[Federal Register Volume 65, Number 94 (Monday, May 15, 2000)]
[Proposed Rules]
[Pages 30936-30938]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 00-12142]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 23
[Docket No. CE161; Notice No. 23-00-02-SC]
Special Conditions: Installation of Full Authority Digital Engine
Control (FADEC) System on Morrow Aircraft Corporation Model MB-300
Airplane
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed special conditions.
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SUMMARY: This notice proposes special conditions for the Morrow
Aircraft Corporation Model MB-300, which will use a FADEC System. This
airplane will have a novel or unusual design feature associated with
the installation of an engine that uses an electronic engine control
system in place of the engine's mechanical system. The applicable
airworthiness regulations do not contain adequate or appropriate safety
standards for this design feature. These proposed 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: Comments must be received on or before June 14, 2000.
ADDRESSES: Comments on this proposal may be mailed in duplicate to:
Federal Aviation Administration, Regional Counsel, ACE-7, Attention:
Rules Docket, Docket No. CE161, DOT Building, 901 Locust, Kansas City,
Missouri 64106, or delivered in duplicate to the Regional Counsel at
the above address. Comments must be marked: Docket No. CE161. Comments
may be inspected in the Rules Docket weekdays, except Federal holidays,
between 7:30 a.m. and 4 p.m.
FOR FURTHER INFORMATION CONTACT: Randy Griffith, Aerospace Engineer,
Federal Aviation Administration, Aircraft Certification Service, Small
Airplane Directorate, ACE-111, 901 Locust, Room 301, Kansas City,
Missouri, 816-329-4126, fax 816-329-4090.
SUPPLEMENTARY INFORMATION:
Comments Invited
Interested persons are invited to participate in the making of
these proposed special conditions by submitting such written data,
views, or arguments as they may desire. Communications should identify
the
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regulatory docket or notice 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. The
proposals described in this notice may be changed in light of the
comments received. All comments received 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 notice must include with those
comments a self-addressed, stamped postcard on which the following
statement is made: ``Comments to Docket No. CE161.'' The postcard will
be date stamped and returned to the commenter.
Background
On March 5, 1999, Morrow Aircraft Corporation applied for a type
certificate for the Model MB-300 airplane. The Model MB-300 is a small,
normal category airplane. The airplane is powered by two reciprocating
engines equipped with an electronic engine control system with full
authority capability in place of the hydromechanical control system.
Type Certification Basis
Under the provisions of 14 CFR 21.17, Morrow Aircraft Corporation
must show that the Model MB-300 meets the applicable provisions of 14
CFR part 23, as amended by Amendments 23-1 through 23-53 thereto.
If the Administrator finds that the applicable airworthiness
regulations (i.e., 14 CFR part 23) do not contain adequate or
appropriate safety standards for the Model MB-300 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 MB-300 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, and the FAA must issue a finding of
regulatory adequacy pursuant to section 611 of Public Law 92-574, the
``Noise Control Act of 1972.''
Special conditions, as appropriate, are issued in accordance with
Sec. 11.49 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 Morrow Model MB-300 will incorporate the following novel or
unusual design features:
The Morrow Model MB-300 airplane will use engines that include an
electronic control system with full engine authority capability.
Many advanced electronic systems are prone to either upsets or
damage, or both, at energy levels lower than analog systems. The
increasing use of high power radio frequency emitters mandates
requirements for improved high intensity radiated fields (HIRF)
protection for electrical and electronic equipment. Since the
electronic engine control system used on the Morrow Model MB-300 will
perform critical functions, provisions for protection from the effects
of HIRF fields should be considered and, if necessary, incorporated
into the airplane design data. The FAA policy contained in Notice
8110.71, dated April 2, 1998, establishes the HIRF energy levels that
airplanes will be exposed to in service. The guidelines set forth in
this Notice are the result of an Aircraft Certification Service review
of existing policy on HIRF, in light of the ongoing work of the ARAC
Electromagnetic Effects Harmonization Working Group (EEHWG). The EEHWG
adopted a set of HIRF environment levels in November 1997 that were
agreed upon by the FAA, JAA, and industry participants. As a result,
the HIRF environments in this notice reflect the environment levels
recommended by this working group. This notice states that a full
authority digital engine control is an example of a system that should
address the HIRF environments.
