Source: https://www.federalregister.gov/documents/2005/06/30/05-12879/special-conditions-raytheon-model-king-air-h-90-t-44a-protection-of-systems-for-high-intensity
Timestamp: 2017-11-21 15:00:55
Document Index: 65059784

Matched Legal Cases: ['ART 23', 'art 21', '§\u200921', 'art 23', '§\u200921', '§\u200921']

Federal Register :: Special Conditions; Raytheon Model King Air H-90 (T-44A) Protection of Systems for High Intensity Radiated Fields (HIRF)
Special Conditions; Raytheon Model King Air H-90 (T-44A) Protection of Systems for High Intensity Radiated Fields (HIRF)
The effective date of these special conditions is June 22, 2005.
70 FR 37654
37654-37656 (3 pages)
Docket No. CE230, Special Condition 23-170-SC
05-12879
PART 23—[AMENDED]
https://www.federalregister.gov/d/05-12879 https://www.federalregister.gov/d/05-12879
These special conditions are issued to ARINC Inc., 1632 S. Murray Blvd., Colorado Springs, CO 80916 for a Supplemental Type Certificate for the Raytheon Model King Air H-90 (T-44A) airplane. These airplanes will have novel and unusual design features when compared to the state of technology envisaged in the applicable airworthiness standards. The novel and unusual design features include the installation of the Rockwell Collins Pro Line 21 Avionics System. This system includes Electronic Flight Instrument Systems (EFIS), electronic displays, digital Air Data Computers (ADC), and supporting equipment. The applicable regulations do not contain adequate or appropriate airworthiness 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 the airworthiness standards applicable to these airplanes.
Comments must be received on or before August 1, 2005.
Comments may be mailed in duplicate to: Federal Aviation Administration, Regional Counsel, ACE-7, Attention: Rules Docket Clerk, Docket No. CE230, Room 506, 901 Locust, Kansas City, Missouri 64106. All comments must be marked: Docket No. CE230. Comments may be inspected in the Rules Docket weekdays, except Federal holidays, between 7:30 a.m. and 4 p.m.
Wes Ryan, Aerospace Engineer, Standards Office (ACE-110), Small Airplane Directorate, Aircraft Certification Service, Federal Aviation Administration, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone (816) 329-4127. Start Printed Page 37655
The FAA has determined that notice and opportunity for prior public comment hereon are impracticable because these procedures would significantly delay issuance of the approval and thus delivery of the affected aircraft. In addition, the substance of these special conditions has been subject to the public comment process in several prior instances with no substantive comments received. The FAA, therefore, finds that good cause exists for making these special conditions effective upon issuance.
Interested persons are invited to submit such written data, views, or arguments, as they may desire. Communications should identify the regulatory docket or notice number and be submitted in duplicate to the address specified above. All communications received on or before the closing date for comments will be considered by the Administrator. The special conditions may be changed in light of the comments received. All comments received will be available in the Rules Docket for examination by interested persons, both before and after the closing date for comments. A report summarizing each substantive public contact with FAA personnel concerning this rulemaking will be filed in the docket. Commenters wishing the FAA to acknowledge receipt of their comments submitted in response to this notice must include a self-addressed, stamped postcard on which the following statement is made: “Comments to Docket No. CE230.” The postcard will be date stamped and returned to the commenter.
On June 7, 2005, ARINC Inc. 1632 S. Murray Blvd., Colorado Springs, CO 80916, notified the Denver ACO of a Designated Alteration Station (DAS) project for a new Supplemental Type Certificate for the Raytheon Model H90 (T-44A) airplanes. The Raytheon Models of concern are approved under TC No. 3A20. The proposed modification incorporates a novel or unusual design features, including a dual EFIS system, digital air data computers, and other equipment associated with the Rockwell Collins Pro Line 21 Avionics System. These systems may be vulnerable to HIRF external to the airplane.
Under the provisions of 14 CFR part 21, § 21.101, ARINC, Inc. must show that the Raytheon Model H90 (T-44A) airplanes meet the following provisions, or the applicable regulations in effect on the date of application for the STC: For those areas modified or impacted by the installation, ARINC will use 14 CFR part 23 Amendments 23-1 through 23-55. This includes applying the concepts of 23.1301, 23.1302, 23.1309, 23.1311, 23.1321, 23.1322, 23.1331, 23.1335, 23.1351, 23.1357, 23.1359, 23.1361, 23.1365, 23.1367, 23.1381, 23.1431, 23.1529, 23.1541, 23.1543, 23.1581 at amendment 55, and the special conditions adopted by this rulemaking action. For systems that are not modified or impacted by the installation, the original certification basis listed on TC No. 3A20 are still applicable.
Special conditions are initially applicable to the models for which they are issued. Should the applicant apply 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 feature, the special conditions would also apply to the other model under the provisions of § 21.101.
ARINC, Inc. plans to incorporate certain novel and unusual design features into an airplane for which the airworthiness standards do not contain adequate or appropriate safety standards for protection from the effects of HIRF. These features include the addition of a digital Air Data computer, which may be susceptible to the HIRF environment, that were not envisaged by the existing regulations for this type of airplane.
Start Printed Page 37656
A preliminary hazard analysis must be performed by the applicant, for approval by the FAA, to identify either electrical or electronic systems that perform critical functions. The term “critical” means those functions, whose failure would contribute to, or cause, a failure condition that would prevent the continued safe flight and landing of the airplane. The systems identified by the hazard analysis that perform critical functions are candidates for the application of HIRF requirements. A system may perform both critical and non-critical functions. Primary electronic flight display systems, and their associated components, perform critical functions such as attitude, altitude, and airspeed indication. The HIRF requirements apply only to critical functions.
As discussed above, these special conditions are applicable to Raytheon Model H90 (T-44A) airplanes. Should ARINC, Inc. apply at a later date for a supplemental type certificate to modify any other model on the same type certificate to incorporate the same novel or unusual design feature, the special conditions would apply to that model as well under the provisions of § 21.101.
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 the Raytheon Model 90 (T-44A) airplanes modified by ARINC, Inc. to add the Rockwell Collins Pro Line 21 Avionics System.
2. For the purpose of these special conditions, the following definition applies: Critical Functions: Functions whose failure would contribute to, or cause, a failure condition that would prevent the continued safe flight and landing of the airplane.
Issued in Kansas City, Missouri, on June 22, 2005.
[FR Doc. 05-12879 Filed 6-29-05; 8:45 am]