AD 99-22-15

This amendment adopts a new airworthiness directive (AD), applicable to all Dornier Model 328-100 series airplanes, that requires repetitive inspections of the left and right roll spoiler actuators to check for signs of leakage and deformation of the housing, repetitive inspections of the gap between the left roll spoiler actuator housing cap and the actuator housing, repetitive torque checks of the left roll spoiler actuator housing cap attachment screws, and corrective action, if necessary. 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 oil leakage from the roll spoiler actuators, which could result in incorrect roll spoiler operation and reduced controllability of the airplane.

Final rule

99-22-15 DORNIER LUFTFAHRT GMBH: Amendment 39-11393. Docket 99-NM-01-AD.

Applicability: All Model 328-100 series airplanes, 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 (d) 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 oil leakage from the roll spoiler actuators, which could result in incorrect roll spoiler operation and reduced controllability of the airplane, accomplish the following:

(a) Within 14 days after the effective date of this AD, accomplish the requirements of paragraphs (a)(1) and (a)(2) of this AD on the left and right roll spoiler actuators, in accordance with Dornier Alert Service Bulletin ASB-328-27-025, Revision 1, dated September 22, 1999. Thereafter, repeat the inspections required by paragraphs (a)(1) and (a)(2) of this AD at intervals not to exceed 400 flight hours.

(1) Perform a detailed inspection to detect leakage of the area around the actuator cap and housing of the roll spoiler actuators. If leakage is found, prior to further flight, replace the actuator and the double shuttle valve with new or serviceable parts.

(2) Perform a detailed inspection to detect flatness of the surface of the cap of the roll spoiler actuators. If the cap surface is not flat, prior tofurther flight, replace the actuator and the double shuttle valve with new or serviceable parts.

NOTE 2: For the purposes of this AD, a detailed inspection is defined as: "An intensive visual examination of a specific structural area, system, installation, or assembly to detect 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."

(b) Within 14 days after the effective date of this AD, accomplish the requirements of paragraphs (b)(1) and (b)(2) of this AD on the left roll spoiler actuator, in accordance with Dornier Alert Service Bulletin ASB-328-27-025, Revision 1, dated September 22, 1999. Thereafter, repeat the inspections required by paragraphs (b)(1) and (b)(2) of this AD at intervals not to exceed 400 flight hours.(1) Perform a detailed inspection to detect a gap between the cap of the roll spoiler actuator and the actuator housing. If any gap exists, prior to further flight, replace the actuator and the double shuttle valve with new or serviceable parts.

(2) Perform a torque check of the housing cap attachment screws. If the torque is within the limits specified by the service bulletin, prior to further flight, torque the screws to 17.7 lb-in, in accordance with the alert service bulletin. If the torque is outside the limits specified by the service bulletin, prior to further flight, replace the left roll spoiler actuator and double shuttle valve with new or serviceable parts, in accordance with the alert service bulletin.

(c) If any left roll spoiler actuator is replaced during any inspection required by paragraph (b)(1) or (b)(2) of this AD, prior to further flight, accomplish the requirements of (b)(1) and (b)(2) for the right roll spoiler actuator.

NOTE 3: Accomplishment of the inspections required by paragraphs (a) and (b) of this AD prior to the effective date of this AD in accordance with Dornier Alert Service Bulletin ASB-328-27-025, dated October 16, 1998, is acceptable for compliance with the initial inspections required by those paragraphs.

Alternate Methods of Compliance
(d) 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, International Branch, ANM-116, FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, International Branch, ANM-116.

NOTE 4: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the International Branch, ANM-116.

Special Flight Permits
(e) Special flight permits may be issued in accordance withsections 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
(f) The actions shall be done in accordance with Dornier Alert Service Bulletin ASB-328-27-025, Revision 1, dated September 22, 1999. 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 FAIRCHILD DORNIER, DORNIER Luftfahrt 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 Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

NOTE 5: The subject of this AD is addressed in German airworthiness directive 1998-479, dated December 17, 1998.

(g) This amendment becomes effective on December 7, 1999.

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 all Dornier Model 328-100 series airplanes was published in the Federal Register on August 20, 1999 (64 FR 45468). That action proposed to require repetitive inspections of the left and right roll spoiler actuators to check for signs of leakage and deformation of the housing, repetitive inspections of the gap between the left roll spoiler actuator housing cap and the actuator housing, repetitive torque checks of the left roll spoiler actuator housing cap attachment screws, and corrective action, if necessary.

Comments
Interested persons have been afforded an opportunity to participate in the making of this amendment. Due consideration has been given to the comment received.

Request to Reference Service Bulletin Revision
One commenter, the manufacturer, requests that the proposed AD be revised to reference Dornier Alert Service Bulletin ASB-328-27-025, Revision 1, dated September 22, 1999. The commenter states that Revision 1 of the service bulletin escalates the inspection interval from the current 330 flight hours to 400 flight hours. This escalation brings the interval parallel to the recent "A-Check" escalation of the Dornier Model 328-100 Maintenance Review Board (MRB) document. The commenter notes that the escalation of the inspection intervals was considered acceptable based on certain other inspections already in place in the MRB document.

The FAA concurs. The procedures contained in Revision 1 of the service bulletin are identical to the original issue, dated October 16, 1998, which was cited in the proposed AD as the appropriate source of service information. The FAA has determined that accomplishment of the actions required by this AD in accordance with the procedures and at the intervals specified in Revision 1 of the service bulletin will adequately addressthe identified unsafe condition. Paragraphs (a) and (b) of this AD have been revised to cite Revision 1 of the service bulletin as the appropriate source of service information, and the inspection intervals have been revised to 400 flight hours. For operators that may have previously accomplished the initial inspections in accordance with the original issue of the service bulletin, "NOTE 3" of the final rule has been revised to give credit for those actions.

Conclusion
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 with the change described previously. The FAA has determined that this change will neither increase the economic burden on any operator nor increase the scope of the AD.

Cost Impact
The FAA estimates that 50 airplanes of U.S. registry will be affected by this proposed AD, that it will take approximately 3 work hours per airplane to accomplish the actions, and that the average labor rate is $60 per work hour. Based on these figures, the cost impact of this AD on U.S. operators is estimated to be $9,000, or $180 per airplane, per inspection cycle.

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.

Regulatory Impact
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 asfollows:
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: