[Federal Register: January 24, 2005 (Volume 70, Number 14)]
[Proposed Rules]
[Page 3318-3320]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr24ja05-11]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2005-20111; Directorate Identifier 2004-NM-154-AD]
RIN 2120-AA64
Airworthiness Directives; Raytheon Model HS.125 Series 700A
Airplanes, Model BAe.125 Series 800A Airplanes, and Model Hawker 800
and Hawker 800XP Airplanes
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 certain Raytheon Model HS.125 series 700A airplanes, Model BAe.125
series 800A airplanes, and Model Hawker 800 and Hawker 800XP airplanes.
This proposed AD would require an inspection to determine the current
rating of the circuit breakers of certain cockpit ventilation and
avionics cooling system blowers; and for replacing the circuit breakers
and modifying the blower wiring, as applicable. This proposed AD is
prompted by a report indicating that a blower motor seized up and gave
off smoke. Investigation revealed inadequate short circuit protection
on the blower motor electrical circuit. We are proposing this AD to
prevent smoke and fumes in the cockpit in the event that a blower motor
seizes and overheats due to excessive current draw.
DATES: We must receive comments on this proposed AD by March 10, 2005.
ADDRESSES: Use one of the following addresses to submit comments on
this proposed AD.
DOT Docket Web site: Go to [fnl<>]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.
By 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.
For service information identified in this proposed AD, contact
Raytheon Aircraft Company, Department 62, P.O. Box 85, Wichita, Kansas
67201-0085.
You can examine the contents of this AD docket on the Internet at
http://dms.dot.gov, or in person at the Docket Management Facility,
U.S. Department of Transportation, 400 Seventh Street SW., room PL-401,
on the plaza level of the Nassif Building, Washington, DC. This docket
number is FAA-2005-20111; the directorate identifier for this docket is
2004-NM-154-AD.
FOR FURTHER INFORMATION CONTACT: Philip Petty, Aerospace Engineer,
Electrical Systems Branch, ACE-119W, FAA, Wichita Aircraft
Certification Office, 1801 Airport Road, room 100, Mid-Continent
Airport, Wichita, Kansas 67209; telephone (316) 946-4139; fax (316)
946-4107.
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 under ADDRESSES. Include ``Docket No. FAA-2005-20111;
Directorate Identifier 2004-NM-154-AD'' in the subject line 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 submitted by the closing date and may amend the
proposed AD in light of those comments.
[[Page 3319]]
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 can review DOT's complete Privacy Act Statement in the
Federal Register published on April 11, 2000 (65 FR 19477-78), or you
can visit http://dms.dot.gov.
Examining the Docket
You can 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 DMS receives them.
Discussion
We have received a report indicating that a cockpit ventilation and
avionics cooling system blower motor seized up and gave off smoke on a
Raytheon Hawker Model 125-800 airplane. Investigation revealed
inadequate short circuit protection on the blower motor electrical
circuit. This condition, if not corrected, could result in smoke and
fumes in the cockpit in the event that a blower motor seizes and
overheats due to excessive current draw.
Relevant Service Information
We have reviewed Raytheon Service Bulletin SB 24-3272, Revision 1,
dated October 2000. The service bulletin describes procedures for
inspecting to determine the current rating of the circuit breakers of
certain cockpit ventilation and avionics cooling system blowers; and
for replacing the circuit breakers and modifying the blower wiring, if
applicable. Accomplishing the actions specified in the service
information is intended to adequately address the unsafe condition.
FAA's Determination and Requirements of the Proposed AD
We have evaluated all pertinent information and identified an
unsafe condition that is likely to exist or develop on other airplanes
of this same type design. Therefore, we are proposing this AD, which
would require accomplishing the actions specified in the service
information described previously, except as discussed under
``Difference Between the Proposed AD and the Service Information.''
Difference Between the Proposed AD and Service Information
Although the service bulletin specifies that operators may contact
the manufacturer for disposition of certain repair conditions, this
proposed AD would require operators to repair those conditions
according to a method approved by the FAA.
Costs of Compliance
There are about 350 airplanes of the affected design in the
worldwide fleet. This proposed AD would affect about 250 airplanes of
U.S. registry. The following table provides the estimated costs for
U.S. operators to comply with this proposed AD.
Inspection and Modification Costs
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Average
Action Work hours labor rate Parts cost Cost per
per hour airplane
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Inspection.................................................. 1 $65 No parts $65
Modification of cockpit blower circuit, if applicable....... 2 65 500 630
Modification of instrument panel blower circuit, if 12 65 500 1,280
applicable.................................................
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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. 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, 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
airworthiness directive (AD):
[[Page 3320]]
Raytheon Aircraft Company: Docket No. FAA-2005-20111; Directorate
Identifier 2004-NM-154-AD.
Comments Due Date
(a) The Federal Aviation Administration (FAA) must receive
comments on this AD action by March 10, 2005.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Raytheon Model HS.125 series 700A
airplanes, Model BAe.125 series 800A airplanes, and Model Hawker 800
and Hawker 800XP airplanes; equipped with Brailsford TBL-2.5
blowers; as identified in Raytheon Service Bulletin SB 24-3272,
Revision 1, dated October 2000; certificated in any category.
Unsafe Condition
(d) This AD was prompted by a report indicating that a cockpit
ventilation and avionics cooling system blower motor seized up and
gave off smoke due to inadequate short circuit protection on the
blower motor electrical circuit. We are issuing this AD to prevent
smoke and fumes in the cockpit in the event that a blower motor
seizes and overheats due to excessive current draw.
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.
Inspection and Corrective Actions
(f) Within 600 flight hours or six months after the effective
date of this AD, whichever occurs first, inspect to determine the
current rating of the circuit breakers of certain cockpit
ventilation and avionics cooling system blowers; and replace the
circuit breakers and modify the blower wiring, as applicable; by
doing all the actions in accordance with the Accomplishment
Instructions of Raytheon Service Bulletin SB 24-3272, Revision 1,
dated October 2000.
Contacting the Manufacturer
(g) Where the service bulletin suggests contacting the
manufacturer for information if any difficulties are encountered
while accomplishing the service bulletin, this AD would require you
to contact the Manager, Wichita Aircraft Certification Office (ACO),
FAA.
Alternative Methods of Compliance (AMOCs)
(h) The Manager, Wichita ACO, has the authority to approve AMOCs
for this AD, if requested in accordance with the procedures found in
14 CFR 39.19.
Issued in Renton, Washington, on January 12, 2005.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 05-1221 Filed 1-21-05; 8:45 am]
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