[Federal Register Volume 61, Number 104 (Wednesday, May 29, 1996)]
[Rules and Regulations]
[Pages 26775-26776]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-13426]



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Rules and Regulations
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Federal Register / Vol. 61, No. 104 / Wednesday, May 29, 1996 / Rules 
and Regulations

[[Page 26775]]



DEPARTMENT OF TRANSPORTATION

Federation Aviation Administration

14 CFR Part 25

[Docket No. NM-126; Special Conditions No. 25-ANM-16]


Special Conditions: Dassault Aviation, Mystere Falcon 50 
Airplane; High-Intensity Radiated Fields

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final special conditions; request for comments.

-----------------------------------------------------------------------

SUMMARY: These special conditions are issued for the Dassault Aviation, 
Mystere Falcon 50 airplane modified by Garrett Aviation Services of 
Springfield, Illinois. This airplane will be equipped with a Collins 
EFIS-86C(14) Electronic Flight Instrument System that provides critical 
data to the flightcrew. The applicable regulations do not contain 
adequate or appropriate safety standards for the position of these 
systems from the effects of high-intensity radiated fields. 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 May 21, 1996. 
Comments must be received on or before July 15, 1996.

ADDRESSES: Comments on these final special conditions, request for 
comments, may be mailed in duplicate to: Federal Aviation 
Administration, Office of the Assistant Chief Counsel, Attn: Rules 
Docket (ANM-7), Docket No. NM-126, 1601 Lind Avenue SW., Renton, 
Washington, 98055-4056; or delivered in duplicate to the Office of the 
Assistant Chief Counsel at the above address. Comments must be marked: 
Docket No. NM-126. Comments may be inspected in the Rules Docket 
weekdays, except Federal holidays, between 7:30 a.m. and 4:00 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 (206) 227-2796; facsimile 
(206) 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 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 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. NM-126.'' The postcard will 
be date stamped and returned to the commenter.

Background

    On March 7, 1996, Garrett Aviation Services of Springfield, 
Illinois, applied for a supplemental type certificate to modify 
Dassault Aviation, Mystere Falcon 50 airplanes. The Dassault Aviation, 
Mystere Falcon 50 is a business jet with three aft mounted turbine 
engines. The airplane can carry three crew and 19 passengers depending 
on the configuration, and is capable of operating to an altitude of 
49,000 feet. The proposed modification incorporates the installation of 
a Collins EFIS-86C(14) Electronic Flight Instrument System (EFIS)), 
which is potentially vulnerable to high-intensity radiated fields 
(HIRF) external to the airplane.

Supplemental Type Certification Basis

    Under the provisions of Sec. 21.101 of the Federal Aviation 
Regulations (FAR), Garrett Aviation Services must show that the altered 
Dassault Aviation, Mystere Falcon 50 airplane continues to meet the 
applicable provisions of Sec. 21.29; and part 25, effective February 1, 
1965, as amended by Amendments 25-1 through 25-34 and Sec. 25.255 of 
Amendments 25-42; Sec. 25.979(d) and (e) of Amendments 25-38; 
Sec. 25.1013(b)(1) of Amendments 25-36; Sec. 25.1351(d) of Amendments 
25-41; Sec. 25.1353(c)(6) of Amendments 25-42; part 36 of the FAR 
effective December 1, 1969, as amended through Amendment 36-9; Special 
Federal Aviation Regulations (SFAR) 27 effective February 1, 1974, as 
amended through Amendment SFAR 27-1; and Special Conditions 25-86-EU-
24. In addition, the certification basis may include other special 
conditions 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 Dassault Aviation, Mystere Falcon 
50 airplane 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, 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 Dassault Aviation, Mystere Falcon 50 airplane incorporates a 
Collins EFIS-86c(14) system that provides critical date to the 
flightcrew. This system may be vulnerable to HIRF external to the 
airplane.

[[Page 26776]]

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 issued for the Dassault Aviation, Mystere Falcon 50, 
which would require that new technology electrical and electronic 
systems, such as the EFIS, etc., 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 HIFR 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 paragraphs 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.

------------------------------------------------------------------------
                                                      Peak  (V/  Average
                      Frequency                          M)       (V/M) 
------------------------------------------------------------------------
10 KHz-100 KHz......................................        50        50
100 KHz-500 KHz.....................................        60        60
500 KHz-2000 KHz....................................        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.....................................     4,020       935
700 MHz-1000 MHz....................................     1,700       170
1 GHz-2 GHz.........................................     5,000       990
2 GHz-4 GHz.........................................     6,680       840
4 GHz-6 GHz.........................................     6,850       310
6 GHz-8 GHz.........................................     3,600       670
8 GHz-12 GHz........................................     3,500     1,270
12 GHz-18 GHz.......................................     3,500       360
18 GHz-40 GHz.......................................     2,100       750
------------------------------------------------------------------------

    As discussed above, these special conditions would be applicable 
initially to the Garrett Aviation Services modified Dassault Aviation, 
Mystere Falcon 50. Should Garrett Aviation Services apply at a later 
date for a change to the supplemental 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 the Dassault 
Aviation, Mystere Falcon 50 airplane. It is not a rule of general 
applicability and affects only the manufacturer who applied to the FAA 
for approval of these features on the airplane.
    The substance of these 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, the following special conditions are issued as part of 
the supplemental type certification basis for the Garrett Aviation 
Services modified Dassault Aviation, Mystere Falcon 50 series 
airplanes.
    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 May 21, 1996.

Norman B. Martenson,

Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service, ANM-100.

[FR Doc. 96-13426 Filed 5-28-96; 8:45 am]

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