Special Conditions: Sabreliner Model NA-265-60; High Intensity Radiated Fields (HIRF), 26189-26191 [06-4187]
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26189
Rules and Regulations
Federal Register
Vol. 71, No. 86
Thursday, May 4, 2006
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.
heading Estimated value, in the Total
value column ‘‘899,10’’ is corrected to
read ‘‘899,100’’.
Dated: April 28, 2006.
Lloyd C. Day,
Administrator, Agricultural Marketing
Service.
[FR Doc. 06–4176 Filed 5–3–06; 8:45 am]
BILLING CODE 3410–02–P
DEPARTMENT OF AGRICULTURE
DEPARTMENT OF TRANSPORTATION
Agricultural Marketing Service
Federal Aviation Administration
7 CFR Part 56
14 CFR Part 25
[Docket No. PY–98–006]
[Docket No. NM345, Special Conditions No.
25–317–SC]
RIN 0581–AC50
Special Conditions: Sabreliner Model
NA–265–60; High Intensity Radiated
Fields (HIRF)
Eligibility Requirements for USDA
Graded Shell Eggs
Agricultural Marketing Service,
USDA.
ACTION: Final rule; correction.
mstockstill on PROD1PC68 with RULES
AGENCY:
AGENCY:
SUMMARY: The Agricultural Marketing
Service published in the Federal
Register on April 19, 2006, a document
regarding Voluntary Shell Egg Grading
regulations. The final rule provides that
shell eggs must not have been
previously shipped for retail sale in
order to be officially identified with a
USDA consumer grademark and
changes the definition of the term eggs
of current production from 30 days to 21
days, thereby making eggs that were laid
more than 21 days before the date
packing ineligible to be officially
identified with a USDA-consumer
grademark. In that document, a number
appearing in one of the columns in
Table 1 was typed incorrectly. This
document corrects that error.
DATES: Effective on May 4, 2006.
FOR FURTHER INFORMATION CONTACT:
Charles L. Johnson, Chief, Grading
Branch, (202) 720–3271.
SUPPLEMENTARY INFORMATION: The
Agricultural Marketing Service
published a document in the Federal
Register on April 19, 2006 (71 FR
20288) amending regulations pertaining
to Voluntary Grading of Shell Eggs. In
that document, FR Doc. 06–3693, the
number appearing in the Estimated
value, Total value column should read
899,100, not 899,10. Therefore, in the
Federal Register dated April 19, 2006,
(71 FR 20288), in Table 1, under the
SUMMARY: These special conditions are
issued for Sabreliner Model NA–265–60
airplanes. These airplanes will have
novel and 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 dual
Honeywell Model AM–250 digital
altimeters. 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 provided by the
existing airworthiness standards.
DATES: The effective date of these
special conditions is April 14, 2006. We
must receive your comments by June 5,
2006.
ADDRESSES: You must mail two copies
of your comments to: Federal Aviation
Administration, Transport Airplane
Directorate, Attn: Rules Docket (ANM–
113), Docket No. NM345, 1601 Lind
Avenue, SW., Renton, Washington,
98055–4056. You may deliver two
copies to the Transport Airplane
Directorate at the above address. You
VerDate Aug<31>2005
15:18 May 03, 2006
Jkt 208001
Federal Aviation
Administration (FAA) DOT.
ACTION: Final special conditions; request
for comments.
PO 00000
Frm 00001
Fmt 4700
Sfmt 4700
must mark your comments: Docket No.
NM345. 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 are 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 4:00
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
E:\FR\FM\04MYR1.SGM
04MYR1
26190
Federal Register / Vol. 71, No. 86 / Thursday, May 4, 2006 / Rules and Regulations
postcard on which the docket number
appears. We will stamp the date on the
postcard and mail it back to you.
mstockstill on PROD1PC68 with RULES
Background
On May 17, 2005, Flight Test
Associates of Mojave, California,
applied to the FAA, Los Angeles
Aircraft Certification Office, for a
supplemental type certificate (STC) to
modify Sabreliner Model NA–265–60
airplanes. This model, currently
approved under Type Certificate No.
