Special Conditions: Cessna Aircraft Company Model 650 Citation III Airplanes; High Intensity Radiated Fields (HIRF), 24478-24480 [05-9306]
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Federal Register / Vol. 70, No. 89 / Tuesday, May 10, 2005 / Rules and Regulations
employee in 5 U.S.C. 5541(2), except
employees excluded by 5 U.S.C.
5541(2)(ii), (iii), and (xiv) through (xvii)
are covered by this subpart.
§ 550.603
Definitions.
In this subpart—
Agency means an executive agency, as
defined in 5 U.S.C. 105.
Employee has the meaning given that
term in 5 U.S.C. 2105.
§ 550.604 Biweekly pay periods and
computation of pay.
Agencies must apply the biweekly
pay period and computation of pay
provisions of 5 U.S.C. 5504 for
employees covered by § 550.602(a).
§ 550.605
Exceptions.
An agency head or designee may
deem that an employee excluded from
coverage under § 550.602(b)(2) is
covered by 5 U.S.C. 5504 in situations
where he or she determines that
continuing to calculate the pay of such
employees on a monthly or other basis
would diminish the level of services
provided to the public by the agency.
An agency head or designee also may
deem that otherwise excluded
employees are covered by 5 U.S.C. 5504
when he or she determines that
computing the pay of such employees
under that provision of law would
provide cost savings in agency
operations.
§ 550.606
Reporting exceptions to OPM.
Each agency must notify OPM in
writing of any exceptions made under
§ 550.605.
[FR Doc. 05–9191 Filed 5–9–05; 8:45 am]
BILLING CODE 6325–39–P
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 Honeywell Primus Epic
Control Display System (CDS)/Retrofit
Electronic Flight Instrument System
(EFIS) system, and a second air data
computer. The applicable airworthiness
regulations do not contain adequate or
appropriate safety standards for the
protection of these systems from the
effects of high-intensity-radiated fields
(HIRF). These special conditions
contain the additional safety standards
that the Administrator considers
necessary to establish a level of safety
equivalent to that established by the
existing airworthiness standards.
DATES: The effective date of these
special conditions is April 27, 2005.
Comments must be received on or
before June 24, 2005.
ADDRESSES: Comments on these special
conditions may be mailed in duplicate
to: Federal Aviation Administration,
Transport Airplane Directorate, Attn:
Rules Docket (ANM–113), Docket No.
NM306, 1601 Lind Avenue, SW.,
Renton, Washington, 98055–4056; or
delivered in duplicate to the Transport
Airplane Directorate at the above
address. Comments must be marked:
Docket No. NM306.
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) 227–1149.
SUPPLEMENTARY INFORMATION:
DEPARTMENT OF TRANSPORTATION
Comments Invited
Federal Aviation Administration
The FAA has determined that notice
and opportunity for prior public
comment is impracticable because these
procedures would significantly delay
certification of the airplanes and thus
delivery of the affected aircraft. In
addition, the substance of these special
conditions has been subject to the
public comment process in several prior
instances with no substantive comments
received. The FAA therefore finds that
good cause exists for making these
special conditions effective upon
issuance; however, we invite interested
persons to participate in this rulemaking
by submitting written comments, data,
or views. The most helpful comments
reference a specific portion of the
special conditions, explain the reason
for any recommended change, and
include supporting data. We ask that
14 CFR Part 25
[Docket No. NM306; Special Conditions No.
25–287–SC]
Special Conditions: Cessna Aircraft
Company Model 650 Citation III
Airplanes; High Intensity Radiated
Fields (HIRF)
Federal Aviation
Administration (FAA), DOT.
ACTION: Final special conditions; request
for comments.
AGENCY:
SUMMARY: These special conditions are
issued for Cessna Aircraft Company
Model 650 Citation III airplanes
modified by Pro Star Aviation, LLC.
These airplanes will have novel and
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14:31 May 09, 2005
Jkt 205001
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Sfmt 4700
you send us two copies of written
comments.
We will file in the docket all
comments we receive, as well as a
report summarizing each substantive
public contact with FAA personnel
concerning these special conditions.
