Special Conditions: Raytheon Aircraft Company Model BAe.125 Series 800A; High-Intensity Radiated Fields (HIRF), 8261-8263 [E7-3231]
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8261
Rules and Regulations
Federal Register
Vol. 72, No. 37
Monday, February 26, 2007
This section of the FEDERAL REGISTER
contains regulatory documents having general
applicability and legal effect, most of which
are keyed to and codified in the Code of
Federal Regulations, which is published under
50 titles pursuant to 44 U.S.C. 1510.
The Code of Federal Regulations is sold by
the Superintendent of Documents. Prices of
new books are listed in the first FEDERAL
REGISTER issue of each week.
DEPARTMENT OF AGRICULTURE
Animal and Plant Health Inspection
Service
7 CFR Parts 319 and 354
[Docket No. APHIS–2006–0096]
RIN 0579–AC06
Agricultural Inspection and AQI User
Fees Along the U.S./Canada Border;
Delay of Effective Date
Animal and Plant Health
Inspection Service, USDA.
ACTION: Interim rule; delay of effective
date.
ycherry on PROD1PC64 with RULES
AGENCY:
SUMMARY: We published an interim rule
on August 25, 2006, amending the
foreign quarantine and user fee
regulations by removing the exemptions
from inspection for imported fruits and
vegetables grown in Canada and the
exemptions from user fees for
commercial vessels, commercial trucks,
commercial railroad cars, commercial
aircraft, and international air passengers
entering the United States from Canada.
That interim rule had an effective date
of November 24, 2006. Subsequently,
we published a notice announcing the
delay of the effective date of the removal
of the user fee exemption for
international air passengers until
January 1, 2007, and the effective date
for the remaining provisions of the rule,
including the removal of the exemption
from user fees for commercial vessels,
commercial trucks, commercial railroad
cars, and commercial aircraft entering
the United States from Canada, until
March 1, 2007. We are now further
delaying the effective date of the
removal of the exemption from user fees
for commercial trucks and railroad cars
from Canada until June 1, 2007. We are
making this change to allow additional
time for us to conclude discussions with
the Government of Canada regarding
VerDate Aug<31>2005
15:57 Feb 23, 2007
Jkt 211001
risks, inspections, and costs associated
with land-border traffic entering the
United States from Canada.
DATES: The effective date for the
amendments to 7 CFR 354.3(c)(1), (c)(2),
(c)(3), (d)(2), and (d)(4) published on
August 25, 2006 (71 FR 50320) and
delayed on November 22, 2006 (71 FR
67436) is further delayed to June 1,
2007.
FOR FURTHER INFORMATION CONTACT: Mr.
Alan S. Green, Executive Director, Plant
Health Programs, PPQ, APHIS, 4700
River Road Unit 36, Riverdale, MD
20737; (301) 734–8261.
SUPPLEMENTARY INFORMATION:
Background
The regulations in 7 CFR part 319
prohibit or restrict the importation of
certain plants and plant products into
the United States to prevent the
introduction of plant pests. Similarly,
the regulations in 9 CFR subchapter D
prohibit or restrict the importation of
certain animals and animal products
into the United States to prevent the
introduction of pests or diseases of
livestock. The regulations in 7 CFR part
354 provide rates and requirements for
overtime services relating to imports
and exports and for user fees.
On August 25, 2006, we published an
interim rule in the Federal Register (71
FR 50320–50328) amending the
regulations in 7 CFR parts 319 and 354
by removing the exemptions from
inspection for imported fruits and
vegetables grown in Canada and the
exemptions from user fees for
commercial vessels, commercial trucks,
commercial railroad cars, commercial
aircraft, and international air passengers
entering the United States from Canada.
As a result of this action, all agricultural
products imported from Canada were to
be subject to inspection, and
commercial conveyances, as well as
airline passengers arriving on flights
from Canada, were to be subject to
inspection and user fees. The interim
rule had an effective date of November
24, 2006.
Delay in Effective Date
We received comments from industry
representatives and the Government of
Canada expressing concern about the
possible impact of the rule on affected
entities and questioning whether the
November 2006 effective date allowed
adequate time for those entities to
PO 00000
Frm 00001
Fmt 4700
Sfmt 4700
prepare to comply with the new
inspection and collection procedures
that we would be instituting in order to
enforce the interim rule. After
evaluating the comments, on November
22, 2006, we published a document in
the Federal Register (71 FR 67436)
announcing that we were delaying the
effective date of the removal of the user
fee exemption for international air
passengers until January 1, 2007, and
the effective date for the remaining
provisions of the interim rule, including
the removal of the exemption from user
fees for commercial vessels, commercial
trucks, commercial railroad cars, and
commercial aircraft entering the United
States from Canada, until March 1,
2007.
