AD 2004-06-07

This amendment adopts a new airworthiness directive (AD), applicable to certain EMBRAER Model EMB-120 series airplanes, that requires a one-time inspection for signs of overheating of wiring splices of the pitot/static 1, 2, and auxiliary sensors; the angle-of- attack sensors; the side slip sensors; and the current sensors. This action also requires follow-on actions. This action is necessary to prevent overheating of cockpit wiring, which could result in loss of operation of the affected systems, or smoke or fire in the cockpit. This action is intended to address the identified unsafe condition.

Final rule.

2004-06-07 Empresa Brasileira de Aeronautica S.A. (EMBRAER): Docket FAA-2003-16645. Amendment 39-13533. Directorate Docket No. 2003-NM- 113-AD.

Applicability: Model EMB-120 series airplanes, certificated in any category; serial numbers 120004, and 120006 through 120352 inclusive.

Compliance: Required as indicated, unless accomplished previously.

To prevent overheating of cockpit wiring, which could result in loss of operation of the affected systems, or smoke or fire in the cockpit, accomplish the following:

Airplanes Not Inspected/Modified Previously: One-Time Detailed Inspection

(a) For airplanes on which neither Part I nor Part II of the Accomplishment Instructions of EMBRAER Service Bulletin 120-30-0030, dated January 31, 2000, was accomplished prior to the effective date of this AD: Within 400 flight hours after the effective date of this AD, do a one-time detailed inspection for signs of overheating of wiring splices of the pitot/static 1, 2, and auxiliary sensors; the angle-of-attack sensors; the side slip sensors; and the current sensors, per Part I of the Accomplishment Instructions of EMBRAER Service Bulletin 120-30-0030, Change 01, dated November 28, 2000. Signs of overheating include discoloration on the electrical wires, terminations, or splices.

Note 1: 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."

Airplanes Inspected or Modified Previously: Follow-On Actions

(b) For airplanes on which Part I of the Accomplishment Instructions of EMBRAER Service Bulletin 120-30-0030, dated January 31, 2000, but not Part II of the Accomplishment Instructions of that service bulletin, was accomplished prior to the effective date of this AD: Within 400 flight hours after the effective date of this AD, do a one-time detailed inspection for signs of overheating of wiring splices of the pitot/static 1, 2, and auxiliary sensors; the angle-of-attack sensors; and the side slip sensor located at the circuit breaker panel; per Part III of the Accomplishment Instructions of EMBRAER Service Bulletin 120-30-0030, Change 01, dated November 28, 2000.

(c) For airplanes on which Part II of the Accomplishment Instructions of EMBRAER Service Bulletin 120-30-0030, dated January 31, 2000, was accomplished prior to the effective date of this AD: Within 400 flight hours after the effective date of this AD, install new identifications by doing all actions in paragraphs 2.4.2. of Part III of the Accomplishment Instructions of EMBRAER Service Bulletin 120-30-0030, Change 01, dated November 28, 2000.

Follow-On Actions

(d) For all airplanes subject to paragraph (a) or (b) of this AD: At the applicable compliance time specified in paragraph (d)(1) or (d)(2) of this AD, replace wires and relays with new wires and relays; and eliminate or relocate splices in the wiring of the pitot/static 1, 2, and auxiliary sensors; the angle-of-attack sensors; the side slip sensors; and the current sensors; as applicable; by doing all actions in paragraphs 2.3.1 through 2.3.23 of Part II of the Accomplishment Instructions of EMBRAER Service Bulletin 120-30-0030, Change 01, dated November 28, 2000.

(1) If no sign of overheating is found during any inspection per paragraph (a) or (b) of this AD: Do the actions in paragraph (d) of this AD within 2,000 flight hours after the inspection.

(2) If any sign of overheating is found during any inspection per paragraph (a) or (b) of this AD: Do the actions in paragraph (d) of this AD before further flight after the inspection.

Alternative Methodsof Compliance

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

Incorporation by Reference

(f) The actions shall be done in accordance with EMBRAER Service Bulletin 120-30-0030, Change 01, dated November 28, 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 Empresa Brasileira de Aeronautica S.A. (EMBRAER), P.O. Box 343--CEP 12.225, Sao Jose dos Campos--SP, Brazil. 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 2: The subject of this AD is addressed in Brazilian airworthiness directive 2001-06-02, dated June 26, 2001.

Effective Date

(g) This amendment becomes effective on April 29, 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 EMBRAER Model EMB-120 series airplanes was published in the Federal Register on December 11, 2003 (68 FR 69055). That action proposed to require a one-time inspection for signs of overheating of wiring splices of the pitot/ static 1, 2, and auxiliary sensors; the angle-of-attack sensors; the side slip sensors; and the current sensors. That action also proposed to require follow-on actions.

Comments

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.

Conclusion

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

Cost Impact

The FAA estimates that 250 airplanes of U.S. registry will be affected by this AD, that it will take approximately 4 work hours per airplane to accomplish the required inspection, and that the average labor rate is $65 per work hour. Based on these figures, the cost impact of the AD on U.S. operators is estimated to be $65,000, or $260 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, onthe 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, Incorporationby 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: