[Federal Register Volume 67, Number 159 (Friday, August 16, 2002)]
[Rules and Regulations]
[Pages 53463-53465]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 02-20883]



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  Federal Register / Vol. 67, No. 159 / Friday, August 16, 2002 / Rules 
and Regulations  

[[Page 53463]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. NM227; Special Conditions No. 25-208-SC]


Special Conditions: Dassault Aviation Mystere Falcon 50; 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 Haycock & Associates LLC. 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 Universal Avionics Systems Corporation 
EFI-640 Electronic Flight Instruments that perform 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 July 29, 2002. 
Comments must be received on or before September 16, 2002.

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. NM227, 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. NM227. 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: Meghan Gordon, FAA, Standardization 
Branch, ANM-113, Transport Airplane Directorate, Aircraft Certification 
Service, 1601 Lind Avenue SW., Renton, Washington 98055-4056; telephone 
(425) 227-2138; facsimile (425) 227-1149.

SUPPLEMENTARY INFORMATION:

Comments Invited

    The FAA has determined that notice and opportunity for prior public 
comment hereon are 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 in light of 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 June 5, 2002, Haycock & Associates LLC, 2558 Rittenour Court, 
Blacklick, Ohio, applied for a Supplemental Type Certificate (STC) to 
modify Dassault Aviation Mystere Falcon 50 (Falcon 50) aircraft. The 
Falcon 50 is a small transport category airplane. The Falcon 50 
airplanes are powered by three Honeywell (Garrett) TFE-731-3-1C 
turbofans, and have a maximum takeoff weight of 38,800 pounds (40,780 
pounds with Service Bulletin F50-191). This airplane operates with a 2-
pilot crew and can hold up to 19 passengers. The modification 
incorporates the installation of Universal Avionics Systems Corporation 
EFI-640 Electronic Flight Instruments. The EFI-640 displays are 
replacements for the mechanical heading (HSI) and attitude (ADI) 
instruments. The avionics/electronics and electrical systems installed 
in this airplane have 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, Amendment 21-69, effective 
September 16, 1991, Haycock & Associates LLC must show that the Falcon 
50 as changed, continues 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. Subsequent changes have been made to Sec. 21.101 as part of 
Amendment 21-77, but those changes do not become effective until June 
10, 2003. The regulations incorporated by reference in the type 
certificate are commonly referred to as the ``original type 
certification basis.'' The regulations included in the certification 
basis for the Falcon 50 airplanes include 14 CFR 21.29; 14 CFR part 25 
effective February 1, 1965, as amended by amendments 25-1 through 25-
34; Sec. 25.255, as amended by amendment 25-42;

[[Page 53464]]

Sec. Sec. 25.979(d) and (e), as amended by amendment 25-38; 
Sec. 25.1013(b)(1), as amended by amendment 25-36; Sec. 25.1351(d), as 
amended by amendment 25-41; and Sec. 25.1353, as amended by amendment 
25-42. In addition, the certification basis includes Special Conditions 
25-86-EU-24, and additional requirements listed in the type certificate 
data sheet 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 airplanes modified by Haycock & Associates LLC 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, these 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(b)(2), Amendment 21-69, effective 
September 16, 1991.
    Special conditions are initially applicable to the model for which 
they are issued. Should Haycock & Associates LLC apply at a later date 
for a supplemental type certificate to modify any other model 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), Amendment 21-69, 
effective September 16, 1991.

Novel or Unusual Design Features

    As noted earlier, the Dassault Aviation Mystere Falcon 50 airplanes 
modified by Haycock & Associates LLC will incorporate dual Electronic 
Primary Flight Displays that will perform critical functions. This 
system may be vulnerable to high-intensity radiated fields 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 that is equivalent to 
that intended by the regulations incorporated by reference, special 
conditions are needed for the Dassault Aviation Mystere Falcon 50 
airplanes modified by Haycock & Associates LLC. 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.

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 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 in accordance 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 
indicated 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.


[[Page 53465]]

    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 modified by Haycock & Associates 
LLC. Should Haycock & Associates LLC apply at a later date for a 
supplemental type certificate to modify any other model included on 
Type Certificate A46EU 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), Amendment 21-69, effective 
September 16, 1991.

Conclusion

    This action affects only certain features on Dassault Aviation 
Mystere Falcon 50 airplanes modified by Haycock & Associates LLC. 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 Haycock & Associates LLC.
    1. Protection from Unwanted Effects of High-Intensity Radiated 
Fields (HIRF). Each electrical and of electronic system that performs 
critical functions must be designed and installed to ensure that the 
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 July 29, 2002.
Ali Bahrami,
Acting Manager, Transport Airplane Directorate Aircraft Certification 
Service.
[FR Doc. 02-20883 Filed 8-15-02; 8:45 am]
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