Special Conditions; West Star Aviation, EFIS on the Cessna 441; Protection of Systems for High Intensity Radiated Fields (HIRF), 32711-32713 [05-10907]
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Federal Register / Vol. 70, No. 107 / Monday, June 6, 2005 / Rules and Regulations
the deposit, including interest; and
advise the applicant of the total amount
of deposit due.
(2) The agency shall establish a
deposit account showing the total
amount due and a payment schedule
(unless deposit is made in one lump
sum) to record the date and amount of
each payment.
(3) If an eligible individual cannot
make payment in one lump sum, the
agency shall accept installment
payments (by allotments or otherwise).
The agency, however, is not required to
accept individual checks in amounts
less than $50.
(4) Payments received by the agency
shall be remitted to OPM immediately
for deposit to the Civil Service
Retirement and Disability Fund.
(5) Once a deposit has been paid in
full or otherwise closed out, the agency
shall submit the documentation
pertaining to the deposit to OPM in
accordance with instructions issued by
OPM.
(h) Effect of deposit. An individual
completing a deposit under this section
whose entitlement to an annuity is
based on a separation from service on or
after February 10, 2004, will receive air
traffic controller retirement credit for
such service, for annuity entitlement
and computation purposes, when OPM
receives certification that the deposit
has been paid in full, and the deposit
payment is remitted to the Civil Service
Retirement and Disability Fund.
[FR Doc. 05–11134 Filed 6–3–05; 8:45 am]
BILLING CODE 6325–39–P
DEPARTMENT OF AGRICULTURE
Rural Utilities Service
7 CFR Part 1738
RIN 0572–AB81
Rural Broadband Access Loans and
Loan Guarantees
Rural Utilities Service, USDA.
Notice of confirmation of direct
final rule.
AGENCY:
ACTION:
The Rural Utilities Service
(RUS), an agency delivering the United
States Department of Agriculture’s Rural
Development Utilities Programs, gives
notice that no adverse comments were
received regarding the direct final rule
amending its regulations to revise the
definition for ‘‘eligible rural
community’’ as it relates to the rural
access broadband loans and loan
guarantees program, and confirms the
effective date of the direct final rule.
SUMMARY:
VerDate jul<14>2003
18:06 Jun 03, 2005
Jkt 205001
The direct final rule published in
the Federal Register on April 4, 2005,
(70 FR 16930) was effective on May 19,
2005.
DATES:
FOR FURTHER INFORMATION CONTACT:
Jonathan Claffey, Acting Assistant
Administrator, Telecommunications
Program, Rural Utilities Service, U.S.
Department of Agriculture, 1400
Independence Avenue, SW., STOP
1590, Room 4056, Washington, DC
20250–1590. Telephone number (202)
720–9554, Facsimile (202) 720–0810.
SUPPLEMENTARY INFORMATION:
Background
The Rural Utilities Service (RUS)
published in the Federal Register on
January 30, 2003, at 68 FR 4684, a final
rule amending its regulations in order to
establish the Rural Broadband Access
Loan and Loan Guarantee Program as
authorized by the Farm Security and
Rural Investment Act of 2002 (Pub. L.
101–171) (2002 Act). Section 6103 of the
Farm Security and Rural Investment Act
of 2002 amended the Rural
Electrification Act of 1936, as amended
(RE Act), to add Title VI, Rural
Broadband Access, to provide loans and
loan guarantees to fund the cost of
construction, improvement, or
acquisition of facilities and equipment
for the provision of broadband service
in eligible rural communities.
The direct final rule amended
§ 1738.2, Definitions, to conform the
rule to substantive changes in authority.
The definition for ‘‘eligible rural
community’’ in section 601(b)(2) of the
Rural Electrification Act of 1936 (7
U.S.C. 950bb(b)(2)) was amended on
January 23, 2004, by section 772 of Pub.
L. 108–199, of the Consolidated
Appropriations Act, 2004 to eliminate
the requirement that a community exist
outside a standard metropolitan
statistical area. The rule incorporated
language of the revised statute and
explained RUS’’ interpretation of the
language.