We are now further delaying the
removal of the exemption from user fees
for commercial trucks and railroad cars
entering the United States from Canada
until June 1, 2007. We are making this
change to allow additional time for us
to conclude discussions with the
Government of Canada regarding risks,
inspections, and costs associated with
land-border traffic entering the United
States from Canada. The March 1, 2007,
effective date for the removal of the
exemption from user fees for
commercial vessels and commercial
aircraft entering the United States from
Canada will remain unchanged.
Authority: 7 U.S.C. 450, 7701–7772, 7781–
7786, and 8301–8317; 21 U.S.C. 136 and
136a; 49 U.S.C. 80503; 7 CFR 2.22, 2.80, and
371.3.
Done in Washington, DC, this 21st day of
February 2007.
Kevin Shea,
Acting Administrator, Animal and Plant
Health Inspection Service.
[FR Doc. E7–3255 Filed 2–23–07; 8:45 am]
BILLING CODE 3410–34–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM369, Special Conditions No.
25–345–SC]
Special Conditions: Raytheon Aircraft
Company Model BAe.125 Series 800A;
High-Intensity Radiated Fields (HIRF)
Federal Aviation
Administration (FAA), DOT.
AGENCY:
E:\FR\FM\26FER1.SGM
26FER1
8262
Federal Register / Vol. 72, No. 37 / Monday, February 26, 2007 / Rules and Regulations
Final special conditions; request
for comments.
ACTION:
SUMMARY: These special conditions are
issued for Raytheon Aircraft Company
Model BAe.125 Series 800A airplanes
modified by Duncan Aviation Inc. These
modified airplanes will have novel or
unusual design features when compared
to the state of technology envisioned in
the airworthiness standards for
transport category airplanes. The
modification incorporates the
installation of electronic flight and
engine instrument systems. The
applicable airworthiness regulations do
not contain adequate or appropriate
safety standards for protecting these
systems from the effects of highintensity radiated fields (HIRF). These
special conditions contain the
additional safety standards 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 February 12, 2007.
We must receive your comments by
March 28, 2007.
ADDRESSES: You must mail two copies
of your comments to: Federal Aviation
Administration, Transport Airplane
Directorate, Attention: Rules Docket
(ANM–113), Docket No. NM369, 1601
Lind Avenue SW., Renton, Washington
98057–3356. You may deliver two
copies to the Transport Airplane
Directorate at the address indicated
above. You must mark your comments:
Docket No. NM369. 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 98057–3356;
telephone (425) 227–2799; facsimile
(425) 227–1320.
SUPPLEMENTARY INFORMATION:
ycherry on PROD1PC64 with RULES
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
VerDate Aug<31>2005
15:57 Feb 23, 2007
Jkt 211001
issuance; however, we invite interested
persons 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 by 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 October 27, 2006, Duncan
Aviation, Inc., 15745 South Airport
Road, Battle Creek, Michigan 49015,
applied for a supplemental type
certificate (STC) to modify Raytheon
Aircraft Company Model BAe.125 Series
800A airplanes currently approved
under Type Certificate No. A3EU. The
Model BAe.125 Series 800A airplanes
are small transport category airplanes.
They are powered by two turbojet
engines, with maximum takeoff weight
of 31,000 pounds as modified by
Modification No. 253379A or 26,866
pounds as modified by Modification No.
25B047A. These airplanes operate with
2-person crew and can seat up to 15
passengers. The proposed modification
is to install the Rockwell Collins Pro
Line 21 Integrated Display Systems. 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 14 CFR 21.101, Duncan
Aviation, Inc. must show the Raytheon
Aircraft Company Model BAe.125 Series
800A aircraft, as changed, continue to
PO 00000
Frm 00002
Fmt 4700
Sfmt 4700
meet the applicable provisions of the
regulations incorporated by reference in
Type Certificate No. A3EU. They must
also continue to meet the applicable
regulations in effect on the date of
application for the change. We
commonly refer to the regulations
incorporated by reference in the type
certificate as the ‘‘original type
certification basis.’’ The regulations
incorporated by reference in Type
Certificate No. A3EU include Part 10 of
the British Civil Airworthiness
Requirements. This certification is
equivalent to Civil Air Regulations
(CAR) 4b dated December 1953, as
amended by Amendment 4b–1 through
Amendment 4b–11, exclusive of CAR 4b
350(e). It includes Special Regulation
SR 422B. In addition, the certification
basis includes certain later amendments
to 14 CFR 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 Raytheon Aircraft
Company Model Bae.125, Series 800A
airplanes, because of a novel or unusual
design feature, special conditions are
prescribed under § 21.16.