Even though the control system will be certificated as part of the
engine, the installation of an engine with an electronic control system
requires evaluation due to the possible effects on or by other airplane
systems (e.g., radio interference with other airplane electronic
systems, shared engine and airplane power sources). The regulatory
requirements in 14 CFR part 23 for evaluating the installation of
complex systems, including electronic systems, are contained in
Sec. 23.1309. However, when Sec. 23.1309 was developed, the use of
electronic control systems for engines was not envisioned; therefore,
the Sec. 23.1309 requirements were not applicable to systems
certificated as part of the engine (reference Sec. 23.1309(f)(1)).
Also, electronic control systems often require inputs from airplane
data and power sources and outputs to other airplane systems (e.g.,
automated cockpit powerplant controls such as mixture setting).
Although the parts of the system that are not certificated with the
engine could be evaluated using the criteria of Sec. 23.1309, the
integral nature of systems such as these makes it unfeasible to
evaluate the airplane portion of the system without including the
engine portion of the system. However, Sec. 23.1309(f)(1) again
prevents complete evaluation of the installed airplane system since
evaluation of the engine system's effects is not required.
Therefore, special conditions are proposed for the Morrow Model MB-
300 to provide HIRF protection and to evaluate the installation of the
electronic engine control system for compliance with the requirements
of Sec. 23.1309(a) through (e) at Amendment 23-53.
Applicability
As discussed above, these special conditions are applicable to the
Morrow Model MB-300. Should Morrow Aircraft Corporation 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 novel or unusual design features
on one model, the Morrow Model MB-300 airplane. It is not a rule of
general applicability, and it affects only the applicant who applied to
the FAA for approval of these features on the airplane.
List of Subjects in 14 CFR Part 23
Aircraft, Aviation safety, Signs and symbols.
Authority: The authority citation for these special conditions
in part 23 is as follows:
Authority: 49 U.S.C. 106(g), 40113 and 44701; 14 CFR 21.16 and
21.17, and 14 CFR 11.28 and 11.29(b).
The Proposed Special Conditions
Accordingly, the Federal Aviation Administration (FAA) proposes the
following special conditions as part of the type certification basis
for Morrow Model MB-300 airplane.
1. High Intensity Radiated Fields (HIRF) Protection. In showing
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compliance with 14 CFR part 21 and the airworthiness requirements of 14
CFR part 23, protection against hazards caused by exposure to HIRF
fields for the full authority digital engine control system which
performs critical functions, must be considered. To prevent this
occurrence, the electronic engine control system must be designed and
installed to ensure that the operation and operational capabilities of
this critical system are not adversely affected when the airplane is
exposed to high energy radio fields.
At this time, the FAA and other airworthiness authorities are
unable to precisely define or control the HIRF energy level to which
the airplane will be exposed in service; therefore, the FAA hereby
defines two acceptable interim methods for complying with the
requirement for protection of systems that perform critical functions.
(1) The applicant may demonstrate that the operation and
operational capability of the installed electrical and electronic
systems that perform critical functions are not adversely affected when
the aircraft is exposed to the external HIRF threat environment defined
in the following table:
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Field strength (volts
----------------------------------------------- per meter)
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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
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The field strengths are expressed in terms of peak root-mean-square
(rms) values.
or,
(2) The applicant may demonstrate by a system test and analysis
that the electrical and electronic systems that perform critical
functions can withstand a minimum threat of 100 volts per meter peak
electrical strength, without the benefit of airplane structural
shielding, in the frequency range of 10 KHz to 18 GHz. When using this
test to show compliance with the HIRF requirements, no credit is given
for signal attenuation due to installation. Data used for engine
certification may be used, when appropriate, for airplane
certification.
2. Electronic Engine Control System. The installation items that
affect the electronic engine control system must comply with the
requirements of Sec. 23.1309(a) through (e) including applicable
amendments through Amendment 23-53. Data used for engine certification
may be used, when appropriate, for airplane certification.
Issued in Kansas City, Missouri on April 28, 2000.
Michael Gallagher,
Manager, Small Airplane Directorate, Aircraft Certification Service.
[FR Doc. 00-12142 Filed 5-12-00; 8:45 am]
BILLING CODE 4910-13-P