A2WE, is powered by two Pratt and
Whitney Turbo Wasp JT12A–8 engines
and carries up to ten passengers. The
modification incorporates installation of
dual Honeywell Model AM–250 digital
altimeters that perform critical
functions. These digital altimeters have
the potential to be vulnerable to highintensity radiated fields external to the
airplanes.
Type Certification Basis
Under 14 CFR 21.101, Flight Test
Associates must show that the
Sabreliner Model NA–265–60 airplanes,
as modified, continue to meet the
applicable provisions of the regulations
incorporated by reference in Type
Certificate No. A2WE, or the applicable
regulations in effect on the date of
application for the change. The
regulations incorporated by reference in
the type certificate are commonly
referred to as the ‘‘original type
certification basis.’’ The regulations
incorporated by reference in Type
Certificate No. A2WE include Civil Air
Regulations 4b, as amended by
Amendments 4b–1 through 4b–9.
If the Administrator finds that the
applicable airworthiness regulations do
not contain adequate or appropriate
safety standards for the modified
Sabreliner Model NA–265–60 airplanes
because of a novel or unusual design
feature, special conditions are
prescribed under the provisions of
§ 21.16.
In addition to the applicable
airworthiness regulations and special
conditions, the Sabreliner Model
NA265–60 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 Flight Test
Associates apply at a later date for an
STC to modify any other model
included on Type Certificate No. A2WE
VerDate Aug<31>2005
15:18 May 03, 2006
Jkt 208001
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 Sabreliner Model
NA–265–60 airplanes modified by
Flight Test Associates will incorporate
dual primary altimeters that perform
critical functions. These systems may be
vulnerable to HIRF external to the
airplane. The current airworthiness
standards do not contain adequate or
appropriate safety standards for the
protection of this equipment from the
adverse effects of HIRF. Accordingly,
this system is considered to be a novel
or unusual design feature.
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 indicated in the
following table for the frequency ranges
indicated. Both peak and average field
strength components from the table are
to be demonstrated.
Frequency
Peak
Discussion
There is no specific regulation that
addresses protection 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 Sabreliner Model NA–265–60
airplanes modified by Flight Test
Associates. These special conditions
require that new primary altimeters 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 digital
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:
PO 00000
Frm 00002
Field strength
(volts per meter)
Fmt 4700
Sfmt 4700
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 Sabreliner
Model NA–265–60 airplanes modified
by Flight Test Associates. Should Flight
Test Associates apply at a later date for
an STC to modify any other model
included on Type Certificate No. A2WE
to incorporate the same or similar novel
or unusual design feature, these special
conditions would apply to that model as
well as under § 21.101.
Conclusion
This action affects only certain novel
or unusual design features on the
Sabreliner Model NA–265–60 airplanes.
It is not a rule of general applicability
and affects only the applicant which
applied to the FAA for approval of these
features on the airplane.
E:\FR\FM\04MYR1.SGM
04MYR1
Federal Register / Vol. 71, No. 86 / Thursday, May 4, 2006 / Rules and Regulations
The substance of the special
conditions for these airplanes has
undergone 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.
The authority citation for these
special conditions is as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701,
44702, 44704.
The Special Conditions
mstockstill on PROD1PC68 with RULES
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 Sabreliner Model NA–265–60
airplanes modified by Flight Test
Associates.
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 April 14,
2006.
Ali Bahrami,
Manager, Transport Airplane Directorate,
Aircraft Certification Service.
[FR Doc. 06–4187 Filed 5–3–06; 8:45 am]
BILLING CODE 4910–13–P
VerDate Aug<31>2005
16:11 May 03, 2006
Jkt 208001
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2005–22739; Directorate
Identifier 2005–NM–098–AD; Amendment
39–14583; AD 2006–09–12]
RIN 2120–AA64
Airworthiness Directives; Airbus Model
A300 B4–600, B4–600R, and F4–600R
Series Airplanes, and Model C4–605R
Variant F Airplanes (Collectively Called
A300–600 Series Airplanes); and Model
A310–200 and A310–300 Series
Airplanes
Federal Aviation
Administration (FAA), Department of
Transportation (DOT).
