[Federal Register Volume 70, Number 88 (Monday, May 9, 2005)]
[Proposed Rules]
[Pages 24341-24342]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 05-9189]


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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: Supplemental notice of proposed rulemaking (NPRM); reopening of 
comment period.

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SUMMARY: The FAA is revising an earlier proposed airworthiness 
directive (AD) for certain Raytheon Model HS.125 series 700A airplanes, 
BAe.125 Series 800A airplanes, and Model Hawker 800 and Hawker 800XP 
airplanes. The original NPRM would have required an inspection to 
determine the current rating of the circuit breakers of certain cockpit 
ventilation and avionics cooling system blowers; and replacing the 
circuit breakers and modifying the blower wiring, as applicable. The 
original NPRM was prompted by a report indicating that a blower motor 
seized up and gave off smoke. This action revises the original NPRM by 
clarifying the compliance time and removing a reporting requirement. We 
are proposing this supplemental NPRM 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 supplemental NPRM by June 3, 
2005.

ADDRESSES: Use one of the following addresses to submit comments on 
this supplemental NPRM.
     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.
    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 and Avionics 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 supplemental NPRM. Send your comments to an 
address listed under ADDRESSES. Include ``Docket No. FAA-2005-20111; 
Directorate Identifier 2004-NM-154-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of this supplemental NPRM. 
We will consider all comments received by the closing date and may 
amend this supplemental NPRM in light of those comments.
    We will post all comments submitted, 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 supplemental NPRM. Using the search function 
of our docket 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 the 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 in the Nassif Building at the DOT 
street address stated in ADDRESSES. Comments will be available in the 
AD docket shortly after the DMS receives them.

Discussion

    We proposed to amend 14 CFR part 39 with a notice of proposed 
rulemaking (NPRM) for an AD (the ``original NPRM'') for certain 
Raytheon Model HS.125 series 700A airplanes, Model BAe.125 series 800A 
airplanes, and Model Hawker 800 and Hawker 800XP airplanes. The 
original NPRM was published in the Federal Register on January 24, 2005 
(70 FR 3318). The original NPRM proposed to require an inspection to 
determine the current rating of the circuit breakers of certain cockpit 
ventilation and avionics cooling system blowers; and replacing the 
circuit breakers and modifying the blower wiring, as applicable.

Actions Since Original NPRM was Issued

    Since we issued the original NPRM, we discovered an important 
inconsistency in the phrasing of the compliance time. Certain wording 
in paragraph (f) of the original NPRM reads ``* * * and avionics 
cooling system blowers; and replace the circuit breakers * * *'' To 
ensure that the unsafe condition is corrected in a timely manner, we 
have revised the wording in paragraph (f) of this supplemental NPRM to 
read ``* * * and avionics cooling system blowers; and, before further 
flight, replace the circuit breakers * * *''
    We have also determined that the phrasing of paragraph (f) would 
have placed undue hardship on operators by requiring reporting of 
compliance with the service bulletin. We do not need this information 
and have revised paragraph (f) and added a new paragraph (h) to 
explicitly remove the reporting requirement in this supplemental NPRM. 
Because of the new paragraph (h), we have reidentified the existing 
paragraph (h) of the original NPRM as paragraph (i) in this 
supplemental NPRM.

[[Page 24342]]

FAA's Determination and Proposed Requirements of the Supplemental NPRM

    The changes discussed above expand the scope of the original NPRM; 
therefore, we have determined that it is necessary to reopen the 
comment period to provide additional opportunity for public comment on 
this supplemental NPRM.

Differences Between the Supplemental NPRM 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.
    Although the service bulletin describes procedures for reporting 
compliance to the manufacturer, this supplemental NPRM would not make 
such a requirement. We do not need this information from operators.

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 proposed inspection would take about 1 work hour per 
airplane, at an average labor rate of $65 per work hour. Based on these 
figures, the estimated cost of this supplemental NPRM on U.S. operators 
is $16,250, or $65 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 supplemental NPRM. 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):

Raytheon Aircraft Company: Docket No. FAA-2005-20111; Directorate 
Identifier 2004-NM-154-AD.

Comments Due Date

    (a) The Federal Aviation Administration must receive comments on 
this AD action by June 3, 2005.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Raytheon Model HS.125 series 700A 
airplanes, BAe.125 Series 800A airplanes, and Model Hawker 800 and 
Hawker 800XP airplanes; certificated in any category; equipped with 
Brailsford TBL-2.5 blowers; as identified in Raytheon Service 
Bulletin SB 24-3272, Revision 1, dated October 2000.

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 6 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, before further flight, 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; except as provided by paragraphs (g) and (h) of 
this AD.

Contacting the Manufacturer

    (g) Where the service bulletin specifies contacting the 
manufacturer for information if any difficulties are encountered 
while accomplishing the service bulletin, this AD requires you to 
contact the Manager, Wichita Aircraft Certification Office (ACO), 
FAA.

No Reporting Requirement

    (h) Although the service bulletin referenced in this AD 
specifies to submit certain information to the manufacturer, this AD 
does not include this requirement.

Alternative Methods of Compliance (AMOCs)

    (i) 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 April 29, 2005.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 05-9189 Filed 5-6-05; 8:45 am]
BILLING CODE 4910-13-P