Airworthiness Directives; Dornier Model 328-100 Series Airplanes

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 99-NM-01-AD; Amendment 39-11393; AD 99-22-15]

RIN 2120-AA64

Airworthiness Directives; Dornier Model 328-100 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 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

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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.

DATES: Effective December 7, 1999.

The incorporation by reference of certain publications listed in

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

of December 7, 1999.

ADDRESSES: The service information referenced in this AD may be

obtained from Fairchild Dornier, Dornier Luftfahrt GmbH, P.O. Box 1103,

D-82230 Wessling, Germany. 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

Office of the Federal Register, 800 North Capitol Street, NW., suite

700, Washington, DC.

FOR FURTHER INFORMATION CONTACT: Norman B. Martenson, Manager,

International Branch, ANM-116, FAA, Transport Airplane Directorate,

1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425)

227-2110; fax (425) 227-1149.

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 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 address the 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 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:

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

[[Page 59119]]

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 to further 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 with

Secs. 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.

Issued in Renton, Washington, on October 22, 1999.

Vi L. Lipski,

Acting Manager, Transport Airplane Directorate, Aircraft Certification

Service.

[FR Doc. 99-28245 Filed 11-1-99; 8:45 am]

BILLING CODE 4910-13-U