[Federal Register: October 22, 2004 (Volume 69, Number 204)]
[Rules and Regulations]
[Page 61991-61993]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr22oc04-2]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM292, Special Conditions No. 25-275-SC]
Special Conditions: Dassault-Breguet Model Falcon 10 Airplanes;
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-Breguet Model
Falcon 10 airplanes modified by Flight Test Associates Incorporated, of
Mojave, California. The modified 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 Model AM-250
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 October 22,
2004. Comments must be received on or before November 22, 2004.
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. NM292, 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. NM292.
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 is impracticable, because these procedures would significantly
delay certification of the airplane and thus delivery of the affected
aircraft. In addition, the substance of these special conditions has
been subject to the public comment process in several prior instances
with no substantive comments received. The FAA, therefore, finds that
good cause exists for making these special conditions effective upon
issuance; however, the FAA invites 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,
[[Page 61992]]
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, based on 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 June 10, 2004, Flight Test Associates Incorporated, of Mojave,
California, applied to the FAA, Los Angeles Aircraft Certification
Office, for a supplemental type certificate (STC) to modify Dassault-
Breguet Model Falcon 10 airplanes. The proposed modification
incorporates the installation of digital Honeywell Model AM-250
Barometric Altimeters as primary altimeters. These digital altimeters
would perform critical functions, that is functions whose failure would
prevent the continued safe flight and landing of the airplane. The
digital altimeters to be installed in these airplanes 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, Flight Test Associates must
show that the Model Falcon 10 airplanes, as changed, continue to meet
the applicable provisions of the regulations incorporated by reference
in Type Certificate No. A33EU 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.
A33EU include 14 CFR part 25, as amended by Amendments 25-1 through 25-
20.
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 modified Dassault-Breguet Model
Falcon 10 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 Model Falcon 10 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 Flight Test Associates apply at a later date
for a supplemental type certificate to modify any other model included
on Type Certificate No. A33EU to incorporate the same or similar 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
The Dassault-Breguet Model Falcon 10 airplanes modified by Flight
Test Associates Incorporated will incorporate new dual primary
altimeters that will perform critical functions. These systems may be
vulnerable to HIRF 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 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 Dassault-Breguet Model Falcon 10
airplanes modified by Flight Test Associates Incorporated. 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
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
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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-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.
[[Page 61993]]
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-Breguet Model Falcon 10 airplanes modified by Flight Test
Associates Incorporated. Should Flight Test Associates Incorporated
apply at a later date for a supplemental type certificate to modify any
other model included on Type Certificate No. A33EU to incorporate the
same or similar novel or unusual design feature, these special
conditions would apply to that model as well as under the provisions of
14 CFR 21.101.
Conclusion
This action affects only certain novel or unusual design features
on Dassault-Breguet Model Falcon 10 airplanes modified by Flight Test
Associates Incorporated. 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.
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 submitted in
response to the prior opportunities for comment described above.
List of Subjects in 14 CFR Part 25
Aircraft, Aviation safety, Reporting and record keeping
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 Dassault-Breguet
Model Falcon 10 airplanes modified by Flight Test Associates
Incorporated:
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 October 14, 2004.
Kalene C. Yanamura,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 04-23668 Filed 10-21-04; 8:45 am]
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