Source: https://www.federalregister.gov/documents/2011/07/07/2011-16814/special-conditions-pratt-and-whitney-canada-model-pt6c-67e-turboshaft-engine
Timestamp: 2017-09-20 08:12:44
Document Index: 132139341

Matched Legal Cases: ['ART 1', 'ART 33', 'art 33', 'art 33', 'art 33', 'art 33', '§\u200921', '§\u200921', 'art 33', '§\u200933', '§\u200933']

Federal Register :: Special Conditions: Pratt and Whitney Canada Model PT6C-67E Turboshaft Engine
A Proposed Rule by the Federal Aviation Administration on 07/07/2011
We must receive your comments by August 8, 2011.
76 FR 39795
Notice No. 33-11-02-SC
2011-16814
1. PART 1—DEFINITIONS
2. PART 33—REQUIREMENTS
https://www.federalregister.gov/d/2011-16814 https://www.federalregister.gov/d/2011-16814
Start Preamble Start Printed Page 39795
This action proposes special conditions for Pratt and Whitney Canada (PWC) model PT6C-67E engines. The engine model will have a novel or unusual design feature which is a 30-Minute All Engines Operating (AEO) power rating. This rating is primarily intended for high power hovering operations during search and rescue missions. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These proposed special conditions contain the added safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.
You may mail two copies of your comments to: Federal Aviation Administration, Engine and Propeller Directorate, Attn: Marc Bouthillier, Rules Docket (ANE111), Docket No. NE133, 12 New England Executive Park, Burlington, Massachusetts 01803-5299. You may deliver two copies to the Engine and Propeller Directorate at the above address. You may send comments via e-mail to marc.bouthillier@faa.gov. You must mark your comments: Docket No. NE133. You can inspect comments in the Rules Docket weekdays, except Federal holidays, between 7:30 a.m. and 4 p.m.
For technical questions concerning this proposed rule, contact Marc Bouthillier, ANE-111, Engine and Propeller Directorate, Aircraft Certification Service, 12 New England Executive Park, Burlington, Massachusetts 01803-5299; telephone (781) 238-7120; facsimile (781) 238-7199; e-mail marc.bouthillier@faa.gov. For legal questions concerning this proposed rule, contact Vincent Bennett, ANE-7, Engine and Propeller Directorate, Aircraft Certification Service, 12 New England Executive Park, Burlington, Massachusetts 01803-5299; telephone (781) 238-7044; facsimile (781) 238-7055; e-mail vincent.bennett@faa.gov.
We will file in the docket all comments we receive, as well as a report summarizing each substantive public contact with FAA personnel about these special conditions. You can inspect the docket before and after the comment closing date. If you wish to review the docket in person, go to the address in the ADDRESSES section of this preamble between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.
The endurance test requirement of 25 hours operation at 30 minutes AEO is similar to several special conditions issued over the past 20 years. Because the PT6C-67E model has a Continuous One-Engine-Inoperative (OEI) rating and limits equal to or higher than the 30-minute AEO rating, the test time performed at the Continuous OEI rating may be credited toward the 25-hour requirement. However, test time spent at other rating elements of the test, such as takeoff or other OEI ratings (that may be equal to or higher values), may not be counted toward the 25 hours of required running.
These special conditions contain the additional airworthiness standards necessary to establish a level of safety equivalent to the level that would result Start Printed Page 39796from compliance with the applicable standards of airworthiness in effect on the date of application.
Under the provisions of 14 CFR 21.17 and 21.101(a), PWC must show that the model PT6C-67E turboshaft engine meets the provisions of the applicable regulations in effect on the date of application, unless otherwise specified by the FAA. The current certification basis for this model series is 14 CFR part 33 Amendment 20; however, PWC proposes to demonstrate compliance to later amendments of part 33 for this model. In accordance with 14 CFR 21.101(b), the FAA concurs with the PWC proposal. Therefore, the certification basis for the PT6C-67E model turboshaft engine will be part 33, effective February 1, 1965, as amended by Amendments 33-1 through 33-30.
If the Administrator finds that the applicable airworthiness regulations in part 33, as amended, do not contain adequate or appropriate safety standards for the PWC model PT6C-67E turboshaft engine, because of a novel or unusual design feature, special conditions are prescribed under the provisions of § 21.16.
The FAA issues special conditions, as defined by 14 CFR 11.19, in accordance with 14 CFR 11.38, which become part of the type certification basis in accordance with § 21.17(b)(2).
The PWC model PT6C-67E turboshaft engine will incorporate a novel or unusual design feature which is a 30-Minute All Engine Operating (AEO) power rating, for use up to 30 minutes at any time between take-off and landing. Special conditions for a 30-Minute AEO rating are proposed to address this novel and unusual design feature. The special conditions are discussed below.
The PWC model PT6C-67E turboshaft engine is a free turbine turboshaft designed for a transport category twin-engine helicopter. The helicopter manufacturer anticipates that for search and rescue extended hovering maneuvers may require more than maximum continuous power for up to 30 minutes. PWC has requested a 30-Minute All Engine Operating (AEO) rating for use up to 30 minutes at any time between the take-off and landing phases of a flight. PWC has indicated that the number of times this rating can be accessed in one flight is not limited; but total time is limited to a cumulative total of 50 minutes for any one flight.
As discussed above, these special conditions are applicable to PWC model PT6C-67E turboshaft engines. If Pratt and Whitney Canada applies later for a change to the type certificate to include another closely related model incorporating the same novel or unusual design feature, these special conditions would apply to that model as well.
This action affects only certain novel or unusual design features on the Pratt and Whitney Canada Model PT6C-67E Turboshaft Engine. It is not a rule of general applicability, and it affects only Pratt and Whitney Canada who applied to the FAA for approval of these features on the engine.
Accordingly, the FAA proposes the following special conditions as part of the type certification basis for PWC model PT6C-67E turboshaft engines.
Unless otherwise approved by the Administrator and documented in the appropriate manuals and certification documents, the following definition applies to this special condition: “Rated 30 Minute AEO Power” means the approved shaft horsepower developed under static conditions at the specified altitude and temperature, and within the operating limitations established under part 33, and limited in use to periods not exceeding 30 minutes, and limited to a cumulative total of 50 minutes use for any given flight.
(1) Include instructions to ensure that in-service engine deterioration due to rated 30 minute AEO power usage will not be excessive, meaning that all other approved ratings, including One Engine Inoperative (OEI), are available (within associated limits and assumed usage) for each flight; and that deterioration will not exceed that assumed for declaring a Time Between Overhaul period.
(i) The applicant must validate the adequacy of the maintenance actions required under paragraph (b)(1) above.
(c) Section 33.87, Endurance Test. In addition to the requirements of §§ 33.87(a) and 33.87(d), the overall test run must include a minimum of 25 hours of operation at 30 minute AEO power and limits, divided into periods of 30 minutes AEO power with alternate periods at maximum continuous power or less.
(1) Each § 33.87(d) continuous OEI rating test period of 30 minutes or longer, run at power and limits equal to or higher than the 30 minute AEO rating, may be credited toward this requirement.
Issued in Burlington, Massachusetts, on June 23, 2011.
[FR Doc. 2011-16814 Filed 7-6-11; 8:45 am]