AD 2004-12-14

This amendment adopts a new airworthiness directive (AD), applicable to certain Dornier Model 328-100 series airplanes, that requires an inspection of the alternating current (AC) power cables, realignment of the AC power cable retaining clamp, and corrective actions if necessary. This action is necessary to prevent chafing of the AC power cables against the alternator, which could result in a short circuit and impaired performance of AC-powered components, possibly leading to loss of flight-critical information to the flight deck and reduced controllability of the airplane. This action is intended to address the identified unsafe condition.

Final rule.

2004-12-14 Fairchild Dornier GmbH (Formerly Dornier Luftfahrt GmbH): Amendment 39-13674. Docket 2003-NM-56-AD.

Applicability: Model 328-100 series airplanes, serial numbers 3005 through 3119 inclusive; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent chafing of the alternating current (AC) power cables against the alternator, which could result in a short circuit and impaired performance of AC-powered components, possibly leading to loss of flight-critical information to the flight deck and reduced controllability of the airplane, accomplish the following:

Corrective Actions

(a) Within 400 flight hours after the effective date of this AD, perform a general visual inspection of the AC power cables for damage due to chafing of the cables against the alternator, realign the cable retaining clamp, repair any damaged cables, install protective sleeving over the cables, and install cable ties; in accordancewith the Accomplishment Instructions of Dornier Service Bulletin SB-328-24-433, dated April 12, 2002.

Note 1: For the purposes of this AD, a general visual inspection is defined as: "A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to enhance visual access to all exposed surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or droplight and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked."

Alternative Methods of Compliance

(b) In accordance with 14 CFR 39.19, the Manager, International Branch, ANM-116, FAA, Transport Airplane Directorate, is authorized to approve alternativemethods of compliance for this AD.

Incorporation by Reference

(c) The actions shall be done in accordance with Dornier Service Bulletin SB-328-24-433, dated April 12, 2002. 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 AvCraft Aerospace GmbH, P.O. Box 1103, D-82230 Wessling, Germany. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call (202) 741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html .

Note 2: The subject of this AD is addressed in German airworthiness directive 2003-084, dated March 20, 2003.

Effective Date

(d) This amendment becomes effective on July 22, 2004.

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 Dornier Model 328-100 series airplanes was published in the Federal Register on April 1, 2004 (69 FR 17086). That action proposed to require an inspection of the alternating current (AC) power cables, realignment of the AC power cable retaining clamp, and corrective actions if necessary.

Comments

Interested persons have been afforded an opportunity to participate in the making of this amendment. No comments have been submitted on the proposed AD or on the determination of the cost to the public.

Conclusion

After careful review of the available data, the FAA has determined that air safety and the public interest require the adoption of the rule as proposed.

Cost Impact

We estimate that 53 airplanes of U.S. registry will be affected by this AD, that it will take approximately 3 workhours per airplane to accomplish the required actions, and that the average labor rate is $65 per work hour. Required parts will cost approximately $122 per airplane. Based on these figures, the cost impact of the AD on U.S. operators is estimated to be $16,801, or $317 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. 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.

Regulatory Impact

The regulations adopted herein will not have a substantial direct effect on the States, on the relationshipbetween 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.

39.13 [Amended]

2. Section 39.13 is amended by adding the following new airworthiness directive: