Source: https://www.federalregister.gov/documents/2003/09/19/03-23970/special-conditions-douglas-models-dc-8-61--61f--63--63f--71--71f--72--72f--73-and--73f-airplanes
Timestamp: 2018-03-20 16:47:22
Document Index: 730832213

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

Federal Register :: Special Conditions: Douglas Models DC-8-61, -61F, -63, -63F, -71, -71F, -72, -72F, -73, and -73F Airplanes; High Intensity Radiated Fields (HIRF)
Special Conditions: Douglas Models DC-8-61, -61F, -63, -63F, -71, -71F, -72, -72F, -73, and -73F Airplanes; High Intensity Radiated Fields (HIRF)
A Rule by the Federal Aviation Administration on 09/19/2003
The effective date of these special conditions is September 10, 2003. Comments must be received on or before October 20, 2003.
68 FR 54800
Docket No. NM265, Special Conditions No. 25-247-SC
03-23970
https://www.federalregister.gov/d/03-23970 https://www.federalregister.gov/d/03-23970
These special conditions are issued for Douglas Models DC-8-61, -61F, -63, -63F, -71, -71F, -72, -72F, -73, and -73F airplanes modified by ABX Air, Inc. These airplanes, as modified by ABX Air, Inc., 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 the Innovative Solutions and Support (IS&S) Duplex Reduced Vertical Separation Minimum (RVSM) system which will allow for the removal of the existing altitude alerter, encoding altimeters, air data computer, and standby altimeter. 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. NM265, 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. NM265.
On November 25, 2002, ABX Air Inc. applied for a supplemental type certificate (STC) to modify Douglas Models DC-8-61, -61F, -63, -63F, -71, -71F, -72, -72F, -73, and -73F airplanes. These models are currently approved under Type Certificate 4A25. The modification incorporates the installation of the IS&S Duplex RVSM system which will allow for the removal of the existing altitude alerter, encoding altimeters, air data computer, and standby altimeter. This system uses two Air Data Display Units (ADDU) and a single Analog Interface Unit (AIU) to replace altitude displays and the air data computer. These displays can be susceptible to disruption to both command and response signals as a result of electrical and magnetic interference. This disruption of signals could result in the loss of all critical flight information displays and annunciations or the presentation of misleading information to the pilot.
Under the provisions of 14 CFR 21.101, ABX Air Inc. must show that Douglas Models DC-8-61, -61F, -63, -63F, -71, -71F, -72, -72F, -73, and -73F airplanes, as changed, continue to meet the applicable provisions of the regulations incorporated by reference in Type Certificate No. 4A25, 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 Douglas Models DC-8-61, -61F, -63, -63F, -71, -71F, -72, -72F, -73, and -73F airplanes include 14 CFR part 25 effective February 1, 1965 as described in Type Certificate Data Sheet 4A25. Start Printed Page 54801
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 Douglas Models DC-8-61, -61F, -63, -63F, -71, -71F, -72, -72F, -73, and -73F 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 Douglas Models DC-8-61, -61F, -63, -63F, -71, -71F, -72, -72F, -73, and -73F 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 models for which they are issued. Should ABX Air, Inc., apply at a later date for a supplemental type certificate to modify any other models included on Type certificate No. 4A25 to incorporate the same or similar novel or unusual design feature, the special conditions would also apply to the other model under the provisions of § 21.101.
The modified Douglas Models DC-8-61, -61F, -63, -63F, -71, -71F, -72, -72F, -73, and -73F airplanes will incorporate a new altitude display system, the Innovative Solutions and Support (IS&S) Duplex Reduced Vertical Separation Minimum (RVSM) system, which was not available at the time of certification of these airplanes, that performs critical functions. This system may be vulnerable to high-intensity radiated fields (HIRF) external to the airplane.
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 Douglas Models DC-8-61, -61F, -63, -63F, -71, -71F, -72, -72F, -73, and -73F airplanes, modified by ABX Air, Inc. These special conditions require that new electrical and electronic systems, such as the ADDU, 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.
With the trend toward increased power levels from ground-based transmitters, and the advent of space and satellite communications, coupled with electronic command and control of the airplane, the immunity of critical digital avionic/electronics and electrical systems to HIRF must be established.
As discussed above, these special conditions are applicable Douglas Models DC-8-61, -61F, -63, -63F, -71, -71F, -72, -72F, -73, and -73F airplanes modified by ABX Air Inc. Should ABX Air Inc. apply at a later date for a supplemental type certificate to modify any other model included on Type Certificate No. 4A25 to incorporate the same or similar novel or unusual design feature, these special conditions would apply to that model as well under the provisions of § 21.101.
This action affects only certain novel or unusual design features on Douglas Models DC-8-61, -61F, -63, -63F, -71, -71F, -72, -72F, -73, and -73F airplanes modified by ABX Air 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 these airplanes.
End Authority Start Printed Page 54802
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 Douglas Models DC-8-61, -61F, -63, -63F, -71, -71F, -72, -72F, -73, and -73F airplanes modified by ABX Air Inc.
Issued in Renton, Washington, on September 10, 2003.
[FR Doc. 03-23970 Filed 9-18-03; 8:45 am]