[Federal Register Volume 60, Number 97 (Friday, May 19, 1995)]
[Rules and Regulations]
[Pages 26823-26824]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-12386]



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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 29

[Docket No. 94-ASW-3; Special Condition 29-ASW-15]


Special Condition: Bell Helicopter Textron Model 222U Helicopter, 
Electronic Flight Instrument System

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final special condition.

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SUMMARY: This special condition is issued for the Bell Helicopter 
Textron, Inc., Model 222U helicopter modified by Heli-Dyne Systems, 
Inc. This helicopter will have a novel or unusual design feature 
associated with the Electronic Flight Instrument System. This special 
condition contains additional safety standards that the Administrator 
considers necessary to establish a level of safety equivalent to that 
established by the airworthiness standards.

EFFECTIVE DATE: May 19, 1995.

FOR FURTHER INFORMATION CONTACT:
Mr. Robert McCallister, FAA, Rotorcraft Directorate, Policy and 
Procedures Group, Forth Worth, Texas 76193-0110; telephone (817) 222-
5121.

SUPPLEMENTARY INFORMATION:

Background

    On May 16, 1994, Heli-Dyne Systems, Inc., Hurst, Texas, applied for 
a Supplemental Type Certificate for installation of an Electronic 
Flight Instrument System in the Bell Helicopter Textron (BHTI) Model 
222U helicopter. This model helicopter is a 10 passenger, 2 engine, 
8,250 pound (Category B) or 7,850 pound (Category A) transport category 
helicopter.

Type Certification Basis

    The certification basis established for the BHTI Model 222U 
helicopter includes: 14 CFR 21.29 and part 29 of the Federal Aviation 
Regulations (FAR) effective February 1, 1965 (Transport Categories A 
and B), Amendments 29-1 through 29-9; Amendment 29-11; Sec. 29.997 of 
Amendment 29-10; Sec. 29.927(b)(2) of Amendment 29-17; Secs. 29.801, 
29.25(c) 29.865, 29.1557(c), and 29.1555(c) of Amendment 29.12; 
Secs. 29.1, 29.79, 29.1517, and 29.1587 of Amendment 29-21; Criteria 
for Helicopter Instrument Flight Rule (IFR) certification dated 
December 15, 1978; Exemption No. 2789, Sec. 29.811(h)(1) (following 
Amendment 24, effective December 6, 1984, Sec. 29.811(h)(1) became 
Sec. 29.811(f)(1)); and Exemption No. 4395, Sec. 29.855 (a) and 
portions of Sec. 29.855(d).
    If the Administrator finds that the applicable airworthiness 
regulations do not contain adequate or appropriate safety standards for 
these helicopters because of a novel or unusual design feature, special 
conditions are prescribed under the provisions of Sec. 21.16 to 
establish a level of safety equivalent that established in the 
regulations.
    Special conditions, as appropriate, are issued in accordance with 
Sec. 11.49 of the FAR after public notice, as required by Secs. 11.28 
and 11.29(b), and become part of the type certification basis in 
accordance with Sec. 21.101(b)(2). [[Page 26824]] 

Novel or Unusual Design Feature

    The BHTI Model 222U helicopter, at the time of the application for 
modification by Heli-Dyne Systems, Inc., was identified as 
incorporating one and possibly more electrical, electronic, or 
combination of electrical and electronic (electrical/electronic) 
systems that will perform functions critical to the continued safe 
flight and landing of the helicopter. The electronic flight instrument 
system performs the attitude display function. The display of attitude, 
altitude, and airspeed is critical to the continued safe flight and 
landing of the helicopters for IFR operations in Instrument 
Meteorological Conditions.
    If it is determined that these helicopters will incorporate other 
electrical/electronic systems performing critical functions, those 
systems also will be required to comply with the requirements of this 
special condition.

Discussion of Comments

    Notice of Proposed Special Condition No. SC-94-3-SW was published 
in the Federal Register on December 27, 1994 (59 FR 66489). No comments 
were received. Therefore, the special condition is adopted as proposed.

Conclusion

    This action affects only certain unusual or novel design features 
on one model of helicopter. 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 affected helicopter.

List of Subjects in 14 CFR Part 29

    Aircraft, Air transportation, Aviation safety, Rotorcraft, Safety.

    The authority citation for this special condition is as follows:

    Authority: 49 U.S.C. 1344, 1348(c), 1352, 1354(a), 1355, 1421 
through 1431, 1502, 1651(b)(2); 42 U.S.C. 1857f-10, 4321 et seq.; 
E.O. 11514; 49 U.S.C. 106(g).

The Special Condition

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the following special condition is issued as part of the 
type certification basis for the Bell Helicopter Textron Model 222U 
helicopter:

Protection for Electrical and Electronic Systems From High Intensity 
Radiated Fields

    Each system that performs critical functions must be designed and 
installed to ensure that the operation and operational capabilities of 
these critical functions are not adversely affected when the 
helicopters are exposed to high intensity radiated fields external to 
the helicopters.

    Issued in Fort Worth, Texas, on May 10, 1995.
Eric Bries,
Acting Manager, Rotorcraft Directorate, Aircraft Certification Service, 
ASW-100.
[FR Doc. 95-12386 Filed 5-18-95; 8:45 am]
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