[Federal Register Volume 70, Number 21 (Wednesday, February 2, 2005)]
[Proposed Rules]
[Pages 5387-5390]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 05-1925]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2005-20251; Directorate Identifier 2004-NM-164-AD]
RIN 2120-AA64


Airworthiness Directives; Raytheon Model 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 Hawker 800XP airplanes. This proposed AD 
would require inspecting to detect damage of certain wiring in the 
flight compartment, performing corrective actions if necessary, 
modifying certain wiring connections, and revising the airplane flight 
manual. This proposed AD is prompted by reports of miswiring in the 
power distribution system. We are proposing this AD to ensure that the 
flightcrew is aware of the source of battery power for certain 
equipment, and to prevent damage to wiring and surrounding equipment 
that could result in smoke or fire on the airplane.

DATES: We must receive comments on this proposed AD by March 21, 2005.

ADDRESSES: Use one of the following addresses to submit comments on 
this proposed 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.
     By fax: (202) 493-2251.

[[Page 5388]]

     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-2005-20251; the directorate identifier for this docket is 
2004-NM-164-AD.

FOR FURTHER INFORMATION CONTACT: Philip Petty, Aerospace Engineer, 
Electrical Systems and Avionics, 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-2005-20251; 
Directorate Identifier 2004-NM-164-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.
    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 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 miswiring in the flight 
compartment has been found on Raytheon Model Hawker 800XP airplanes. In 
one case, this miswiring affects the radio emergency switch, which is 
intended to ensure that the flightcrew is able to use navigation and 
communication radios when the airplane batteries are depleted during an 
electrical emergency. However, activating the radio emergency switch 
under normal aircraft operating conditions links the 35-amp essential 
radio bus and the radio emergency bus, which results in several wires 
being connected to the 35-amp essential radio bus without protection by 
circuit breakers or fuses. If one of these wires were to short to 
ground or be exposed to excessive current flow, wires, connectors, 
relays, or surrounding circuits or equipment may be damaged. Operating 
the radio emergency switch in accordance with the Emergency Procedures 
section of the airplane flight manual (AFM) will not cause the 
condition. In another case, miswiring has resulted in battery no. 3 
supplying power to equipment that the Emergency Procedures section of 
the AFM identifies as being supplied by battery no. 4 and vice versa. 
These conditions, if not corrected, could cause the flightcrew to be 
misled about the source of battery power for certain equipment, or 
could lead to damage to wiring and surrounding equipment that could 
result in smoke or fire on the airplane.

Relevant Service Information

    We have reviewed Raytheon Service Bulletin 24-3555, Revision 1, 
dated June 2004. Part 1 of the service bulletin describes procedures 
for visually inspecting for damage (primarily, but not limited to, 
evidence of heat damage) of wiring in the flight compartment. If any 
damage is found, corrective actions include performing repairs, or 
replacing damaged wiring with new wiring and replacing, with new parts, 
any relays or connectors from which damaged wiring extends. Part 2 of 
the service bulletin describes procedures for modifying certain wiring 
connections in the flight compartment, which includes replacing a 
certain circuitbreaker switch with an improved part, installing new 
busbars, and replacing a certain circuitbreaker with an improved part.
    The service bulletin also specifies revising the Emergency 
Procedures section of the AFM to include a certain temporary change. We 
have reviewed Raytheon Hawker 800XP Temporary Change 140-590032-
0005TC7, dated June 3, 2003, which is intended to inform the flightcrew 
which standby batteries provide power to what equipment once the 
actions in Raytheon Service Bulletin 24-3555, Revision 1, have been 
done.
    Accomplishing the actions specified in Raytheon Service Bulletin 
24-3555, Revision 1, 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 
``Differences Between the Proposed AD and Service Information.''

Clarification of Inspection Type

    Raytheon Service Bulletin 24-3555, Revision 1, specifies visually 
inspecting for damage of certain wiring in the flight compartment. We 
find that the procedures described in the service bulletin constitute a 
detailed inspection. Note 1 of this proposed AD defines what we mean by 
``detailed inspection.''

Differences Between the Proposed AD and Service Information

    Where Raytheon Service Bulletin 24-3555, Revision 1, specifies 
contacting the manufacturer for information on certain actions, this 
proposed AD requires that, before further flight, you must contact the 
FAA. Then, before further flight, any applicable action specified by 
the FAA must be accomplished in accordance with a method approved by 
the FAA.
    Raytheon Service Bulletin 24-3555, Revision 1, specifies that, on 
certain airplanes equipped with Airshow Cabin Display, the actions in 
Raytheon Service Bulletin 24-3664 must be done concurrently with or 
subsequent to the actions in Part 2 of Raytheon Service Bulletin 24-
3555, Revision 1. We have determined that it is not necessary for this 
proposed AD to require accomplishing Raytheon Service

[[Page 5389]]

Bulletin 24-3664. It is possible to do all of the applicable actions in 
Raytheon Service Bulletin 24-3555, Revision 1, without first doing the 
actions in Raytheon Service Bulletin 24-3664.
    Although the Accomplishment Instructions of Raytheon Service 
Bulletin 24-3555, Revision 1, describe procedures for reporting 
compliance with the service bulletin, this proposed AD would not 
require that action.

