[Federal Register Volume 60, Number 92 (Friday, May 12, 1995)]
[Rules and Regulations]
[Pages 25608-25610]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-11355]



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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39

[Docket No. 94-NM-239-AD; Amendment 39-9223; AD 95-10-06]


Airworthiness Directives; Bombardier Model CL-600-1A11 (CL-600), 
-2A12 (CL-601), -2B16 (CL-601-3A, -3R), and -2B19 (Regional Jet Series 
100) Series Airplanes, Equipped with Sundstrand Air Driven Generator 
(ADG) Uplock Assembly

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-600-1A11, -2A12, -2B16, and -
2B19 series airplanes, that requires an inspection to verify the proper 
operation of the uplock latch of the air driven generator (ADG), and 
replacement of the uplock latch with a serviceable part, if necessary. 
This amendment also requires replacing the uplock assembly with a 
modified uplock assembly, and performing a rigging inspection. This 
amendment is prompted by a report indicating that, upon operation of 
the manual release system, the ADG did not deploy due to failure of the 
shaft pin. The actions specified by this AD are intended to prevent 
failure of the shaft pin, which could lead to the inability of the 
pilot to manually deploy the ADG when necessary (i.e., when an 
airplane's primary electrical power sources are lost and the ADG fails 
to deploy automatically).

DATES: Effective June 12, 1995.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of June 12, 1995.
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, 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.

FOR FURTHER INFORMATION CONTACT: Wing Chan, Electronics Engineer, 
Systems and Equipment Branch, ANE-173, FAA, Engine and Propeller 
Directorate, New York Aircraft Certification Office, 10 Fifth Street, 
Third Floor, Valley Stream, New York 11581; telephone (516) 256-7511; 
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, -2A12, -2B16, and -2B19 series airplanes was published in the 
Federal Register on February 17, 1995 (60 FR 9302). That action 
proposed to require a one-time inspection to verify the proper 
operation of the uplock latch of the air driven generator (ADG), and 
replacement of the uplock latch with a serviceable part if the uplock 
latch cannot be activated. That action also proposed to require 
replacing the uplock assembly with a modified uplock assembly, and 
performing a rigging inspection.
    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.
    The commenter supports the proposed rule. [[Page 25609]] 
    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 as proposed.
    The FAA estimates that 194 airplanes of U.S. registry will be 
affected by this AD, that it will take approximately 6 work hours per 
airplane to accomplish the required actions, and that the average labor 
rate is $60 per work hour. Required parts will be supplied by the 
manufacturer at no cost to the operators. Based on these figures, the 
total cost impact of the AD on U.S. operators is estimated to be 
$69,840, or $360 per airplane.
    The total 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.
    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. 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:

95-10-06  Bombardier Inc. (Formerly Canadair): Amendment 39-9223. 
Docket 94-NM-239-AD.

    Applicability: Model CL-600-1A11 (CL-600) series airplanes, 
serial numbers 1004 through 1085 inclusive; Model CL-600-2A12 (CL-
601) series airplanes, serial numbers 3001 through 3066 inclusive; 
Model CL-600-2B16 (CL-601-3A, -3R) series airplanes, serial numbers 
5001 through 5150 inclusive; Model CL-500-2B19 (Regional Jet Series 
100) series airplanes, serial numbers 7003 through 7040 inclusive; 
equipped with Sundstrand air driven generator (ADG) uplock assembly 
having part number 721863, 721863A, or 721863B; 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 use the authority 
provided in paragraph (c) to request approval from the FAA. This 
approval may address either no action, if the current configuration 
eliminates the unsafe condition; or different actions necessary to 
address the unsafe condition described in this AD. Such a request 
should include an assessment of the effect of the changed 
configuration on the unsafe condition addressed by this AD. In no 
case does the presence of any modification, alteration, or repair 
remove any airplane from the applicability of this AD.

    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent failure of the shaft pin, which could lead to the 
inability of the pilot to manually deploy the air driven generator 
(ADG) when necessary (i.e., when an airplane's primary electrical 
power sources are lost and the ADG fails to deploy automatically), 
accomplish the following:
    (a) For Model CL-600-2B19 (Regional Jet Series 100) series 
airplanes equipped with Sundstrand ADG uplock assembly having P/N 
721863B: Accomplish paragraphs (a)(1), (a)(2), and (a)(3) of this AD 
in accordance with Canadair Alert Service Bulletin S.B. A601R-24-
019, Revision `A', dated August 9, 1994.
    (1) Within 600 flight hours after the effective date of this AD, 
perform an inspection to verify the proper operation of the uplock 
latch of the ADG, in accordance with the Accomplishment Instructions 
of the service bulletin. If the uplock latch cannot be activated, 
prior to further flight, replace the uplock latch with a serviceable 
part in accordance with the alert service bulletin.
    (2) Within 12 months after the effective date of this AD, 
replace the uplock assembly with a modified uplock assembly, in 
accordance with the Accomplishment Instructions of the alert service 
bulletin.
    (3) After accomplishment of paragraph (a)(1) or (a)(2) of this 
AD, perform a rigging inspection in accordance with the 
Accomplishment Instructions of the service bulletin.
    (b) For Model CL-600-2A12, CL-2B16, and CL-600-1A11 series 
airplanes: Accomplish paragraphs (b)(1), (b)(2), and (b)(3) of this 
AD in accordance with Canadair Service Bulletin 600-0638, dated 
April 25, 1994 (for Model CL-600-1A11 series airplanes), or Canadair 
Service Bulletin 601-0430, dated April 25, 1994 (for Model CL-600-
2A12 and -2B15 series airplanes), as applicable.
    (1) Within 150 flight hours after the effective date of this AD, 
perform an inspection to verify the proper operation of the uplock 
latch of the ADG, in accordance with the Accomplishment Instructions 
of the applicable service bulletin. If the uplock latch cannot be 
activated, prior to further flight, replace the uplock latch with a 
serviceable part, in accordance with the applicable service 
bulletin.
    (2) Within 12 months after the effective date of this AD, 
replace the uplock assembly with a modified uplock assembly, in 
accordance with the Accomplishment Instructions of the applicable 
service bulletin.
    (3) After accomplishment of paragraph (b)(1) or (b)(2) of this 
AD, perform a rigging inspection in accordance with the 
Accomplishment Instructions of the applicable service bulletin.
    (c) 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.

    (d) Special flight permits may be issued in accordance with 
Secs. 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.
    (e) The actions shall be done in accordance with Canadair Alert 
Service Bulletin S.B. A601R-24-019, Revision `A', dated August 9, 
1994; Canadair Service Bulletin 600-0638, dated April 25, 1994; or 
Canadair Service Bulletin 601-0430, dated April 25, 1994; as 
applicable. 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 [[Page 25610]] 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.
    (f) This amendment becomes effective on June 12, 1995.

    Issued in Renton, Washington, on May 3, 1995.
James V. Devany,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 95-11355 Filed 5-11-95; 8:45 am]
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