Confirmation of Effective Date
This is to confirm the effective date of
May 19, 2005, for the direct final rule,
7 CFR 1738, Rural Broadband Access
Loans and Loan Guarantees, published
in the Federal Register on April 4, 2005.
Dated: May 26, 2005.
Curtis M. Anderson,
Acting Administrator, Rural Utilities Service.
[FR Doc. 05–11137 Filed 6–3–05; 8:45 am]
BILLING CODE 3410–15–P
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32711
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 23
[Docket No. CE224, Special Condition 23–
164–SC]
Special Conditions; West Star
Aviation, EFIS on the Cessna 441;
Protection of Systems for High
Intensity Radiated Fields (HIRF)
Federal Aviation
Administration (FAA), DOT.
ACTION: Final special conditions; request
for comments.
AGENCY:
SUMMARY: These special conditions are
issued to West Star Aviation, 796
Heritage Way, Grand Junction, CO
81506, for a Supplemental Type
Certificate for the Cessna 441 Conquest.
This airplane will have novel and
unusual design features when compared
to the state of technology envisaged in
the applicable airworthiness standards.
These novel and unusual design
features include the installation of an
electronic flight instrument system
(EFIS) in the form of two digital
altimeters. The digital altimeters will be
Honeywell/Ametek AM–250 models,
one on the pilot side and one on the
copilot side, for which the applicable
regulations do not contain adequate or
appropriate airworthiness 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 the airworthiness
standards applicable to these airplanes.
DATES: The effective date of these
special conditions is May 18, 2005.
Comments must be received on or
before July 6, 2005.
ADDRESSES: Comments may be mailed
in duplicate to: Federal Aviation
Administration, Regional Counsel,
ACE–7, Attention: Rules Docket Clerk,
Docket No. CE224, Room 506, 901
Locust, Kansas City, Missouri 64106. All
comments must be marked: Docket No.
CE224. 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: Wes
Ryan, Aerospace Engineer, Standards
Office (ACE–110), Small Airplane
Directorate, Aircraft Certification
Service, Federal Aviation
Administration, 901 Locust, Room 301,
Kansas City, Missouri 64106; telephone
(816) 329–4127.
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06JNR1
32712
Federal Register / Vol. 70, No. 107 / Monday, June 6, 2005 / Rules and Regulations
The FAA
has determined that notice and
opportunity for prior public comment
hereon are impracticable because these
procedures would significantly delay
issuance of the design approval 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.
SUPPLEMENTARY INFORMATION:
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 notice 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
Docket No. CE224.’’ The postcard will
be date stamped and returned to the
commenter.
Background
West Star Aviation made application
to the FAA for a new Supplemental
Type Certificate for the Cessna 441. The
Cessna 441 is currently approved under
TC No. A28CE. The proposed
modification incorporates a novel or
unusual design features, such as digital
avionics consisting of digital air data
computers that are vulnerable to HIRF
external to the airplane.
Type Certification Basis
Under the provisions of 14 CFR part
21, § 21.101, West Star Aviation must
show that the Cessna 441 aircraft meets
the original certification basis for the
airplane, as listed on Type Data Sheet
A28CE, the additional certification
requirements added for the Honeywell/
Ametek AM–250 system, exemptions, if
any; and the special conditions adopted
by this rulemaking action. The rules that
VerDate jul<14>2003
18:06 Jun 03, 2005
Jkt 205001
were applied at the amendment
appropriate for the application data for
this STC are 23.1301 at Amendment 23–
20, 23.1309 at Amendment 23–49,
23.1311 at Amendment 49, 23.1321 at
Amendment 49, 23.1322 at Amendment
43, 23.1325 at Amendment 50, and
23.1543 at Amendment 50.
Discussion
If the Administrator finds that the
applicable airworthiness standards do
not contain adequate or appropriate
safety standards because of novel or
unusual design features of an airplane,
special conditions are prescribed under
the provisions of § 21.16.
Special conditions, as appropriate, as
defined in § 11.19, are issued in
accordance with § 11.38 after public
notice 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 the applicant apply
for a supplemental type certificate to
modify any other model already
included on the same type certificate to
incorporate the same novel or unusual
design feature, the special conditions
would also apply to the other model
under the provisions of § 21.101.
Novel or Unusual Design Features
West Star Aviation plans to
incorporate certain novel and unusual
design features into the Cessna 441
airplane for which the airworthiness
standards do not contain adequate or
appropriate safety standards for
protection from the effects of HIRF.
These features include EFIS, which are
susceptible to the HIRF environment,
that were not envisaged by the existing
regulations for this type of airplane.
Protection of Systems From High
Intensity Radiated Fields (HIRF):
Recent advances in technology have
given rise to the application in aircraft
designs of advanced electrical and
electronic systems that perform
functions required for continued safe
flight and landing. Due to the use of
sensitive solid-state advanced
components in analog and digital
electronics circuits, these advanced
systems are readily responsive to the
transient effects of induced electrical
current and voltage caused by the HIRF.
The HIRF can degrade electronic
systems performance by damaging
components or upsetting system
functions.
Furthermore, the HIRF environment
has undergone a transformation that was
not foreseen when the current
requirements were developed. Higher
PO 00000
Frm 00004
Fmt 4700
Sfmt 4700
energy levels are radiated from
transmitters that are used for radar,
radio, and television. Also, the number
of transmitters has increased
significantly. There is also uncertainty
concerning the effectiveness of airframe
shielding for HIRF. Furthermore,
coupling to cockpit-installed equipment
through the cockpit window apertures is
undefined.
The combined effect of the
technological advances in airplane
design and the changing environment
has resulted in an increased level of
vulnerability of electrical and electronic
systems required for the continued safe
flight and landing of the airplane.
Effective measures against the effects of
exposure to HIRF must be provided by
the design and installation of these
systems. The accepted maximum energy
levels in which civilian airplane system
installations must be capable of
operating safely are based on surveys
and analysis of existing radio frequency
emitters. These special conditions
require that the airplane be evaluated
under these energy levels for the
protection of the electronic system and
its associated wiring harness. These
external threat levels, which are lower
than previous required values, are
believed to represent the worst case to
which an airplane would be exposed in
the operating environment.
These special conditions require
qualification of systems that perform
critical functions, as installed in aircraft,
to the defined HIRF environment in
paragraph 1 or, as an option to a fixed
value using laboratory tests, in
paragraph 2, as follows:
(1) The applicant may demonstrate
that the operation and operational
capability of the installed electrical and
electronic systems that perform critical
functions are not adversely affected
when the aircraft is exposed to the HIRF
environment defined below:
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 GHz0 .....
E:\FR\FM\06JNR1.SGM
06JNR1
50
50
50
100
50
50
100
100
700
700
2000
3000
3000
1000
3000
2000
Average
50
50
50
100
50
50
100
100
50
100
200
200
200
200
300
200
Federal Register / Vol. 70, No. 107 / Monday, June 6, 2005 / Rules and Regulations
Field strength*
(volts per meter)
Conclusion
This action affects only certain novel
or unusual design features on one model
of airplane. It is not a rule of general
18 GHz–40GHz ........
600
200 applicability and affects only the
applicant who applied to the FAA for
* The field strengths are expressed in terms
approval of these features on the
of peak root-mean-square (rms) values.
airplane.
The substance of these special
or,
conditions has been subjected to the
(2) The applicant may demonstrate by
notice and comment period in several
a system test and analysis that the
prior instances and has been derived
electrical and electronic systems that
perform critical functions can withstand without substantive change from those
previously issued. It is unlikely that
a minimum threat of 100 volts per
prior public comment would result in a
meter, electrical field strength, from 10
significant change from the substance
kHz to 18 GHz. When using this test to
contained herein. For this reason, and
show compliance with the HIRF
because a delay would significantly
requirements, no credit is given for
affect the certification of the airplane,
signal attenuation due to installation.
which is imminent, the FAA has
A preliminary hazard analysis must
determined that prior public notice and
be performed by the applicant for
comment are unnecessary and
approval by the FAA to identify either
impracticable, and good cause exists for
electrical or electronic systems that
adopting these special conditions upon
perform critical functions. The term
issuance. The FAA is requesting
‘‘critical’’ means those functions, whose comments to allow interested persons to
failure would contribute to, or cause, a
submit views that may not have been
failure condition that would prevent the submitted in response to the prior
continued safe flight and landing of the
opportunities for comment described
airplane. The systems identified by the
above.
