[Federal Register Volume 71, Number 49 (Tuesday, March 14, 2006)]
[Proposed Rules]
[Pages 13058-13060]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E6-3563]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2006-24120; Directorate Identifier 2006-NM-021-AD]
RIN 2120-AA64


Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. 
(EMBRAER) EMB-120() Airplane Models in Operation

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for all Empresa Brasileira de Aeronautica S.A. (EMBRAER) EMB-120() 
airplane models in operation. This proposed AD would require replacing 
the protective tubes and conduits of the wiring harnesses of the 
refueling vent and pilot valves with non-conductive hoses; modifying 
the harness wiring and supports; and rerouting the harnesses to prevent 
interference with adjacent strobe light connectors; as applicable. This 
proposed AD results from a fuel system review conducted by the 
manufacturer. We are proposing this AD to prevent a potential source of 
ignition near a fuel tank, which, in combination with flammable fuel 
vapors, could result in a fuel tank explosion.

DATES: We must receive comments on this proposed AD by April 13, 2006.

ADDRESSES: Use one of the following addresses to submit comments on 
this proposed AD.
     DOT Docket Web site: Go to http://dms.dot.gov and follow 
the instructions for sending your comments electronically.
     Government-wide rulemaking Web site: Go to http://www.regulations.gov and follow the instructions for sending your 
comments electronically.
     Mail: Docket Management Facility, U.S. Department of 
Transportation, 400 Seventh Street, SW., Nassif Building, room PL-401, 
Washington, DC 20590.
     Fax: (202) 493-2251.
     Hand Delivery: Room PL-401 on the plaza level of the 
Nassif Building, 400 Seventh Street, SW., Washington, DC, between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    Contact Empresa Brasileira de Aeronautica S.A. (EMBRAER), P.O. Box 
343--CEP 12.225, Sao Jose dos Campos--SP, Brazil, for service 
information identified in this proposed AD.

FOR FURTHER INFORMATION CONTACT: Dan Rodina, Aerospace Engineer, 
International Branch, ANM-116, FAA, Transport Airplane Directorate, 
1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425) 
227-2125; fax (425) 227-1149.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to submit any relevant written data, views, or 
arguments regarding this proposed AD. Send your comments to an address 
listed in the ADDRESSES section. Include the docket number ``FAA-2006-
24120; Directorate Identifier 2006-NM-021-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of the proposed AD. We will 
consider all comments received by the closing date and may amend the 
proposed AD in light of those comments.
    We will post all comments we receive, without change, to http://dms.dot.gov, including any personal information you provide. We will 
also post a report summarizing each substantive verbal contact with FAA 
personnel concerning this proposed AD. Using the search function of 
that Web site, anyone can find and read the comments in any of our 
dockets, including the name of the individual who sent the comment (or 
signed the comment on behalf of an association, business, labor union, 
etc.). You may review the DOT's complete Privacy Act Statement in the 
Federal Register published on April 11, 2000 (65 FR 19477-78), or you 
may visit http://dms.dot.gov.

Examining the Docket

    You may examine the AD docket on the Internet at http://dms.dot.gov, or in person at the Docket Management Facility office 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The Docket Management Facility office (telephone (800) 647-
5227) is located on the plaza level of the Nassif Building at the DOT 
street address stated in the ADDRESSES section. Comments will be 
available in the AD docket shortly after the Docket Management System 
receives them.

Discussion

    The FAA has examined the underlying safety issues involved in fuel 
tank explosions on several large transport airplanes, including the 
adequacy of existing regulations, the service history of airplanes 
subject to those regulations, and existing maintenance practices for 
fuel tank

[[Page 13059]]

systems. As a result of those findings, we issued a regulation titled 
``Transport Airplane Fuel Tank System Design Review, Flammability 
Reduction and Maintenance and Inspection Requirements'' (67 FR 23086, 
May 7, 2001). In addition to new airworthiness standards for transport 
airplanes and new maintenance requirements, this rule included Special 
Federal Aviation Regulation No. 88 (``SFAR 88,'' Amendment 21-78, and 
subsequent Amendments 21-82 and 21-83).
    Among other actions, SFAR 88 requires certain type design (i.e., 
type certificate (TC) and supplemental type certificate (STC)) holders 
to substantiate that their fuel tank systems can prevent ignition 
sources in the fuel tanks. This requirement applies to type design 
holders for large turbine-powered transport airplanes and for 
subsequent modifications to those airplanes. It requires them to 
perform design reviews and to develop design changes and maintenance 
procedures if their designs do not meet the new fuel tank safety 
standards. As explained in the preamble to the rule, we intended to 
adopt airworthiness directives to mandate any changes found necessary 
to address unsafe conditions identified as a result of these reviews.
    In evaluating these design reviews, we have established four 
criteria intended to define the unsafe conditions associated with fuel 
tank systems that require corrective actions. The percentage of 
operating time during which fuel tanks are exposed to flammable 
conditions is one of these criteria. The other three criteria address 
the failure types under evaluation: single failures, single failures in 
combination with another latent condition(s), and in-service failure 
experience. For all four criteria, the evaluations included 
consideration of previous actions taken that may mitigate the need for 
further action.
    We have determined that the actions identified in this AD are 
necessary to reduce the potential of ignition sources inside fuel 
tanks, which, in combination with flammable fuel vapors, could result 
in fuel tank explosions and consequent loss of the airplane.
    The Departmento de Aviacao Civil (DAC), which is the airworthiness 
authority for Brazil, notified us that an unsafe condition may exist on 
all Empresa Brasileira de Aeronautica S.A. (EMBRAER) EMB-120() airplane 
models in operation. The DAC advises that a fuel system review 
conducted by the manufacturer showed that protective tubes and conduits 
around the wiring harnesses of the refueling vent and pilot valves must 
be replaced with non-conductive hoses; and that certain rewiring and 
rerouting of the harnesses are needed to prevent interference with 
adjacent strobe light connectors. This condition, if not corrected, 
could result in a potential source of ignition near a fuel tank, which, 
in combination with flammable fuel vapors, could result in a fuel tank 
explosion.

