Source: https://www.federalregister.gov/documents/2003/08/18/03-21106/special-conditions-israel-aircraft-industries-model-1124-airplanes-high-intensity-radiated-fields
Timestamp: 2018-07-18 19:00:46
Document Index: 773139106

Matched Legal Cases: ['§\u200925', '§\u200925', '§\u200933', '§\u200933', 'art 25', '§\u200925', 'art 25', '§\u200921', 'art 34', 'art 36', 'art 25']

The effective date of these special conditions is August 7, 2003. Comments must be received on or before September 17, 2003.
Docket No. NM261
Special Conditions No. 25-243-SC
https://www.federalregister.gov/d/03-21106 https://www.federalregister.gov/d/03-21106
These special conditions are issued for Israel Aircraft Industries Model 1124 airplanes modified by Avionics Certification Services. 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 a dual Innovative Solutions and Support Air Data Display Unit system that performs critical functions. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for the protection of this system 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.
Comments on these special conditions may be mailed in duplicate to: Federal Aviation Administration, Transport Airplane Directorate, Attention: Rules Docket (ANM-113), Docket No. NM261, 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. NM261.
Steven R. Edgar, FAA, Standardization Branch, ANM-113, Transport Airplane Directorate, Aircraft Certification Service, 1601 Lind Avenue SW., Renton, Washington 98055-4056; telephone (425) 227-2025; facsimile (425) 227-1149.
On February 1, 2003, Avionics Certification Services, 1675 Turnberry Drive, San Marcos, California, applied for a Supplemental Type Certificate (STC) to modify Israel Aircraft Industries Model 1124 airplanes. These models are currently approved under Type Certificate No. A2SW. The Model 1124 is a transport category airplane powered by two Garrett AiResearch TFE-731-3-1G turbofan engines and has a maximum takeoff weight of 23,500 pounds. This airplane operates with a 2-pilot crew and can hold up to 10 passengers. The modification incorporates the installation of a dual Innovative Solutions and Support Air Data Display Unit (ADDU) system. The ADDU system is a replacement for the pneumatic altimeters. 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.
Under the provisions of 14 CFR 21.101, Avionics Certification Services must show that the Israel Aircraft Industries Model 1124, as changed, continues to meet the applicable provisions of the regulations incorporated by reference in Type Certificate No. A2SW, or the applicable regulations in effect on the date of Start Printed Page 49333application 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 Model 1124 airplanes includes 14 CFR 21.29; CAR 4b effective December 31, 1953, including amendments 4b-1 through 4b-11, and 4b-12; paragraphs 4b.132(e), 4b.151(a), 4b.155, 4b.156, 4b.157, 4b.158, 4b.160, 4b.162, 4b.191, 4b.210(b)(5), 4b.603(k); 4b.711; and paragraphs pertaining to engine fire shielding. In addition, the certification basis includes Special Regulations (SR) SR 422b, effective July 9, 1959; SR 450A, effective August 31, 1962; § 25.771 as amended by Amendment 25-4; § 25.2 as amended by Amendments 25-15, 25-17, and 25-20; § 33.97, as amended by Amendment 33-3, and § 33.99; Special Conditions specified in FAA letters of December 13, 1963, and June 2, 1964; Special Conditions 25-37-EU-8, dated November 16, 1971; and Special FAR 27 effective January 1, 1974; and the following 14 CFR part 25 sections, as amended by Amendments 25-1 through 25-34, which replaced the corresponding CAR 4b paragraphs: §§ 25.831 through 25.843, 25.901 through 25.1203, 25.1305, 25.1521, and 25.1309 with respect to reverse thrust installation.
If the Administrator finds that the applicable airworthiness regulations (i.e., CAR 4b or part 25, as amended) do not contain adequate or appropriate safety standards for the Israel Aircraft Industries Model 1124 airplanes because of a novel or unusual design feature, special conditions are prescribed under the provisions of § 21.16.
In addition to the applicable airworthiness regulations and special conditions, the Israel Aircraft Industries Model 1124 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 are initially applicable to the model for which they are issued. Should Avionics Certification Services apply at a later date for a supplemental type certificate to modify any other model included on Type Certificate No. A2SW to incorporate the same or similar novel or unusual design feature, these special conditions would also apply to the other model.
As noted earlier, the Israel Aircraft Industries Model 1124 airplanes modified by Avionics Certification Services will incorporate a dual Air Data Unit Display system 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.
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 Israel Aircraft Industries Model 1124 airplanes modified by Avionics Certification Services. 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.
As discussed above, these special conditions are applicable to Israel Aircraft Industries Model 1124 airplanes modified by Avionics Certification Services. Should Avionics Certification Services apply at a later date for a supplemental type certificate to modify any other model included on Type Certificate No. A2SW to incorporate the same or similar novel or unusual design feature, these special conditions would apply to that model as well.
This action affects only certain novel or unusual design features on Israel Aircraft Industries Model 1124 airplanes modified by Avionics Certification 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.
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 Israel Aircraft Industries Model 1124 airplanes modified by Avionics Certification Services.
[FR Doc. 03-21106 Filed 8-15-03; 8:45 am]