hazard analysis that perform critical
List of Subjects in 14 CFR Part 23
functions are candidates for the
application of HIRF requirements. A
Aircraft, Aviation safety, Signs and
system may perform both critical and
symbols.
non-critical functions. Primary
Citation
electronic flight display systems, and
The authority citation for these
their associated components, perform
special conditions is as follows:
critical functions such as attitude,
altitude, and airspeed indication. The
Authority: 49 U.S.C. 106(g), 40113 and
HIRF requirements apply only to critical 44701; 14 CFR 21.16 and 21.101; and 14 CFR
11.38 and 11.19.
functions.
Compliance with HIRF requirements
The Special Conditions
may be demonstrated by tests, analysis,
Accordingly, pursuant to the
models, similarity with existing
authority delegated to me by the
systems, or any combination of these.
Administrator, the following special
Service experience alone is not
conditions are issued as part of the type
acceptable since normal flight
certification basis for the Cessna 441
operations may not include an exposure
airplane modified by West Star Aviation
to the HIRF environment. Reliance on a
to add two Honeywell/Ametek AM–250
system with similar design features for
digital air data computers.
redundancy as a means of protection
1. Protection of Electrical and
against the effects of external HIRF is
Electronic Systems from High Intensity
generally insufficient since all elements Radiated Fields (HIRF). Each system
of a redundant system are likely to be
that performs critical functions must be
exposed to the fields concurrently.
designed and installed to ensure that the
Frequency
Peak
Average
Applicability
As discussed above, these special
conditions are applicable to the Cessna
441. Should West Star Aviation apply at
a later date for a supplemental type
certificate to modify any other model on
the same type certificate to incorporate
the same novel or unusual design
feature, the special conditions would
apply to that model as well under the
provisions of § 21.101.
VerDate jul<14>2003
18:06 Jun 03, 2005
Jkt 205001
operations, and operational capabilities
of these systems to perform critical
functions, are not adversely affected
when the airplane is exposed to high
intensity radiated electromagnetic fields
external to the airplane.
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
PO 00000
Frm 00005
Fmt 4700
Sfmt 4700
32713
continued safe flight and landing of the
airplane.
Issued in Kansas City, Missouri on May 18,
2005.
John R. Colomy,
Acting Manager, Small Airplane Directorate,
Aircraft Certification Service.
[FR Doc. 05–10907 Filed 6–3–05; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF AGRICULTURE
Forest Service
36 CFR Part 228
RIN 0596–AC17
Clarification as to When a Notice of
Intent To Operate and/or Plan of
Operation Is Needed for Locatable
Mineral Operations on National Forest
System Lands
Forest Service, USDA.
Final rule.
AGENCY:
ACTION:
SUMMARY: This final rule amends the
regulations governing the use of
National Forest System lands in
connection with operations authorized
by the United States mining laws. The
final rule clarifies the regulations at 36
CFR 228.4(a) concerning the
requirements for mining operators to
submit a ‘‘notice of intent’’ to operate
and requirements to submit and obtain
an approved ‘‘plan of operations.’’
Clarification of the requirements in
§ 228.4(a) are necessary to minimize
adverse environmental impacts to
National Forest System lands and
resources.
DATES: The final rule is effective July 6,
2005.
ADDRESSES: The documents used in
developing this final rule are available
for inspection and copying at the office
of the Director, Minerals and Geology
Management, Forest Service, USDA,
1601 N. Kent Street, 5th Floor,
Arlington, VA 22209, during regular
business hours (8:30 a.m. to 4:30 p.m.),
Monday through Friday, except
holidays. Those wishing to copy or
inspect these documents are asked to
call ahead (703) 605–4818 to facilitate
access to the building.
FOR FURTHER INFORMATION CONTACT:
Mike Doran, Minerals and Geology
Management Staff, (703) 605–4818.