Relevant Service Information

    EMBRAER has issued Service Bulletin 120-28-0014, Revision 01, dated 
November 4, 2004. For certain airplanes, Part I of the Accomplishment 
Instructions of the service bulletin describes procedures for replacing 
the protective tubes and conduits of the wiring harnesses of the 
refueling vent and pilot valves with non-conductive hoses; modifying 
the harness wiring and supports; and rerouting the wiring harnesses. 
For certain other airplanes, Part II of the Accomplishment Instructions 
of the service bulletin describes procedures for replacing the 
protective tubes of the wiring harnesses with non-conductive hoses. 
Accomplishing the actions specified in the service information is 
intended to adequately address the unsafe condition. The DAC mandated 
the service information and issued Brazilian airworthiness directive 
2005-12-04, dated January 19, 2006, to ensure the continued 
airworthiness of these airplanes in Brazil.

FAA's Determination and Requirements of the Proposed AD

    These airplane models are manufactured in Brazil and are type 
certificated for operation in the United States under the provisions of 
section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and 
the applicable bilateral airworthiness agreement. Pursuant to this 
bilateral airworthiness agreement, the DAC has kept the FAA informed of 
the situation described above. We have examined the DAC's findings, 
evaluated all pertinent information, and determined that we need to 
issue an AD for airplanes of this type design that are certificated for 
operation in the United States.
    Therefore, we are proposing this AD, which would require 
accomplishing the actions specified in the service information 
described previously.

Costs of Compliance

    This proposed AD would affect about 180 airplanes of U.S. registry. 
The proposed actions would take between 4 and 24 work hours per 
airplane, at an average labor rate of $65 per work hour. Required parts 
would cost between $555 and $6,179 per airplane. Based on these 
figures, which depend upon airplane configuration, the estimated cost 
of the proposed AD for U.S. operators is between $146,700 and 
$1,393,020, or between $815 and $7,739 per airplane.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. Subtitle VII, Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    We are issuing this rulemaking under the authority described in 
subtitle VII, part A, subpart III, section 44701, ``General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    We have determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would 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.
    For the reasons discussed above, I certify that the proposed 
regulation:
    1. Is not a ``significant regulatory action'' under Executive Order 
12866;
    2. Is not a ``significant rule'' under the 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.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this proposed AD and placed it in the AD docket. See the 
ADDRESSES section for a location to examine the regulatory evaluation.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator,

[[Page 13060]]

the FAA proposes to amend 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. The Federal Aviation Administration (FAA) amends Sec.  39.13 by 
adding the following new airworthiness directive (AD):

Empresa Brasileira de Aeronautica S.A. (EMBRAER): Docket No. FAA-
2006-24120; Directorate Identifier 2006-NM-021-AD.

Comments Due Date

    (a) The FAA must receive comments on this AD action by April 13, 
2006.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to all EMBRAER Model EMB-120() airplane 
models in operation, certificated in any category.

Unsafe Condition

    (d) This AD results from a fuel system review conducted by the 
manufacturer. We are issuing this AD to prevent a potential source 
of ignition near a fuel tank, which, in combination with flammable 
fuel vapors, could result in a fuel tank explosion.

Compliance

    (e) You are responsible for having the actions required by this 
AD performed within the compliance times specified, unless the 
actions have already been done.

Rerouting Harnesses and Replacing Harness Conduits

    (f) Within 5,000 flight hours after the effective date of this 
AD, perform the actions specified in paragraph (f)(1) or (f)(2) of 
this AD, as applicable, in accordance with the Accomplishment 
Instructions of EMBRAER Service Bulletin 120-28-0014, Revision 01, 
dated November 4, 2004.
    (1) For Group I airplanes as identified in paragraph 1.1.1(a) or 
for Group II airplanes as identified in paragraph 1.1.1(b) of the 
service bulletin, as applicable: Modify the supports and wiring of 
the refueling vent and pilot valves wiring harnesses; reroute the 
harnesses to prevent interference with adjacent strobe light 
connectors; and replace the protective tubes and conduits of the 
harnesses with non-conductive hoses; in accordance with Part I of 
the Accomplishment Instructions of the service bulletin.
    (2) For all remaining airplanes as identified in paragraph 1.1.2 
of the service bulletin: Replace the protective tubes of the wiring 
harnesses of the refueling vent and pilot valves with non-conductive 
hoses; in accordance with Part II of the Accomplishment Instructions 
of the service bulletin.

Credit for Prior Revision of Service Information

    (g) Actions accomplished before the effective date of this AD in 
accordance with EMBRAER Service Bulletin 120-28-0014, dated April 
19, 2004, are considered acceptable for compliance with the 
corresponding requirements of this AD.

Alternative Methods of Compliance (AMOCs)

    (h)(1) The Manager, International Branch, ANM-116, Transport 
Airplane Directorate, FAA, has the authority to approve AMOCs for 
this AD, if requested in accordance with the procedures found in 14 
CFR 39.19.
    (2) Before using any AMOC approved in accordance with Sec.  
39.19 on any airplane to which the AMOC applies, notify the 
appropriate principal inspector in the FAA Flight Standards 
Certificate Holding District Office.

Related Information

    (i) Brazilian airworthiness directive 2005-12-04, dated January 
19, 2006, also addresses the subject of this AD.

    Issued in Renton, Washington, on March 3, 2006.
Kalene C. Yanamura,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. E6-3563 Filed 3-13-06; 8:45 am]
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