[Federal Register Volume 63, Number 116 (Wednesday, June 17, 1998)]
[Rules and Regulations]
[Pages 32972-32973]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-16078]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Parts 21 and 29
[Docket No. SW004; Special Conditions No. 29-004-SC]
Special Conditions: Sikorsky Aircraft Corporation, Model S76C;
Application of Rated 30-Minute Power
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final special conditions; request for comments.
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SUMMARY: These special conditions are issued for the Sikorsky Model
S76C helicopter. This helicopter will have a novel or unusual design
feature associated with a new rated 30-minute power. The applicable
airworthiness regulations do not contain adequate or appropriate safety
standards for this new rated 30-minute power. 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.
DATES: The effective date of these special conditions is June 17, 1998.
Comments must be received on or before July 17, 1998.
ADDRESSES: Comments on these special conditions may be mailed in
duplicate to: Federal Aviation Administration (FAA), Office of the
Regional Counsel, Attention: Rules Docket No. SW004, 2601 Meacham
Blvd., Room 663, Fort Worth, Texas 76137; or delivered in duplicate to
the Office of the Regional Counsel at the above address. Comments must
be marked Docket No. SW004. Comments may be inspected in the Rules
Docket weekdays, except Federal holidays, between 7:30 a.m. and 4:00
p.m.
FOR FURTHER INFORMATION CONTACT: Scott Horn, FAA, Rotorcraft
Directorate, Rotorcraft Standards Staff, Fort Worth, Texas 76193-0110,
telephone (817) 222-5125, fax (817) 222-5961.
SUPPLEMENTARY INFORMATION: 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
design and thus delivery of the affected helicopter. The FAA therefore
finds that good cause exists for making these special conditions
effective upon issuance.
Comments Invited
Interested persons are invited to submit such written data, views,
or arguments as they may desire. Communications should identify the
regulatory docket and be submitted in duplicate to the address
specified above. All communications received on or before the closing
date for comments will be considered. 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 special condition must include a self-addressed,
stamped postcard on which the following statement is made: ``Comments
to Docket No. SW004.'' The postcard will be date stamped and returned
to the commenter.
Background
On November 19, 1997, Sikorsky Aircraft Corporation applied for a
change to Type Certificate (TC) No. H1NE for use of a rated 30-minute
power on the Model S76C helicopter. The Sikorsky Model S76C is a
transport category A and B rotorcraft powered by two Turbomeca Arriel
2S1 engines with a maximum gross weight of 11,700 pounds.
This new rated 30-minute power is intended for periods of use up to
30 minutes at any time after takeoff during a flight performing search
and rescue missions. However, this rating is also suitable for other
missions that require increased rotorcraft hovering capability and
duration than the current ratings allow. The Sikorsky Model S76C
helicopter with the Arriel 2S1 engine installation will have the
following power ratings: 30-second One-Engine-Inoperative (OEI), 2-
minute OEI, Continuous OEI, 30-minute, Takeoff, and Maximum Continuous
ratings.
The current rotorcraft maximum continuous rating is at the same
torque and RPM limits as the proposed 30-minute rating. As a result,
the FAA has determined that compliance with the structural and drive
system requirements of 14 CFR part 29 (part 29) has not been affected
by this new rating application. In addition, all the power parameter
limits and ranges for the 30-minute power coincide with the existing
instrument markings for the takeoff rating. Therefore, these markings,
applied to the new 30-minute power, have been found to comply with the
part 29 requirements.
The applicable airworthiness requirements do not contain a 30-
minute power rating definition and do not contain adequate or
appropriate safety standards for the type certification of this new and
unusual engine rating. Due to increased N1 (gas turbine
speed) and T5 (turbine outlet temperature) limits for this
new rating, as compared to the existing continuous rating,
airworthiness requirements must be developed for powerplant cooling and
operational limitations. Additionally, for use of the 30-minute power
rating, the engine manufacturer has established a new method to
determine the engine overhaul time. The new method accelerates the
engine hours time-in-service when the 30-minute rating is used. For the
Sikorsky Model S76C helicopter, the pilot is required to record the 30-
minute rating usage, since no means of automatically counting or
recording is provided. As a result of the additional workload to the
pilot, the FAA has determined that a two-pilot crew is necessary to
meet the minimum flight crew requirements of part 29.
