AD 2001-17-23

This amendment adopts a new airworthiness directive (AD), applicable to certain Bombardier Model DHC-8-100, -200, and -300 series airplanes, that requires a one-time detailed visual inspection to detect damage of the ladder plates and access cover areas of the upper surface of the wings; repair, if necessary; and installation of new O-ring seals. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent damage of the upper wing ladder plates, which could result in displacement of the adjacent channel seals and consequent reduced lightning strike protection of the fuel tanks.

Final rule.

2001-17-23 Bombardier, Inc. (Formerly de Havilland, Inc.): Amendment 39-12414. Docket 99-NM-371-AD.

Applicability: Model DHC-8-100, -200, and -300 series airplanes, having serial numbers 003 through 528 inclusive and 531; 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 damage of the upper wing ladder plates, which could result in displacement of the adjacent channel seals and consequent reduced lightning strike protection of the fuel tanks, accomplish the following:

Inspection and Repair

(a) Within 9 months or at the next maintenance period during which the fuel tanks are accessed after the effective date of this AD, whichever occurs earlier: Perform a one-time detailed visual inspection to detect damage (i.e., fretting and/or corrosion) of the ladder plates and access cover areas of the upper surface of the wings per paragraph III.A., III.B., or III.C., as applicable, of the Accomplishment Instructions of Bombardier Service Bulletin 8-57-41, Revision "C", dated August 4, 2000.

Note 2: For the purposes of this AD, a detailed visual inspection is defined as: "An intensive visual examination of a specific structural area, system, installation, or assembly todetect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc. may be used. Surface cleaning and elaborate access procedures may be required."

(1) If no damage is detected, prior to further flight, install new 0.103-inch-diameter O-ring seals per paragraph III.A., III.B., or III.C., as applicable, of the Accomplishment Instructions of the service bulletin.

(2) If any damage is detected that is within the limits specified in de Havilland Dash 8 Generic Structural Repair Schemes Manual PSM 1-8-3RS or PSM 1-82-3RS Chapter 57 ("Contents" and "Repair Index"), before further flight, repair the damage per de Havilland Dash 8 Generic Structural Repair Schemes Manual PSM 1-8-3RS or PSM 1-82-3RS Chapter 57 ("Contents" and "Repair Index"), and install new 0.103-inch-diameter O-ring seals per paragraph III.A., III.B., orIII.C., as applicable, of the Accomplishment Instructions of the service bulletin.

(3) If any damage is detected that is outside the limits specified in de Havilland Dash 8 Generic Structural Repair Schemes Manual PSM 1-8-3RS or PSM 1-82-3RS Chapter 57 ("Contents" and "Repair Index"), before further flight, repair per a method approved by the Manager, New York Aircraft Certification Office (ACO), FAA, and install new 0.103-inch-diameter O-ring seals.

Note 3: Although the Bombardier service bulletin includes references to solvents that are not available for use in the United States, operators may use appropriate substitute solvents per standard industry maintenance practices.

Alternative Methods of Compliance

(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 ACO, FAA. 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 4: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the New York ACO.

Special Flight Permits

(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.

Incorporation by Reference

(d) Except as provided in paragraphs (a)(2) and (a)(3) of this AD, the actions shall be done in accordance with Bombardier Service Bulletin 8-57-41, Revision "C", dated August 4, 2000. 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., Bombardier Regional Aircraft Division, 123 Garrett Boulevard, Downsview, Ontario M3K 1Y5, Canada. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, 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.

Note 5: The subject of this AD is addressed in Canadian airworthiness directive CF-99-20, dated July 20, 1999.

Effective Date

(e) This amendment becomes effective on October 3, 2001.

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 DHC-8-100, -200, and -300 series airplanes was published as a supplemental notice of proposed rulemaking (NPRM) in the Federal Register on January 5, 2001 (66 FR 1057). That action proposed to require a one-time detailed visual inspection to detect damage of the ladder plates and access cover areas of the upper surface of the wings; repair, if necessary; and installation of new O-ring seals. That action also proposed to revise the inspection requirements of the original NPRM by correcting a reference to a repair manual.

Comments

Interested persons have been afforded an opportunity to participate in the making of this amendment. No comments were submitted.

Conclusion

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

There are approximately 516 Model DHC-8-100, -200, and -300 series airplanes in the worldwide fleet. The FAA estimates that 235 Model DHC-8-100, -200, and -300 series 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. Based on these figures, the cost impact of the AD on U.S. operators is estimated to be $84,600, or $360 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 relationship between 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.

Sec. 39.13 [Amended]

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