[Federal Register Volume 73, Number 229 (Wednesday, November 26, 2008)]
[Proposed Rules]
[Pages 71959-71961]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E8-28168]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-1240; Directorate Identifier 2008-NM-098-AD]
RIN 2120-AA64


Airworthiness Directives; Hawker Beechcraft Corporation Model 
BH.125 Series 600A Airplanes and Model HS.125 Series 700A Airplanes 
Modified in Accordance With Supplemental Type Certificate (STC) 
SA2271SW

AGENCY: Federal Aviation Administration (FAA), 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 BH.125 series 600A 
airplanes and Model HS.125 series 700A airplanes. This proposed AD 
would require inspecting the wiring diagrams containing the cockpit 
blowers and comparing with the current airplane configuration, and 
reworking the wiring if necessary. This proposed AD results from a 
report indicating that a blower motor of the cockpit ventilation and 
avionics cooling system seized up and gave off smoke. 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 January 12, 
2009.

ADDRESSES: You may send comments by any of the following methods:
     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 AD, contact Hawker 
Beechcraft Corporation, Department 62, P.O. Box

[[Page 71960]]

85, Wichita, Kansas 67201-0085; telephone 316-676-8238; fax 316-676-
6706; e-mail [email protected]; Internet https://www.hawkerbeechcraft.com/service_support/pubs.

Examining the AD Docket

    You may examine the AD docket 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 AD docket contains this proposed AD, the regulatory 
evaluation, any comments received, and other information. The street 
address for the Docket Office (telephone 800-647-5527) is in the 
ADDRESSES section. Comments will be available in the AD docket shortly 
after receipt.

FOR FURTHER INFORMATION CONTACT: Andy Shaw, Aerospace Engineer, Special 
Certification Office, ASW-190, FAA Southwest Regional Office, 2601 
Meacham Boulevard, Fort Worth, Texas 76137; telephone (817) 222-5188; 
fax (817) 222-5785.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposed AD. Send your comments to an address 
listed under the ADDRESSES section. Include ``Docket No. FAA-2008-1240; 
Directorate Identifier 2008-NM-098-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of this proposed AD. We 
will consider all comments received by the closing date and may amend 
this proposed AD because 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 about this proposed AD.

Discussion

    We have received a report indicating that a blower motor of the 
cockpit ventilation and avionics cooling system seized up and gave off 
smoke on a Raytheon Model Hawker 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.
    The cockpit blowers on certain Hawker Beechcraft Corporation Model 
BH.125 series 600A airplanes and Model HS.125 series 700A airplanes 
modified in accordance with Supplemental Type Certificate (STC) 
SA2271SW are identical to those on the affected Raytheon Model Hawker 
125-800 airplanes. Therefore, all of these models may be subject to the 
same unsafe condition.

Other Relevant Rulemaking

    We previously issued AD 2005-16-02, amendment 39-14207 (70 FR 
44273, August 2, 2005), applicable to certain Raytheon Model HS.125 
series 700A airplanes, Model BAe.125 series 800A airplanes, and Model 
Hawker 800 and Hawker 800XP airplanes. That AD requires inspecting 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.

Relevant Service Information

    We have reviewed Hawker Beechcraft Mandatory Service Bulletin 24-
3850, dated January 2008. The service bulletin describes procedures for 
inspecting the wiring diagrams containing the cockpit blowers and 
comparing with the current airplane configuration, and reworking the 
wiring if necessary.

FAA's Determination and Requirements of This Proposed AD

    We are proposing this AD because we evaluated all relevant 
information and determined the unsafe condition described previously is 
likely to exist or develop in other products of the(se) same type 
design(s). This proposed AD would require accomplishing the actions 
specified in the service information described previously, except as 
discussed under ``Differences Between the Proposed AD and Service 
Bulletin.''

