Special Conditions: Learjet Model 35, 35A, 36, and 36A Airplanes; High-Intensity Radiated Fields (HIRF), 2009-2011 [05-557]
Download as PDF
<![CDATA[
Federal Register / Vol. 70, No. 8 / Wednesday, January 12, 2005 / Rules and Regulations
and Budget (OMB), approval number
3150–0017.
Public Protection Notification
NRC may not conduct nor sponsor,
and a person is not required to respond
to, a request for information or an
information collection requirement
unless the requesting document
displays a currently valid OMB control
number.
Regulatory Analysis
In the proposed rule, the Commission
requested public comment on the draft
regulatory analysis specifically on the
costs to licensees. No comments were
received on the draft regulatory
analysis. However, one of the comments
received on the proposed rule indicated
that the cost per unit in most cases will
be substantially greater than NRC’s
estimate. Because a licensee has
flexibility in selecting the physical
controls to be used in securing a
portable gauge, the actual cost would
depend on the controls selected. The
cost per unit could range from $100 for
a metal cable to $400 for a simple metal
tool box, to even a higher cost for a more
elaborately designed metal enclosure. In
the regulatory analysis, an average of
$200 was used.
The Commission has finalized the
regulatory analysis on this regulation.
The analysis examines the costs and
benefits of the alternatives considered
by the Commission. The analysis is
available for inspection in the NRC
Public Document Room, Public File
Area O1F21, One White Flint North,
11555 Rockville Pike, Rockville, MD.
Single copies of the regulatory analysis
are available from Lydia Chang,
telephone (301) 415–6319, e-mail,
lwc1@nrc.gov, of the Office of Nuclear
Material Safety and Safeguards.
Regulatory Flexibility Certification
As required by the Regulatory
Flexibility Act of 1980, 5 U.S.C. 605(b),
the Commission certifies that this rule
will not have a significant economic
impact on a substantial number of small
entities. The final rule would affect
about 1100 portable gauge specific NRC
licensees and an additional 4000
Agreement State specific licensees.
These licenses are issued principally to
companies involved in road
construction and maintenance. Many
portable gauge licensees would qualify
as small business entities as defined by
10 CFR 2.810. However, the final rule is
not expected to have a significant
economic impact on these licensees.
Based on the regulatory analysis
conducted for this action, the costs of
the final rule for affected licensees are
VerDate jul<14>2003
12:16 Jan 11, 2005
Jkt 205001
estimated at $200 per gauge. Among
various alternatives considered, NRC
believes that this final rule is the least
burdensome and most flexible means of
accomplishing NRC’s regulatory
objective. The regulatory analysis also
notes that the requirements would result
in potential cost savings for portable
gauge licensees, particularly for the
replacement of portable gauges due to
unauthorized removal or theft. These
savings would offset the
implementation costs for portable gauge
licensees. The NRC staff also notes that
several Agreement States have imposed
similar or more stringent requirements
on their portable gauge licensees either
by rule, order, or license condition.
In the published proposed rule (68 FR
45172; August 1, 2003), NRC
specifically requested public comment
from licensees concerning the impact of
the proposed regulation because of the
widely differing conditions under
which portable gauge users operate.
NRC particularly was seeking comment
from licensees, who qualify as small
businesses, as to how the proposed
regulation would affect them and how
the regulation may be tiered or
otherwise modified to impose less
stringent requirements on small entities
while still adequately protecting the
public health and safety. However, no
comments were received on these
issues.
Backfit Analysis
NRC has determined that the backfit
rule (§§ 50.109, 70.76, 72.62, or 76.76)
does not apply to this final rule because
this amendment does not involve any
provisions that would impose backfits
as defined in the backfit rule. Therefore,
a backfit analysis is not required.
Small Business Regulatory Enforcement
Fairness Act
In accordance with the Small
Business Regulatory Enforcement
Fairness Act of 1996, NRC has
determined that this action is not a
major rule and has verified this
determination with the Office of
Information and Regulatory Affairs of
OMB.
List of Subjects in 10 CFR Part 30
Byproduct material, Criminal
penalties, Government contracts,
Intergovernmental relations, Isotopes,
Nuclear materials, Radiation protection,
Reporting and recordkeeping
requirements.
I For the reasons set out in the preamble
and under the authority of the Atomic
Energy Act of 1954, as amended; the
Energy Reorganization Act of 1974, as
amended; and 5 U.S.C. 552 and 553, NRC
PO 00000
Frm 00015
Fmt 4700
Sfmt 4700
2009
is adopting the following amendments to
10 CFR part 30.
PART 30—RULES OF GENERAL
APPLICABILITY TO DOMESTIC
LICENSING OF BYPRODUCT
MATERIAL
1. The authority citation for part 30
continues to read as follows:
I
Authority: Secs. 81, 82, 161, 182, 183, 186,
68 Stat. 935, 948, 953, 954, 955, as amended,
sec. 234, 83 Stat. 444, as amended (42 U.S.C.
2111, 2112, 2201, 2232, 2233, 2236, 2282);
secs. 201, as amended, 202, 206, 88 Stat.
1242, as amended, 1244, 1246 (42 U.S.C.
5841, 5842, 5846); sec. 1704, 112 Stat. 2750
(44 U.S.C. 3504 note).
Section 30.7 also issued under Pub. L. 95–
601, sec. 10, 92 Stat. 2951, as amended by
Pub. L. 102–486, sec. 2902, 106 Stat. 3123 (42
U.S.C. 5851). Section 30.34(b) also issued
under sec. 184, 68 Stat. 954, as amended (42
U.S.C. 2234). Section 30.61 also issued under
sec. 187, 68 Stat. 955 (42 U.S.C. 2237).
2. In § 30.34, paragraph (i) is added to
read as follows:
I
§ 30.34
Terms and conditions of licenses.
*
*
*
*
*
(i) Security requirements for portable
gauges.
Each portable gauge licensee shall use
a minimum of two independent
physical controls that form tangible
barriers to secure portable gauges from
unauthorized removal, whenever
portable gauges are not under the
control and constant surveillance of the
licensee.
Dated in Rockville, Maryland, this 6th day
of January, 2005.
For the Nuclear Regulatory Commission.
Annette Vietti-Cook,
Secretary of the Commission.
[FR Doc. 05–590 Filed 1–11–05; 8:45 am]
BILLING CODE 7590–01–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM295; Special Conditions No.
25–280–SC]
Special Conditions: Learjet Model 35,
35A, 36, and 36A Airplanes; HighIntensity Radiated Fields (HIRF)
Federal Aviation
Administration (FAA), DOT.
ACTION: Final special conditions; request
for comments.
AGENCY:
SUMMARY: These special conditions are
issued for Learjet Model 35, 35A, 36,
and 36A airplanes modified by ARINC,
E:\FR\FM\12JAR1.SGM
12JAR1
2010
Federal Register / Vol. 70, No. 8 / Wednesday, January 12, 2005 / Rules and Regulations
Inc. These modified airplanes will have
a novel or unusual design feature when
compared to the state of technology
envisioned in the airworthiness
standards for transport category
airplanes. The modification is the
installation of a Thommen AD32 Air
Data Display Unit (ADDU) which
incorporates a digital air data computer
and altimeter. This equipment will
perform critical functions. The
applicable airworthiness regulations do
not contain adequate or appropriate
safety standards for the protection of
these systems from the effects of highintensity 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 December 23,
2004. Comments must be received on or
before February 11, 2005.
ADDRESSES: Comments on these special
conditions may be mailed in duplicate
to: Federal Aviation Administration,
Transport Airplane Directorate,
Attention: Rules Docket (ANM–113),
Docket No. NM295, 1601 Lind Avenue
SW., Renton, Washington 98055–4056;
or delivered in duplicate to the
Transport Airplane Directorate at the
above address. All comments must be
marked Docket No. NM295.
FOR FURTHER INFORMATION CONTACT: Greg
Dunn, FAA, Airplane and Flight Crew
Interface Branch, ANM–111, Transport
Airplane Directorate, Aircraft
Certification Service, 1601 Lind Avenue
SW., Renton, Washington 98055–4056;
telephone (425) 227–2799; facsimile
(425) 227–1320.
SUPPLEMENTARY INFORMATION:
Comments Invited
The FAA has determined that notice
and opportunity for prior public
comment is impracticable because these
procedures would significantly delay
certification of the airplane 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 upon
issuance; however, we invite interested
persons to participate in this rulemaking
by submitting written comments, data,
or views. The most helpful comments
reference a specific portion of the
special conditions, explain the reason
for any recommended change, and
VerDate jul<14>2003
12:16 Jan 11, 2005
Jkt 205001
include supporting data. We ask that
you send us two copies of written
comments.
We will file in the docket all
comments we receive, as well as a
report summarizing each substantive
public contact with FAA personnel
concerning these special conditions.
The docket is available for public
inspection before and after the comment
closing date. If you wish to review the
docket in person, go to the address in
the ADDRESSES section of this preamble
between 7:30 a.m. and 4 p.m., Monday
through Friday, except Federal holidays.
We will consider all comments we
receive on or before the closing date for
comments. We will consider comments
filed late if it is possible to do so
without incurring expense or delay. We
may change these special conditions
based on the comments we receive.
If you want the FAA to acknowledge
receipt of your comments on these
special conditions, include with your
comments a pre-addressed, stamped
postcard on which the docket number
appears. We will stamp the date on the
postcard and mail it back to you.
Background
On September 27, 2004, ARINC Inc.,
1632 South Murray Blvd., Colorado
Springs, CO 80916 applied for a
supplemental type certificate (STC) to
modify Learjet Model 35, 35A, 36, and
36A airplanes. Learjet Model 35, 35A,
36, and 36A airplanes are currently
approved under Type Certificate No.
A10CE. The Learjet Model 35, 35A, 36,
and 36A airplanes are small transport
category airplanes powered by two
turbojet engines, with maximum takeoff
weights of up to 18,000 pounds. These
airplanes operate with a 2-pilot crew
and can seat up to 8 passengers. The
proposed modification is the
installation of Dual Thommen AD–32
Air Data Display Units. The avionics/
electronics and electrical systems to be
installed in this airplane have the
potential to be vulnerable to highintensity radiated fields (HIRF) external
to the airplane.
Type Certification Basis
Under the provisions of 14 CFR
21.101, ARINC, Inc. must show that the
Learjet Model 35, 35A, 36, and 36A
airplanes, as changed, continue to meet
the applicable provisions of the
regulations incorporated by reference in
Type Certificate No. A10CE 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 original type
PO 00000
Frm 00016
Fmt 4700
Sfmt 4700
certification basis for the Learjet Model
35, 35A, 36, and 36A airplanes includes
14 CFR part 25, as amended by
Amendments 25–2, 25–4, 25–7, 25–18
and § 25.571(d) of Amendment 25–10.
If the Administrator finds that the
applicable airworthiness regulations
(i.e., part 25, as amended) do not
contain adequate or appropriate safety
standards for the Learjet Model 35, 35A,
36, and 36A 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 35, 35A,
36, and 36A 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 defined in 14
CFR 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 ARINC, Inc. apply at
a later date for a supplemental type
certificate to modify any other model
included on Type Certificate No.
A10CE, to incorporate the same or
similar novel or unusual design feature,
these special conditions would also
apply to the other model under the
provisions of § 21.101.
Novel or Unusual Design Features
As noted earlier, the Learjet Model 35,
35A, 36, and 36A airplanes modified by
ARINC, Inc. will incorporate Dual
Thommen AD–32 Air Data Display
Units that will perform critical
functions. These systems may be
vulnerable to high-intensity radiated
fields external to the airplane. The
current airworthiness standards of part
25 do not contain adequate or
appropriate safety standards for the
protection of this equipment from the
adverse effects of HIRF. Accordingly,
this system is considered 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
E:\FR\FM\12JAR1.SGM
12JAR1
Federal Register / Vol. 70, No. 8 / Wednesday, January 12, 2005 / Rules and Regulations
the regulations incorporated by
reference, special conditions are needed
for the Learjet Model 35, 35A, 36, and
36A airplanes modified by ARINC, 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 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.
Frequency
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 ...............
VerDate jul<14>2003
Field strength
(volts per meter)
12:16 Jan 11, 2005
Jkt 205001
50
100
100
50
100
200
200
200
200
The Special Conditions
Accordingly, pursuant to the authority
delegated to me by the Administrator,
the following special conditions are
8 GHz–12 GHz .............
3000
300 issued as part of the supplemental type
12 GHz–18 GHz ...........
2000
200 certification basis for the Learjet Model
18 GHz–40 GHz ...........
600
200 35, 35A, 36, and 36A airplanes modified
The field strengths are expressed in terms by ARINC, Inc.
1. Protection from Unwanted Effects
of peak of the root-mean-square (rms) over
the complete modulation period.
of High-Intensity Radiated Fields
(HIRF). Each electrical and electronic
The threat levels identified above are
system that performs critical functions
the result of an FAA review of existing
must be designed and installed to
studies on the subject of HIRF, in light
ensure that the operation and
of the ongoing work of the
operational capability of these systems
Electromagnetic Effects Harmonization
to perform critical functions are not
Working Group of the Aviation
adversely affected when the airplane is
Rulemaking Advisory Committee.
exposed to high-intensity radiated
Applicability
fields.
2. For the purpose of these special
As discussed above, these special
conditions, the following definition
conditions are applicable to Learjet
applies: Critical Functions: Functions
Model 35, 35A, 36, and 36A airplanes
whose failure would contribute to or
modified by ARINC, Inc. Should
cause a failure condition that would
ARINC, Inc. apply at a later date for a
prevent the continued safe flight and
supplemental type certificate to modify
landing of the airplane.
any other model included on Type
Issued in Renton, Washington, on
Certificate No. A10CE, to incorporate
December 23, 2004.
the same or similar novel or unusual
Kevin Mullin,
design feature, these special conditions
would apply to that model as well
Acting Manager, Transport Airplane
Directorate, Aircraft Certification Service.
under the provisions of § 21.101.
Frequency
Peak
[FR Doc. 05–557 Filed 1–11–05; 8:45 am]
Conclusion
BILLING CODE 4910–13–P
List of Subjects in 14 CFR Part 25
Aircraft, Aviation safety, Reporting
and recordkeeping requirements.
I The authority citation for these special
conditions is as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701,
44702, 44704.
PO 00000
Frm 00017
I
Average
This action affects only certain novel
or unusual design features on Learjet
Model 35, 35A, 36, and 36A airplanes
modified by ARINC, 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. 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
Field strength
unnecessary and impracticable, and
(volts per meter)
good cause exists for adopting these
Peak
Average special conditions upon issuance. The
FAA is requesting comments to allow
50
50 interested persons to submit views that
50
50 may not have been submitted in
50
50
response to the prior opportunities for
100
100
50
50 comment described above.
50
100
100
700
700
2000
3000
3000
1000
2011
Fmt 4700
Sfmt 4700
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 29
Airworthiness Standards: Transport
Category Rotorcraft; Equipment: Flight
and Navigation Instruments;
Correction
Federal Aviation
administration (FAA), DOT.
ACTION: Correcting amendment.
AGENCY:
SUMMARY: This document corrects an
error that appears in the Code of Federal
Regulations (CFR), title 14, as of January
1, 2004. The regulation relates to
attitude-indicating instruments that are
required to be installed on transport
category rotorcraft.
DATES: Effective on January 12, 2005.
FOR FURTHER INFORMATION CONTACT:
Terry Pearsall, phone (202) 267–3042.
SUPPLEMENTARY INFORMATION:
Need for Correction
As published in the CFR, these
regulations contain errors in which the
word ‘‘altitude’’ was incorrectly
substituted for the word ‘‘attitude’’.
Accordingly, § 29.1303(g) of 14 CFR part
I
E:\FR\FM\12JAR1.SGM
12JAR1
]]>Agencies
[Federal Register Volume 70, Number 8 (Wednesday, January 12, 2005)]
[Rules and Regulations]
[Pages 2009-2011]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 05-557]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM295; Special Conditions No. 25-280-SC]
Special Conditions: Learjet Model 35, 35A, 36, and 36A 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 for Learjet Model 35, 35A,
36, and 36A airplanes modified by ARINC,
[[Page 2010]]
Inc. These modified airplanes will have a novel or unusual design
feature when compared to the state of technology envisioned in the
airworthiness standards for transport category airplanes. The
modification is the installation of a Thommen AD32 Air Data Display
Unit (ADDU) which incorporates a digital air data computer and
altimeter. This equipment will perform critical functions. 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 December 23,
2004. Comments must be received on or before February 11, 2005.
ADDRESSES: Comments on these special conditions may be mailed in
duplicate to: Federal Aviation Administration, Transport Airplane
Directorate, Attention: Rules Docket (ANM-113), Docket No. NM295, 1601
Lind Avenue SW., Renton, Washington 98055-4056; or delivered in
duplicate to the Transport Airplane Directorate at the above address.
All comments must be marked Docket No. NM295.
FOR FURTHER INFORMATION CONTACT: Greg Dunn, FAA, Airplane and Flight
Crew Interface Branch, ANM-111, Transport Airplane Directorate,
Aircraft Certification Service, 1601 Lind Avenue SW., Renton,
Washington 98055-4056; telephone (425) 227-2799; facsimile (425) 227-
1320.
SUPPLEMENTARY INFORMATION:
Comments Invited
The FAA has determined that notice and opportunity for prior public
comment is impracticable because these procedures would significantly
delay certification of the airplane 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 upon
issuance; however, we invite interested persons to participate in this
rulemaking by submitting written comments, data, or views. The most
helpful comments reference a specific portion of the special
conditions, explain the reason for any recommended change, and include
supporting data. We ask that you send us two copies of written
comments.
We will file in the docket all comments we receive, as well as a
report summarizing each substantive public contact with FAA personnel
concerning these special conditions. The docket is available for public
inspection before and after the comment closing date. If you wish to
review the docket in person, go to the address in the ADDRESSES section
of this preamble between 7:30 a.m. and 4 p.m., Monday through Friday,
except Federal holidays.
We will consider all comments we receive on or before the closing
date for comments. We will consider comments filed late if it is
possible to do so without incurring expense or delay. We may change
these special conditions based on the comments we receive.
If you want the FAA to acknowledge receipt of your comments on
these special conditions, include with your comments a pre-addressed,
stamped postcard on which the docket number appears. We will stamp the
date on the postcard and mail it back to you.
Background
On September 27, 2004, ARINC Inc., 1632 South Murray Blvd.,
Colorado Springs, CO 80916 applied for a supplemental type certificate
(STC) to modify Learjet Model 35, 35A, 36, and 36A airplanes. Learjet
Model 35, 35A, 36, and 36A airplanes are currently approved under Type
Certificate No. A10CE. The Learjet Model 35, 35A, 36, and 36A airplanes
are small transport category airplanes powered by two turbojet engines,
with maximum takeoff weights of up to 18,000 pounds. These airplanes
operate with a 2-pilot crew and can seat up to 8 passengers. The
proposed modification is the installation of Dual Thommen AD-32 Air
Data Display Units. The avionics/electronics and electrical systems to
be installed in this airplane have the potential to be vulnerable to
high-intensity radiated fields (HIRF) external to the airplane.
Type Certification Basis
Under the provisions of 14 CFR 21.101, ARINC, Inc. must show that
the Learjet Model 35, 35A, 36, and 36A airplanes, as changed, continue
to meet the applicable provisions of the regulations incorporated by
reference in Type Certificate No. A10CE 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 original type
certification basis for the Learjet Model 35, 35A, 36, and 36A
airplanes includes 14 CFR part 25, as amended by Amendments 25-2, 25-4,
25-7, 25-18 and Sec. 25.571(d) of Amendment 25-10.
If the Administrator finds that the applicable airworthiness
regulations (i.e., part 25, as amended) do not contain adequate or
appropriate safety standards for the Learjet Model 35, 35A, 36, and 36A
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 35, 35A, 36, and 36A 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 defined in 14 CFR 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 ARINC, Inc. apply at a later date for a
supplemental type certificate to modify any other model included on
Type Certificate No. A10CE, to incorporate the same or 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
As noted earlier, the Learjet Model 35, 35A, 36, and 36A airplanes
modified by ARINC, Inc. will incorporate Dual Thommen AD-32 Air Data
Display Units that will perform critical functions. These systems may
be vulnerable to high-intensity radiated fields external to the
airplane. The current airworthiness standards of part 25 do not contain
adequate or appropriate safety standards for the protection of this
equipment from the adverse effects of HIRF. Accordingly, this system is
considered 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
[[Page 2011]]
the regulations incorporated by reference, special conditions are
needed for the Learjet Model 35, 35A, 36, and 36A airplanes modified by
ARINC, 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 35, 35A, 36, and 36A airplanes modified by ARINC, Inc.
Should ARINC, Inc. apply at a later date for a supplemental type
certificate to modify any other model included on Type Certificate No.
A10CE, to incorporate the same or similar 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 Learjet Model 35, 35A, 36, and 36A airplanes modified by ARINC, 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.
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 25
Aircraft, Aviation safety, Reporting and recordkeeping
requirements.
0
The authority citation for these special conditions is as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701, 44702, 44704.
The Special Conditions
0
Accordingly, pursuant to the authority delegated to me by the
Administrator, the following special conditions are issued as part of
the supplemental type certification basis for the Learjet Model 35,
35A, 36, and 36A airplanes modified by ARINC, 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 Renton, Washington, on December 23, 2004.
Kevin Mullin,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 05-557 Filed 1-11-05; 8:45 am]
BILLING CODE 4910-13-P
