Special Conditions: Avcon Industries, Inc.; Learjet Model 23 Series Airplanes; High-Intensity Radiated Fields (HIRF), 49987-49989 [E6-13995]
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Federal Register / Vol. 71, No. 164 / Thursday, August 24, 2006 / Rules and Regulations
for conducting producer referenda and 7
CFR part 717 is obsolete.
Executive Order 12866
This rule related to internal agency
management. Therefore, pursuant to 5
U.S.C. 553, notice of proposed
rulemaking and opportunity for
comment are not required, and this rule
may be made effective less than 30 days
after publication in the Federal
Register. Further, because this rule
relates to internal agency management,
it is exempt from the provisions of
Executive Order Nos. 12291 and 12866.
Finally, this action is not a rule as
defined by the Regulatory Flexibility
Act, 5 U.S.C. 601, et seq., and is
therefore exempt from the provisions of
that Act. Accordingly, as authorized by
section 808 of the Small Business
Regulatory Enforcement Fairness Act of
1996, 5 U.S.C. 808, this rule may be
made effective upon publication.
Paperwork Reduction Act
This rule does not affect any
information collections.
List of Subjects in 7 CFR Part 717
Agricultural Commodities,
Allotments, Price support programs,
Quotas, Tobacco.
PART 717—[REMOVED]
Accordingly, under the authority of 5
U.S.C. 301, 7 CFR Chapter VII is
amended by removing part 717.
I
Signed at Washington, DC on August 9,
2006.
Teresa C. Lasseter,
Administrator, Farm Service Agency.
[FR Doc. 06–7159 Filed 8–23–06; 8:45 am]
BILLING CODE 3410–05–M
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 23
[Docket No. CE258; Special Conditions No.
23–198–SC]
Special Conditions: Avcon Industries,
Inc.; Learjet Model 23 Series Airplanes;
High-Intensity Radiated Fields (HIRF)
Federal Aviation
Administration (FAA), DOT.
ACTION: Final special conditions; request
for comments.
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AGENCY:
SUMMARY: These special conditions are
issued to Avcon Industries, Inc., for the
Learjet Model 23 series airplanes
modified by Avcon Industries, Inc. This
airplane as modified by Avcon
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15:14 Aug 23, 2006
Jkt 208001
Industries, Inc., will have a novel or
unusual design feature associated with
the installation of a new Reduced
Vertical Separation Minimum (RVSM)
air data system. The applicable
airworthiness regulations do not contain
adequate or appropriate safety standards
for the protection of these systems from
the effects of high-intensity radiated
fields (HIRF). These special conditions
contain the additional safety standards
that the Administrator considers
necessary to establish a level of safety
equivalent to that established by the
existing airworthiness standards.
DATES: The effective date of these
special conditions is August 17, 2006.
Comments must be received on or
before September 25, 2006.
ADDRESSES: Comments on these special
conditions may be mailed in duplicate
to: Federal Aviation Administration,
Regional Counsel, ACE–7, Attention:
Rules Docket CE258, 901 Locust, Room
506, Kansas City, Missouri 64106 or
delivered in duplicate to the Regional
Counsel at the above address.
Comments must be marked: CE258.
Comments may be inspected in the
Rules Docket weekdays, except Federal
holidays, between 7:30 a.m. and 4 p.m.
FOR FURTHER INFORMATION CONTACT:
Ervin Dvorak, Federal Aviation
Administration, Aircraft Certification
Service, Small Airplane Directorate,
ACE–111, 901 Locust, Room 301,
Kansas City, Missouri 64106; 816–329–
4123; fax 816–329–4090.
SUPPLEMENTARY INFORMATION:
The FAA has determined that notice
and opportunity for prior public
comment hereon are impracticable
because these procedures would
significantly delay issuance of the
approval design and thus delivery of the
affected aircraft. In addition, the
substance of these special conditions
has been subject to the public comment
process in several prior instances with
no substantive comments received. The
FAA therefore finds that good cause
exists for making these special
conditions effective on issuance.
Comments Invited
Interested persons are invited to
submit such written data, views, or
arguments as they may desire.