Differences Between the Proposed AD and Service Bulletin

    Although the NOTE specified in paragraph 3.A. of the Accomplishment 
Instructions of Hawker Beechcraft Mandatory Service Bulletin 24-3850 
specifies that operators should consult the Inspection Authorization, 
Designated Engineering Representative, FAA, or Hawker Beechcraft 
Corporation for determination as to the suitability of the service 
bulletin, this proposed AD would require that the determination be 
approved by the FAA.
    Operators should note that, although the Accomplishment 
Instructions of the referenced service bulletin describe procedures for 
submitting a sheet recording compliance with the service bulletin, this 
proposed AD would not require that action.

Costs of Compliance

    We estimate that this proposed AD would affect 40 airplanes of U.S. 
registry. We also estimate that it would take about 1 work-hour per 
product to comply with this inspection proposed by this AD. The average 
labor rate is $80 per work-hour. Based on these figures, we estimate 
the cost of this proposed AD to the U.S. operators to be $3,200, or $80 
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 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 this 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.
    You can find our regulatory evaluation and the estimated costs of 
compliance in the AD Docket.

[[Page 71961]]

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:

Arkansas Modification Center, Inc.: Docket No. FAA-2008-1240; 
Directorate Identifier 2008-NM-098-AD.

Comments Due Date

    (a) We must receive comments by January 12, 2009.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Hawker Beechcraft Corporation Model 
BH.125 series 600A airplanes and Model HS.125 series 700A airplanes, 
certificated in any category; as identified in Hawker Beechcraft 
Mandatory Service Bulletin 24-3850, dated January 2008, which have 
been modified in accordance with Supplemental Type Certificate 
SA2271SW.

Unsafe Condition

    (d) This AD results from a report indicating that a blower motor 
of the cockpit ventilation and avionics cooling system seized up and 
gave off smoke. 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) Comply with this AD within the compliance times specified, 
unless already done.

Inspection and Rework

    (f) Within 600 flight hours or 6 months after the effective date 
of this AD, whichever occurs first, inspect the wiring diagrams 
containing the cockpit blowers and compare with the current airplane 
configuration, in accordance with the Accomplishment Instructions of 
Hawker Beechcraft Mandatory Service Bulletin 24-3850, dated January 
2008; except as provided by paragraph (g) of this AD.
    (1) If the current airplane configuration does not match the 
applicable cockpit blower wiring diagrams, before further flight, 
rework the wiring using a method approved by the Manager, Special 
Certification Office, ASW-190, Rotorcraft Directorate, FAA. For the 
determination to be approved by the Manager, Special Certification 
Office, as required by this paragraph, the Manager's approval letter 
must specifically refer to this AD.
    (2) If the current airplane configuration matches the applicable 
cockpit blower wiring diagrams, before further flight, rework the 
wiring in accordance with the Accomplishment Instructions of Hawker 
Beechcraft Mandatory Service Bulletin 24-3850, dated January 2008.

No Submission of Certain Information

    (g) Although Hawker Beechcraft Mandatory Service Bulletin 24-
3850, dated January 2008, specifies to submit certain information to 
the manufacturer, this AD does not include that requirement.

Alternative Methods of Compliance (AMOCs)

    (h)(1) The Manager, Special Certification Office, ASW-190, 
Rotorcraft Directorate, FAA, ATTN: Andy Shaw, Aerospace Engineer, 
Special Certification Office, ASW-190, FAA, Southwest Regional 
Office, 2601 Meacham Boulevard, Fort Worth, Texas 76137; telephone 
(817) 222-5188; fax (817) 222-5785; has the authority to approve 
AMOCs for this AD, if requested using the procedures found in 14 CFR 
39.19.
    (2) To request a different method of compliance or a different 
compliance time for this AD, follow the procedures in 14 CFR 39.19. 
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.

    Issued in Renton, Washington, on November 16, 2008.
Stephen P. Boyd,
Assistant Manager, Transport Airplane Directorate, Aircraft 
Certification Service.
[FR Doc. E8-28168 Filed 11-25-08; 8:45 am]
BILLING CODE 4910-13-P