The docket is available for public
inspection before and after the comment
closing date. If you wish to review the
docket in person, go to the address in
the ADDRESSES section of this preamble
between 7:30 a.m. and 4 p.m. Monday
through Friday, except Federal holidays.
We will consider all comments we
receive on or before the closing date for
comments. We will consider comments
filed late if it is possible to do so
without incurring expense or delay. We
may change these special conditions in
light of the comments received.
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 March 18, 2005, Pro Star Aviation,
LLC, Manchester Airport, 5 Industrial
Drive, Londonderry, NH 03053, applied
for a supplemental type certificate (STC)
to modify Cessna Aircraft Company
Model 650 Citation III airplanes. These
models are currently approved under
Type Certificate No. A9NM. These
Cessna airplane models are small
transport category airplanes powered by
two Garrett engines. The Cessna Model
650 airplanes carry a total of 15 people
(a pilot, co-pilot, and 13 passengers),
and have two wing tanks and a fuselage
tank. The modification incorporates the
installation of the Honeywell Primus
Epic CDS/Retrofit EFIS system, EGPWS,
and a second air data computer. The
avionics/electronics and electrical
systems installed in these airplanes
have the potential to be vulnerable to
high-intensity radiated fields (HIRF)
external to the airplanes.
Type Certification Basis
Under the provisions of 14 CFR
21.101, Pro Star Aviation, LLC must
show that the Cessna Aircraft Company
Model 650 Citation III airplanes, as
changed, continue to meet the
applicable provisions of the regulations
incorporated by reference in Type
Certificate No. A9NM, or the applicable
regulations in effect on the date of
application for the change. The
regulations incorporated by reference in
the type certificate are commonly
referred to as the ‘‘original type
certification basis.’’ The certification
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Federal Register / Vol. 70, No. 89 / Tuesday, May 10, 2005 / Rules and Regulations
basis for the Cessna Model 650 airplanes
include part 25 of 14 CFR effective
February 1, 1965, as amended by
amendments 25–1 through 25–39;
§§ 25.901(c) and 25.1199 as amended by
Amendments 25–1 through 25–40;
§§ 25.1309 and 25.1351(d) as amended
by Amendments 25–1 through 25–41;
§§ 25.177, 25.255, and 25.703 as
amended by Amendments 25–1 through
25–42; § 25.1326 as amended by
Amendments 25–1 through 25–43;
§ 25.1413 as amended by Amendments
25–1 through 25–44; §§ 25.1305 and
25.1529 as amended by Amendments
25–1 through 25–54. In addition, the
certification basis includes certain
special conditions, exemptions,
equivalent levels of safety, or later
amended sections of the applicable part
25 that are not relevant to these special
conditions.
If the Administrator finds that the
applicable airworthiness regulations
(i.e., part 25, as amended) do not
contain adequate or appropriate safety
standards for modified Cessna Aircraft
Company Model 650 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 Cessna Model 650
airplanes must comply with the fuel
vent and exhaust emission requirements
of 14 CFR part 34 and the noise
certification requirements of 14 CFR
part 36.
Special conditions, as defined in 14
CFR 11.19, are issued in accordance
with § 11.38, and become part of the
type certification basis in accordance
with § 21.101.
Special conditions are initially
applicable to the model for which they
are issued. Should Pro Star Aviation
LLC apply at a later date for a
supplemental type certificate to modify
any other model included on Type
Certificate No. A9NM to incorporate the
same novel or unusual design feature,
these special conditions would also
apply to the other model under the
provisions of § 21.101.
Novel or Unusual Design Features
As noted earlier, the Cessna Aircraft
Company Model 650 airplanes modified
by Pro Star Aviation will incorporate
electrical and electronic systems that
will perform critical functions. These
systems may be vulnerable to highintensity radiated fields external to the
airplane. The current airworthiness
standards of part 25 do not contain
adequate or appropriate safety standards
for the protection of this equipment
from the adverse effects of HIRF.
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14:31 May 09, 2005
Jkt 205001
Accordingly, this system is considered
to be a novel or unusual design feature.
Frequency
Discussion
Peak
There is no specific regulation that
addresses protection requirements for
electronic and electrical systems from
HIRF. Increased power levels from
ground-based radio transmitters and the
growing use of sensitive avionics/
electronics and electrical systems to
command and control airplanes have
made it necessary to provide adequate
protection.
To ensure that a level of safety is
achieved equivalent to that intended by
the regulations incorporated by
reference, special conditions are needed
for the Cessna Model 650 airplanes
modified by Pro Star Aviation. These
special conditions require that new
avionics/electronics and electrical
systems that perform critical functions
be designed and installed to preclude
component damage and interruption of
function due to both the direct and
indirect effects of HIRF.
High-Intensity Radiated Fields (HIRF)
With the trend toward increased
power levels from ground-based
transmitters, and the advent of space
and satellite communications, coupled
with electronic command and control of
the airplane, the immunity of critical
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 is shown with
either HIRF protection special condition
paragraph 1 or 2 below:
1. A minimum threat of 100 volts rms
(root-mean-square) per meter electric
field strength from 10 KHz to 18 GHz.
a. The threat must be applied to the
system elements and their associated
wiring harnesses without the benefit of
airframe shielding.
b. Demonstration of this level of
protection is established through system
tests and analysis.
2. A threat external to the airframe of
the field strengths identified in the table
below for the frequency ranges
indicated. Both peak and average field
strength components from the table are
to be demonstrated.
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Frm 00003
Field strength
(volts per meter)
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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–8GHz ................
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 the Cessna
Aircraft Company Model 650 airplanes.
Should Pro Star Aviation LLC apply at
a later date for a supplemental type
certificate to modify any other model
included on Type Certificate No. A9NM
to incorporate the same or similar novel
or unusual design feature, these special
conditions would apply to that model as
well under the provisions of § 21.101.
Conclusion
This action affects only certain novel
or unusual design features on the
Cessna Model 650 airplanes modified by
Pro Star Aviation LLC. 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 the special
conditions for these airplanes has been
subjected to the notice and comment
procedure in several prior instances and
has been derived without substantive
change from those previously issued.
Because a delay would significantly
affect the certification of the airplane,
which is imminent, the FAA has
determined that prior public notice and
comment are unnecessary and
impracticable, and good cause exists for
adopting these special conditions upon
issuance. The FAA is requesting
comments to allow interested persons to
submit views that may not have been
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Federal Register / Vol. 70, No. 89 / Tuesday, May 10, 2005 / Rules and Regulations
submitted in response to the prior
opportunities for comment described
above.
List of Subjects in 14 CFR Part 25
Aircraft, Aviation safety, Reporting
and recordkeeping requirements.
The authority citation for these special
conditions is as follows:
I
Authority: 49 U.S.C. 106(g), 40113, 44701,
44702, 44704.
The Special Conditions
Accordingly, pursuant to the authority
delegated to me by the Administrator,
the following special conditions are
issued as part of the supplemental type
certification basis for the Cessna Aircraft
Company Model 650 Citation III
airplanes modified by Pro Star Aviation
LLC.
1. Protection from Unwanted Effects
of High-Intensity Radiated Fields
(HIRF). Each electronic and electrical
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 April 27,
2005.
Ali Bahrami,
Manager, Transport Airplane Directorate,
Aircraft Certification Service.
[FR Doc. 05–9306 Filed 5–9–05; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2004–19616; Directorate
Identifier 2004–CE–38–AD; Amendment 39–
14058; AD 2005–08–06]
RIN 2120–AA64
Airworthiness Directives; CENTRAIR
101 Series Gliders
Federal Aviation
Administration, DOT.
ACTION: Final rule; correction.
AGENCY:
VerDate jul<14>2003
14:31 May 09, 2005
Jkt 205001
SUMMARY: This document incorporates
corrections to clarify the intent of
Airworthiness Directive (AD) 2005–08–
06, which was published in the Federal
Register on April 19, 2005 (70 FR
20271). AD 2005–08–06 applies to all
CENTRAIR 101 series gliders. This
action clarifies the applicability to point
out that the affected hinge pins were
installed at manufacturer on serial
numbers 101A600 through 101A637 and
could be replaced on other serial
number gliders with hinge pins that
Centrair delivered between February 20,
1995, and February 28, 2001. We are reissuing the AD in its entirety to help
eliminate any confusion that this AD
may have created.