ACTION: Final rule.
AGENCY:
SUMMARY: The FAA is adopting a new
airworthiness directive (AD) for certain
Airbus Model A300–600, A310–200,
and A310–300 series airplanes. This AD
requires modifying the forward outflow
valve of the pressure regulation
subsystem. This AD results from a
report of accidents resulting in injuries
occurring on in-service airplanes when
crewmembers forcibly initiated opening
of passenger/crew doors against residual
pressure, causing the doors to rapidly
open. In these accidents, the buildup of
residual pressure in the cabin was
caused by the blockage of the outflow
valve by an insulation blanket. We are
issuing this AD to prevent an insulation
blanket or other debris from being
ingested into and jamming the forward
outflow valve of the pressure regulation
subsystem, which could lead to the
inability to control cabin pressurization
and adversely affect continued safe
flight of the airplane.
DATES: This AD becomes effective June
8, 2006.
The Director of the Federal Register
approved the incorporation by reference
of certain publications listed in the AD
as of June 8, 2006.
ADDRESSES: You may examine the AD
docket on the Internet at https://
dms.dot.gov or in person at the Docket
Management Facility, U.S. Department
of Transportation, 400 Seventh Street,
SW., Nassif Building, Room PL–401,
Washington, DC.
Contact Airbus, 1 Rond Point Maurice
Bellonte, 31707 Blagnac Cedex, France,
for service information identified in this
proposed AD.
FOR FURTHER INFORMATION CONTACT: Tom
Stafford, Aerospace Engineer,
International Branch, ANM–116,
Transport Airplane Directorate, FAA,
PO 00000
Frm 00003
Fmt 4700
Sfmt 4700
26191
1601 Lind Avenue, SW., Renton,
Washington 98055–4056; telephone
(425) 227–1622; fax (425) 227–1149.
SUPPLEMENTARY INFORMATION:
Examining the Docket
You may examine the airworthiness
directive (AD) docket on the Internet at
https://dms.dot.gov or in person at the
Docket Management Facility office
between 9 a.m. and 5 p.m., Monday
through Friday, except Federal holidays.
The Docket Management Facility office
(telephone (800) 647–5227) is located on
the plaza level of the Nassif Building at
the street address stated in the
ADDRESSES section.
Discussion
The FAA issued a notice of proposed
rulemaking (NPRM) to amend 14 CFR
part 39 to include an AD that would
apply to certain Airbus Model A300–
600, A310–200, and A310–300 series
airplanes. That NPRM was published in
the Federal Register on October 20,
2005 (70 FR 61078). That NPRM
proposed to require modifying the
forward outflow valve of the pressure
regulation subsystem.
Comments
We provided the public the
opportunity to participate in the
development of this AD. We have
considered the comments received.
Supportive Comments
Airline Pilots Association
International concurs with the intent
and proposed language of the NPRM.
The National Transportation Safety
Board supports the proposed
rulemaking.
Request To Include Revised Service
Information
Airbus asks that we change the NPRM
to refer to Airbus Service Bulletins
A300–53–6149 (for Model A300–600
series airplanes) and A310–53–2121 (for
Model A310–200 and A310–300 series
airplanes), both Revision 01, both dated
September 12, 2005, as additional
sources of service information for
accomplishing the modification. The
NPRM refers to the original issue of the
service bulletins as the acceptable
sources of service information for
accomplishing the proposed
modification.
We agree with the request. The
procedures in Revision 01 of the
referenced service bulletins are
essentially the same as those in the
original issue of the service bulletins.
