[Federal Register Volume 63, Number 163 (Monday, August 24, 1998)]
[Rules and Regulations]
[Pages 44993-44995]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-22642]
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Rules and Regulations
Federal Register
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Federal Register / Vol. 63, No. 163 / Monday, August 24, 1998 / Rules
and Regulations
[[Page 44993]]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 25
[Docket No. NM150; Special Conditions No. 25-140-SC]
Special Conditions: Bombardier Inc., Model BD-700-1A10 Global
Express; 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 Bombardier Model BD-
700-1A10 airplanes manufactured by Bombardier. 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 August 14,
1998. Comments must be received on or before September 23, 1998.
ADDRESSES: Comments on these special conditions may be mailed in
duplicate to: Federal Aviation Administration, Transport Airplane
Directorate, Regulations Branch, ANM-114, 1601 Lind Avenue SW., Renton,
Washington, 98055-4056; Attn: Docket No. NM150, or delivered in
duplicate to the same address. Comments may be inspected in the Docket
weekdays, except Federal holidays, between 7:30 a.m. and 4:00 p.m.
FOR FURTHER INFORMATION CONTACT: Greg Dunn, FAA, Standardization
Branch, ANM-113, Transport Airplane Directorate, Aircraft Certification
Service, 1601 Lind Avenue SW., Renton, Washington, 98055-4056;
telephone (425) 227-2799; 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 regulatory docket and
special condition 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. NM150.'' The postcard will
be date stamped and returned to the commenter.
Background
On January 27, 1994, Bombardier Inc., submitted an application to
Transport Canada for FAA type certification (TC) of the Bombardier Inc.
Model BD-700-1A10 Global Express airplane. The BD-700-1A10 is a long
range, transport category airplane powered by two BMW/Rolls Royce BR710
turbo-fan engines. The airplane's basic use is as a business jet with
two-pilot cockpit, a rest area for a third pilot and flight attendant,
and interior/seating arrangements for up to nineteen passengers, for a
total occupancy of twenty-three persons. The overall length of the BD-
700-1A10 is 99 feet, the height is 24 feet, and the wing span is 92
feet. The airplane has a maximum takeoff weight of 91,250 pounds, a
maximum landing weight of 78,600 pounds, a maximum operating altitude
of 51,000 feet, and a design range of 6500 nautical miles at Mach 0.8
or 6330 nautical miles at Mach 0.85.
Type Certification Basis
Under the provisions of 14 CFR Sec. 21.17, Bombardier must show
that the BD-700-1A10 Global Express meets the applicable provisions of
part 25, effective February 1, 1965, as amended by Amendments 25-1
through 25-79. Subsequent to the January 27, 1994, date of application
for type certification, Bombardier elected to comply with those
sections of part 25 amended by Amendments 25-80 through 86, 25-88, 25-
90, 25-91, and other sections that are not relevant to these special
conditions. In addition, the certification basis for the BD-700-1A10
includes part 34, effective September 10, 1990, plus any amendments in
effect at the time of certification; and part 36, effective December 1,
1969, as amended by Amendment 36-1 through the amendment in effect at
the time of certification. These special conditions will form an
additional part of the type certification basis. The certification
basis may also include other special conditions and exemptions 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 BD-700-1A10 Global Express 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(b), 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 Bombardier BD-700-1A10 airplane will utilize electrical and
electronic systems, such as electronic displays (Honeywell Primus 2000)
and
[[Page 44994]]
Full Authority Digital Engine Controls (Rosec) that perform critical
functions. The disruption of signals to these systems could result in
loss of critical flight systems or misleading information being
presented to the pilot.
Discussion
There is no specific regulation that addresses protection
requirements for electrical and electronic systems from high intensity
radiated fields (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 Bombardier BD-700-1A10, which require
that new electrical and electronic 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.
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 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.
------------------------------------------------------------------------
Field Strength
(volts per
Frequency meter)
-----------------
Peak Average
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10 KHz--100 KHz 50 50
100 KHz--500 KHz 60 60
500 KHz--2 MHz 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 4020 935
700 MHz--1 GHz 1700 170
1 GHz--2 GHz 5000 990
2 GHz--4 GHz 6680 840
4 GHz--6 GHz 6850 310
6 GHz--8 GHz 3600 670
8 GHz--12 GHz 3500 1270
12 GHz--18 GHz 3500 360
18 GHz--40 GHz 2100 750
------------------------------------------------------------------------
The threat levels identified in the above table differ in some
minor respects from those published previously for other airplanes.
They are considered appropriate, however, for the Bombardier BD-700-
1A10 in view of its intended use.
Applicability
As discussed above, these special conditions are applicable to BD-
700-1A10 airplanes manufactured by Bombardier. Should Bombardier apply
at a later date for a change to the 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 Bombardier BD-
700-1A10 airplanes manufactured by Bombardier. 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.
Under standard practice, the effective date of final special
conditions would be 30 days after the date of publication in the
Federal Register; however, as the certification date for the Bombardier
BD-700-1A10 is imminent, the FAA finds that good cause exists to make
these special conditions effective upon issuance.
The substance of the 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. 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 Bombardier BD-700-1A10 airplanes
manufactured by Bombardier.
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 August 14, 1998.
John J. Hickey,
Acting Manager, Transport Airplane Directorate Aircraft Certification
Service, ANM-100.
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[FR Doc. 98-22642 Filed 8-21-98; 8:45 am]
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