Type Certification Basis
Under the provisions of 14 CFR 21.101, Sikorsky Aircraft
Corporation must show that the Model S76C helicopter with the Arriel
2S1 engine installation meets the applicable provisions of the
regulations in effect on the date of the application or the applicable
provisions of the regulations as referenced in TC Number H1NE. The
regulations incorporated by reference in the TC are commonly referred
to as the ``original type certification basis.'' The regulations
incorporated by reference in TC Number H1NE are as follows:
Part 29, effective February 1, 1965, plus Amendments 29-1 through
29-11;
[[Page 32973]]
in addition, portions of Amendments 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), and portions of Amendment 29-13,
specifically Sec. 29.965, and Amendment 29-21. In addition, for the
Sikorsky Model S76C (with Arriel 2S1 Engine Configuration): Amendment
29-34 specifically 29.67(a)(1)(i), 29.923(a), (b)(1) and (b)(3),
29.1143(f), 29.1305(a)(24) and (a)(25), 29.1521(i) and (j), and
29.1549(e) and Amendment 36-20 of FAR 36, Appendix H; also Special
Condition No. 96-ASW-16. In addition, the certification basis includes
certain special conditions, exemptions and later amended sections of
the applicable Part that are not relevant to these special conditions.
If the Administrator finds that the applicable airworthiness
regulations for part 29 do not contain adequate or appropriate safety
standards for the Sikorsky Model S76C because of a novel or unusual
design feature, special conditions are prescribed under the provisions
of Sec. 21.16.
In addition to the applicable airworthiness regulations and special
conditions, the Sikorsky Model S76C must comply with the noise
certification requirements of part 36, and the FAA must issue a finding
of regulatory adequacy pursuant to Sec. 611 of Public Law 92-574, the
``Noise Control Act of 1972.''
Special conditions, as appropriate, are issued in accordance with
Sec. 11.49, 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 TC 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
TC 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 Features
The Sikorsky Model S76C will incorporate the following novel or
unusual design features: A new rated 30-minute power which will require
a special condition for hovering cooling test procedures and powerplant
limitations.
Applicability
As discussed above, these special conditions are applicable to the
Sikorsky Model S76C. Should Sikorsky Aircraft Corporation apply at a
later date for a change to the TC 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
Sec. 21.101(a)(1).
Conclusion
This action affects only certain novel or unusual 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 helicopter.
Under standard practice, the effective date of final special
conditions would be 30 days after the date of publication in the
Federal Register; however, as the certification date for the Sikorsky
Model S76C is imminent, the FAA finds that good cause exists to make
these special conditions effective upon issuance. The FAA is requesting
comments to allow interested persons to submit views that may not have
been submitted in response to the prior opportunities for comment
described above.
List of Subjects in 14 CFR Parts 21 and 29
Aircraft, Air transportation, Aviation safety, Rotorcraft, Safety.
The authority citation for these special conditions is as follows:
Authority: 42 U.S.C. 7572; 49 U.S.C. 106(g), 40105, 40113,
44701-44702, 44704, 44709, 44711, 44713, 44715, 45303.
The Special Conditions
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 Sikorsky Model S76C helicopters.
1. Section 29.1049 Hovering Cooling Test Procedures
In addition to the requirements of Sec. 29.1049, acceptable
hovering cooling provisions must be shown for the following conditions:
(a) At the maximum weight, or at the greatest weight at which the
rotorcraft can hover (if less), at sea level, with the power required
to hover but not more than 30-minute power, in-ground effect in still
air, until at least 5 minutes after the occurrence of the highest
temperature recorded or until the expiration of the 30-minute power
application period, whichever occurs first; and,
(b) With 30-minute power, maximum weight, and at the altitude
resulting in zero rate of climb for this configuration, until at least
5 minutes after the occurrence of the highest temperature recorded or
until the expiration of the 30-minute power application period,
whichever occurs first.
2. Section 29.1521 Powerplant limitations
In addition to the requirements of Sec. 29.1521 the limitations for
rated 30-minute power usage must be established as follows:
Rated 30-Minute Power Operations
The powerplant rated 30-minute power operation must be limited to
use for periods not to exceed 30 minutes for hovering operations only
and by:
(a) The maximum rotational speed which may not be greater than--
(i) The maximum value determined by the rotor design; or
(ii) The maximum value shown during the type tests;
(b) The maximum allowable turbine outlet gas temperature;
(c) The maximum allowable engine and transmission oil temperatures.
(d) The maximum allowable power or torque for each engine,
considering the power input limitations of the transmission with all
engines operating; and
(e) The maximum allowable power or torque for each engine
considering the power input limitations of the transmission with one-
engine-inoperative.
Issued in Fort Worth, Texas, on June 5, 1998.
Eric Bries,
Acting Manager, Rotorcraft Directorate, Aircraft Certification Service,
ASW-100.
[FR Doc. 98-16078 Filed 6-16-98; 8:45 am]
BILLING CODE 4910-13-P