SUPPLEMENTARY INFORMATION:
Background and Need for Final Rule
For purposes of this final rule, all
references to 36 CFR part 228, Subpart
A, without qualifying terms ‘‘interim
rule’’ or ‘‘final rule,’’ refer to language
E:\FR\FM\06JNR1.SGM
06JNR1
]]>Agencies
[Federal Register Volume 70, Number 107 (Monday, June 6, 2005)]
[Rules and Regulations]
[Pages 32711-32713]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 05-10907]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 23
[Docket No. CE224, Special Condition 23-164-SC]
Special Conditions; West Star Aviation, EFIS on the Cessna 441;
Protection of Systems for 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 West Star Aviation, 796
Heritage Way, Grand Junction, CO 81506, for a Supplemental Type
Certificate for the Cessna 441 Conquest. This airplane will have novel
and unusual design features when compared to the state of technology
envisaged in the applicable airworthiness standards. These novel and
unusual design features include the installation of an electronic
flight instrument system (EFIS) in the form of two digital altimeters.
The digital altimeters will be Honeywell/Ametek AM-250 models, one on
the pilot side and one on the copilot side, for which the applicable
regulations do not contain adequate or appropriate airworthiness
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 the airworthiness
standards applicable to these airplanes.
DATES: The effective date of these special conditions is May 18, 2005.
Comments must be received on or before July 6, 2005.
ADDRESSES: Comments may be mailed in duplicate to: Federal Aviation
Administration, Regional Counsel, ACE-7, Attention: Rules Docket Clerk,
Docket No. CE224, Room 506, 901 Locust, Kansas City, Missouri 64106.
All comments must be marked: Docket No. CE224. 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: Wes Ryan, Aerospace Engineer,
Standards Office (ACE-110), Small Airplane Directorate, Aircraft
Certification Service, Federal Aviation Administration, 901 Locust,
Room 301, Kansas City, Missouri 64106; telephone (816) 329-4127.
[[Page 32712]]
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 design
approval 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.
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 notice 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 Docket No. CE224.'' The postcard will be date stamped and
returned to the commenter.
Background
West Star Aviation made application to the FAA for a new
Supplemental Type Certificate for the Cessna 441. The Cessna 441 is
currently approved under TC No. A28CE. The proposed modification
incorporates a novel or unusual design features, such as digital
avionics consisting of digital air data computers that are vulnerable
to HIRF external to the airplane.
Type Certification Basis
Under the provisions of 14 CFR part 21, Sec. 21.101, West Star
Aviation must show that the Cessna 441 aircraft meets the original
certification basis for the airplane, as listed on Type Data Sheet
A28CE, the additional certification requirements added for the
Honeywell/Ametek AM-250 system, exemptions, if any; and the special
conditions adopted by this rulemaking action. The rules that were
applied at the amendment appropriate for the application data for this
STC are 23.1301 at Amendment 23-20, 23.1309 at Amendment 23-49, 23.1311
at Amendment 49, 23.1321 at Amendment 49, 23.1322 at Amendment 43,
23.1325 at Amendment 50, and 23.1543 at Amendment 50.
Discussion
If the Administrator finds that the applicable airworthiness
standards do not contain adequate or appropriate safety standards
because of novel or unusual design features of an airplane, special
conditions are prescribed under the provisions of Sec. 21.16.
Special conditions, as appropriate, as defined in Sec. 11.19, are
issued in accordance with Sec. 11.38 after public notice 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 the applicant apply for a supplemental type
certificate to modify any other model already included on the same type
certificate to incorporate the same novel or unusual design feature,
the special conditions would also apply to the other model under the
provisions of Sec. 21.101.
Novel or Unusual Design Features
West Star Aviation plans to incorporate certain novel and unusual
design features into the Cessna 441 airplane for which the
airworthiness standards do not contain adequate or appropriate safety
standards for protection from the effects of HIRF. These features
include EFIS, which are susceptible to the HIRF environment, that were
not envisaged by the existing regulations for this type of airplane.
