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Rules and Regulations Federal Register

38913 

Vol. 80, No. 130 

Wednesday, July 8, 2015 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 33 

[Docket No.FAA–2015–1771; Special 

Conditions No. 33–016–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: Final special conditions. 

SUMMARY: These special conditions are 

issued 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 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: Effective August 7, 2015. 

FOR FURTHER INFORMATION CONTACT: For 

technical questions concerning these 

special conditions, 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; email tara.fitzgerald@faa.gov. For 

legal questions concerning these special 

conditions, 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: 

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 

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 § 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 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 § 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 § 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 § 11.38, and they become part of 

the type-certification basis under 

§ 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. 


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38914 Federal Register / Vol. 80, No. 130 / Wednesday, July 8, 2015 / Rules and Regulations 

Discussion 

These 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 §§ 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 

§ 33.87(f) is divided among the two 

ratings. We propose special conditions 

based on revised requirements of 

§ 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 § 33.28(k) 

applicable to the 30-second OEI rating 

from 30 seconds to 2.5 minutes. This 

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 § 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. 

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. 

List of Subjects in 14 CFR Part 33 

Aircraft, Engines, Aviation Safety, 

Reporting and Recordkeeping 

requirements. 

The authority citation for these 

special conditions is as follows: 

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

44702, 44704. 

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 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 

§ 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 § 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 § 33.87(f)(2) and (3) 

must be run continuously for the 

duration of 2.5 minutes, and 

(3) The tests in § 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 § 33.88(b) except that the test time is 

5 minutes instead of 4 minutes. 

Issued in Burlington, Massachusetts, on 

June 26, 2015. 

Ann C. Mollica, 

Acting Manager, Engine & Propeller 

Directorate, Aircraft Certification Service. 

[FR Doc. 2015–16713 Filed 7–7–15; 8:45 am] 

BILLING CODE 4910–13–P 


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