[Federal Register Volume 61, Number 166 (Monday, August 26, 1996)]
[Rules and Regulations]
[Pages 43647-43648]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-21714]



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 Rules and Regulations
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  Federal Register / Vol. 61, No. 166 / Monday, August 26, 1996 / Rules 
and Regulations  

[[Page 43647]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 29

[Docket No. 96-ASW-2; Special Condition 29-ASW-16]


Special Condition: Sikorsky Model S76C, High Intensity Radiated 
Fields

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final special condition.

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SUMMARY: This special condition is issued for the Sikorsky Model S76C 
helicopter. This helicopter will have a novel or unusual design feature 
associated with the installation of electronic systems that perform 
critical functions. 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: August 26, 1996.

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

SUPPLEMENTARY INFORMATION: 

Background

    Sikorsky Aircraft Corporation, Stratford, Connecticut, applied for 
an amendment to the Type Certificate for the Model S76C helicopter on 
August 15, 1990. The amendment will allow installation of turbomeca 
Arriel Model 2S1 engines with FADEC control and 30 second/2 minute 
ratings as alternate engines for the Sikorsky Model S76C helicopter. 
This is a 12 (14 including crew) passenger, twin engine, 11,700 pound 
transport category helicopter.

Type Certification Basis

    The type certification basis is 14 Code of Federal Regulations part 
29, February 1, 1965, and Amendments 29-1 through 29-11; in addition, 
portions of Amendment 29-12, specifically, Secs. 29.67, 29.71, 29.75, 
29.141, 29.173, 29.175, 29.931, 29.1189(a)(2), 29.1555(c)(2), 
29.1557(c); Amendment 29-13, specifically Sec. 29.965; Amendment 29-24, 
specifically Sec. 1325; Amendment 29-30, specifically Sec. 29.811; 
Amendment 29-34, specifically Secs. 29.67(a)(1)(i), 29.923(a), (b)(1) & 
(3), 29.1143(f), 29.1305(a) (24) & (25), 29.1521(i) & (j) and 
29.1549(e); and Amendment 36-14 of 14 CFR part 36, Appendix H.
    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 to that established in the 
regulations.
    Special conditions, as appropriate, are issued in accordance with 
Sec. 11.49 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).
    Special conditions are initially applicable to the model for which 
they are issued. Should the type certificate for that model be amended 
later to include any other model that incorporates the same novel or 
unusual design feature or should any other model already included on 
the same type certificate be modified to incorporate the same novel or 
unusual design feature, the special conditions would also apply to the 
other model under the provisions of Sec. 21.101(a)(1).

Novel or Unusual Design Feature

    The Sikorsky Model S76C helicopter, at the time of the application 
for amendment to U.S. Type Certificate H1NE, 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. A Full Authority Digital Engine 
Control (FADEC) is an example of an electronic device that performs the 
critical functions of engine control. The control of the engines is 
critical to the continued safe flight and landing of the helicopter 
during visual flight rules (VFR) and instrument flight rules (IFR) 
operations.
    If it is determined that this helicopter currently or at a future 
date incorporates 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-96-2-SW was published 
in the Federal Register on May 8, 1996, 61 FR 20760. 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 manufacturer 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: 42 U.S.C. 7572; 49 U.S.C. 106(g), 40105, 40113, 
44701, 44702, 44704, 44707, 44709, 44711, 44713, 44715, 45303.

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 Sikorsky Model S76C 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.


[[Page 43648]]


    Issued in Fort Worth, Texas, on August 13, 1996.
Michele M. Owsley,
Acting Manager, Rotorcraft Directorate, Aircraft Certification Service.
[FR Doc. 96-21714 Filed 8-23-96; 8:45 am]
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