Besides the applicable airworthiness
regulations and special conditions, the
Raytheon Aircraft Company Model
BAe.125, Series 800A airplanes, must
comply with the fuel vent exhaust
emission requirements of 14 CFR part
34 and the noise certification
requirements of 14 CFR part 36.
We issue special conditions, as
defined in 14 CFR 11.19, under § 11.38
and they become part of the type
certification basis under § 21.101.
Special conditions are initially
applicable to the model for which they
are issued. Should Duncan Aviation
Inc., apply later for a supplemental type
certificate to modify any other model
included on Type Certificate No. A3EU
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 Raytheon
Aircraft Company Model BAe.125 Series
800A aircraft, as modified by Duncan
Aviation, Inc., will incorporate the
Rockwell Collins Pro Line 21 Integrated
Display Systems 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
E:\FR\FM\26FER1.SGM
26FER1
Federal Register / Vol. 72, No. 37 / Monday, February 26, 2007 / Rules and Regulations
adverse effects of HIRF. Therefore, we
consider this system to be a novel or
unusual design feature.
Frequency
Peak
ycherry on PROD1PC64 with RULES
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 Raytheon Aircraft Company
Model BAe.125 Series 800A airplanes
modified by Duncan Aviation, 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 because of 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.
VerDate Aug<31>2005
15:57 Feb 23, 2007
Jkt 211001
Field Strength
(volts per meter)
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 Raytheon
Aircraft Company Model BAe.125 Series
800A airplanes modified by Duncan
Aviation, Inc. Should Duncan Aviation,
Inc. apply later for a supplemental type
certificate to modify any other model
included on Type Certificate No. A3EU
to incorporate the same or similar novel
or unusual design feature, these special
conditions would apply to that model as
well.
Conclusion
This action affects only certain novel
or unusual design features on Raytheon
Aircraft Company Model BAe.125 Series
800A airplanes as modified by Duncan
Aviation, 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
PO 00000
Frm 00003
Fmt 4700
Sfmt 4700
8263
interested persons to send views that
may not have been sent 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.
I The authority citation for these
special conditions is as follows:
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 Raytheon Aircraft
Company Model BAe.125 Series 800A
airplanes modified by Duncan Aviation,
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 February
12, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate,
Aircraft Certification Service.
[FR Doc. E7–3231 Filed 2–23–07; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2006–24034; Directorate
Identifier 2006–NE–05–AD; Amendment 39–
14959; AD 2007–04–26]
RIN 2120–AA64
Airworthiness Directives; Pratt &
Whitney PW4077D, PW4084D, PW4090,
and PW4090–3 Turbofan Engines
Federal Aviation
Administration (FAA), Department of
Transportation (DOT).
ACTION: Final rule.
AGENCY:
E:\FR\FM\26FER1.SGM
26FER1
]]>Agencies
[Federal Register Volume 72, Number 37 (Monday, February 26, 2007)]
[Rules and Regulations]
[Pages 8261-8263]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E7-3231]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM369, Special Conditions No. 25-345-SC]
Special Conditions: Raytheon Aircraft Company Model BAe.125
Series 800A; High-Intensity Radiated Fields (HIRF)
AGENCY: Federal Aviation Administration (FAA), DOT.
[[Page 8262]]
ACTION: Final special conditions; request for comments.