Protection of Systems From High Intensity Radiated Fields (HIRF):
Recent advances in technology have given rise to the application in
aircraft designs of advanced electrical and electronic systems that
perform functions required for continued safe flight and landing. Due
to the use of sensitive solid-state advanced components in analog and
digital electronics circuits, these advanced systems are readily
responsive to the transient effects of induced electrical current and
voltage caused by the HIRF. The HIRF can degrade electronic systems
performance by damaging components or upsetting system functions.
Furthermore, the HIRF environment has undergone a transformation
that was not foreseen when the current requirements were developed.
Higher energy levels are radiated from transmitters that are used for
radar, radio, and television. Also, the number of transmitters has
increased significantly. There is also uncertainty concerning the
effectiveness of airframe shielding for HIRF. Furthermore, coupling to
cockpit-installed equipment through the cockpit window apertures is
undefined.
The combined effect of the technological advances in airplane
design and the changing environment has resulted in an increased level
of vulnerability of electrical and electronic systems required for the
continued safe flight and landing of the airplane. Effective measures
against the effects of exposure to HIRF must be provided by the design
and installation of these systems. The accepted maximum energy levels
in which civilian airplane system installations must be capable of
operating safely are based on surveys and analysis of existing radio
frequency emitters. These special conditions require that the airplane
be evaluated under these energy levels for the protection of the
electronic system and its associated wiring harness. These external
threat levels, which are lower than previous required values, are
believed to represent the worst case to which an airplane would be
exposed in the operating environment.
These special conditions require qualification of systems that
perform critical functions, as installed in aircraft, to the defined
HIRF environment in paragraph 1 or, as an option to a fixed value using
laboratory tests, in paragraph 2, as follows:
(1) The applicant may demonstrate that the operation and
operational capability of the installed electrical and electronic
systems that perform critical functions are not adversely affected when
the aircraft is exposed to the HIRF environment defined below:
------------------------------------------------------------------------
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 GHz0.................................... 2000 200
[[Page 32713]]
18 GHz-40GHz...................................... 600 200
------------------------------------------------------------------------
\*\ The field strengths are expressed in terms of peak root-mean-square
(rms) values.
or,
(2) The applicant may demonstrate by a system test and analysis
that the electrical and electronic systems that perform critical
functions can withstand a minimum threat of 100 volts per meter,
electrical field strength, from 10 kHz to 18 GHz. When using this test
to show compliance with the HIRF requirements, no credit is given for
signal attenuation due to installation.
A preliminary hazard analysis must be performed by the applicant
for approval by the FAA to identify either electrical or electronic
systems that perform critical functions. The term ``critical'' means
those functions, whose failure would contribute to, or cause, a failure
condition that would prevent the continued safe flight and landing of
the airplane. The systems identified by the hazard analysis that
perform critical functions are candidates for the application of HIRF
requirements. A system may perform both critical and non-critical
functions. Primary electronic flight display systems, and their
associated components, perform critical functions such as attitude,
altitude, and airspeed indication. The HIRF requirements apply only to
critical functions.
Compliance with HIRF requirements may be demonstrated by tests,
analysis, models, similarity with existing systems, or any combination
of these. Service experience alone is not acceptable since normal
flight operations may not include an exposure to the HIRF environment.
Reliance on a system with similar design features for redundancy as a
means of protection against the effects of external HIRF is generally
insufficient since all elements of a redundant system are likely to be
exposed to the fields concurrently.
Applicability
As discussed above, these special conditions are applicable to the
Cessna 441. Should West Star Aviation apply at a later date for a
supplemental type certificate to modify any other model on the same
type certificate to incorporate the same novel or unusual design
feature, the 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 one model of airplane. 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 period 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:
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 Cessna 441 airplane modified by
West Star Aviation to add two Honeywell/Ametek AM-250 digital air data
computers.
1. Protection of Electrical and Electronic Systems from High
Intensity Radiated Fields (HIRF). Each system that performs critical
functions must be designed and installed to ensure that the operations,
and operational capabilities of these systems to perform critical
functions, are not adversely affected when the airplane is exposed to
high intensity radiated electromagnetic fields external to the
airplane.
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 May 18, 2005.
John R. Colomy,
Acting Manager, Small Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 05-10907 Filed 6-3-05; 8:45 am]
BILLING CODE 4910-13-P
