[Federal Register Volume 71, Number 116 (Friday, June 16, 2006)]
[Rules and Regulations]
[Pages 34790-34793]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 06-5327]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2006-25011; Directorate Identifier 2006-NM-118-AD; 
Amendment 39-14646; AD 2006-12-20]
RIN 2120-AA64


Airworthiness Directives; Raytheon Model HS.125 Series 700A and 
700B Airplanes; Model BAe.125 Series 800A (Including Variants C-29A and 
U-125), 800B, 1000A, and 1000B Airplanes; and Hawker 800 (Including 
Variant U-125A), 800XP, and 1000 Airplanes

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

ACTION: Final rule; request for comments.

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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all 
Raytheon Model BAe.125 series 800A (including variants C-29A and U-
125), 800B, 1000A, and 1000B airplanes and Model Hawker 800 (including 
variant U-125A) and 1000 airplanes; and for certain Raytheon Model 
HS.125 series 700A and 700B airplanes and Model Hawker 800XP airplanes. 
This AD requires measuring the resistance of the current limiters for 
the PE, PS1, and PS2 busses, and replacing a current limiter with a new 
part if necessary. This AD also requires reporting certain information 
to the airplane manufacturer. This AD allows a records review for 
determining if suspect current limiters were installed, which may 
exempt airplanes from the required measurement. This AD results from 
reports that certain current limiters have opened within two to four 
hours after installation. We are issuing this AD to prevent loss of all 
primary electrical power, which could result in the airplane operating 
only under emergency power.

DATES: This AD becomes effective July 3, 2006.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in the AD as of July 3, 2006.
    We must receive comments on this AD by August 15, 2006.

ADDRESSES: Use one of the following addresses to submit comments on 
this AD.
     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 9:00 
a.m. and 5:00 p.m., Monday through Friday, except Federal holidays.
    Contact Raytheon Aircraft Company, Department 62, P.O. Box 85, 
Wichita, Kansas 67201-0085, for service information identified in this 
AD.

FOR FURTHER INFORMATION CONTACT: Philip Petty, Aerospace Engineer, 
Electrical Systems and Avionics, ACE-

[[Page 34791]]

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:

Discussion

    We have received several reports indicating that certain current 
limiters, part number (P/N) UAM100, have opened within two to four 
hours after installation. The current limiters are the primary bus feed 
for the PE, PS1, and PS2 busses. Three of the reports indicated that 
one or more of the current limiters opened in flight. Investigation has 
revealed that the supplier provided parts that did not meet 
specification, and that a specific batch of parts has exhibited the 
anomaly of opening. The suspect current limiters were delivered 
beginning February 1, 2006, and have picking tag purchase order (PO) 
4501760749 or PO 4501743706. These suspect parts could be installed on 
any or all three busses. Loss of all three busses may occur, resulting 
in loss of all primary direct current electrical power. This condition, 
if not corrected, could result in the airplane operating only under 
emergency power.

Relevant Service Information

    We have reviewed Raytheon Service Bulletin SB 24-3793, including 
Service Bulletin / Kit Drawing Report Fax, dated May 2006. The service 
bulletin describes the following procedures:
     Inspecting airplane maintenance records to determine if a 
24-month inspection of the current limiters has been accomplished in 
accordance with the aircraft flexible maintenance schedule (AFMS) 
beginning February 1, 2006.
     Inspecting airplane maintenance records to determine if 
any current limiter, P/N UAM100, has been replaced on condition 
beginning February 1, 2006.
     Replacing any current limiter that meets either of the two 
conditions specified above and destroying the current limiter after 
removing it from the airplane.
     Measuring the resistance of any current limiter, P/N 
UAM100, whose batch cannot be verified (i.e., the picking tag PO is 
unknown).
     Removing and destroying any current limiter, P/N UAM100, 
from picking tag PO 4501760749 or PO 4501743706 stored as a spare part.
     Reporting accomplishment of the service bulletin to the 
airplane manufacturer. Accomplishing the actions specified in the 
service information is intended to adequately address the unsafe 
condition.

FAA's Determination and Requirements of This AD

    The unsafe condition described previously is likely to exist or 
develop on other airplanes of the same type design. For this reason, we 
are issuing this AD to prevent loss of all primary electrical power, 
which could result in the airplane operating only under emergency 
power. This AD requires measuring the resistance of the current 
limiters for the PE, PS1, and PS2 busses, and replacing a current 
limiter with a new part if necessary. This AD also requires reporting 
certain information to the airplane manufacturer. This AD allows a 
records review for determining if the most recent 24-month ``F'' or 
``F7'' inspection, as applicable, and the most recent replacement of 
current limiters have been accomplished from February 1, 2006, through 
the effective date of this AD. (An ``F'' inspection is applicable to 
airplanes not on a phase program, and an ``F7'' inspection is 
applicable to airplanes on a phase program.) This AD also allows a 
records review for determining the picking tag PO of the current 
limiters. The records review may exempt airplanes from the required 
measurement. This AD differs from the referenced Raytheon service 
bulletin, as discussed under ``Differences Between the AD and Service 
Bulletin.''