-----------------------------------------------------------------------
SUMMARY: These special conditions are issued for Raytheon Aircraft
Company Model BAe.125 Series 800A airplanes modified by Duncan Aviation
Inc. These modified airplanes will have novel or unusual design
features when compared to the state of technology envisioned in the
airworthiness standards for transport category airplanes. The
modification incorporates the installation of electronic flight and
engine instrument systems. The applicable airworthiness regulations do
not contain adequate or appropriate safety standards for protecting
these systems from the effects of high-intensity radiated fields
(HIRF). These special conditions contain the additional safety
standards 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 February 12,
2007. We must receive your comments by March 28, 2007.
ADDRESSES: You must mail two copies of your comments to: Federal
Aviation Administration, Transport Airplane Directorate, Attention:
Rules Docket (ANM-113), Docket No. NM369, 1601 Lind Avenue SW., Renton,
Washington 98057-3356. You may deliver two copies to the Transport
Airplane Directorate at the address indicated above. You must mark your
comments: Docket No. NM369. 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 98057-3356; 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 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 by 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 October 27, 2006, Duncan Aviation, Inc., 15745 South Airport
Road, Battle Creek, Michigan 49015, applied for a supplemental type
certificate (STC) to modify Raytheon Aircraft Company Model BAe.125
Series 800A airplanes currently approved under Type Certificate No.
A3EU. The Model BAe.125 Series 800A airplanes are small transport
category airplanes. They are powered by two turbojet engines, with
maximum takeoff weight of 31,000 pounds as modified by Modification No.
253379A or 26,866 pounds as modified by Modification No. 25B047A. These
airplanes operate with 2-person crew and can seat up to 15 passengers.
The proposed modification is to install the Rockwell Collins Pro Line
21 Integrated Display Systems. 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 14 CFR 21.101, Duncan Aviation, Inc. must show the Raytheon
Aircraft Company Model BAe.125 Series 800A aircraft, as changed,
continue to meet the applicable provisions of the regulations
incorporated by reference in Type Certificate No. A3EU. They must also
continue to meet the applicable regulations in effect on the date of
application for the change. We commonly refer to the regulations
incorporated by reference in the type certificate as the ``original
type certification basis.'' The regulations incorporated by reference
in Type Certificate No. A3EU include Part 10 of the British Civil
Airworthiness Requirements. This certification is equivalent to Civil
Air Regulations (CAR) 4b dated December 1953, as amended by Amendment
4b-1 through Amendment 4b-11, exclusive of CAR 4b 350(e). It includes
Special Regulation SR 422B. In addition, the certification basis
includes certain later amendments to 14 CFR 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 Raytheon Aircraft Company Model
Bae.125, Series 800A airplanes, because of a novel or unusual design
feature, special conditions are prescribed under Sec. 21.16.
Besides the applicable airworthiness regulations and special
conditions, the Raytheon Aircraft Company Model BAe.125, Series 800A
airplanes, must comply with the fuel vent exhaust emission requirements
of 14 CFR part 34 and the noise certification requirements of 14 CFR
part 36.
We issue special conditions, as defined in 14 CFR 11.19, under
Sec. 11.38 and they 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 Duncan Aviation Inc., apply later for a
supplemental type certificate to modify any other model included on
Type Certificate No. A3EU 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 Raytheon Aircraft Company Model BAe.125
Series 800A aircraft, as modified by Duncan Aviation, Inc., will
incorporate the Rockwell Collins Pro Line 21 Integrated Display Systems
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
[[Page 8263]]
adverse effects of HIRF. Therefore, we consider this system to be a
novel or unusual design feature.
Discussion
There is no specific regulation that addresses protection
requirements for electrical and electronic systems from HIRF. Increased
power levels from ground-based radio transmitters and the growing use
of sensitive avionics/electronics and electrical systems to command and
control airplanes have made it necessary to provide adequate
protection.
To ensure that a level of safety is achieved equivalent to that
intended by the regulations incorporated by reference, special
conditions are needed for the Raytheon Aircraft Company Model BAe.125
Series 800A airplanes modified by Duncan Aviation, 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 because of 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
Raytheon Aircraft Company Model BAe.125 Series 800A airplanes modified
by Duncan Aviation, Inc. Should Duncan Aviation, Inc. apply later for a
supplemental type certificate to modify any other model included on
Type Certificate No. A3EU to incorporate the same or similar novel or
unusual design feature, these special conditions would apply to that
model as well.
Conclusion
This action affects only certain novel or unusual design features
on Raytheon Aircraft Company Model BAe.125 Series 800A airplanes as
modified by Duncan Aviation, 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 send views that may
not have been sent 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 Raytheon Aircraft Company
Model BAe.125 Series 800A airplanes modified by Duncan Aviation, 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 February 12, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E7-3231 Filed 2-23-07; 8:45 am]
BILLING CODE 4910-13-P