Costs of Compliance

    There are about 45 airplanes of the affected design in the 
worldwide fleet. The following table provides the estimated costs for 
U.S. operators to comply with this proposed AD.

                                                                     Estimated Costs
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                                                                                                                          Number of U.S.-
                    Action                       Work hours     Average labor            Parts               Cost per       registered      Fleet cost
                                                                rate per hour                                airplane        airplanes
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Inspection...................................              18             $65  None.....................          $1,170              30         $35,100
Modification.................................               6              65  $435                                  825              30          24,750
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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):

Raytheon Aircraft Company: Docket No. FAA-2005-20251; Directorate 
Identifier 2004-NM-164-AD.

Comments Due Date

    (a) The Federal Aviation Administration (FAA) must receive 
comments on this AD action by March 21, 2005.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Raytheon Model Hawker 800XP airplanes, 
certificated in any category, serial numbers 258541, 258556, and 
258567 through 258608 inclusive.

Unsafe Condition

    (d) This AD was prompted by reports of miswiring in the power 
distribution system. We are issuing this AD to ensure that the 
flightcrew is aware of the source of battery power for certain 
equipment, and to prevent damage to wiring and surrounding equipment 
that could result in smoke or fire on the airplane.

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.

Service Information Reference

    (f) The term ``service bulletin,'' as used in this AD, means 
Raytheon Service Bulletin 24-3555, Revision 1, dated June 2004.
    (1) Where the service bulletin specifies contacting the 
manufacturer for information, this proposed AD requires, before 
further flight, contacting the Manager, Wichita Aircraft 
Certification Office (ACO), FAA. Then, before further flight, any 
applicable action specified by the Manager, Wichita ACO, must be 
accomplished in accordance with a method approved by the Manager, 
Wichita ACO.
    (2) The service bulletin also refers to Raytheon Hawker 800XP 
Temporary Change 140-590032-0005TC7, dated June 3, 2003, which is 
intended to be inserted into the Emergency Procedures section of the 
airplane flight manual to inform the flightcrew which standby 
batteries provide power to what equipment once the actions in the 
service bulletin have been done.
    (3) Where the service bulletin specifies to report compliance 
information to the manufacturer, this AD does not include that 
requirement.

Inspection

    (g) Within 50 flight hours or 30 days after the effective date 
of this AD, whichever is first: Perform a detailed inspection for 
damage (primarily but not limited to evidence of heat damage) of 
wiring in the flight compartment, and all applicable corrective 
actions, by doing all actions in part 1 of the Accomplishment 
Instructions of the service bulletin, except as provided by 
paragraphs (f)(1) and (f)(3) of this AD. Any applicable corrective 
action must be done before further flight.

    Note 1: For the purposes of this AD, a detailed inspection is: 
``An intensive examination of a specific item, installation, or 
assembly to detect damage, failure, or irregularity. Available 
lighting is normally supplemented with a direct source of good 
lighting at an intensity deemed appropriate. Inspection aids such as 
mirror, magnifying lenses, etc., may be necessary. Surface cleaning 
and elaborate procedures may be required.''


[[Page 5390]]



Modification

    (h) At the applicable time specified in paragraph (h)(1) or 
(h)(2) of this AD, modify wiring in the flight compartment by doing 
all actions in accordance with part 2 of the Accomplishment 
Instructions of the service bulletin. Following accomplishment of 
the actions in part 2 of the service bulletin, before further 
flight, do all actions associated with the functional test, 
including revising the Emergency Procedures section of the Raytheon 
Hawker 800XP Airplane Flight Manual to include the information in 
Temporary Change Part Number 140-590032-0005TC7, in accordance with 
the Accomplishment Instructions of the service bulletin.
    (1) If no damage was found during the inspection required by 
paragraph (g) of this AD: Do paragraph (h) within 300 flight hours 
or 180 days after the effective date of this AD, whichever is first.
    (2) If any damage is found during the inspection required by 
paragraph (g) of this AD: Do paragraph (h) before further flight 
after the damage is found.

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 January 26, 2005.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 05-1925 Filed 2-1-05; 8:45 am]
BILLING CODE 4910-13-P