Differences Between the AD and Service Bulletin

    The effectivity of the service bulletin includes all airplanes that 
may have had one or more of the suspect current limiters installed on 
an airplane, regardless of whether those suspect parts would likely 
lead to an unsafe condition. The applicability of this AD instead 
applies only to airplanes on which an unsafe condition is likely to 
exist, if suspect parts are installed on an airplane. Therefore, this 
AD does not include Raytheon Model Hawker 850XP airplanes, Model DH.125 
and BH.125 series airplanes, and certain Model HS.125 series airplanes. 
We have coordinated this difference with the manufacturer.
    The service bulletin recommends inspecting aircraft maintenance 
records to determine if a 24-month inspection and on-condition 
replacement of the current limiters have been accomplished beginning 
February 1, 2006, which could have resulted in installing a suspect 
current limiter on the airplane. This AD instead requires measuring the 
resistance of all current limiters to verify that safe parts are 
installed on an airplane. In lieu of that requirement, this AD does 
allow a records review if the date of the most recent 24-month ``F'' or 
``F7'' inspection, as applicable, and replacement of current limiters 
can be determined conclusively and shown to have not been accomplished 
from February 1, 2006, through the effective date of this AD. As an 
alternative to measuring the resistance, this AD also allows an 
operator to conduct a records review if the picking tag PO of the 
current limiters can be determined conclusively from that review and 
shown not to be from the batch of suspect parts.
    Paragraph 3.A.(2) of the service bulletin specifies that for a 
current limiter: ``The correct resistance should measure 0.00046 to 
0.00056 ohms (0.45 to 0.56 milliohms).'' We have verified with the 
manufacturer that the correct lower value is 0.46 milliohms, not 0.45 
milliohms as specified in the service bulletin. We have included the 
correct measurement in paragraph (f) of this AD.
    The service bulletin specifies to destroy suspect current limiters 
after removing them from an airplane and any suspect parts stored as 
spares. This AD, however, does not require destroying any current 
limiter.

FAA's Determination of the Effective Date

    Since an unsafe condition exists that requires the immediate 
adoption of this AD, we have found that notice and opportunity for 
public comment before issuing this AD are impracticable, and that good 
cause exists to make this AD effective in less than 30 days.

Comments Invited

    This AD is a final rule that involves requirements that affect 
flight safety and was not preceded by notice and an opportunity for 
public comment; however, we invite you to submit any relevant written 
data, views, or arguments regarding this AD. Send your comments to an 
address listed in the ADDRESSES section. Include ``Docket No. FAA-2006-
25011; Directorate Identifier 2006-NM-118-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of the AD that might 
suggest a need to modify it.
    We will post all comments we receive, 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 AD. Using the

[[Page 34792]]

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 may review the DOT's complete Privacy 
Act Statement in the Federal Register published on April 11, 2000 (65 
FR 19477-78), or you may visit http://dms.dot.gov.

Examining the Docket

    You may 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 Docket Management System 
receives them.

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 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 that the 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 AD and placed it in the AD docket. 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, 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 Federal Aviation Administration (FAA) amends Sec.  39.13 by 
adding the following new airworthiness directive (AD):

2006-12-20 Raytheon Aircraft Company: Amendment 39-14646. Docket No. 
FAA-2006-25011; Directorate Identifier 2006-NM-118-AD.

Effective Date

    (a) This AD becomes effective July 3, 2006.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to the Raytheon airplanes identified in 
paragraphs (c)(1), (c)(2), and (c)(3) of this AD, certificated in 
any category.
    (1) Model HS.125 series 700A and 700B airplanes, on which 
Raytheon Modification 252885 has been incorporated or British 
Aerospace 125 Service Bulletin SB 24-239-2885 has been accomplished.
    (2) All Model BAe.125 series 800A (including variants C-29A and 
U-125), 800B, 1000A, and 1000B airplanes.
    (3) All Model Hawker 800 (including variant U-125A) and 1000 
airplanes; and Model Hawker 800XP airplanes, serial numbers 1 
through 258768 inclusive.

Unsafe Condition

    (d) This AD results from reports that certain current limiters 
have opened within two to four hours after installation. We are 
issuing this AD to prevent loss of all primary electrical power, 
which could result in the airplane operating only under emergency 
power.

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.

