Document ID: FAA-2015-1771-0001
Agency: faa
Document Type: Proposed Rule
Title: Special Conditions: Pratt and Whitney Canada, PW210A; Flat 30-second and 2-minute One Engine Inoperative Rating
Posted Date: 2015-05-28T04:00Z

[Federal Register Volume 80, Number 102 (Thursday, May 28, 2015)]
[Proposed Rules]
[Pages 30389-30391]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2015-12986]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 33

[Docket No. FAA-2015-1771; Notice No. 33-15-01-SC]

Special Conditions: Pratt and Whitney Canada, PW210A; Flat 30-
Second and 2-Minute One Engine Inoperative Rating

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed special conditions.

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SUMMARY: This action proposes special conditions for the Pratt and 
Whitney Canada PW210A engine model. This engine will have a novel or 
unusual design feature--an additional one engine inoperative (OEI) 
rating that combines the 30-second and 2-minute OEI ratings into a 
single rating. The applicable airworthiness regulations do not contain 
adequate or appropriate safety standards for this design feature. These 
proposed 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: Send your comments on or before June 8, 2015.

ADDRESSES: Send comments identified by docket number FAA-2015-1771 
using any of the following methods:
     Federal eRegulations Portal: Go to http://www.regulations.gov and follow the online instructions for sending your 
comments electronically.
     Mail: Send comments to Docket Operations, M-30, U.S. 
Department of Transportation (DOT), 1200 New Jersey Avenue SE., Room 
W12-140, West Building Ground Floor, Washington, DC 20590-0001.
     Hand Delivery or Courier: Take comments to Docket 
Operations in Room W12-140 of the West Building Ground Floor at 1200 
New Jersey Avenue SE., Washington, DC, between 8 a.m., and 5 p.m., 
Monday through Friday, except Federal holidays.
     Fax: Fax comments to Docket Operations at 202-493-2251.
    Privacy: The FAA will post all comments it receives, without 
change, to http://regulations.gov, including any personal information 
the commenter provides. Using the search function of the docket Web 
site, anyone can find and read the electronic form of all comments 
received into any FAA docket, including the name of the individual 
sending the comment (or signing the comment for an association, 
business, labor union, etc.). DOT's complete Privacy Act Statement can 
be found in the Federal Register published on April 11, 2000 (65 FR 
19477-19478), as well as at http://DocketsInfo.dot.gov.
    Docket: Background documents or comments received may be read at 
http://www.regulations.gov at any time. Follow the online instructions 
for accessing the docket or go to the Docket Operations in Room W12-140 
of the West Building Ground Floor at 1200 New Jersey Avenue SE., 
Washington, DC, between 9 a.m., and 5 p.m., Monday through Friday, 
except Federal holidays.

FOR FURTHER INFORMATION CONTACT: For technical questions concerning 
this proposed rule, contact Tara Fitzgerald, ANE-111, Engine and 
Propeller Directorate, Aircraft Certification Service, 12 New England 
Executive Park, Burlington, Massachusetts 01803-5213; telephone (781) 
238-7130; facsimile (781) 238-7199. 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; email vincent.bennett@faa.gov.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    We invite interested people to take part in this rulemaking by 
sending written comments, data, or views. The most helpful comments 
reference a specific portion of the special conditions, explain the 
reason for any recommended change, and include supporting data.
    We will consider all comments received in the docket on or before 
the closing date for comments. We will consider comments filed late if 
it is possible to do so without incurring expense or delay. We may 
change these special conditions based on the comments we receive.

Background

    On February 14, 2013, Pratt and Whitney Canada applied for an 
amendment to Type Certificate No. E00083EN-E to include the new PW210A 
engine model. The PW210A, which is a derivative of the PW210S

[[Page 30390]]

currently approved under E00083EN-E, is intended for rotorcraft use. 
For their PW210A engine model, Pratt and Whitney Canada requests an 
additional OEI rating that combines the 30-second and 2-minute OEI 
rating into a single rating to satisfy the rotorcraft requirements for 
increased power in OEI scenarios. This additional OEI rating is named 
``Flat 30-second and 2-minute OEI.''
    These special conditions are necessary because the applicable 
airworthiness regulations do not contain adequate or appropriate safety 
standards for combining the requirements of the flat 30-second and 2-
minute OEI rating.

