the effective date of 
this AD, perform a one-time inspection of the DC power distribution 
system for reliability in accordance with Canadair Regional Jet 
Alert Service Bulletin S.B. A601R-24-056, Revision `A,' dated July 
9, 1996. Prior to further flight, correct or repair any discrepant 
fuse holders and associated electrical wiring, in accordance with 
the service bulletin.
    (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 2: 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 
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.
    (d) The inspection shall be done in accordance with Canadair 
Regional Jet Alert Service Bulletin S.B. A601R-24-056, Revision `A,' 
dated July 9, 1996. 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, 
Quebec H3C 3G9, Canada. Copies may be inspected 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, 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.
    (e) This amendment becomes effective on October 14, 1997.

    Issued in Renton, Washington, on August 28, 1997.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 97-23465 Filed 9-8-97; 8:45 am]
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