[Federal Register Volume 82, Number 122 (Tuesday, June 27, 2017)]
[Rules and Regulations]
[Page 28994]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2017-12939]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 33
[Docket No. FAA-2014-0376; Notice No. 33-014-01-SC]
Special Conditions: SNECMA, Silvercrest-2 SC-2D; Rated 10-Minute
One Engine Inoperative Takeoff Thrust at High Ambient Temperature;
Withdrawal
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final special conditions, withdrawal.
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SUMMARY: The FAA is withdrawing previously published special conditions
for the Silvercrest-2 SC-2D engine model. We are requesting the
withdrawal because the ``Rated 10-Minute One Engine Inoperative Takeoff
Thrust at High Ambient Temperature (Rated 10-Minute OEI TOTHAT) is not
needed.
DATES: As of June 27, 2017, the special conditions published on October
31, 2014 at 79 FR 64666, are withdrawn.
FOR FURTHER INFORMATION CONTACT: Tara Fitzgerald, ANE-112, Engine and
Propeller Directorate, Aircraft Certification Service, 1200 District
Avenue, Burlington, Massachusetts, 01803-5213; telephone (781) 238-
7130; facsimile (781) 238-7199; email [email protected].
SUPPLEMENTARY INFORMATION:
Background
On April 19, 2011, SNECMA, now known as Safran Aircraft Engines
(SAE) applied for a new type certificate for the Silvercrest-2 SC-2D
engine model. At that time, the Silvercrest-2 SC-2D engine model was to
have a novel or unusual design feature when compared to the state of
technology described in the airworthiness standards for aircraft
engines. The design feature included an additional takeoff rating for
the Silvercrest-2 SC-2D engine model, named ``Rated 10-Minute One
Engine Inoperative Takeoff Thrust at High Ambient Temperature'' (Rated
10-Minute OEI TOTHAT). It was intended to maintain the takeoff thrust
in certain high ambient temperature conditions for a maximum of 10
minutes with one engine inoperative (OEI).
Reason for Withdrawal
The FAA is withdrawing Notice No. 33-014-01-SC because of concerns
raised over the sufficiency of the ``Rated 10-Minute OEI TOTHAT''
special condition to meet the Automatic Takeoff Thrust Control System
(ATTCS) design requirement specified in Title 14, Code of Federal
Regulations (14 CFR) part 25, section I25.5(b)(2).
The proposed takeoff rating was for use during OEI events that
occur during takeoff in high ambient temperature conditions, up to 5
degrees Celsius hotter than the rated takeoff corner point. The
assumptions for this rating are no longer valid and the ``Rated 10-
Minute OEI TOTHAT'' is not needed.
Conclusion
This withdrawal does not preclude the FAA from issuing another
notice on the subject matter in the future or committing the agency to
any future course of action.
Issued in Burlington, Massachusetts, on June 13, 2017.
Carlos A. Pestana,
Acting Assistant Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 2017-12939 Filed 6-26-17; 8:45 am]
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