DATES: Effective Date: The effective date
of this AD remains June 2, 2005.
ADDRESSES: To get the service
information identified in this AD,
contact CENTRAIR, Aerodome B.P.N.
44, 36300 Le Blanc, France; telephone:
02.54.37.07.96; facsimile:
02.54.37.48.64. To review this service
information, go to the National Archives
and Records Administration (NARA).
For information on the availability of
this material at NARA, go to: https://
www.archives.gov/federal_register/
code_of_federal_regulations/
ibr_locations.html or call (202) 741–
6030.
To view the AD docket, go to the
Docket Management Facility; U.S.
Department of Transportation, 400
Seventh Street, SW., Nassif Building,
Room PL–401, Washington, DC 20590–
001 or on the Internet at https://
dms.dot.gov. The docket number is
FAA–2004–19089.
FOR FURTHER INFORMATION CONTACT: Greg
Davison, Aerospace Engineer, FAA,
Small Airplane Directorate, 901 Locust,
Room 301, Kansas City, Missouri 64106;
telephone: (816) 329–4130; facsimile:
(816) 329–4090.
SUPPLEMENTARY INFORMATION:
Discussion
On April 11, 2005, FAA issued AD
2005–08–06, Amendment 39–14058 (70
FR 20271, April 19, 2005), which
applies to all CENTRAIR 101 series
gliders. That AD requires you to replace
any installed elevator or aileron hinge
pins that are not P/N SY991A hinge
pins with P/N SY991A pins.
Need for the This Action
The intent of including all serial
numbers was to affect those hinge pins
that:
1. Were installed at manufacturer on
serial numbers 101A600 through
101A637; and
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Fmt 4700
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2. Could be replaced on other serial
number gliders with hinge pins that
Centrair delivered between February 20,
1995, and February 28, 2001.
Consequently, we are clarifying and
re-issuing the AD in its entirety to help
eliminate any confusion that this AD
may have created.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation
safety, Incorporation by reference,
Safety.
Adoption of the Amendment
Accordingly, under the authority
delegated to me by the Administrator,
the Federal Aviation Administration
amends part 39 of the Federal Aviation
Regulations (14 CFR part 39) as follows:
I
PART 39—AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:
I
Authority: 49 U.S.C. 106(g), 40113, 44701.
§ 39.13
[Amended]
I 2. FAA amends § 39.13 by adding a
new AD to read as follows:
2005–08–06 Centrair: Amendment 39–
14058; Docket No. FAA–2004–19616;
Directorate Identifier 2004–CE–38–AD.
When Does This AD Become Effective?
(a) The effective date of this AD (2005–08–
06) remains June 2, 2005.
What Other ADs Are Affected by This
Action?
(b) None.
What Gliders Are Affected by This AD?
(c) This AD affects Models 101, 101A,
101AP, and 101P gliders, serial numbers as
specified below, that are certificated in any
catergory:
(1) Serial numbers 101A600 through
101A637 where the original manufacturer’s
hinge pins are installed; and
(2) All gliders that had hinge pins replaced
with hinge pins that Centrair delivered
between February 20, 1995, and February 28,
2001.
What Is the Unsafe Condition Presented in
This AD?
(d) This AD is the result of mandatory
continuing airworthiness information (MCAI)
issued by the airworthiness authority for
France. The actions specified in this AD are
intended to replace incorrectly heat-treated
elevator or aileron hinge pins, which could
result in failure of the elevator or ailerons.
Such failure during takeoff, landing, or flight
operations could lead to loss of glider
control.
(e) To address this problem, you must do
the following:
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]]>Agencies
[Federal Register Volume 70, Number 89 (Tuesday, May 10, 2005)]
[Rules and Regulations]
[Pages 24478-24480]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 05-9306]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM306; Special Conditions No. 25-287-SC]
Special Conditions: Cessna Aircraft Company Model 650 Citation
III Airplanes; High Intensity Radiated Fields (HIRF)
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final special conditions; request for comments.
-----------------------------------------------------------------------
SUMMARY: These special conditions are issued for Cessna Aircraft
Company Model 650 Citation III airplanes modified by Pro Star Aviation,
LLC. 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 Honeywell Primus Epic Control Display
System (CDS)/Retrofit Electronic Flight Instrument System (EFIS)
system, and a second air data computer. The applicable airworthiness
regulations do not contain adequate or appropriate safety standards for
the protection of these systems from the effects of high-intensity-
radiated fields (HIRF). These special conditions contain the additional
safety standards that the Administrator considers necessary to
establish a level of safety equivalent to that established by the
existing airworthiness standards.
DATES: The effective date of these special conditions is April 27,
2005. Comments must be received on or before June 24, 2005.
ADDRESSES: Comments on these special conditions may be mailed in
duplicate to: Federal Aviation Administration, Transport Airplane
Directorate, Attn: Rules Docket (ANM-113), Docket No. NM306, 1601 Lind
Avenue, SW., Renton, Washington, 98055-4056; or delivered in duplicate
to the Transport Airplane Directorate at the above address. Comments
must be marked: Docket No. NM306.
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-
1149.
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 airplanes and thus delivery of the affected
aircraft. In addition, the substance of these special conditions has
been subject to the public comment process in several prior instances
with no substantive comments received. The FAA therefore finds that
good cause exists for making these special conditions effective upon
issuance; however, we invite interested persons to participate in this
rulemaking by submitting written comments, data, or views. The most
helpful comments reference a specific portion of the special
conditions, explain the reason for any recommended change, and include
supporting data. We ask that you send us two copies of written
comments.
We will file in the docket all comments we receive, as well as a
report summarizing each substantive public contact with FAA personnel
concerning these special conditions. The docket is available for public
inspection before and after the comment closing date. If you wish to
review the docket in person, go to the address in the ADDRESSES section
of this preamble between 7:30 a.m. and 4 p.m. Monday through Friday,
except Federal holidays.
We will consider all comments we receive on or before the closing
date for comments. We will consider comments filed late if it is
possible to do so without incurring expense or delay. We may change
these special conditions in light of the comments received.
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 March 18, 2005, Pro Star Aviation, LLC, Manchester Airport, 5
Industrial Drive, Londonderry, NH 03053, applied for a supplemental
type certificate (STC) to modify Cessna Aircraft Company Model 650
Citation III airplanes. These models are currently approved under Type
Certificate No. A9NM. These Cessna airplane models are small transport
category airplanes powered by two Garrett engines. The Cessna Model 650
airplanes carry a total of 15 people (a pilot, co-pilot, and 13
passengers), and have two wing tanks and a fuselage tank. The
modification incorporates the installation of the Honeywell Primus Epic
CDS/Retrofit EFIS system, EGPWS, and a second air data computer. The
avionics/electronics and electrical systems installed in these
airplanes have the potential to be vulnerable to high-intensity
radiated fields (HIRF) external to the airplanes.
Type Certification Basis
Under the provisions of 14 CFR 21.101, Pro Star Aviation, LLC must
show that the Cessna Aircraft Company Model 650 Citation III airplanes,
as changed, continue to meet the applicable provisions of the
regulations incorporated by reference in Type Certificate No. A9NM, or
the applicable regulations in effect on the date of application for the
change. The regulations incorporated by reference in the type
certificate are commonly referred to as the ``original type
certification basis.'' The certification
[[Page 24479]]
basis for the Cessna Model 650 airplanes include part 25 of 14 CFR
effective February 1, 1965, as amended by amendments 25-1 through 25-
39; Sec. Sec. 25.901(c) and 25.1199 as amended by Amendments 25-1
through 25-40; Sec. Sec. 25.1309 and 25.1351(d) as amended by
Amendments 25-1 through 25-41; Sec. Sec. 25.177, 25.255, and 25.703 as
amended by Amendments 25-1 through 25-42; Sec. 25.1326 as amended by
Amendments 25-1 through 25-43; Sec. 25.1413 as amended by Amendments
25-1 through 25-44; Sec. Sec. 25.1305 and 25.1529 as amended by
Amendments 25-1 through 25-54. In addition, the certification basis
includes certain special conditions, exemptions, equivalent levels of
safety, or later amended sections of the applicable part 25 that are
not relevant to these special conditions.
