[Federal Register: October 14, 2005 (Volume 70, Number 198)]
[Rules and Regulations]
[Page 59988-59990]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr14oc05-2]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM334; Special Conditions No. 25-305-SC]
Special Conditions: Dassault-Aviation Mystere-Falcon 50
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 Dassault-Aviation
Mystere-Falcon 50 airplanes modified by Chippewa Aerospace, Inc. These
modified airplanes will have a novel or unusual design feature when
compared to the state of technology envisioned in the airworthiness
standards for transport category airplanes. The modification
incorporates the installation of a Honeywell Primus Epic Control
Display System for Retrofit (CDS-R) that performs 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 established by the existing airworthiness standards.
DATES: The effective date of these special conditions is October 4,
2005. Comments must be received on or before November 14, 2005.
[[Page 59989]]
ADDRESSES: Comments on these special conditions may be mailed in
duplicate to: Federal Aviation Administration, Transport Airplane
Directorate, Attention: Rules Docket (ANM-113), Docket No. NM334, 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. NM334.
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, 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 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 postcard on which the docket number appears. We will stamp the
date on the postcard and mail it back to you.
Background
On January 5, 2005, Chippewa Aerospace, Inc., 1601 Executive
Avenue, Myrtle Beach, South Carolina, 29577, applied for a supplemental
type certificate (STC) to modify Dassault-Aviation Mystere-Falcon 50
airplanes. This model is currently approved under Type Certificate No.
A46EU. The Dassault-Aviation Mystere-Falcon 50 airplanes are transport
category airplanes powered by three Allied Signal TFE-731-3-1C turbine
engines with maximum takeoff weights of up to 40,780 pounds. These
airplanes operate with a 2-pilot crew and can seat up to 19 passengers.
The modification incorporates the installation of a Honeywell Primus
Epic Control Display System for Retrofit (CDS-R). This system performs
a critical function whose failure would prevent the continued safe
flight and landing of the airplane. The integrated flightdeck display
system that will be installed in this airplane has 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, Chippewa Aerospace, Inc.
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 Dassault-Aviation
Mystere-Falcon 50 airplanes includes applicable sections of 14 CFR part
25 as amended by Amendment 25-1 through Amendment 25-34, Special
Conditions No. 25-86-EU-24, 14 CFR part 36 as amended by Amendment 36-1
through Amendment 36-9, and SFAR 27 as amended by Amendment 27-1. 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 Dassault-Aviation Mystere-Falcon 50
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 Dassault-Aviation Mystere-Falcon 50 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 Chippewa Aerospace, Inc. apply at a later date
for a STC to modify any other model included on Type Certificate No.
A46EU 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
As noted earlier, the Dassault-Aviation Mystere-Falcon 50 airplanes
modified by Chippewa Aerospace, Inc. will incorporate a Honeywell
Primus Epic CDS-R that will perform critical functions. This system may
be vulnerable to high-intensity radiated fields (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-Aviation Mystere-Falcon 50
airplanes modified by Chippewa Aerospace, Inc. 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.
[[Page 59990]]
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 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
------------------------------------------------------------------------
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
Dassault-Aviation Mystere-Falcon 50 airplanes modified by Chippewa
Aerospace, Inc. Should Chippewa Aerospace, Inc. apply at a later date
for a STC to modify any other model included on Type Certificate No.
A46EU 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 Dassault-Aviation Mystere-Falcon 50 airplanes modified by Chippewa
Aerospace, Inc. 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 these special conditions 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 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 Dassault-Aviation
Mystere-Falcon 50 airplanes modified by Chippewa Aerospace, Inc.
1. Protection from Unwanted Effects of 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 4, 2005.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 05-20629 Filed 10-13-05; 8:45 am]
BILLING CODE 4910-13-P