[Federal Register Volume 67, Number 14 (Tuesday, January 22, 2002)]
[Rules and Regulations]
[Pages 2793-2795]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 02-1507]



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  Federal Register / Vol. 67, No. 14 / Tuesday, January 22, 2002 / 
Rules and Regulations  

[[Page 2793]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. NM209, Special Conditions No. 25-195-SC]


Special Conditions: Avions Marcel Dassault-Breguet Aviation (AMD/
BA) Model Falcon 10 Airplane; High-Intensity Radiated Fields (HIRF)

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final special conditions; request for comments.

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

SUMMARY: These special conditions are issued for Avions Marcel 
Dassault-Breguet Aviation (AMD/BA) Model Falcon 10 airplanes modified 
by Duncan Aviation, Inc. These modified airplanes will have novel and 
unusual design features when compared to the state of technology 
envisioned in the airworthiness standards for transport category 
airplanes. The modification incorporates the installation of an air 
data display unit that displays critical flight parameters to the 
flightcrew. The applicable airworthiness standards do not contain 
adequate or appropriate safety standards for the protection of these 
systems from the effects of high-intensity radiated fields. The 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 January 9, 
2002. Comments must be received on or before February 21, 2002.

ADDRESSES: Comments on these special conditions may be mailed in 
duplicate to: Federal Aviation Administration, Transport Airplane 
Directorate, Attn: Rules Docket (ANM-113), Docket No. NM209, 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. NM209. 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: 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: The FAA has determined that notice and 
opportunity for prior public comment hereon are impracticable because 
these procedures would significantly delay issuance of the approval 
design and thus delivery of the affected airplanes. 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.

Comments Invited

    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 4:00 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 this 
proposal, 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 November 7, 2001, Duncan Aviation Inc., 15745 South Airport 
Road, Battle Creek, MI, 49015, applied for a supplemental type 
certificate (STC) to modify the Avions Marcel Dassault-Breguet Aviation 
(AMD/BA) Model Falcon 10 airplane listed on Type Certificate A33EU. The 
Model Falcon 10 is a twin engine, small transport airplane. It is 
capable of carrying two flightcrew members and up to nine passengers. 
This model is powered by two Airesearch Manufacturing Company of 
Arizona Model TPE731-2-1C engines. The modification incorporates the 
installation of an air data display system that displays critical 
flight parameters to the flightcrew. These systems can be susceptible 
to disruption to command and/or response signals as a result of 
electrical and magnetic interference. This disruption of signals could 
result in loss of all critical flight displays and announcement 
functions or present misleading information to the pilot.

Type Certification Basis

    Under the provisions of 14 CFR 21.101, Duncan Aviation must show 
that the AMD/BA Model Falcon 10 airplanes, as changed, continue to meet 
the applicable provisions of the regulations incorporated by reference 
in Type Certificate No. A33EU, 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 AMD/BA Model Falcon 10 airplane includes 14 CFR part 25, dated 
February 1, 1965, including Amendments 25-1 through 25-20, as listed in 
the Type Certificate Data Sheet (TCDS) A33EU.
    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 AMD/BA Model

[[Page 2794]]

Falcon 10 airplane 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 Falcon 10 airplane must comply with the part 25 
fuel vent and exhaust emission requirements of 14 CFR part 34 and the 
part 25 noise certification requirements of 14 CFR part 36.
    Special conditions, as defined in Sec. 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).
    Special conditions are initially applicable to the model for which 
they are issued. Should Duncan Aviation, Inc. apply 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).

Novel or Unusual Design Features

    The AMD/BA Model Falcon 10 airplane will incorporate the following 
novel or unusual design feature: an air data display unit that displays 
critical flight parameters to the flightcrew. These systems can be 
susceptible to disruption to command and/or response signals as a 
result of electrical and magnetic interference. This disruption of 
signals could result in loss of all critical flight displays and 
announcement functions or present misleading information to the pilot.

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 avionic/electronic 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 equivalent to that 
intended by the regulations incorporated by reference, special 
conditions are needed for the AMD/BA Model Falcon 10 as modified by 
Duncan Aviation Inc. These special conditions require that new avionic/
electronic and electrical systems such as the air data display unit, 
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 paragraph 2, below:
    1. A minimum threat of 100 volts rms 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 Table 1 for the frequency ranges indicated. Both peak and 
average field strength components from Table 1 are to be demonstrated.

                                 Table 1
------------------------------------------------------------------------
                                                        Field Strength
                                                       (volts per meter)
                      Frequency                      -------------------
                                                        Peak     Average
------------------------------------------------------------------------
10kHz-100 kHz.......................................        50        50
100kHz-500 kHz......................................        50        50
500 kHz-2MHz........................................        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
------------------------------------------------------------------------
Note.--The field strengths are expressed in terms of peak of the root-
  mean-square (rms) over the complete modulation period.

    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 the 
Avions Marcel Dassault-Breguet Aviation (AMD/BA) Model Falcon 10 
airplane modified by Duncan Aviation, Inc. Should Duncan 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 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 AMD/BA Model Falcon 10 airplanes modified by Duncan Aviation, Inc. 
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 period 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 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 Avions Marcel Dassault-Breguet 
Aviation (AMD/BA) Model Falcon 10 airplanes modified by Duncan 
Aviation, Inc.
    1. Protection from Unwanted Effects of High-Intensity Radiated 
Fields

[[Page 2795]]

(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 January 9, 2002.
Ali Bahrami,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 02-1507 Filed 1-18-02; 8:45 am]
BILLING CODE 4910-13-U