If the Administrator finds that the applicable airworthiness
regulations (i.e., part 25, as amended) do not contain adequate or
appropriate safety standards for modified Cessna Aircraft Company Model
650 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 Cessna Model 650 airplanes must comply with the fuel
vent and exhaust emission requirements of 14 CFR part 34 and the noise
certification requirements of 14 CFR part 36.
Special conditions, as defined in 14 CFR 11.19, are issued in
accordance with Sec. 11.38, and become part of the type certification
basis in accordance with Sec. 21.101.
Special conditions are initially applicable to the model for which
they are issued. Should Pro Star Aviation LLC apply at a later date for
a supplemental type certificate to modify any other model included on
Type Certificate No. A9NM to incorporate the same novel or unusual
design feature, these special conditions would also apply to the other
model under the provisions of Sec. 21.101.
Novel or Unusual Design Features
As noted earlier, the Cessna Aircraft Company Model 650 airplanes
modified by Pro Star Aviation will incorporate electrical and
electronic 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 adverse effects of HIRF. Accordingly, this system is
considered to be a novel or unusual design feature.
Discussion
There is no specific regulation that addresses protection
requirements for electronic and electrical systems from HIRF. Increased
power levels from ground-based radio transmitters and the growing use
of sensitive avionics/electronics and electrical systems to command and
control airplanes have made it necessary to provide adequate
protection.
To ensure that a level of safety is achieved equivalent to that
intended by the regulations incorporated by reference, special
conditions are needed for the Cessna Model 650 airplanes modified by
Pro Star Aviation. These special conditions require that new avionics/
electronics and electrical systems that perform critical functions be
designed and installed to preclude component damage and interruption of
function due to both the direct and indirect effects of HIRF.
High-Intensity Radiated Fields (HIRF)
With the trend toward increased power levels from ground-based
transmitters, and the advent of space and satellite communications,
coupled with electronic command and control of the airplane, the
immunity of critical 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 is shown with either HIRF protection
special condition 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-8GHz.......................................... 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 the
Cessna Aircraft Company Model 650 airplanes. Should Pro Star Aviation
LLC apply at a later date for a supplemental type certificate to modify
any other model included on Type Certificate No. A9NM to incorporate
the same or similar novel or unusual design feature, these special
conditions would apply to that model as well under the provisions of
Sec. 21.101.
Conclusion
This action affects only certain novel or unusual design features
on the Cessna Model 650 airplanes modified by Pro Star Aviation LLC. 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 the special conditions for these airplanes has
been subjected to the notice and comment procedure in several prior
instances and has been derived without substantive change from those
previously issued. Because a delay would significantly affect the
certification of the airplane, which is imminent, the FAA has
determined that prior public notice and comment are unnecessary and
impracticable, and good cause exists for adopting these special
conditions upon issuance. The FAA is requesting comments to allow
interested persons to submit views that may not have been
[[Page 24480]]
submitted in response to the prior opportunities for comment described
above.
List of Subjects in 14 CFR Part 25
Aircraft, Aviation safety, Reporting and recordkeeping
requirements.
0
The authority citation for these special conditions is as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701, 44702, 44704.
The Special Conditions
0
Accordingly, pursuant to the authority delegated to me by the
Administrator, the following special conditions are issued as part of
the supplemental type certification basis for the Cessna Aircraft
Company Model 650 Citation III airplanes modified by Pro Star Aviation
LLC.
1. Protection from Unwanted Effects of High-Intensity Radiated
Fields (HIRF). Each electronic and electrical 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 27, 2005.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 05-9306 Filed 5-9-05; 8:45 am]
BILLING CODE 4910-13-P