Accordingly, we have revised paragraph
(f) of this AD to refer to Revision 01 of
the service bulletins as the appropriate
E:\FR\FM\04MYR1.SGM
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]]>Agencies
[Federal Register Volume 71, Number 86 (Thursday, May 4, 2006)]
[Rules and Regulations]
[Pages 26189-26191]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 06-4187]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM345, Special Conditions No. 25-317-SC]
Special Conditions: Sabreliner Model NA-265-60; 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 Sabreliner Model NA-
265-60 airplanes. These airplanes will have novel and 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 dual Honeywell Model AM-
250 digital altimeters. 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 provided by the existing
airworthiness standards.
DATES: The effective date of these special conditions is April 14,
2006. We must receive your comments by June 5, 2006.
ADDRESSES: You must mail two copies of your comments to: Federal
Aviation Administration, Transport Airplane Directorate, Attn: Rules
Docket (ANM-113), Docket No. NM345, 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. NM345. 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 are 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 4:00 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
[[Page 26190]]
postcard on which the docket number appears. We will stamp the date on
the postcard and mail it back to you.
Background
On May 17, 2005, Flight Test Associates of Mojave, California,
applied to the FAA, Los Angeles Aircraft Certification Office, for a
supplemental type certificate (STC) to modify Sabreliner Model NA-265-
60 airplanes. This model, currently approved under Type Certificate No.
A2WE, is powered by two Pratt and Whitney Turbo Wasp JT12A-8 engines
and carries up to ten passengers. The modification incorporates
installation of dual Honeywell Model AM-250 digital altimeters that
perform critical functions. These digital altimeters have the potential
to be vulnerable to high-intensity radiated fields external to the
airplanes.
Type Certification Basis
Under 14 CFR 21.101, Flight Test Associates must show that the
Sabreliner Model NA-265-60 airplanes, as modified, continue to meet the
applicable provisions of the regulations incorporated by reference in
Type Certificate No. A2WE, or the applicable regulations in effect on
the date of application for the change. The regulations incorporated by
reference in the type certificate are commonly referred to as the
``original type certification basis.'' The regulations incorporated by
reference in Type Certificate No. A2WE include Civil Air Regulations
4b, as amended by Amendments 4b-1 through 4b-9.
If the Administrator finds that the applicable airworthiness
regulations do not contain adequate or appropriate safety standards for
the modified Sabreliner Model NA-265-60 airplanes because of a novel or
unusual design feature, special conditions are prescribed under the
provisions of Sec. 21.16.
In addition to the applicable airworthiness regulations and special
conditions, the Sabreliner Model NA265-60 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 Flight Test Associates apply at a later date
for an STC to modify any other model included on Type Certificate No.
A2WE 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 Sabreliner Model NA-265-60 airplanes modified
by Flight Test Associates will incorporate dual primary altimeters that
perform critical functions. These systems may be vulnerable to HIRF
external to the airplane. The current airworthiness standards do not
contain adequate or appropriate safety standards for the protection of
this equipment from the adverse effects of HIRF. Accordingly, this
system is considered to be a novel or unusual design feature.
Discussion
There is no specific regulation that addresses protection 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 Sabreliner Model NA-265-60 airplanes
modified by Flight Test Associates. These special conditions require
that new primary altimeters 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 digital 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
indicated in the following table 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
Sabreliner Model NA-265-60 airplanes modified by Flight Test
Associates. Should Flight Test Associates apply at a later date for an
STC to modify any other model included on Type Certificate No. A2WE to
incorporate the same or similar novel or unusual design feature, these
special conditions would apply to that model as well as under Sec.
21.101.
Conclusion
This action affects only certain novel or unusual design features
on the Sabreliner Model NA-265-60 airplanes. It is not a rule of
general applicability and affects only the applicant which applied to
the FAA for approval of these features on the airplane.
[[Page 26191]]
The substance of the special conditions for these airplanes has
undergone 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.
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 the Sabreliner Model NA-
265-60 airplanes modified by Flight Test Associates.
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 April 14, 2006.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 06-4187 Filed 5-3-06; 8:45 am]
BILLING CODE 4910-13-P
