Source: https://www.federalregister.gov/documents/2003/10/22/03-26559/special-conditions-cessna-aircraft-company-cessna-model-500-airplanes-high-intensity-radiated-fields
Timestamp: 2017-09-24 16:55:31
Document Index: 746105512

Matched Legal Cases: ['art 25', 'art 25', '§\u200921', 'art 34', 'art 36', 'art 25']

Federal Register :: Special Conditions: Cessna Aircraft Company Cessna Model 500 Airplanes; High Intensity Radiated Fields (HIRF)
A Rule by the Federal Aviation Administration on 10/22/2003
The effective date of these special conditions is October 14, 2003. Comments must be received on or before November 21, 2003.
Docket No. NM268, Special Conditions No. 25-252-SC
Type of Certification Basis
https://www.federalregister.gov/d/03-26559 https://www.federalregister.gov/d/03-26559
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These special conditions are issued for Cessna Aircraft Company Cessna Model 500 airplanes modified by Honeywell International, 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 dual Honeywell RVSM (reduced vertical separation minimum)-capable AM-250 electronic barometric altimeters. 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.
Comments on these special conditions may be mailed in duplicate to: Federal Aviation Administration, Transport Airplane Directorate, Attn: Rules Docket (ANM-113), Docket No. NM268, 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. NM268.
Greg Dunn, FAA, Airplane and Flight Crew Interface Branch, ANM-111, Transport Airplane Directorate, Aircraft Certification Service, 1601 Lind Avenue SW., Renton, Washington, 98055-4056; telephone (425) 227-2799; facsimile (425) 227-1320.
We will file in the docket all comments were 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.
On June 12, 2003, Honeywell International, Inc., 23500 W. 105th St., Olathe, KS 66061, applied for a supplemental type certificate (STC) to modify Cessna (Citation) Model 500 airplanes. This model is currently approved under Type Certificate No. A22CE. The Cessna Model 500 airplanes are executive type transports that have two aft mounted turbine engines, a minimum passenger load of 9 passengers, and a maximum operating speed of 260 to 287 knots, depending on altitude. The modification, under one supplemental type certificate (STC) project, incorporates the installation of dual Honeywell RVSM-capable AM-250 electronic barometric altimeters.
The dual Honeywell AM-250 barometric altimeters provide the aircraft baro-corrected altitude information, also corrected for static source error (SSE), which enables the aircraft to be capable of RVSM operations. The dual AM-250 barometric altimeters replace the existing pilot and copilot pneumatic altimeters. Since the AM-250 altimeters use electronics to transmit altimeter data to the pilots, as well as to other equipment, they may be susceptible to electrical and magnetic interference caused by high-intensity radiated fields (HIRF). This disruption of signals could result in misleading altimeter information to the pilots or loss of altimeter information.
Under the provisions of 14 CFR 21.101, Honeywell International, Inc. must show that the Cessna Model 500 airplanes, as changed, continue to meet the applicable provisions of the regulations incorporated by reference in Type Certificate No. A22CE 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 “the original type certification basis.” The certification basis for the modified Cessna Model 500 airplanes includes Part 25 of the Federal Aviation Regulations effective February 1, 1965, as amended by Amendments 25-1 through 25-17. Other applicable amendments, Federal aviation regulations, and special conditions are Start Printed Page 60282also noted in Type Certificate Data Sheet (TCDS) A22CE.
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 Cessna Model 500 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 Cessna Model 500 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 are initially applicable to the model for which they are issues. Should Honeywell International, Inc. 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.
The Cessna Model 500 airplanes will incorporate, under one supplemental type certificate (STC) project, the installation of dual Honeywell AM-250 barometric altimeters. Because these altimeters use electronics to a far greater extent than the original pneumatic or servo altimeters, they may be more susceptible to electrical and magnetic interference caused by 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 that address protecting this equipment from the adverse effects of HIRF. Accordingly, these instruments are considered to be a novel or unusual design feature.
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 Cessna Model 500 airplanes modified to include the new altimeters. These special conditions will require that the new Honeywell AM-250 barometric altimeters, 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.
As discussed above, these special conditions are applicable to Cessna Model 500 airplanes modified by Honeywell International, Inc. to include dual Honeywell AM-250 barometric altimeters. should Honeywell International, Inc. apply at a later date for a supplemental type certificate to modify any other model already included on Type Certificate A22CE to incorporate; the same novel or unusual design features, these special conditions would apply to that model as well under the provisions of 14 CFR 21.101.
This action affects only certain design features on Cessna Model 500 airplanes modified by Honeywell International, 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.
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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 Cessna model 500 airplanes modified by Honeywell International, Inc.
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.
[FR Doc. 03-26559 Filed 10-21-03; 8:45 am]