Type Certification Basis

    Under the provisions of Sec.  21.101, Pratt and Whitney Canada must 
show that the PW210A meets the applicable provisions of 14 CFR part 33, 
as amended by Amendments 33-1 through 33-30. These regulations will be 
incorporated into Type Certificate No. E00083EN after type 
certification approval of the PW210A. The regulations incorporated by 
reference in the type certificate are commonly referred to as the 
``original type certification basis.'' The regulations incorporated by 
reference in Type Certificate No. E00083NE are as follows:
    Title 14 of the Code of Federal Regulations (14 CFR part 33), 
effective February 1, 1965, Amendments 33-1 through 33-24 and two 
special conditions: 33-008-SC: For on ground engine operation in 
auxiliary power unit (APU) mode, and 33-009-SC: For 30-minutes all 
engines operating (AEO) hovering power engine rating.
    For the PW210A the certification basis is:
    1. Airworthiness Standards: 14 CFR part 33, effective February 1, 
1965, Amendments 33-1 through 33-30, inclusive.
    2. Environmental Standards: 14 CFR part 34, effective September 10, 
1990, as amended by 34-1 through 34-4 and 40 CFR part 87, effective 
(ICAO Annex 16, Volume II--Aircraft Engine Emissions, as amended up to 
and including Amendment 6).
    In addition, the certification basis includes other regulations, 
special conditions and exemptions that are not relevant to these 
proposed special conditions. Type Certificate No. E00083EN will be 
updated to include a complete description of the certification basis 
for this model engine.
    If the Administrator finds that the applicable airworthiness 
regulations (i.e., 14 CFR part 33) do not contain adequate or 
appropriate safety standards for the PW210A because of a novel or 
unusual design feature, special conditions are prescribed under the 
provisions of Sec.  21.16.
    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 or similar 
novel or unusual design feature, or should any other model already 
included on the same type certificate be modified to incorporate the 
same or similar novel or unusual design feature, the special conditions 
would also apply to the other model under Sec.  21.101.
    Accordingly, should type certificate E00083EN be amended to include 
another model that incorporates the ``Flat 30-second and 2-minute 
OEI,'' the special conditions as defined would apply to models whose 
certification basis is amendment 33-25 or later.
    The FAA issues special conditions, as defined in 14 CFR 11.19, in 
accordance with Sec.  11.38, and they become part of the type-
certification basis under Sec.  21.17(a)(2).

Novel or Unusual Design Features

    The PW210A will incorporate the following novel or unusual design 
features: The design feature is a ``Flat 30-second and 2-minute'' one 
engine inoperative (OEI) rating. The Flat 30-second and 2-minute OEI 
rating represents a case where the power levels and associated 
operating limitations for the 30-second OEI and 2-minute OEI ratings 
(defined in Part 33) are the same.

Discussion

    These proposed special conditions are necessary because current 
part 33 regulations do not contain airworthiness standards for 
extending the 2-minute OEI rating for 30-seconds. These special 
conditions extend the time dependent requirements applicable to the 30-
second OEI or 2-minute OEI to the 2.5 minutes time duration of the 
``Flat 30-second and 2-minute OEI'' Power.
    The 2.5 minutes time duration for the rating may affect the 
engine's structural and operational characteristics that are time 
dependent, such as the values for transients, time duration for 
stabilization to steady state, and part growth due to deformation. To 
address these aspects, we propose special conditions based on revised 
requirements of Sec. Sec.  33.27, 33.87(a)(7), and 33.88(b).
    The 2.5 minutes time duration for the rating affects the test 
conducted for the endurance test. For the 30-second OEI and 2-minute 
OEI the test schedule of Sec.  33.87(f) is divided among the two 
ratings. We propose special conditions based on revised requirements of 
Sec.  33.87(f) to ensure the test will be run for 2.5 minutes duration 
with no interruption.
    The 2.5 minutes time duration for the rating necessitates extending 
the time duration requirement of Sec.  33.28(k) applicable to the 30-
second OEI rating from 30 seconds to 2.5 minutes. This proposed 
requirement is for automatic availability and control of the engine for 
the entire duration of the rating's usage.
    The 2.5 minutes time duration for the rating necessitates extending 
the requirements of Sec.  33.29(c) that are applicable to 30-second OEI 
and 2-minute OEI ratings to the single Flat 30-second and 2-minute OEI 
Power rating. We propose special conditions to ensure that the 
instrumentation requirements normally reserved for 30-second OEI and 2-
minute OEI ratings are applied to the Flat 30-second and 2-minute OEI 
Power rating over its whole duration. The pilot does not have to be 
alerted at the end of 30 seconds use of the Flat 30-second and 2-minute 
OEI Power rating, only after the entire 2 minutes 30 seconds has 
expired.
    Paragraph 2.(e)(3) of these special conditions states that the 
engine must provide means or provision of means to alert maintenance of 
use of the Flat 30-second and 2-minute OEI Power rating, `alert' means 
after the aircraft lands, so any required maintenance actions can be 
completed before next flight.

