Source: https://www.federalregister.gov/documents/2002/06/07/02-14351/special-conditions-liberty-aerospace-model-xl-2-airplane-installation-of-full-authority-digital
Timestamp: 2018-04-19 12:11:10
Document Index: 476808614

Matched Legal Cases: ['art 23', 'art 23', '§\u200921', 'art 34', 'art 36', '§\u200923', '§\u200921']

Federal Register :: Special Conditions: Liberty Aerospace, Model XL-2 Airplane, Installation of Full Authority Digital Engine Control (FADEC) System and the Protection of the System From the Effects of High Intensity Radiated Fields (HIRF)
Special Conditions: Liberty Aerospace, Model XL-2 Airplane, Installation of Full Authority Digital Engine Control (FADEC) System and the Protection of the System From the Effects of High Intensity Radiated Fields (HIRF)
67 FR 39264
39264-39265 (2 pages)
Docket No. CE174
Special Conditions No. 23-119-SC
02-14351
https://www.federalregister.gov/d/02-14351 https://www.federalregister.gov/d/02-14351
These special conditions are issued for the Liberty Aerospace Model XL-2 airplane. This airplane will have a novel or unusual design feature(s) associated with the installation of an engine that uses an electronic engine control system in place of the engine's mechanical system. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. 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.
On October 26, 2000, Liberty Aerospace applied for a type certificate for their new Model XL-2. The Model XL-2 is powered by one reciprocating engine equipped with an electronic engine control system with full authority capability in place of the hydromechanical control system.
Under the provisions of 14 CFR 21.17, Liberty Aerospace must show that the Model XL-2 meets the applicable provisions of 14 CFR part 23, as amended by Amendments 23-1 through 23-53 thereto.
If the Administrator finds that the applicable airworthiness regulations (i.e., 14 CFR part 23) do not contain adequate or appropriate safety standards for the Model XL-2 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 Model XL-2 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, and the FAA must issue a finding of regulatory adequacy pursuant to section 611 of Public Law 92-574, the “Noise Control Act of 1972.”
The Model XL-2 will incorporate the following novel or unusual design features:
Liberty Aerospace, Model XL-2 airplane will use an engine that includes an electronic control system with full engine authority capability.
Many advanced electronic systems are prone to either upsets or damage, or both, at energy levels lower than analog systems. The increasing use of high power radio frequency emitters mandates requirements for improved high intensity radiated fields (HIRF) protection for electrical and electronic equipment. Since the electronic engine control system used on the Liberty Aerospace, Model XL-2 will perform critical functions, provisions for protection from the effects of HIRF fields should be considered and, if necessary, incorporated into the airplane design data. The FAA policy contained in Notice 8110.71, dated April 2, 1998, establishes the HIRF energy levels that airplanes will be exposed to in service. The guidelines set forth in this Notice are the result of an Aircraft Certification Service review of existing policy on HIRF, in light of the ongoing work of the ARAC Electromagnetic Effects Harmonization Working Group (EEHWG). The EEHWG adopted a set of HIRF environment levels in November 1997 that were agreed upon by the FAA, JAA, and industry participants. As a result, the HIRF environments in this notice reflect the environment levels recommended by this working group. This notice states that a full authority digital engine control is an example of a system that should address the HIRF environments.
Therefore, special conditions are proposed for the Liberty Aerospace, Model XL-2 to provide HIRF protection and to evaluate the installation of the electronic engine control system for Start Printed Page 39265compliance with the requirements of § 23.1309(a) through (e) at Amendment 23-46.
Notice of proposed special conditions No. 23-02-01-SC for the Liberty Aerospace Model XL-2 airplanes was published on March 14, 2002 (67 FR 11451). No comments were received, and the special conditions are adopted as proposed.
As discussed above, these special conditions are applicable to the Model XL-2. Should Liberty Aerospace apply at a later date for a change to the type certificate to include another model incorporating the same novel or unusual design feature, the 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 one model XL-2 of airplanes. It is not a rule of general applicability, and it 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 type certification basis for Liberty Aerospace Model XL-2 airplanes.
Issued in Kansas City, Missouri on May 29, 2002.
[FR Doc. 02-14351 Filed 6-6-02; 8:45 am]