[Federal Register Volume 61, Number 104 (Wednesday, May 29, 1996)]
[Rules and Regulations]
[Pages 26775-26776]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-13426]
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Rules and Regulations
Federal Register
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Federal Register / Vol. 61, No. 104 / Wednesday, May 29, 1996 / Rules
and Regulations
[[Page 26775]]
DEPARTMENT OF TRANSPORTATION
Federation Aviation Administration
14 CFR Part 25
[Docket No. NM-126; Special Conditions No. 25-ANM-16]
Special Conditions: Dassault Aviation, Mystere Falcon 50
Airplane; High-Intensity Radiated Fields
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final special conditions; request for comments.
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SUMMARY: These special conditions are issued for the Dassault Aviation,
Mystere Falcon 50 airplane modified by Garrett Aviation Services of
Springfield, Illinois. This airplane will be equipped with a Collins
EFIS-86C(14) Electronic Flight Instrument System that provides critical
data to the flightcrew. The applicable regulations do not contain
adequate or appropriate safety standards for the position of these
systems from the effects of high-intensity radiated fields. 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 May 21, 1996.
Comments must be received on or before July 15, 1996.
ADDRESSES: Comments on these final special conditions, request for
comments, may be mailed in duplicate to: Federal Aviation
Administration, Office of the Assistant Chief Counsel, Attn: Rules
Docket (ANM-7), Docket No. NM-126, 1601 Lind Avenue SW., Renton,
Washington, 98055-4056; or delivered in duplicate to the Office of the
Assistant Chief Counsel at the above address. Comments must be marked:
Docket No. NM-126. 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:
Connie Beane, FAA, Standardization Branch, ANM-113, Transport Airplane
Directorate, Aircraft Certification Service, 1601 Lind Avenue SW.,
Renton, Washington, 98055-4056; telephone (206) 227-2796; facsimile
(206) 227-1149.
SUPPLEMENTARY INFORMATION:
Comments Invited
The FAA has determined that good cause exists for making these
special conditions effective upon issuance; however, interested persons
are invited to submit such written data, views, or arguments as they
may desire. Communications should identify the regulatory docket and
special conditions number and be submitted in duplicate to the address
specified above. All communications received on or before the closing
date for comments will be considered by the Administrator. These
special conditions may be changed in light of comments received. All
comments submitted will be available in the Rules Docket for
examination by interested persons, both before and after the closing
date for comments. A report summarizing each substantive public contact
with FAA personnel concerning this rulemaking will be filed in the
docket. Persons wishing the FAA to acknowledge receipt of their
comments submitted in response to this request must submit with those
comments a self-addressed, stamped postcard on which the following
statement is made: ``Comments to Docket No. NM-126.'' The postcard will
be date stamped and returned to the commenter.
Background
On March 7, 1996, Garrett Aviation Services of Springfield,
Illinois, applied for a supplemental type certificate to modify
Dassault Aviation, Mystere Falcon 50 airplanes. The Dassault Aviation,
Mystere Falcon 50 is a business jet with three aft mounted turbine
engines. The airplane can carry three crew and 19 passengers depending
on the configuration, and is capable of operating to an altitude of
49,000 feet. The proposed modification incorporates the installation of
a Collins EFIS-86C(14) Electronic Flight Instrument System (EFIS)),
which is potentially vulnerable to high-intensity radiated fields
(HIRF) external to the airplane.
Supplemental Type Certification Basis
Under the provisions of Sec. 21.101 of the Federal Aviation
Regulations (FAR), Garrett Aviation Services must show that the altered
Dassault Aviation, Mystere Falcon 50 airplane continues to meet the
applicable provisions of Sec. 21.29; and part 25, effective February 1,
1965, as amended by Amendments 25-1 through 25-34 and Sec. 25.255 of
Amendments 25-42; Sec. 25.979(d) and (e) of Amendments 25-38;
Sec. 25.1013(b)(1) of Amendments 25-36; Sec. 25.1351(d) of Amendments
25-41; Sec. 25.1353(c)(6) of Amendments 25-42; part 36 of the FAR
effective December 1, 1969, as amended through Amendment 36-9; Special
Federal Aviation Regulations (SFAR) 27 effective February 1, 1974, as
amended through Amendment SFAR 27-1; and Special Conditions 25-86-EU-
24. In addition, the certification basis may include other special
conditions 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 Dassault Aviation, Mystere Falcon
50 airplane because of a novel or unusual design feature, special
conditions are prescribed under the provisions of Sec. 21.16 to
establish a level of safety equivalent to that established in the
regulations.
Special conditions, as appropriate, are issued in accordance with
Sec. 11.49 of the FAR after public notice, as required by Secs. 11.28
and 11.29, and become part of the type certification basis in
accordance with Sec. 21.17(a)(2).
Special conditions are initially applicable to the model for which
they are issued. Should the type certificate for that model be amended
later to include any other model that incorporates the same novel or
unusual design feature, the special conditions would also apply to the
other model under the provisions of Sec. 21.101(a)(1).
Novel or Unusual Design Features
The Dassault Aviation, Mystere Falcon 50 airplane incorporates a
Collins EFIS-86c(14) system that provides critical date to the
flightcrew. This system may be vulnerable to HIRF external to the
airplane.
[[Page 26776]]
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 issued for the Dassault Aviation, Mystere Falcon 50,
which would require that new technology electrical and electronic
systems, such as the EFIS, etc., 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 HIFR 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 paragraphs 1 or 2 below:
1. A minimum threat of 100 volts per meter peak 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 following field
strengths for the frequency ranges indicated.
------------------------------------------------------------------------
Peak (V/ Average
Frequency M) (V/M)
------------------------------------------------------------------------
10 KHz-100 KHz...................................... 50 50
100 KHz-500 KHz..................................... 60 60
500 KHz-2000 KHz.................................... 70 70
2 MHz-30 MHz........................................ 200 200
30 MHz-100 MHz...................................... 30 30
100 MHz-200 MHz..................................... 150 33
200 MHz-400 MHz..................................... 70 70
400 MHz-700 MHz..................................... 4,020 935
700 MHz-1000 MHz.................................... 1,700 170
1 GHz-2 GHz......................................... 5,000 990
2 GHz-4 GHz......................................... 6,680 840
4 GHz-6 GHz......................................... 6,850 310
6 GHz-8 GHz......................................... 3,600 670
8 GHz-12 GHz........................................ 3,500 1,270
12 GHz-18 GHz....................................... 3,500 360
18 GHz-40 GHz....................................... 2,100 750
------------------------------------------------------------------------
As discussed above, these special conditions would be applicable
initially to the Garrett Aviation Services modified Dassault Aviation,
Mystere Falcon 50. Should Garrett Aviation Services apply at a later
date for a change to the supplemental type certificate to include
another model incorporating the same novel or unusual design feature,
the special conditions would apply to that model as well under the
provisions of Sec. 21.101(a)(1).
Conclusion
This action affects only certain design features on the Dassault
Aviation, Mystere Falcon 50 airplane. It is not a rule of general
applicability and affects only the manufacturer who applied to the FAA
for approval of these features on the airplane.
The substance of these 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. It is unlikely that prior public comment would
result in a significant change from the substance contained herein. For
this reason, and because a delay would significantly affect the
certification of the airplane, which is imminent, the FAA has
determined that prior public notice and comment are unnecessary and
impracticable, and good cause exists for adopting these special
conditions immediately. Therefore, these special conditions are being
made effective 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, the following special conditions are issued as part of
the supplemental type certification basis for the Garrett Aviation
Services modified Dassault Aviation, Mystere Falcon 50 series
airplanes.
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 May 21, 1996.
Norman B. Martenson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service, ANM-100.
[FR Doc. 96-13426 Filed 5-28-96; 8:45 am]
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