
[Federal Register: May 8, 2008 (Volume 73, Number 90)]
[Rules and Regulations]               
[Page 25984-25986]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr08my08-7]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0118; Directorate Identifier 2007-NM-289-AD; 
Amendment 39-15502; AD 2008-09-21]
RIN 2120-AA64

 
Airworthiness Directives; Dassault Model Mystere-Falcon 50 
Airplanes

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

ACTION: Final rule.

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SUMMARY: We are adopting a new airworthiness directive (AD) for the 
products listed above. This AD results from mandatory continuing 
airworthiness information (MCAI) originated by an aviation authority of 
another country to identify and correct an unsafe condition on an 
aviation product. The MCAI describes the unsafe condition as:

    This Airworthiness Directive (AD) is issued following the 
discovery of a risk of chafing between an electrical feeder bundle 
and a bus bar under the circuit breaker panel. Most of the time, 
this possible chafing would be dormant and would lead to an 
uneventful loss of segregation within the different electrical 
system components. However, missing segregation combined with 
additional electrical failures may impair flight safety.
* * * * *

Chafing between an electrical feeder bundle and a bus bar under the 
circuit breaker panel could lead to electrical arcing, which could 
result in smoke and fire in the cockpit. We are issuing this AD to 
require actions to correct the unsafe condition on these products.

DATES: This AD becomes effective June 12, 2008.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in this AD as of June 12, 
2008.

ADDRESSES: You may examine the AD docket on the Internet at http://
www.regulations.gov or in person at the U.S. Department of 
Transportation, Docket Operations, M-30, West Building Ground Floor, 
Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC.

FOR FURTHER INFORMATION CONTACT: Tom Rodriguez, Aerospace Engineer, 
International Branch, ANM-116, FAA, Transport Airplane Directorate, 
1601 Lind Avenue SW., Renton, Washington 98057-3356; telephone (425) 
227-1137; fax (425) 227-1149.

SUPPLEMENTARY INFORMATION: 

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 to include an AD that would apply to the specified products. 
That NPRM was published in the Federal Register on February 5, 2008 (73 
FR 6620). That NPRM proposed to correct an unsafe condition for the 
specified products. The MCAI states:

    This Airworthiness Directive (AD) is issued following the 
discovery of a risk of chafing between an electrical feeder bundle 
and a bus bar under the circuit breaker panel. Most of the time, 
this possible chafing would be dormant and would lead to an 
uneventful loss of segregation within the different electrical 
system components. However, missing segregation combined with 
additional electrical failures may impair flight safety.
    This AD mandates inspection of the electrical feeder bundle, and 
modification of its routing under the circuit breaker panel through 
implementation of modification M3093.

Chafing between an electrical feeder bundle and a bus bar under the 
circuit breaker panel could lead to electrical arcing, which could 
result in smoke and fire in the cockpit.
    The corrective action includes repairing or replacing damaged 
wiring; re-routing the feeder cables above the wiring of the ``Avionic 
Master'' and ``Aux Bat'' relays; installing a protective sheath on the 
feeder cables; adding spacers to separate the bus bar wiring assemblies 
from the feeder cables; and adding Teflon protection on the feeder 
cables and securing the feeder cables with wiring retaining strips. You 
may obtain further information by examining the MCAI in the AD docket.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We received no comments on the NPRM or on the determination of 
the cost to the public.

Conclusion

    We reviewed the available data and determined that air safety and 
the public interest require adopting the AD as proposed.

Differences Between This AD and the MCAI or Service Information

    We have reviewed the MCAI and related service information and, in 
general, agree with their substance. But we might have found it 
necessary to use different words from those in the MCAI to ensure the 
AD is clear for U.S. operators and is enforceable. In making these 
changes, we do not intend to differ

[[Page 25985]]

substantively from the information provided in the MCAI and related 
service information.
    We might also have required different actions in this AD from those 
in the MCAI in order to follow our FAA policies. Any such differences 
are highlighted in a NOTE within the AD.

Costs of Compliance

    We estimate that this AD will affect about 76 products of U.S. 
registry. We also estimate that it will take about 12 work-hours per 
product to comply with the basic requirements of this AD. The average 
labor rate is $80 per work-hour. Required parts will cost about $0 per 
product. Where the service information lists required parts costs that 
are covered under warranty, we have assumed that there will be no 
charge for these parts. As we do not control warranty coverage for 
affected parties, some parties may incur costs higher than estimated 
here. Based on these figures, we estimate the cost of this AD to the 
U.S. operators to be $72,960, or $960 per product.

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 determined that this AD will not have federalism implications 
under Executive Order 13132. This AD 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.
    For the reasons discussed above, I certify this AD:
    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 AD and placed it in the AD docket.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://
www.regulations.gov; or in person at the Docket Operations office 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The AD docket contains the NPRM, the regulatory evaluation, 
any comments received, and other information. The street address for 
the Docket Operations office (telephone (800) 647-5527) is in the 
ADDRESSES section. Comments will be available in the AD docket shortly 
after receipt.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator, 
the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
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]

0
2. The FAA amends Sec.  39.13 by adding the following new AD:

2008-09-21 Dassault Aviation: Amendment 39-15502. Docket No. FAA-
2008-0118; Directorate Identifier 2007-NM-289-AD.

Effective Date

    (a) This airworthiness directive (AD) becomes effective June 12, 
2008.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Dassault Model Mystere-Falcon 50 
airplanes, certificated in any category, serial number (S/N) 251 and 
S/N 253 and subsequent, without modification M3093 implemented.

Subject

    (d) Air Transport Association (ATA) of America Code 24: 
Electrical power.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:

    This Airworthiness Directive (AD) is issued following the 
discovery of a risk of chafing between an electrical feeder bundle 
and a bus bar under the circuit breaker panel. Most of the time, 
this possible chafing would be dormant and would lead to an 
uneventful loss of segregation within the different electrical 
system components. However, missing segregation combined with 
additional electrical failures may impair flight safety.
    This AD mandates inspection of the electrical feeder bundle, and 
modification of its routing under the circuit breaker panel through 
implementation of modification M3093.

Chafing between an electrical feeder bundle and a bus bar under the 
circuit breaker panel could lead to electrical arcing, which could 
result in smoke and fire in the cockpit. The corrective action 
includes repairing or replacing damaged wiring; re-routing the 
feeder cables above the wiring of the ``Avionic Master'' and ``Aux 
Bat'' relays; installing a protective sheath on the feeder cables; 
adding spacers to separate the bus bar wiring assemblies from the 
feeder cables; and adding Teflon protection on the feeder cables and 
securing the feeder cables with wiring retaining strips.

Actions and Compliance

    (f) Unless already done: Within 13 months after the effective 
date of this AD, inspect for damage of the electrical feeder bundle; 
repair or replace wiring, as applicable; and modify its routing as 
detailed in the accomplishment instructions paragraph of Dassault 
Service Bulletin F50-483, dated June 6, 2007, including Erratum 
dated July 2007.

FAA AD Differences

    Note: This AD differs from the MCAI and/or service information 
as follows: No differences.

Other FAA AD Provisions

    (g) The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, 
International Branch, ANM-116, Transport Airplane Directorate, FAA, 
has the authority to approve AMOCs for this AD, if requested using 
the procedures found in 14 CFR 39.19. Send information to ATTN: Tom 
Rodriguez, Aerospace Engineer, International Branch, ANM-116, 
Transport Airplane Directorate, FAA, 1601 Lind Avenue SW., Renton, 
Washington 98057-3356; telephone (425) 227-1137; fax (425) 227-1149. 
Before using any approved AMOC on any airplane to which the AMOC 
applies, notify your appropriate principal inspector (PI) in the FAA 
Flight Standards District Office (FSDO), or lacking a PI, your local 
FSDO.
    (2) Airworthy Product: For any requirement in this AD to obtain 
corrective actions from a manufacturer or other source, use these 
actions if they are FAA-approved. Corrective actions are considered 
FAA-approved if they are approved by the State of Design Authority

[[Page 25986]]

(or their delegated agent). You are required to assure the product 
is airworthy before it is returned to service.
    (3) Reporting Requirements: For any reporting requirement in 
this AD, under the provisions of the Paperwork Reduction Act, the 
Office of Management and Budget (OMB) has approved the information 
collection requirements and has assigned OMB Control Number 2120-
0056.

Related Information

    (h) Refer to MCAI European Aviation Safety Agency (EASA) 
Airworthiness Directive 2007-0175, dated June 28, 2007; and Dassault 
Service Bulletin F50-483, dated June 6, 2007, including Erratum 
dated July 2007; for related information.

Material Incorporated by Reference

    (i) You must use Dassault Service Bulletin F50-483, dated June 
6, 2007, including Erratum dated July 2007, to do the actions 
required by this AD, unless the AD specifies otherwise.
    (1) The Director of the Federal Register approved the 
incorporation by reference of this service information under 5 
U.S.C. 552(a) and 1 CFR part 51.
    (2) For service information identified in this AD, contact 
Dassault Falcon Jet, P.O. Box 2000, South Hackensack, New Jersey 
07606.
    (3) You may review copies at the FAA, Transport Airplane 
Directorate, 1601 Lind Avenue SW., Renton, Washington; or at the 
National Archives and Records Administration (NARA). For information 
on the availability of this material at NARA, call (202) 741-6030, 
or go to: http://www.archives.gov/federal-register/cfr/ibr-
locations.html.

    Issued in Renton, Washington, on April 23, 2008.
Ali Bahrami,
Manager,Transport Airplane Directorate, Aircraft Certification Service.
 [FR Doc. E8-9895 Filed 5-7-08; 8:45 am]

BILLING CODE 4910-13-P
