Airworthiness Directives; Canadair Model CL-600-2B16 (CL-601-3A) Series Airplanes

DEPARTMENT OF TRANSPORTATION

14 CFR Part 39

[Docket No. 93-NM-222-AD; Amendment 39-8960 AD 94-14-08]

Airworthiness Directives; Canadair Model CL-600-2B16 (CL-601-3A)

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 certain Canadair Model CL-600-2B16 series airplanes, that

requires inspection to detect chafing of the wiring harness of the air

driven generator (ADG), modification of the wiring harness, and repair

of any chafed harness. This amendment is prompted by a report that the

wiring harness on certain airplanes was produced in a configuration

that is subject to chafing and electrical shorting. The actions

specified by this AD are intended to prevent chafing or shorting of the

wiring harness, which could result in loss of ADG power to the

essential bus when the ADG is deployed during an emergency situation.

DATES: Effective August 10, 1994.

The incorporation by reference of certain publications listed in

the regulations is approved by the Director of the Federal Register as

of August 10, 1994.

ADDRESSES: The service information referenced in this AD may be

obtained from Bombardier, Inc., Canadair, Aerospace Group, P.O. Box

6087, Station A, Montreal, 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, 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: Michele Maurer, 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 11581; telephone (516) 791-

6427; fax (516) 791-9024.

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 Canadair Model CL-600-2B16

series airplanes was published in the Federal Register on March 14,

1994 (59 FR 11735). That action proposed to require inspection to

detect chafing and modification of the wiring harness of the air driven

generator (ADG), and repair of any chafed harness.

Interested persons have been afforded an opportunity to participate

in the making of this amendment. No comments were submitted in response

to the proposal or the FAA's determination of the cost to the public.

The FAA has determined that air safety and the public interest require

the adoption of the rule as proposed.

The FAA estimates that 25 airplanes of U.S. registry will be

affected by this AD, that it will take approximately 1 work hour per

airplane to accomplish the required actions, and that the average labor

rate is $55 per work hour. Based on these figures, the total cost

impact of the AD on U.S. operators is estimated to be $1,375, or $55

per airplane.

The FAA estimates that it will take approximately 9 work hours per

airplane to accomplish the modification and the average labor rate is

$55 per work hour. Required parts will cost approximately $199 per

airplane. Based on these figures, the total cost impact of the

modification on U.S. operators is estimated to be $17,350, or $694 per

airplane.

Based on the figures, above, the total (inspection plus

modification) cost impact of the AD on U.S. operators is estimated to

be $18,725, or $749 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:

94-14-08 Canadair: Amendment 39-8960. Docket 93-NM-222-AD.

Applicability: Model CL-600-2B16 series airplanes having serial

numbers 5099 through 5131, inclusive; certificated in any category.

Note 1: Airplanes having serial numbers 5001 through 5098,

inclusive, are subject to the requirements of AD 91-19-01, amendment

39-8026 (which is similar in content to this amendment).

Compliance: Required as indicated, unless accomplished

previously.

To prevent loss of emergency power to the essential bus when the

air driven generator (ADG) is deployed, accomplish the following:

(a) Within 25 hours time-in-service after the effective date of

this AD, inspect to detect chafing of the wiring harness of the ADG

in accordance with Canadair Alert Service Bulletin A601-0370,

Revision 1, dated April 15, 1993. If chafing is found, prior to

further flight, repair in accordance with the service bulletin.

(b) Within 60 days after the effective date of this AD, modify

the harness installation of the ADG in accordance with Canadair

Alert Service Bulletin A601-0370, Revision 1, dated April 15, 1993.

(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 inspection and modification shall be done in accordance

with Canadair Alert Service Bulletin A601-0370, Revision 1, dated

April 15, 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.,

Canadair, Aerospace Group, P.O. Box 6087, Station A, 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, 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.

(f) This amendment becomes effective on August 10, 1994.

Issued in Renton, Washington, on June 23, 1994.

S.R. Miller,

Acting Manager, Transport Airplane Directorate, Aircraft Certification

Service.

[FR Doc. 94-15732 Filed 7-8-94; 8:45 am]

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