Communications should identify the
regulatory docket or special condition
number and be submitted in duplicate
to the address specified above. All
communications received on or before
the closing date for comments will be
considered by the Administrator. The
special conditions may be changed in
light of the comments received. All
comments received will be available in
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49987
the Rules Docket for examination by
interested persons, both before and after
the closing date for comments. A report
summarizing each substantive public
contact with FAA personnel concerning
this rulemaking will be filed in the
docket. Commenters wishing the FAA to
acknowledge receipt of their comments
submitted in response to this notice
must include a self-addressed, stamped
postcard on which the following
statement is made: ‘‘Comments to
CE258.’’ The postcard will be date
stamped and returned to the
commenter.
Background
On June 26, 2006, Avcon Industries,
Inc.; P.O. Box 748; Newton, Kansas
67114, applied for a supplemental type
certificate (STC) to modify Learjet
Model 23 series airplanes currently
approved under Type Certificate (TC)
No. A5CE. The Learjet 23 series
airplanes are normal category airplanes
powered by two turbojet engines, with
a maximum takeoff weight of 12,500
pounds. These airplanes operate with a
2-person crew and can seat up to 8
passengers. The proposed modification
is the installation of an Innovative
Solutions & Support Air Data Display
Units and Analog Interface Unit. The
avionics/electronics and electrical
systems installed in this airplane have
the potential to be vulnerable to HIRF
external to the airplane.
Type Certification Basis
Under the provisions of § 21.101,
Avcon Industries, Inc., must show that
the Learjet Model 23 series airplanes, as
changed, continue to meet the
applicable provisions of the regulations
incorporated by reference in Type
Certificate No. A5CE, or the applicable
regulations in effect on the date of
application for the change. The
regulations incorporated by reference in
the type certificate are commonly
referred to as the ‘‘original type
certification basis.’’ The regulations
incorporated by reference in the Type
Certificate No. A5CE for the Learjet
Model 23 series airplanes includes Civil
Air Regulations (CAR), part 3, effective
May 15, 1956, as amended by
Amendments 3–1 through 3–8, plus
special conditions set forth in FAA
letter to Learjet, dated November 12,
1963, and Amendment No. 1, dated July
31, 1964, and No. 2, dated March 14,
1966, and Exception No. 352 from
compliance with CAR 3.74(a)(2) and (3)
for ground operation at a maximum
weight of 12,750 pounds.
If the Administrator finds that the
applicable airworthiness regulations
(i.e., part 23, as amended) do not
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24AUR1
49988
Federal Register / Vol. 71, No. 164 / Thursday, August 24, 2006 / Rules and Regulations
contain adequate or appropriate safety
standards for the Learjet Model 23 series
airplanes because of a novel or unusual
design feature, special conditions are
prescribed under the provisions of
§ 21.16.
In addition to the applicable
airworthiness regulations and special
conditions, the Learjet Model 23 series
airplanes must comply with the fuel
vent and exhaust emission requirements
of 14 CFR part 34 and the noise
certification requirements of 14 CFR
part 36.
Special conditions, as appropriate, as
defined in § 11.19, are issued in
accordance with § 11.38, and become
part of the type certification basis in
accordance with § 21.101.
Special conditions are initially
applicable to the model for which they
are issued. Should Avcon Industries,
Inc., apply for a supplemental type
certificate to modify any other model
included on TC No. A5CE to incorporate
the same or a similar novel or unusual
design feature, these special conditions
would also apply to the other model
under the provisions of § 21.101.
rmajette on PROD1PC67 with RULES1
Novel or Unusual Design Features
The Learjet Model 23 series airplanes,
as modified by Avcon Industries, Inc.,
will incorporate an Innovative Solutions
& Support Air Data Display Units and
Analog Interface Unit. The Innovative
Solutions & Support Air Data Display
Units and Analog Interface Unit perform
critical functions. These systems may be
vulnerable to HIRF external to the
airplane. The current airworthiness
standards of part 23 do not contain
adequate or appropriate safety standards
for the protection of this equipment
from the adverse effects of HIRF.
Therefore, we consider this system to be
a novel or unusual design feature.
Discussion
There is no specific regulation that
addresses protection requirements for
electrical and electronic systems from
HIRF. Increased power levels from
ground-based radio transmitters and the
growing use of sensitive avionics/
electronics and electrical systems to
command and control airplanes have
made it necessary to provide adequate
protection.
To ensure that a level of safety is
achieved equivalent to that intended by
the regulations incorporated by
reference, special conditions are needed
for the Learjet Model 23 series airplanes
as modified by Avcon Industries, Inc.
These special conditions require that
new avionics/electronics and electrical
systems that perform critical functions
be designed and installed to preclude
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15:14 Aug 23, 2006
Jkt 208001
component damage and interruption of
function due to both the direct and
indirect effects of HIRF.
Frequency
Field strength
(volts per meter)
Peak
Average
High-Intensity Radiated Fields (HIRF)
With the trend toward increased
power levels from ground-based
transmitters, and the advent of space
and satellite communications, coupled
with electronic command and control of
the airplane, the immunity of critical
avionics/electronics and electrical
systems to HIRF must be established.
It is not possible to precisely define
the HIRF to which the airplane will be
exposed in service. There is also
uncertainty concerning the effectiveness
of airframe shielding for HIRF.
Furthermore, coupling of
electromagnetic energy to cockpitinstalled equipment through the cockpit
window apertures is undefined. Based
on surveys and analysis of existing HIRF
emitters, an adequate level of protection
exists when compliance with the HIRF
protection special condition is shown
with either paragraph 1 or 2 below:
1. A minimum threat of 100 volts rms
(root-mean-square) per meter electric
field strength from 10 KHz to 18 GHz.
a. The threat must be applied to the
system elements and their associated
wiring harnesses without the benefit of
airframe shielding.
b. Demonstration of this level of
protection is established through system
tests and analysis.
2. A threat external to the airframe of
the field strengths identified in the table
below for the frequency ranges
indicated. Both peak and average field
strength components from the table are
to be demonstrated.
Field strength
(volts per meter)
Frequency
Peak
10 kHz–100 kHz
100 kHz–500
kHz ................
500 kHz–2 MHz
2 MHz–30 MHz
30 MHz–70 MHz
70 MHz–100
MHz ...............
100 MHz–200
MHz ...............
200 MHz–400
MHz ...............
400 MHz–700
MHz ...............
700 MHz–1 GHz
1 GHz–2 GHz ...
2 GHz–4 GHz ...
4 GHz–6 GHz ...
6 GHz–8 GHz ...
8 GHz–12 GHz
12 GHz–18 GHz
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Fmt 4700
Average
18 GHz–40 GHz
600
200
The field strengths are expressed in terms
of peak of the root-mean-square (rms) over
the complete modulation period.
The threat levels identified above are
the result of an FAA review of existing
studies on the subject of HIRF, in light
of the ongoing work of the
Electromagnetic Effects Harmonization
Working Group of the Aviation
Rulemaking Advisory Committee.
Applicability
As discussed above, these special
conditions are applicable to Learjet
Model 23 series airplanes modified by
Avcon Industries, Inc. Should Avcon
Industries, Inc., apply later for an STC
to modify any other model included on
TC No. A5CE to incorporate the same
novel or unusual design feature, these
special conditions would apply to that
model as well under the provisions of
§ 21.101.
Conclusion
This action affects only certain novel
or unusual design features on the Learjet
23 series airplanes modified by Avcon
Industries, Inc. It is not a rule of general
applicability and affects only the
applicant who applied to the FAA for
approval of these features on the
airplane.
The substance of these special
conditions has been subjected to the
notice and comment procedure in
several prior instances and has been
derived without substantive change
from those previously issued. It is
unlikely that prior public comment
would result in a significant change
from the substance contained herein.
For this reason, and because a delay
would significantly affect the
certification of the airplane, which is
imminent, the FAA has determined that
prior public notice and comment are
unnecessary and impracticable, and
good cause exists for adopting these
special conditions upon issuance. The
FAA is requesting comments to allow
interested persons to submit views that
may not have been submitted in
response to the prior opportunities for
comment described above.
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List of Subjects in 14 CFR Part 23
Aircraft, Aviation safety, Signs and
symbols.
Citation
The authority citation for these
special conditions is as follows:
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Federal Register / Vol. 71, No. 164 / Thursday, August 24, 2006 / Rules and Regulations
Authority: 49 U.S.C. 106(g); 40113, and
44701; 14 CFR 21.16 and 21.101; and 14 CFR
11.38 and 11.19.
The Special Conditions
Accordingly, pursuant to the
authority delegated to me by the
Administrator, the following special
conditions are issued as part of the type
certification basis for the Learjet Model
23 series airplanes modified by Avcon
Industries, Inc.
1. Protection from Unwanted Effects
of High-Intensity Radiated Fields
(HIRF). Each electrical and electronic
system that performs critical functions
must be designed and installed to
ensure that the operation and
operational capability of these systems
to perform critical functions are not
adversely affected when the airplane is
exposed to high-intensity radiated
fields.
2. For the purpose of these special
conditions, the following definition
applies:
Critical Functions: Functions whose
failure would contribute to or cause a
failure condition that would prevent the
continued safe flight and landing of the
airplane.
Issued in Kansas City, Missouri on August
17, 2006.
David R. Showers,
Acting Manager, Small Airplane Directorate,
Aircraft Certification Service.
[FR Doc. E6–13995 Filed 8–23–06; 8:45 am]
BILLING CODE 4910–13–P
NATIONAL AERONAUTICS AND
SPACE ADMINISTRATION
14 CFR Part 1213
Notice: (06–060)
RIN 2700–AD25
Release of Information to News and
Information Media
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Effective Date: August 24, 2006.
R.
Andrew Falcon, Associate General
Counsel, General Law Practice Group,
Office of the General Counsel, NASA
VerDate Aug<31>2005
15:14 Aug 23, 2006
Jkt 208001
PART 1213—RELEASE OF
INFORMATION TO NEWS AND
INFORMATION MEDIA
Sec.
1213.100 Scope.
1213.101 Applicability.
1213.102 Policy.
1213.103 Responsibilities.
1213.104 Public information coordination
and concurrence.
1213.105 Interviews.
1213.106 Preventing release of classified
information to the media.
1213.107 Preventing unauthorized release
of sensitive but unclassified (SBU)
information/material to the news media.
1213.108 Multimedia materials.
1213.109 News releases concerning
international activities.
§ 1213.100
SUMMARY: The National Aeronautics and
Space Administration (NASA) is
amending NASA regulations on release
of information to news and information
media. These amendments will
establish NASA policy, responsibility,
and procedure for providing
information to news media on NASA
activities.
FOR FURTHER INFORMATION CONTACT:
List of Subjects in 14 CFR Part 1213
Administrative practice and
procedure, News media.
I For the reasons set out in the
preamble, NASA revises part 1213 of
title 14 of the Code of Federal
Regulations to read as follows:
Authority: 42 U.S.C. 2473(a)(3).
National Aeronautics and
Space Administration.
ACTION: Final rule.
AGENCY:
DATES:
Headquarters, telephone (202) 358–
2465, fax (202) 358–4355.
SUPPLEMENTARY INFORMATION: These
amendments set forth procedures for
internal review of public information,
updates the designations of officials
responsible for the accuracy of
information contained in press releases
and other forms of public information,
and provides guidance to employees on
authorities governing the release of
information. Since this action concerns
matters of internal Agency organization,
practice, and procedure, no public
comment period is required, and this
rule becomes effective on the date of
publication. This rule is not subject to
the Regulatory Flexibility Act (5 U.S.C.
chapter 6) since it will not have a
significant impact on a substantial
number of small entities. Finally, this
rule is not a major Federal action as
defined in Executive Order 12866.
Scope.
This part sets forth policy governing
the release of public information, which
is defined as information in any form
provided to news and information
media, especially information that has
the potential to generate significant
media or public interest or inquiry.
Examples include, but are not limited
to, press releases, media advisories,
news features, and Web postings. Not
included under this definition are
scientific and technical reports, Web
postings designed for technical or
scientific interchange, and technical
information presented at professional
meetings or in professional journals.
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§ 1213.101
49989
Applicability.
(a) This policy applies to NASA
Headquarters, NASA Centers, and
Component Facilities.
(b) In the event of any conflict
between this policy and any other
NASA policy, directive, or regulation,
this policy shall govern and supersede
any previous issuance or directive.
(c) The requirements of this part do
not apply to the Office of Inspector
General regarding its activities.
§ 1213.102
Policy.
(a) NASA, a scientific and technical
Agency, is committed to a culture of
openness with the media and public
that values the free exchange of ideas,
data, and information as part of
scientific and technical inquiry.
Scientific and technical information
from or about Agency programs and
projects will be accurate and unfiltered.
(b) Consistent with NASA statutory
responsibility, NASA will ‘‘provide for
the widest practicable and appropriate
dissemination of information
concerning its activities and the results
thereof.’’ Release of public information
concerning NASA activities and the
results of NASA activities will be made
in a timely, equitable, accurate, and
complete manner.
(c) To ensure timely release of
information, NASA will endeavor to
ensure cooperation and coordination
among the Agency’s scientific,
engineering, and public affairs
communities.
(d) In keeping with the desire for a
culture of openness, NASA employees
may, consistent with this policy, speak
to the press and the public about their
work.
(e) This policy does not authorize or
require disclosure of information that is
exempt from disclosure under the
Freedom of Information Act (5 U.S.C.
552) or otherwise restricted by statute,
regulation, Executive Order, or other
Executive Branch policy or NASA
policy (e.g., OMB Circulars, NASA
Policy Directives). Examples of
information not releasable under this
policy include, without limitation,
information that is, or is marked as,
classified information, procurement
sensitive information, information
subject to the Privacy Act, other
sensitive but unclassified information,
and information subject to privilege,
such as pre-decisional information or
attorney-client communications.
§ 1213.103
Responsibilities.
(a) The Assistant Administrator for
Public Affairs is responsible for
developing and administering an
integrated Agency-wide
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]]>Agencies
[Federal Register Volume 71, Number 164 (Thursday, August 24, 2006)]
[Rules and Regulations]
[Pages 49987-49989]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E6-13995]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 23
[Docket No. CE258; Special Conditions No. 23-198-SC]
Special Conditions: Avcon Industries, Inc.; Learjet Model 23
Series Airplanes; High-Intensity Radiated Fields (HIRF)
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final special conditions; request for comments.
-----------------------------------------------------------------------
SUMMARY: These special conditions are issued to Avcon Industries, Inc.,
for the Learjet Model 23 series airplanes modified by Avcon Industries,
Inc. This airplane as modified by Avcon Industries, Inc., will have a
novel or unusual design feature associated with the installation of a
new Reduced Vertical Separation Minimum (RVSM) air data system. The
applicable airworthiness regulations do not contain adequate or
appropriate safety standards for the protection of these systems from
the effects of high-intensity radiated fields (HIRF). These special
conditions contain the additional safety standards that the
Administrator considers necessary to establish a level of safety
equivalent to that established by the existing airworthiness standards.
DATES: The effective date of these special conditions is August 17,
2006. Comments must be received on or before September 25, 2006.
ADDRESSES: Comments on these special conditions may be mailed in
duplicate to: Federal Aviation Administration, Regional Counsel, ACE-7,
Attention: Rules Docket CE258, 901 Locust, Room 506, Kansas City,
Missouri 64106 or delivered in duplicate to the Regional Counsel at the
above address. Comments must be marked: CE258. Comments may be
inspected in the Rules Docket weekdays, except Federal holidays,
between 7:30 a.m. and 4 p.m.
FOR FURTHER INFORMATION CONTACT: Ervin Dvorak, Federal Aviation
Administration, Aircraft Certification Service, Small Airplane
Directorate, ACE-111, 901 Locust, Room 301, Kansas City, Missouri
64106; 816-329-4123; fax 816-329-4090.
SUPPLEMENTARY INFORMATION:
The FAA has determined that notice and opportunity for prior public
comment hereon are impracticable because these procedures would
significantly delay issuance of the approval design and thus delivery
of the affected aircraft. In addition, the substance of these special
conditions has been subject to the public comment process in several
prior instances with no substantive comments received. The FAA
therefore finds that good cause exists for making these special
conditions effective on issuance.
Comments Invited
Interested persons are invited to submit such written data, views,
or arguments as they may desire. Communications should identify the
regulatory docket or special condition number and be submitted in
duplicate to the address specified above. All communications received
on or before the closing date for comments will be considered by the
Administrator. The special conditions may be changed in light of the
comments received. All comments received will be available in the Rules
Docket for examination by interested persons, both before and after the
closing date for comments. A report summarizing each substantive public
contact with FAA personnel concerning this rulemaking will be filed in
the docket. Commenters wishing the FAA to acknowledge receipt of their
comments submitted in response to this notice must include a self-
addressed, stamped postcard on which the following statement is made:
``Comments to CE258.'' The postcard will be date stamped and returned
to the commenter.
Background
On June 26, 2006, Avcon Industries, Inc.; P.O. Box 748; Newton,
Kansas 67114, applied for a supplemental type certificate (STC) to
modify Learjet Model 23 series airplanes currently approved under Type
Certificate (TC) No. A5CE. The Learjet 23 series airplanes are normal
category airplanes powered by two turbojet engines, with a maximum
takeoff weight of 12,500 pounds. These airplanes operate with a 2-
person crew and can seat up to 8 passengers. The proposed modification
is the installation of an Innovative Solutions & Support Air Data
Display Units and Analog Interface Unit. The avionics/electronics and
electrical systems installed in this airplane have the potential to be
vulnerable to HIRF external to the airplane.
Type Certification Basis
Under the provisions of Sec. 21.101, Avcon Industries, Inc., must
show that the Learjet Model 23 series airplanes, as changed, continue
to meet the applicable provisions of the regulations incorporated by
reference in Type Certificate No. A5CE, or the applicable regulations
in effect on the date of application for the change. The regulations
incorporated by reference in the type certificate are commonly referred
to as the ``original type certification basis.'' The regulations
incorporated by reference in the Type Certificate No. A5CE for the
Learjet Model 23 series airplanes includes Civil Air Regulations (CAR),
part 3, effective May 15, 1956, as amended by Amendments 3-1 through 3-
8, plus special conditions set forth in FAA letter to Learjet, dated
November 12, 1963, and Amendment No. 1, dated July 31, 1964, and No. 2,
dated March 14, 1966, and Exception No. 352 from compliance with CAR
3.74(a)(2) and (3) for ground operation at a maximum weight of 12,750
pounds.
If the Administrator finds that the applicable airworthiness
regulations (i.e., part 23, as amended) do not
[[Page 49988]]
contain adequate or appropriate safety standards for the Learjet Model
23 series airplanes because of a novel or unusual design feature,
special conditions are prescribed under the provisions of Sec. 21.16.
In addition to the applicable airworthiness regulations and special
conditions, the Learjet Model 23 series airplanes must comply with the
fuel vent and exhaust emission requirements of 14 CFR part 34 and the
noise certification requirements of 14 CFR part 36.
Special conditions, as appropriate, as defined in Sec. 11.19, are
issued in accordance with Sec. 11.38, and become part of the type
certification basis in accordance with Sec. 21.101.
Special conditions are initially applicable to the model for which
they are issued. Should Avcon Industries, Inc., apply for a
supplemental type certificate to modify any other model included on TC
No. A5CE to incorporate the same or a similar novel or unusual design
feature, these special conditions would also apply to the other model
under the provisions of Sec. 21.101.
Novel or Unusual Design Features
The Learjet Model 23 series airplanes, as modified by Avcon
Industries, Inc., will incorporate an Innovative Solutions & Support
Air Data Display Units and Analog Interface Unit. The Innovative
Solutions & Support Air Data Display Units and Analog Interface Unit
perform critical functions. These systems may be vulnerable to HIRF
external to the airplane. The current airworthiness standards of part
23 do not contain adequate or appropriate safety standards for the
protection of this equipment from the adverse effects of HIRF.
Therefore, we consider this system to be a novel or unusual design
feature.
Discussion
There is no specific regulation that addresses protection
requirements for electrical and electronic systems from HIRF. Increased
power levels from ground-based radio transmitters and the growing use
of sensitive avionics/electronics and electrical systems to command and
control airplanes have made it necessary to provide adequate
protection.
To ensure that a level of safety is achieved equivalent to that
intended by the regulations incorporated by reference, special
conditions are needed for the Learjet Model 23 series airplanes as
modified by Avcon Industries, Inc. These special conditions require
that new avionics/electronics and electrical systems that perform
critical functions be designed and installed to preclude component
damage and interruption of function due to both the direct and indirect
effects of HIRF.
High-Intensity Radiated Fields (HIRF)
With the trend toward increased power levels from ground-based
transmitters, and the advent of space and satellite communications,
coupled with electronic command and control of the airplane, the
immunity of critical avionics/electronics and electrical systems to
HIRF must be established.
It is not possible to precisely define the HIRF to which the
airplane will be exposed in service. There is also uncertainty
concerning the effectiveness of airframe shielding for HIRF.
Furthermore, coupling of electromagnetic energy to cockpit-installed
equipment through the cockpit window apertures is undefined. Based on
surveys and analysis of existing HIRF emitters, an adequate level of
protection exists when compliance with the HIRF protection special
condition is shown with either paragraph 1 or 2 below:
1. A minimum threat of 100 volts rms (root-mean-square) per meter
electric field strength from 10 KHz to 18 GHz.
a. The threat must be applied to the system elements and their
associated wiring harnesses without the benefit of airframe shielding.
b. Demonstration of this level of protection is established through
system tests and analysis.
2. A threat external to the airframe of the field strengths
identified in the table below for the frequency ranges indicated. Both
peak and average field strength components from the table are to be
demonstrated.
------------------------------------------------------------------------
Field strength (volts
per meter)
Frequency -------------------------
Peak Average
------------------------------------------------------------------------
10 kHz-100 kHz................................ 50 50
100 kHz-500 kHz............................... 50 50
500 kHz-2 MHz................................. 50 50
2 MHz-30 MHz.................................. 100 100
30 MHz-70 MHz................................. 50 50
70 MHz-100 MHz................................ 50 50
100 MHz-200 MHz............................... 100 100
200 MHz-400 MHz............................... 100 100
400 MHz-700 MHz............................... 700 50
700 MHz-1 GHz................................. 700 100
1 GHz-2 GHz................................... 2000 200
2 GHz-4 GHz................................... 3000 200
4 GHz-6 GHz................................... 3000 200
6 GHz-8 GHz................................... 1000 200
8 GHz-12 GHz.................................. 3000 300
12 GHz-18 GHz................................. 2000 200
18 GHz-40 GHz................................. 600 200
------------------------------------------------------------------------
The field strengths are expressed in terms of peak of the root-mean-
square (rms) over the complete modulation period.
The threat levels identified above are the result of an FAA review
of existing studies on the subject of HIRF, in light of the ongoing
work of the Electromagnetic Effects Harmonization Working Group of the
Aviation Rulemaking Advisory Committee.
Applicability
As discussed above, these special conditions are applicable to
Learjet Model 23 series airplanes modified by Avcon Industries, Inc.
Should Avcon Industries, Inc., apply later for an STC to modify any
other model included on TC No. A5CE to incorporate the same novel or
unusual design feature, these special conditions would apply to that
model as well under the provisions of Sec. 21.101.
Conclusion
This action affects only certain novel or unusual design features
on the Learjet 23 series airplanes modified by Avcon Industries, Inc.
It is not a rule of general applicability and affects only the
applicant who applied to the FAA for approval of these features on the
airplane.
The substance of these special conditions has been subjected to the
notice and comment procedure in several prior instances and has been
derived without substantive change from those previously issued. It is
unlikely that prior public comment would result in a significant change
from the substance contained herein. For this reason, and because a
delay would significantly affect the certification of the airplane,
which is imminent, the FAA has determined that prior public notice and
comment are unnecessary and impracticable, and good cause exists for
adopting these special conditions upon issuance. The FAA is requesting
comments to allow interested persons to submit views that may not have
been submitted in response to the prior opportunities for comment
described above.
List of Subjects in 14 CFR Part 23
Aircraft, Aviation safety, Signs and symbols.
Citation
The authority citation for these special conditions is as follows:
[[Page 49989]]
Authority: 49 U.S.C. 106(g); 40113, and 44701; 14 CFR 21.16 and
21.101; and 14 CFR 11.38 and 11.19.
The Special Conditions
Accordingly, pursuant to the authority delegated to me by the
Administrator, the following special conditions are issued as part of
the type certification basis for the Learjet Model 23 series airplanes
modified by Avcon Industries, Inc.
1. Protection from Unwanted Effects of High-Intensity Radiated
Fields (HIRF). Each electrical and electronic system that performs
critical functions must be designed and installed to ensure that the
operation and operational capability of these systems to perform
critical functions are not adversely affected when the airplane is
exposed to high-intensity radiated fields.
2. For the purpose of these special conditions, the following
definition applies:
Critical Functions: Functions whose failure would contribute to or
cause a failure condition that would prevent the continued safe flight
and landing of the airplane.
Issued in Kansas City, Missouri on August 17, 2006.
David R. Showers,
Acting Manager, Small Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E6-13995 Filed 8-23-06; 8:45 am]
BILLING CODE 4910-13-P
