[Federal Register Volume 67, Number 99 (Wednesday, May 22, 2002)]
[Rules and Regulations]
[Pages 35895-35897]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 02-12852]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. NM218, Special Conditions No. 25-202-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.

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SUMMARY: These special conditions are issued for Dassault Aviation 
Mystere-Falcon 50 airplanes modified by Garrett Aviation Services. 
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. The modification 
incorporates the installation of dual Electronic Primary Flight Display 
systems 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 provided by the existing 
airworthiness standards.

DATES: The effective date of these special conditions is May 15, 2002. 
Comments must be received on or before June 20, 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. NM218, 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. NM218. 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:

Comments Invited

    The FAA has determined that the substance of these special 
conditions has been subject to the public comment process in several 
prior instances with no substantive comments received; therefore, good 
cause exists for making these special conditions effective upon 
issuance. However, the FAA invites interested persons to participate in 
this rulemaking by submitting 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 April 12, 2002, Garrett Aviation Services, 1200 North Airport 
Drive,

[[Page 35896]]

Capital Airport, Springfield, IL 62707, applied for a supplemental type 
certificate (STC) to modify Dassault Aviation Mystere-Falcon 50 
airplanes approved under Type Certificate No. A46EU. The Dassault 
Aviation Mystere-Falcon 50 is a small transport category airplane. The 
Dassault Aviation Mystere-Falcon 50 airplanes are powered by three 
Turbofan Engines with a maximum takeoff weight of 40,780 pounds. The 
aircraft operate with a 2-pilot crew and can hold up to 19 passengers. 
The modification incorporates the installation of a Rockwell Collins 
ProLine 21 Display System, a Collins AHS-3000 Attitude-Heading 
Reference System, and a Goodrich GH-3000 Electronic Standby Display. 
The ProLine 21 system consists of dual Electronic Primary Flight 
Display systems that replace the existing Primary Flight Display 
systems. These systems 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, Garrett Aviation Services 
must show that the Dassault Aviation Mystere-Falcon 50 airplanes, as 
changed, continue 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. 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 
Dassault Aviation Mystere-Falcon 50 airplanes include 14 CFR part 25, 
dated February 1, 1965, as amended by Amendment 25-1 through Amendment 
25-34 except for special conditions and exceptions noted in Type 
Certificate Data Sheet (TCDS) A46EU.
    If the Administrator finds that the applicable airworthiness 
regulations (that is, 14 CFR part 25, as amended) do not contain 
adequate or appropriate safety standards for the Dassault Aviation 
Mystere-Falcon 50 airplanes because of novel or unusual design 
features, special conditions are prescribed under the provisions of 
 21.16.
    In addition to the applicable airworthiness regulations and special 
conditions, the Dassault Aviation Mystere-Falcon 50 airplanes must 
comply with the fuel vent and exhaust emission requirement of 14 CFR 
part 34 and the noise certification requirement of part 36.
    Special conditions, as defined in 14 CFR 11.19, are issued in 
accordance with  11.38, and become part of the type 
certification basis in accordance with  21.101(b)(2).
    Special conditions are initially applicable to the model for which 
they are issued. Should Garrett Aviation Services apply at a later date 
for a supplemental type certificate to modify any other model already 
included on the same type certificate to incorporate the same novel or 
unusual design features, these special conditions would also apply to 
the other model under the provisions of 14 CFR 21.101(a)(1).

Novel or Unusual Design Features

    The Dassault Aviation Mystere-Falcon 50 airplanes modified by 
Garrett Aviation Services will incorporate dual Electronic Primary 
Flight Display systems that will perform critical functions. The 
modification incorporates the installation of a Rockwell Collins 
ProLine 21 Display System, a Collins AHS-3000 Attitude-Heading 
Reference System, and a Goodrich GH-3000 Electronic Standby Display. 
The ProLine 21 system consists of dual Electronic Primary Flight 
Display systems that replace the existing Primary Flight Display 
systems. These systems have the potential to be vulnerable to high-
intensity radiated fields (HIRF) external to the airplane. The current 
airworthiness standards (14 CFR part 25) do not contain adequate or 
appropriate safety standards for the protection of this equipment from 
the adverse effect 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 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 Dassault Aviation Mystere-Falcon 50 
airplanes modified by Garrett Aviation Services. These special 
conditions require that new avionics/electronics and electrical 
systems, which 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 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 below 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-1GHz..................................          700          100
1 GHz-2 GHz...................................         2000          200
2GHz-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 root-mean-square
  (rms) values over the complete modulation period.


[[Page 35897]]

    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 airplanes modified by Garrett 
Aviation Services. Should Garrett Aviation Services apply at a later 
date for design change approval 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  21.101(a)(1).

Conclusion

    This action affects only certain design features on Dassault 
Aviation Mystere-Falcon 50 airplanes modified by Garrett Aviation 
Services. 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 procedure in several prior 
instances and has been derived without substantive change from those 
previously issued. 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 Dassault Aviation Mystere-Falcon 50 
airplanes modified by Garrett Aviation Services.
    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, May 15, 2002.
Linda Navarro,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 02-12852 Filed 5-21-02; 8:45 am]
BILLING CODE 4910-13-P