Applicability

    As discussed above, these special conditions are applicable to the 
PW210A. Should Pratt and Whitney Canada apply at a later date for a 
change to the type certificate to include another model incorporating 
the same novel or unusual design feature, the special conditions would 
apply to that model as well.
    Certification of the PW210A is currently scheduled for May 1, 2015. 
The substance of these special conditions has been subject to the 
notice and public-comment procedure in a prior instance. Therefore, 
because a delay would significantly affect the applicant's both 
installation of the system and certification of the airplane, we are 
shortening the public-comment period to 10 days.

Conclusion

    This action affects only the Flat 30-second and 2-minute OEI design 
features on the PW210A engine model. It is not a rule of general 
applicability and applies only to Pratt and Whitney Canada, who 
requested FAA approval of this engine feature.

[[Page 30391]]

List of Subjects in 14 CFR Part 33

    Air Transportation, Aircraft, Aviation, Aviation safety, Safety.

    The authority citation for these special conditions is as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701, 44702, 44704.

The Proposed Special Conditions

    Accordingly, the Federal Aviation Administration (FAA) proposes the 
following special conditions as part of the type certification basis 
for Pratt and Whitney Canada PW210A engine model.

Flat 30-Second and 2-Minute OEI

1. Part 1.1 Definitions

    ``Rated Flat 30-second and 2-minute One Engine Inoperative (OEI) 
Power,'' with respect to rotorcraft turbine engines, means (1) a single 
rating for which the shaft horsepower and associated operating 
limitations of the 30-second OEI and 2-minute OEI ratings are equal, 
and (2) the shaft horsepower is that developed under static conditions 
at the altitude and temperature for the hot day, and within the 
operating limitations established under Part 33. The rating is for 
continuation of flight operation after the failure or shutdown of one 
engine in multiengine rotorcraft, for up to three periods of use no 
longer than 2.5 minutes each in any one flight, and followed by 
mandatory inspection and prescribed maintenance action.

2. Part 33 Requirements

    (a) The airworthiness standards in Part 33 Amendment 30 for the 30-
second OEI and 2-minute OEI ratings are applicable to the Flat 30-
second and 2-minute OEI Power rating. In addition the following special 
conditions apply;
    (b) Section 33.7 Engine ratings and operating limitations. Flat 30-
second and 2-minute OEI Power rating and operating limitations are 
established for power, torque, rotational speed, gas temperature, and 
time duration.
    (c) Section 33.27 Turbine, compressor, fan, and turbosupercharger 
rotor overspeed. The requirements of Sec.  33.27, except that following 
the test, the rotor may not exhibit conditions such as cracking or 
distortion which preclude continued safe operation.
    (d) Section 33.28 Engine controls systems. Must incorporate a 
means, or a provision for a means, for automatic availability and 
automatic control of the Flat 30-second and 2-minute OEI Power within 
the declared operating limitations.
    (e) Section 33.29 Instrument Connection. In lieu of the 
requirements of 33.29(c) the PW210A must incorporate a means or a 
provision for a means to:
    (1) Alert the pilot when the engine is at the Flat 30-second and 2-
minute OEI Power level, when the event begins, and when the time 
interval expires;
    (2) Automatically record each usage and duration of power at the 
Flat 30-second and 2-minute OEI Power rating;
    (3) Following each flight when the Flat 30-second and 2-minute OEI 
Power rating is used, alert maintenance personnel in a positive manner 
that the engine has been operated at the Flat 30-second and 2-minute 
OEI Power level, and permit retrieval of the recorded data; and
    (4) Enable routine verification of the proper operation of the 
above means.
    (f) Section 33.87 Endurance test. The requirements applicable to 
30-second and 2-minute OEI ratings, except for:
    (1) The test of Sec.  33.87(a)(7) for the purposes of temperature 
stabilization, must be run with a test period time of 2.5 minutes.
    (2) The tests in Sec.  33.87(f)(2) and (3) must be run continuously 
for the duration of 2.5 minutes, and
    (3) The tests in Sec.  33.87(f)(6) and (7) must be run continuously 
for the duration of 2.5 minutes.
    (g) Section 33.88 Engine overtemperature test. The requirements of 
Sec.  33.88(b) except that the test time is 5 minutes instead of 4 
minutes.

    Issued in Burlington, Massachusetts, on May 18, 2015.
Carlos Pestana,
Acting Manager, Engine & Propeller Directorate, Aircraft Certification 
Service.
[FR Doc. 2015-12986 Filed 5-27-15; 8:45 am]
BILLING CODE 4910-13-P