Source: https://www.federalregister.gov/documents/2007/01/10/E7-197/special-conditions-gulfstream-aerospace-corporation-model-g-1159a-airplanes-high-intensity-radiated
Timestamp: 2018-03-18 20:12:53
Document Index: 14066764

Matched Legal Cases: ['art 25', '§\u200925', '§\u200925', '§\u200925', '§\u200925', 'art 27', '§\u200925', 'art 25', '§\u200921', 'art 34', 'art 36', 'art 25', '§\u200921']

Federal Register :: Special Conditions: Gulfstream Aerospace Corporation Model G-1159A Airplanes; High-Intensity Radiated Fields (HIRF)
Special Conditions: Gulfstream Aerospace Corporation Model G-1159A Airplanes; High-Intensity Radiated Fields (HIRF)
A Rule by the Federal Aviation Administration on 01/10/2007
The effective date of these special conditions is December 29, 2006. We must receive your comments on or before February 9, 2007.
72 FR 1137
1137-1139 (3 pages)
Docket No. NM363
Special Conditions No. 25-344-SC
https://www.federalregister.gov/d/E7-197 https://www.federalregister.gov/d/E7-197
The FAA issues these special conditions for a Gulfstream Aerospace Corporation Model G-1159A airplane modified by AeroMech Incorporated. This modified airplane 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 Innovative Solutions and Support integrated air data display units (ADDU). These systems 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.
You may mail or deliver comments on these special conditions in duplicate to: Federal Aviation Administration, Transport Airplane Directorate, Attention: Rules Docket (ANM-113), Docket No. NM363, 1601 Lind Avenue, SW., Renton, Washington 98057-3356. You must mark your comments Docket No. NM363.
We will consider all comments we receive on or before the closing date for Start Printed Page 1138comments. We will consider comments filed late if it is possible to do so without incurring expense or delay. We may change these special conditions based on the comments we receive.
On September 29, 2006, AeroMech Incorporated, 1616 Hewitt Avenue, Suite 312, Everett, Washington 98201, applied for a supplemental type certificate (STC) to modify a Gulfstream Aerospace Corporation model G-1159A airplane. The Gulfstream Aerospace Corporation Model G-1159A airplane is a small transport category airplane powered by two turbine engines. It operates with a 2-pilot crew and can seat up to 15 passengers. The modification incorporates the installation of Innovative Solutions and Support integrated air data display units. These systems have a potential to be vulnerable to high-intensity radiated fields (HIRF) external to the airplane.
Under the provisions of 14 CFR 21.101, AeroMech Incorporated must show that Gulfstream Aerospace Corporation Model G-1159A airplane, as changed, continues to meet the applicable provisions of the regulations incorporated by reference in Type Certificate No. A12EA, 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 specific regulations are 14 CFR part 25 as amended by Amendments 25-1 through 25-8, 25-10, 25-12, 25-16 through 25-22, 25-24, 25-26, 25-27, 25-29 through 25-34, 25-37, 25-40 (as applicable to a new APU installation); § 25.1309 as amended by Amendment 25-41, and § 25.1329 (as applied to a new autopilot installation), § 25.994 (crashworthiness fuel system components), and § 25.581 (lightning protection), as amended by Amendment 25-23; and Special part 27, as amended by Amendment 27-2 (fuel venting emission). The special conditions contained in the FAA's letter to Grumman dated September 27, 1965, applicable to the Gulfstream Model G-1159 airplane, are also applicable to the Gulfstream Model G-1159A airplane, except that reference to Civil Air Regulations 4b.450 in the “Cooling Systems” special conditions is replaced by § 25.1043, effective February 1, 1965. In addition, the special conditions pertaining to dynamic gust loads contained in the FAA AEA-212 letter dated July 22, 1980.
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 Gulfstream Aerospace Corporation Model G-1159A airplane because of a novel or unusual design feature, special conditions are prescribed under § 21.16.
In addition to the applicable airworthiness regulations and special conditions, Gulfstream Aerospace Corporation Model G-1159A airplane 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.
As noted earlier, Gulfstream Aerospace Corporation G-1159A airplane modified by AeroMech Incorporated will incorporate Innovative Solutions and Support integrated air data display units that will perform critical functions. These systems may be vulnerable to high-intensity radiated fields external to the airplane. Current airworthiness standards of part 25 do not contain adequate or appropriate safety standards for protecting this equipment from adverse effects of HIRF. So 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 Gulfstream Aerospace Corporation G-1159A airplane modified by AeroMech Incorporated. 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 because of HIRF.
Based on surveys and analysis of existing HIRF emitters, an adequate level of protection exists when airplane system immunity is demonstrated when exposed to the HIRF environments in either paragraph 1 OR 2 below:
The environmental levels identified above are the result of an FAA review of existing studies on the subject of HIRF and of the work of the Electromagnetic Effects Harmonization Working Group of the Aviation Rulemaking Advisory Committee.
These special conditions are applicable to a Gulfstream Aerospace Start Printed Page 1139Corporation Model G-1159A airplane modified by AeroMech Incorporated. Should AeroMech Incorporated apply at a later date for a supplemental type certificate to modify any other similar model included on Type Certificate No. A12EA to incorporate the same or similar novel or unusual design feature, these special conditions would apply to that model as well under § 21.101.
This action affects only certain novel or unusual design features on a Gulfstream Aerospace Corporation Model G-1159A airplane modified by AeroMech Incorporated. 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.
Therefore, under the authority delegated to me by the Administrator, the following special conditions are issued as part of the supplemental type certification basis for the Gulfstream Aerospace Corporation Model G-1159A airplane modified by AeroMech Incorporated.
Issued in Renton, Washington, on December 29, 2006.
[FR Doc. E7-197 Filed 1-9-07; 8:45 am]