[Federal Register Volume 64, Number 195 (Friday, October 8, 1999)]
[Rules and Regulations]
[Pages 54761-54763]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 99-26372]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM164, Special Conditions No. 25-150-SC]
Special Conditions: Boeing 747-100, -100B, -100B SUD, -200B, -
200C, -200F, and -300 Series 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 Boeing Model 747-100,
-100B, -100B SUD, -200B, -200C, -200F, and -300 series airplanes
modified by Canard Aerospace Corporation. 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. 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 September 30,
1999. Comments must be received on or before November 22, 1999.
ADDRESSES: Comments on these special conditions may be mailed in
duplicate to: Federal Aviation Administration, Transport Airplane
Directorate, Attn: Rules Docket (ANM-114), Docket No. NM164, 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. NM164. Comments may be inspected in the
Rules Docket
[[Page 54762]]
weekdays, except Federal holidays, between 7:30 a.m. and 4 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 (425) 227-2796; facsimile (425) 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 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 the 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. NM164.'' The postcard will
be date stamped and returned to the commenter.
Background
On April 2, 1999, Canard Aerospace Corporation, 13050 Pioneer
Trail, Minneapolis, MN 55347, applied for a supplemental type
certificate (STC) to modify Boeing Model 747-100, -100B, -100B SUD, -
200B, -200C, -200F, and -300 series airplanes approved under Type
Certificate No. A20WE. The 747 series airplanes are 231 feet, 4 inches
long and 195 feet, 8 inches wide. The height at vertical stabilizer to
ground is 63 feet, 5 inches. The passenger load is 374 to 420
passengers, and the range is from 5,290 to 6,600 miles. The
modification incorporates the installation of Honeywell Classic
Navigator Systems. Each system consists of a Honeywell HT-9100
Navigation Management System, a Super Attitude Heading Reference
System, and a Digital to Analog Adapter. These advanced systems use
electronics to a far greater extent than the original Inertial
Navigation Systems and may be more susceptible to electrical and
magnetic interference. This disruption of signals could result in loss
of attitude or present misleading information to the pilot.
Type Certification Basis
Under the provisions of 14 CFR 21.101, Canard Aerospace must show
that the Boeing Model 747-100, -100B, -100B SUD, -200B, -200C, -200F,
and -300 series airplanes, as changed, continue to meet the applicable
provisions of the regulations incorporated by reference in Type
Certificate No. A20WE, 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 Boeing Model 747-100, -100B, -100B SUD, -200B, -200C, -200F,
and -300 series airplanes include 14 CFR part 25, dated February 1,
1965, with Amendments 1 through 40, as amended by Type Certificate Data
Sheet (TCDS) A20WE.
If the Administrator finds that the applicable airworthiness
regulations (i.e., 14 CFR part 25, as amended) do not contain adequate
or appropriate safety standards for the Boeing Model 747-100, -100B, -
100B SUD, -200B, -200C, -200F, and -300 series airplanes because of
novel or unusual design features, special conditions are prescribed
under the provisions of Sec. 21.16.
Special conditions, as appropriate, are issued in accordance with
14 CFR 11.49, as required by Secs. 11.28 and 11.29, and become part of
the type certification basis in accordance with Sec. 21.101(b)(2).
Special conditions are initially applicable to the model for which
they are issued. Should Canard Aerospace apply at a later date for
design change approval to modify any other model already included on
the same type certificate 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(a)(1).
Novel or Unusual Design Features
The Boeing Model 747-100, -100B, -100B SUD, -200B, -200C, -200F,
and -300 series airplanes will incorporate a new navigation system,
which was not available at the time of certification of these
airplanes, that performs critical functions. This system may be
vulnerable to HIRF external to the airplane.
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 Boeing Model 747-100, -100B, -100B SUD, -
200B, -200C, -200F, and -300 series airplanes, which require that new
electrical and electronic systems, such as the Honeywell Navigator
System, 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, 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 per meter root-mean-square (rms)
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.
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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
[[Page 54763]]
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
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.
Applicability
As discussed above, these special conditions are applicable to
Boeing 747-100, -100B, -100B SUD, -200B, -200C, -200F, and -300 series
airplanes modified by Canard Aerospace. Should Canard Aerospace 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 Sec. 21.101(a)(1).
Conclusion
This action affects only certain design features on Boeing 747-100,
-100B, -100B SUD, -200B, -200C, -200F, and -300 series airplanes
modified by Canard Aerospace Corporation. 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. 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, pursuant to the authority delegated to me by the
Administrator, the following special conditions are issued as part of
the type certification basis for Boeing 747-100, -100B, -100B SUD, -
200B, -200C, -200F, and -300 series airplanes modified by Canard
Aerospace Corporation.
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.
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, September 30, 1999.
Vi L. Lipski,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service, ANM-100.
[FR Doc. 99-26372 Filed 10-7-99; 8:45 am]
BILLING CODE 4910-13-U