Resistance Measurement and Replacement if Necessary

    (f) Within 30 days or 25 flight hours after the effective date 
of this AD, whichever occurs first: Measure the resistance of the 
applicable current limiters, part number (P/N) UAM100, in accordance 
with paragraph 3.A.(2) of the Accomplishment Instructions of 
Raytheon Service Bulletin SB 24-3793, dated May 2006. The applicable 
current limiters are listed in Table 1 of the service bulletin. If 
the measured resistance of a current limiter is less than 0.46 
milliohms or greater than 0.56 milliohms, before further flight, 
replace the part with a new part in accordance with the service 
bulletin. The new part must not be from picking tag purchase order 
(PO) 4501760749 or PO 4501743706 and must be the correct resistance 
in the range of 0.46 milliohms to 0.56 milliohms.

Records Review

    (g) A review of airplane maintenance records is acceptable in 
lieu of the resistance measurement required by paragraph (f) of this 
AD, if the criteria in paragraph (g)(1) or (g)(2) of this AD can be 
determined conclusively from that review.
    (1) The records review determines conclusively the date of the 
most recent 24-month ``F'' or ``F7'' inspection, as applicable, of 
current limiters and the date of the most recent replacement of 
current limiters, and that the inspection and replacement were not 
accomplished from February 1, 2006, through the effective date of 
this AD.
    (2) The records review determines conclusively the picking tag 
PO of the current limiters, and that the current limiters are not 
from picking tag PO 4501760749 or PO 4501743706.

Reporting Requirement

    (h) At the applicable time specified in paragraph (h)(1) or 
(h)(2) of this AD: Submit the Service Bulletin/Kit Drawing Report 
Fax (attached to Raytheon Service Bulletin SB 24-3793) to the 
Manager, Hawker Model Group, Raytheon Aircraft Company, Product 
Support Department (211), P.O. Box 85, Wichita, Kansas 67201-0085; 
fax (316) 676-3400. The report must include the results of the 
measurements required by paragraph (f) of this AD, the name(s) of 
the owner and operator of the airplane, the airplane registration 
number, the airplane serial number, and the number of landings and 
flight hours on the airplane. Under the provisions of the Paperwork 
Reduction Act (44 U.S.C. 3501 et seq.), the Office of Management and 
Budget (OMB) has approved the information collection requirements 
contained in this AD and has assigned OMB Control Number 2120-0056.
    (1) If the measurements were accomplished after the effective 
date of this AD: Submit the report within 10 days after the 
inspection.
    (2) If the measurements were accomplished before the effective 
date of this AD: Submit

[[Page 34793]]

the report within 10 days after the effective date of this AD.

Parts Installation

    (i) As of the effective date of this AD, no person may install a 
current limiter, P/N UAM100, on any airplane, unless the part meets 
one of the criteria specified in paragraphs (i)(1) and (i)(2) of 
this AD.
    (1) The picking tag PO of the current limiter can be determined 
conclusively from a review of airplane maintenance records and shown 
not to be from picking tag PO 4501760749 or PO 4501743706.
    (2) The resistance of the current limiter is measured and 
determined to be of the correct resistance in accordance with 
paragraph (f) of this AD.

Alternative Methods of Compliance (AMOCs)

    (j)(1) The Manager, Wichita Aircraft Certification Office, FAA, 
has the authority to approve AMOCs for this AD, if requested in 
accordance with the procedures found in 14 CFR 39.19.
    (2) Before using any AMOC approved in accordance with Sec.  
39.19 on any airplane to which the AMOC applies, notify the 
appropriate principal inspector in the FAA Flight Standards 
Certificate Holding District Office.

Material Incorporated by Reference

    (k) You must use Raytheon Service Bulletin SB 24-3793, including 
Service Bulletin/Kit Drawing Report Fax, dated May 2006, to perform 
the actions that are required by this AD, unless the AD specifies 
otherwise. The Director of the Federal Register approved the 
incorporation by reference of this document in accordance with 5 
U.S.C. 552(a) and 1 CFR part 51. Contact Raytheon Aircraft Company, 
Department 62, P.O. Box 85, Wichita, Kansas 67201-0085, for a copy 
of this service information. You may review copies at the Docket 
Management Facility, U.S. Department of Transportation, 400 Seventh 
Street, SW., Room PL-401, Nassif Building, Washington, DC; on the 
Internet at http://dms.dot.gov; or at the National Archives and 
Records Administration (NARA). For information on the availability 
of this material at the NARA, call (202) 741-6030, or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.

    Issued in Renton, Washington, on June 5, 2006.
Kalene C. Yanamura,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 06-5327 Filed 6-15-06; 8:45 am]
BILLING CODE 4910-13-P