AD 95-10-06

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).

Final rule

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-600-2B19 (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 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.

(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 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.

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.

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.

39.13 - [Amended]
2. Section 39.13 is amended by adding the following new airworthiness directive: