DEPARTMENT OF TRANSPORTATION
FEDERAL AVIATION ADMINISTRATION
14 CFR Part 39
[Docket No. FAA-2010-0158; Directorate Identifier 2010-CE-006-AD]
RIN 2120-AA64
AIRWORTHINESS DIRECTIVES; Hawker Beechcraft Corporation (Type
Certificate No. A00010WI Previously Held by Raytheon Aircraft Company)
Model 390 Airplanes
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: We propose to adopt a new airworthiness directive (AD) for
certain Hawker Beechcraft Corporation Model 390 airplanes. This proposed
AD would require you to inspect the essential bus lightning strike
protection for proper installation of metal oxide varistor (MOV) and spark
gap wiring. This proposed AD would also require you to rework the wiring
as necessary to achieve the required lightning strike/surge protection.
This proposed AD results from a report that the wires to the MOV and spark
gap were swapped. We are proposing this AD to detect and correct improper
installation of the MOV and spark gap wiring, which could result in
overload of the MOV in a lightning strike and allow electrical energy to
continue to the essential bus and disable equipment that receives power
from the essential bus. The disabled equipment could include the
autopilot, anti-skid system, hydraulic indicator, spoiler system, pilot
primary flight display, audio panel, or the 1 air data computer. This
failure could lead to a significant increase in pilot workload during
adverse operating conditions.
DATES: We must receive comments on this proposed AD by April 9, 2010.
ADDRESSES: Use one of the following addresses to comment on this proposed
AD:
Federal eRulemaking Portal: Go to http:// www.regulations.gov. Follow the
instructions for submitting comments.
Fax: (202) 493-2251.
Mail: U.S. Department of Transportation, Docket Operations, M-30, West
Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE.,
Washington, DC 20590.
Hand Delivery: U.S. Department of Transportation, Docket Operations, M-30,
West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE.,
Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday,
except Federal holidays.
For service information identified in this proposed AD, contact Hawker
Beechcraft Corporation, 9709 East Central, Wichita, Kansas 67201;
telephone: (316) 676-5034; fax: (316) 676-6614; Internet:
https://www.hawkerbeechcraft.com/service_support/pubs/.
FOR FURTHER INFORMATION CONTACT: Kevin Schwemmer, Aerospace Engineer, FAA,
Wichita Aircraft Certification Office (ACO), 1801 Airport Road, Room 100,
Wichita, Kansas 67209; telephone: (316) 946-4174; fax: (316) 946-4107; e
-mail: kevin.schwemmer@faa.gov.
SUPPLEMENTARY INFORMATION:
COMMENTS INVITED
We invite you to send any written relevant data, views, or arguments
regarding this proposed AD. Send your comments to an address listed under
the ADDRESSES section. Include the docket number, "FAA- 2010-0158;
Directorate Identifier 2010-CE-006-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://
www.regulations.gov, including any personal information you provide. We
will also post a report summarizing each substantive verbal contact we
receive concerning this proposed AD.
DISCUSSION
We received a report that on a Hawker Beechcraft Corporation Model 390
airplane the wires to the MOV and spark gap were swapped. The swapped
wires were discovered during an inspection following a lightning strike.
The spark gap has a higher current carrying capability than the MOV and is
designed to carry direct currents caused by a lightning strike. In the
event of a lightning strike, the potential exists to overload the MOV and
allow an electrical spike to pass through to the essential bus.
This condition, if not corrected, could allow electrical energy to
continue to the essential bus and disable equipment that receives power
from the essential bus. The disabled equipment could include the
autopilot, anti-skid system, hydraulic indicator, spoiler system, pilot
primary flight display, audio panel, or the 1 air data computer. This
failure could lead to a significant increase in pilot workload during
adverse operating conditions.
RELEVANT SERVICE INFORMATION
We have reviewed Hawker Beechcraft Mandatory Service Bulletin SB 24-3995,
issued September 2009. The service information describes procedures for
inspecting the essential bus lightning strike protection for proper
installation of MOV and spark gap wiring. The service information also
describes procedures for rework as necessary to achieve the required
lightning strike/surge protection.
FAA'S DETERMINATION AND REQUIREMENTS OF THE PROPOSED AD
We are proposing this AD because we evaluated all information and
determined the unsafe condition described previously is likely to exist or
develop on other products of the same type design. This proposed AD would
require you to inspect the essential bus lightning strike protection for
proper installation of MOV and spark gap wiring. This proposed AD would
also require you to rework the wiring as necessary to achieve the required
lightning strike/surge protection.
COSTS OF COMPLIANCE
We estimate that this proposed AD would affect 170 airplanes in the U.S.
registry.
We estimate the following costs to do the proposed inspection (includes
any necessary follow-on action):
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TOTAL COST PER TOTAL COST ON
LABOR COST PARTS COST AIRPLANE U.S. OPERATORS
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3 work-hours x $85 per hour = $255 Not applicable....... $255 $43,350
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Warranty credit may be given to the extent specified in Hawker Beechcraft
Mandatory Service Bulletin SB 24-3995, issued September 2009.
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.
EXAMINING THE AD DOCKET
You may examine the AD docket that contains the proposed AD, the
regulatory evaluation, any comments received, and other information on the
Internet at http://www.regulations.gov; or in person at the Docket
Management Facility between 9 a.m. and 5 p.m., Monday through Friday,
except Federal holidays. The Docket Office (telephone (800) 647-5527) is
located at the street address stated 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.
THE PROPOSED AMENDMENT
Accordingly, under the authority delegated to me by the Administrator, 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 FAA amends Sec. 39.13 by adding the following new AD: