Special Conditions: Cessna Model 650 Airplanes; High-Intensity Radiated Fields (HIRF), 69053-69055 [05-22521]
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Federal Register / Vol. 70, No. 218 / Monday, November 14, 2005 / Rules and Regulations
which it, together with its affiliates, is
engaged, or if it meets the size standard
set forth in paragraph (d)(1), whichever
is higher.
*
*
*
*
*
Dated: November 8, 2005.
Hector V. Barreto,
Administrator.
[FR Doc. 05–22570 Filed 11–10–05; 8:45 am]
BILLING CODE 8025–01–P
DEPARTMENT OF COMMERCE
Economic Development Administration
13 CFR Parts 301 and 304
[Docket No.: 0507–29210–5294–03]
RIN 0610–AA63
Economic Development Administration
Reauthorization Act of 2004
Implementation; Regulatory Revision
Economic Development
Administration, Department of
Commerce.
ACTION: Final rule; delay of effective
date of certain provisions.
AGENCY:
On August 11, 2005, the
Economic Development Administration
(‘‘EDA’’) published an interim final rule
in the Federal Register. On September
30, 2005, EDA published a final rule in
the Federal Register delaying the
effective date of certain provisions of
the interim final rule from October 1,
2005 until November 14, 2005. The
September 30, 2005 final rule also
extended the deadline for submitting
public comments on the interim final
rule from October 11, 2005 until
November 14, 2005. This final rule
further delays the effective date of
certain provisions of the interim final
rule from November 14, 2005 until
January 31, 2006. This delay in effective
date is necessary to provide additional
time for EDA to consider comments
received concerning certain provisions
of the interim final rule, as well for EDA
to address matters pertaining to the
effective implementation of the interim
final rule. Capitalized terms used but
not otherwise defined in this final rule
have the meanings ascribed to them in
the interim final rule.
DATES: The effective date of the
following provisions of the interim final
rule is delayed from November 14, 2005
until January 31, 2006: (i) Section
304.2(c)(2), pertaining to membership of
a District Organization’s governing
body; and (ii) Section 301.4, as the
provisions of this section relate to
SUMMARY:
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69053
Investment Rates for EDA Planning
Investments.
a regulatory flexibility analysis has not
been prepared.
FOR FURTHER INFORMATION CONTACT:
Executive Order No. 12866
It has been determined that this final
rule is not significant for purposes of
Executive Order 12866.
Hina Shaikh, Attorney Advisor, Office
of Chief Counsel, Economic
Development Administration,
Department of Commerce, Room 7005,
1401 Constitution Avenue, NW.,
Washington DC 20230; telephone: (202)
482–4687.
SUPPLEMENTARY INFORMATION: EDA
published an interim final rule in the
Federal Register (70 FR 47002) on
August 11, 2005. The interim final rule
reflects the amendments made to EDA’s
authorizing statute, the Public Works
and Economic Development Act of 1965
(42 U.S.C. 3121 et seq.) (‘‘PWEDA’’), by
the Economic Development
Reauthorization Act of 2004 (Pub. L.
108–373). In addition to tracking the
statutory amendments to PWEDA, the
interim final rule reflects EDA’s current
practices and policies in administering
its economic development programs
that have evolved since the
promulgation of EDA’s former
regulations. The interim final rule also
provides for a public comment period.
On September 30, 2005, EDA
published a final rule in the Federal
Register (70 FR 57124) delaying the
effective date of certain provisions in
the interim final rule from October 1,
2005 until November 14, 2005. The
September 30, 2005 final rule also
extended the deadline for submitting
public comments on the interim final
rule from October 11, 2005 until
November 14, 2005. All other provisions
of the interim final rule became effective
on October 1, 2005.
This final rule delays the effective
date of the provisions specified in the
DATES section pertaining to EDA’s
Planning Investment Rates and District
Organizations from November 14, 2005
until January 31, 2006. This delay in
effective date is necessary to provide
additional time for EDA to consider
comments received concerning certain
provisions of the interim final rule, as
well for EDA to address matters
pertaining to the effective
implementation of the interim final rule.
Classification
Prior notice and opportunity for
public comment are not required for
rules concerning public property, loans,
grants, benefits, and contracts (5 U.S.C.
553(a)(2)). Because prior notice and an
opportunity for public comment are not
required pursuant to 5 U.S.C. 553 or any
other law, the analytical requirements of
the Regulatory Flexibility Act (5 U.S.C.
601 et seq.) are inapplicable. Therefore,
PO 00000
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Fmt 4700
Sfmt 4700
Congressional Review Act
This final rule is not ‘‘major’’ under
the Congressional Review Act (5 U.S.C.
801 et seq.).
Executive Order No. 13132
Executive Order 13132 requires
agencies to develop an accountable
process to ensure ‘‘meaningful and
timely input by State and local officials
in the development of regulatory
policies that have federalism
implications.’’ ‘‘Policies that have
federalism implications’’ is defined in
Executive Order 13132 to include
regulations that have ‘‘substantial direct
effects 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.’’ It has
been determined that this final rule does
not contain policies that have
federalism implications.
Dated: November 7, 2005.
Benjamin Erulkar,
Chief Counsel, Economic Development
Administration.
[FR Doc. 05–22546 Filed 11–10–05; 8:45 am]
BILLING CODE 3510–24–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM335; Special Conditions No.
25–307–SC]
Special Conditions: Cessna Model 650
Airplanes; High-Intensity Radiated
Fields (HIRF)
Federal Aviation
Administration (FAA), DOT.
ACTION: Final special conditions; request
for comments.
AGENCY:
SUMMARY: These special conditions are
issued for Cessna Model 650 airplanes
modified by Elliott Aviation Technical
Product Development, 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 incorporates the
installation of electronic flight display
systems manufactured by Universal
E:\FR\FM\14NOR1.SGM
14NOR1
69054
Federal Register / Vol. 70, No. 218 / Monday, November 14, 2005 / Rules and Regulations
Avionics Systems Corporation. The
electronic flight display systems
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 November 3, 2005.
We must receive your comments by
December 14, 2005.
ADDRESSES: You must mail two copies
of your comments to: Federal Aviation
Administration, Transport Airplane
Directorate, Attention: Rules Docket
(ANM–113), Docket No. NM335, 1601
Lind Avenue, SW., Renton, Washington
98055–4056. You may deliver two
copies to the Transport Airplane
Directorate at the above address. You
must mark your comments: Docket No.
NM335. You can inspect comments in
the Rules Docket weekdays, except
Federal Holidays, between 7:30 a.m. and
4 p.m.
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
people to take part in this rulemaking by
sending 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
VerDate Aug<31>2005
15:39 Nov 10, 2005
Jkt 208001
report summarizing each substantive
public contact with FAA personnel
concerning these special conditions.
You may inspect the docket 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 August 18, 2005, Elliott Aviation
Technical Product Development, Inc.,
Quad City Airport, PO Box 100, Moline,
Illinois 61266, applied for a
Supplemental Type Certificate (STC) to
modify Cessna Model 650 airplanes.
These models are currently approved
under Type Certificate No. A9NM. The
Cessna Model 650 is a small transport
category airplane. The Cessna Model
650 airplanes are powered by two
turbine engines, with maximum takeoff
weights of up to 23,000 pounds. These
airplanes operate with a 2-person crew
and can seat up to 13 passengers. The
modification incorporates the
installation of electronic flight display
systems manufactured by Universal
Avionics Systems Corporation. The
avionics/electronics and electrical
systems 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, Elliott Aviation Technical
Product Development, Inc. must show
that the Cessna Model 650, as changed,
continues to meet the applicable
provisions of the regulations
incorporated by reference in Type
Certificate No. A9NM, 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 certification
basis for the Cessna Model 650 airplanes
includes part 25 of 14 CFR effective
February 1, 1965, as amended by
PO 00000
Frm 00014
Fmt 4700
Sfmt 4700
Amendment 25–1 through Amendment
25–39; §§ 25.901(c) and 25.1199 as
amended by Amendment 25–1 through
Amendment 25–40; §§ 25.1309 and
25.1351(d) as amended by Amendment
25–1 through Amendment 25–41;
§§ 25.177, 25.255, and 25.703 as
amended by Amendment 25–1 through
Amendment 25–42; § 25.1326 as
amended by Amendment 25–1 through
Amendment 25–43; § 25.1413 as
amended by Amendment 25–1 through
Amendment 25–44; §§ 25.1305 and
25.1529 as amended by Amendment 25–
1 through Amendment 25–54. In
addition, the certification basis includes
certain special conditions, exemptions,
equivalent levels of safety, or later
amended sections of the applicable part
25 that are not relevant to these special
conditions.
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 Cessna Model 650
airplanes because of a novel or unusual
design feature, special conditions are
prescribed under § 21.16.
In addition to the applicable
airworthiness regulations and special
conditions, the Cessna Model 650
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 under § 11.38 and
become part of the type certification
basis under § 21.101.
Special conditions are initially
applicable to the model for which they
are issued. Should Elliott Aviation
Technical Product Development, Inc.
apply at a later date for a supplemental
type certificate to modify any other
model included on Type Certificate No.
A9NM to incorporate the same or
similar novel or unusual design feature,
these special conditions would also
apply to the other model under § 21.101.
Novel or Unusual Design Features
As noted earlier, the Cessna Model
650 airplanes modified by Elliott
Aviation Technical Product
Development, Inc. will incorporate
electronic flight display systems. These
systems may be vulnerable to highintensity 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, these systems are
considered to be a novel or unusual
design feature.
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Federal Register / Vol. 70, No. 218 / Monday, November 14, 2005 / Rules and Regulations
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 Cessna Model 650 airplanes
modified by Elliott Aviation Technical
Product Development, 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.
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15:39 Nov 10, 2005
Jkt 208001
Frequency
Field strength
(volts per meter)
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 .......
18 GHz–40 GHz .......
50
50
50
100
50
50
100
100
700
700
2000
3000
3000
1000
3000
2000
600
Average
50
50
50
100
50
50
100
100
50
100
200
200
200
200
300
200
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 Cessna
Model 650 airplanes modified by Elliott
Aviation Technical Product
Development, Inc. Should Elliott
Aviation Technical Product
Development, Inc. apply at a later date
for a supplemental type certificate to
modify any other model included on
Type Certificate No. A9NM to
incorporate the same or similar novel or
unusual design feature, these special
conditions would apply to that model as
well under provisions of § 21.101.
Conclusion
This action affects only certain novel
or unusual design features on Cessna
Model 650 airplanes modified by Elliott
Aviation Technical Product
Development, 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
PO 00000
Frm 00015
Fmt 4700
Sfmt 4700
69055
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.
The authority citation for these
special conditions is as follows:
I
Authority: 49 U.S.C. 106(g), 40113, 44701,
44702, 44704.
The Special Conditions
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 Cessna Model
650 airplanes modified by Elliott
Aviation Technical Product
Development, 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.
I
Issued in Renton, Washington, on
November 3, 2005.
Ali Bahrami,
Manager, Transport Airplane Directorate,
Aircraft Certification Service.
[FR Doc. 05–22521 Filed 11–10–05; 8:45 am]
BILLING CODE 4910–13–P
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]]>Agencies
[Federal Register Volume 70, Number 218 (Monday, November 14, 2005)]
[Rules and Regulations]
[Pages 69053-69055]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 05-22521]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM335; Special Conditions No. 25-307-SC]
Special Conditions: Cessna Model 650 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 Cessna Model 650
airplanes modified by Elliott Aviation Technical Product Development,
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 incorporates the installation of electronic flight display
systems manufactured by Universal
[[Page 69054]]
Avionics Systems Corporation. The electronic flight display systems
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 November 3,
2005. We must receive your comments by December 14, 2005.
ADDRESSES: You must mail two copies of your comments to: Federal
Aviation Administration, Transport Airplane Directorate, Attention:
Rules Docket (ANM-113), Docket No. NM335, 1601 Lind Avenue, SW.,
Renton, Washington 98055-4056. You may deliver two copies to the
Transport Airplane Directorate at the above address. You must mark your
comments: Docket No. NM335. You can inspect comments in the Rules
Docket weekdays, except Federal Holidays, between 7:30 a.m. and 4 p.m.
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 people to take part in this
rulemaking by sending 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. You may inspect the docket 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 August 18, 2005, Elliott Aviation Technical Product Development,
Inc., Quad City Airport, PO Box 100, Moline, Illinois 61266, applied
for a Supplemental Type Certificate (STC) to modify Cessna Model 650
airplanes. These models are currently approved under Type Certificate
No. A9NM. The Cessna Model 650 is a small transport category airplane.
The Cessna Model 650 airplanes are powered by two turbine engines, with
maximum takeoff weights of up to 23,000 pounds. These airplanes operate
with a 2-person crew and can seat up to 13 passengers. The modification
incorporates the installation of electronic flight display systems
manufactured by Universal Avionics Systems Corporation. The avionics/
electronics and electrical systems 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, Elliott Aviation Technical
Product Development, Inc. must show that the Cessna Model 650, as
changed, continues to meet the applicable provisions of the regulations
incorporated by reference in Type Certificate No. A9NM, 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 certification basis for the Cessna Model 650
airplanes includes part 25 of 14 CFR effective February 1, 1965, as
amended by Amendment 25-1 through Amendment 25-39; Sec. Sec. 25.901(c)
and 25.1199 as amended by Amendment 25-1 through Amendment 25-40;
Sec. Sec. 25.1309 and 25.1351(d) as amended by Amendment 25-1 through
Amendment 25-41; Sec. Sec. 25.177, 25.255, and 25.703 as amended by
Amendment 25-1 through Amendment 25-42; Sec. 25.1326 as amended by
Amendment 25-1 through Amendment 25-43; Sec. 25.1413 as amended by
Amendment 25-1 through Amendment 25-44; Sec. Sec. 25.1305 and 25.1529
as amended by Amendment 25-1 through Amendment 25-54. In addition, the
certification basis includes certain special conditions, exemptions,
equivalent levels of safety, or later amended sections of the
applicable part 25 that are not relevant to these special conditions.
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 Cessna Model 650 airplanes because
of a novel or unusual design feature, special conditions are prescribed
under Sec. 21.16.
In addition to the applicable airworthiness regulations and special
conditions, the Cessna Model 650 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 under
Sec. 11.38 and become part of the type certification basis under Sec.
21.101.
Special conditions are initially applicable to the model for which
they are issued. Should Elliott Aviation Technical Product Development,
Inc. apply at a later date for a supplemental type certificate to
modify any other model included on Type Certificate No. A9NM to
incorporate the same or similar novel or unusual design feature, these
special conditions would also apply to the other model under Sec.
21.101.
Novel or Unusual Design Features
As noted earlier, the Cessna Model 650 airplanes modified by
Elliott Aviation Technical Product Development, Inc. will incorporate
electronic flight display systems. 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, these systems are considered
to be a novel or unusual design feature.
[[Page 69055]]
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 Cessna Model 650 airplanes modified by
Elliott Aviation Technical Product Development, 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
Cessna Model 650 airplanes modified by Elliott Aviation Technical
Product Development, Inc. Should Elliott Aviation Technical Product
Development, Inc. apply at a later date for a supplemental type
certificate to modify any other model included on Type Certificate No.
A9NM to incorporate the same or similar novel or unusual design
feature, these special conditions would apply to that model as well
under provisions of Sec. 21.101.
Conclusion
This action affects only certain novel or unusual design features
on Cessna Model 650 airplanes modified by Elliott Aviation Technical
Product Development, 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 Cessna Model 650
airplanes modified by Elliott Aviation Technical Product Development,
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 November 3, 2005.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 05-22521 Filed 11-10-05; 8:45 am]
BILLING CODE 4910-13-P
