[Federal Register Volume 67, Number 99 (Wednesday, May 22, 2002)]
[Rules and Regulations]
[Pages 35895-35897]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 02-12852]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM218, Special Conditions No. 25-202-SC]
Special Conditions: Dassault Aviation Mystere-Falcon 50; High
Intensity Radiated Fields (HIRF)
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final special conditions; request for comments.
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SUMMARY: These special conditions are issued for Dassault Aviation
Mystere-Falcon 50 airplanes modified by Garrett Aviation Services.
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 Electronic Primary Flight Display
systems that perform critical functions. The applicable airworthiness
regulations do not contain adequate or appropriate safety standards for
the protection of these systems from the effects of high-intensity
radiated fields (HIRF). These special conditions contain the additional
safety standards that the Administrator considers necessary to
establish a level of safety equivalent to that provided by the existing
airworthiness standards.
DATES: The effective date of these special conditions is May 15, 2002.
Comments must be received on or before June 20, 2002.
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. NM218, 1601 Lind
Avenue SW., Renton, Washington, 98055-4056; or delivered in duplicate
to the Transport Airplane Directorate at the above address. All
comments must be marked: Docket No. NM218. Comments may be inspected in
the Rules Docket weekdays, except Federal holidays, between 7:30 a.m.
and 4:00 p.m.
FOR FURTHER INFORMATION CONTACT: Meghan Gordon, FAA, Standardization
Branch, ANM-113, Transport Airplane Directorate, Aircraft Certification
Service, 1601 Lind Avenue SW., Renton, Washington, 98055-4056;
telephone (425) 227-2138; facsimile (425) 227-1149.
SUPPLEMENTARY INFORMATION:
Comments Invited
The FAA has determined that the substance of these special
conditions has been subject to the public comment process in several
prior instances with no substantive comments received; therefore, good
cause exists for making these special conditions effective upon
issuance. However, the FAA invites interested persons to participate in
this rulemaking by submitting 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 4:00 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 in light of the comments we receive.
If you want the FAA to acknowledge receipt of your comments on this
proposal, 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 April 12, 2002, Garrett Aviation Services, 1200 North Airport
Drive,
[[Page 35896]]
Capital Airport, Springfield, IL 62707, applied for a supplemental type
certificate (STC) to modify Dassault Aviation Mystere-Falcon 50
airplanes approved under Type Certificate No. A46EU. The Dassault
Aviation Mystere-Falcon 50 is a small transport category airplane. The
Dassault Aviation Mystere-Falcon 50 airplanes are powered by three
Turbofan Engines with a maximum takeoff weight of 40,780 pounds. The
aircraft operate with a 2-pilot crew and can hold up to 19 passengers.
The modification incorporates the installation of a Rockwell Collins
ProLine 21 Display System, a Collins AHS-3000 Attitude-Heading
Reference System, and a Goodrich GH-3000 Electronic Standby Display.
The ProLine 21 system consists of dual Electronic Primary Flight
Display systems that replace the existing Primary Flight Display
systems. These systems have the potential to be vulnerable to high-
intensity radiated fields (HIRF) external to the airplane.
Type Certification Basis
Under the provisions of 14 CFR 21.101, Garrett Aviation Services
must show that the Dassault Aviation Mystere-Falcon 50 airplanes, as
changed, continue to meet the applicable provisions of the regulations
incorporated by reference in Type Certificate No. A46EU, or the
applicable regulations in effect on the date of application for the
change. The regulations incorporated by reference in the type
certificate are commonly referred to as the ``original type
certification basis.'' The certification basis for the modified
Dassault Aviation Mystere-Falcon 50 airplanes include 14 CFR part 25,
dated February 1, 1965, as amended by Amendment 25-1 through Amendment
25-34 except for special conditions and exceptions noted in Type
Certificate Data Sheet (TCDS) A46EU.
If the Administrator finds that the applicable airworthiness
regulations (that is, 14 CFR part 25, as amended) do not contain
adequate or appropriate safety standards for the Dassault Aviation
Mystere-Falcon 50 airplanes because of novel or unusual design
features, special conditions are prescribed under the provisions of
21.16.
In addition to the applicable airworthiness regulations and special
conditions, the Dassault Aviation Mystere-Falcon 50 airplanes must
comply with the fuel vent and exhaust emission requirement of 14 CFR
part 34 and the noise certification requirement of 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(b)(2).
Special conditions are initially applicable to the model for which
they are issued. Should Garrett Aviation Services apply at a later date
for a supplemental type certificate to modify any other model already
included on the same type certificate to incorporate the same novel or
unusual design features, these special conditions would also apply to
the other model under the provisions of 14 CFR 21.101(a)(1).
Novel or Unusual Design Features
The Dassault Aviation Mystere-Falcon 50 airplanes modified by
Garrett Aviation Services will incorporate dual Electronic Primary
Flight Display systems that will perform critical functions. The
modification incorporates the installation of a Rockwell Collins
ProLine 21 Display System, a Collins AHS-3000 Attitude-Heading
Reference System, and a Goodrich GH-3000 Electronic Standby Display.
The ProLine 21 system consists of dual Electronic Primary Flight
Display systems that replace the existing Primary Flight Display
systems. These systems have the potential to be vulnerable to high-
intensity radiated fields (HIRF) external to the airplane. The current
airworthiness standards (14 CFR part 25) do not contain adequate or
appropriate safety standards for the protection of this equipment from
the adverse effect 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 electrical and electronic systems from HIRF. Increased
power levels from ground-based radio transmitters and the growing use
of sensitive electrical and electronic 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 Dassault Aviation Mystere-Falcon 50
airplanes modified by Garrett Aviation Services. These special
conditions require that new avionics/electronics and electrical
systems, which 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, plus the advent of space and satellite communications,
coupled with electronic command and control of the airplane, the
immunity of critical digital avionics 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 table below for the frequency ranges indicated. Both
peak and average field strength components from the table below are to
be demonstrated.
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Field Strength (volts
per meter)
Frequency -------------------------
Peak Average
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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-1GHz.................................. 700 100
1 GHz-2 GHz................................... 2000 200
2GHz-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
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The field strengths are expressed in terms of peak root-mean-square
(rms) values over the complete modulation period.
[[Page 35897]]
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
Dassault Aviation Mystere-Falcon 50 airplanes modified by Garrett
Aviation Services. Should Garrett Aviation Services apply at a later
date for design change approval to modify any other model included on
the same type certificate to incorporate the same novel or unusual
design feature, these special conditions would apply to that model as
well under the provisions of 21.101(a)(1).
Conclusion
This action affects only certain design features on Dassault
Aviation Mystere-Falcon 50 airplanes modified by Garrett Aviation
Services. 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 this airplane has been
subjected to the notice and comment procedure in several prior
instances and has been derived without substantive change from those
previously issued. For this reason, and because a delay would
significantly affect the certification of the airplane, which is
imminent, the FAA has determined that prior public notice and comment
are unnecessary and impracticable, and good cause exists for adopting
these special conditions upon issuance. The FAA is requesting comments
to allow interested persons to submit views that may not have been
submitted in response to the prior opportunities for comment described
above.
List of Subjects in 14 CFR Part 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 type certification basis for Dassault Aviation Mystere-Falcon 50
airplanes modified by Garrett Aviation Services.
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, May 15, 2002.
Linda Navarro,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 02-12852 Filed 5-21-02; 8:45 am]
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