Airworthiness Directives; Pratt & Whitney Canada Corp. Turboprop Engines, 71031-71033 [2014-28188]

Download as PDF 71031 Proposed Rules Federal Register Vol. 79, No. 230 Monday, December 1, 2014 This section of the FEDERAL REGISTER contains notices to the public of the proposed issuance of rules and regulations. The purpose of these notices is to give interested persons an opportunity to participate in the rule making prior to the adoption of the final rules. DEPARTMENT OF AGRICULTURE Agricultural Marketing Service 7 CFR Part 915 [Docket No. AMS–FV–14–0080; FV15–915– 1 CR] Avocados Grown in South Florida; Continuance Referendum Agricultural Marketing Service, USDA. ACTION: Referendum order. AGENCY: This document directs that a referendum be conducted among eligible producers of avocados grown in South Florida to determine whether they favor continuance of the marketing order regulating the handling of avocados grown in the production area. DATES: The referendum will be conducted from January 12 through January 27, 2015. To vote in this referendum, producers must have produced Florida avocados within the designated production area during the period April 1, 2013, through March 31, 2014. ADDRESSES: Copies of the marketing order may be obtained from the referendum agents at 1124 First Street South, Winter Haven, FL 33880, or the Office of the Docket Clerk, Marketing Order and Agreement Division, Fruit and Vegetable Program, AMS, USDA, 1400 Independence Avenue SW., STOP 0237, Washington, DC 20250–0237; Fax: (202) 720–8938; or Internet: www.regulations.gov. FOR FURTHER INFORMATION CONTACT: Doris Jamieson, Marketing Specialist, or Christian D. Nissen, Regional Director, Southeast Marketing Field Office, Marketing Order and Agreement Division, Fruit and Vegetable Program, AMS, USDA, 1124 First Street South, Winter Haven, FL 33880; Telephone: (863) 324–3375, Fax: (863) 291–8614, or Email: Doris.Jamieson@ams.usda.gov or Christian.Nissen@ams.usda.gov. SUPPLEMENTARY INFORMATION: Pursuant to Marketing Order No. 915, as amended asabaliauskas on DSK5VPTVN1PROD with PROPOSALS SUMMARY: VerDate Sep<11>2014 19:22 Nov 28, 2014 Jkt 235001 (7 CFR part 915), hereinafter referred to as the ‘‘order,’’ and the applicable provisions of the Agricultural Marketing Agreement Act of 1937, as amended (7 U.S.C. 601–674), hereinafter referred to as the ‘‘Act,’’ it is hereby directed that a referendum be conducted to ascertain whether continuance of the order is favored by producers. The referendum shall be conducted from January 12 through January 27, 2015, among Florida avocados growers in the production area. Only Florida avocado producers that were engaged in the production of Florida avocado, during the period of April 1, 2013, through March 31, 2014, may participate in the continuance referendum. USDA has determined that continuance referenda are an effective means for determining whether producers favor the continuation of marketing order programs. USDA would consider termination of the order if less than two-thirds of the producers voting in the referendum and less than twothirds of the volume of Florida avocados represented in the referendum favor continuance. In evaluating the merits of continuance versus termination, USDA will not exclusively consider the results of the continuance referendum. USDA will also consider all other relevant information concerning the operation of the order and the relative benefits and disadvantages to producers, handlers, and consumers in order to determine whether continued operation of the order would tend to effectuate the declared policy of the Act. In accordance with the Paperwork Reduction Act of 1995 (44 U.S.C. 3501– 3520), the ballot materials to be used in the referendum have been submitted to and approved by the Office of Management and Budget (OMB) and have been assigned OMB No. 0581– 0189, Generic Fruit Crops. It has been estimated that it will take an average of 20 minutes for each of the approximately 300 producers of Florida avocados to cast a ballot. Participation is voluntary. Ballots postmarked after January 27, 2015, will not be included in the vote tabulation. Doris Jamieson and Christian D. Nissen of the Southeast Marketing Field Office, Fruit and Vegetable Program, AMS, USDA, are hereby designated as the referendum agents of the Secretary of Agriculture to conduct this referendum. The procedure applicable PO 00000 Frm 00001 Fmt 4702 Sfmt 4702 to the referendum shall be the ‘‘Procedure for the Conduct of Referenda in Connection With Marketing Orders for Fruits, Vegetables, and Nuts Pursuant to the Agricultural Marketing Agreement Act of 1937, as Amended’’ (7 CFR 900.400–900.407). Ballots will be mailed to all producers of record and may also be obtained from the referendum agents, or from their appointees. List of Subjects in 7 CFR Part 915 Avocados, Reporting and recordkeeping requirements. Authority: 7 U.S.C. 601–674. Dated: November 25, 2014. Rex A. Barnes, Associate Administrator, Agricultural Marketing Service. [FR Doc. 2014–28288 Filed 11–28–14; 8:45 am] BILLING CODE P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2013–0766; Directorate Identifier 2013–NE–26–AD] RIN 2120–AA64 Airworthiness Directives; Pratt & Whitney Canada Corp. Turboprop Engines Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: We propose to revise airworthiness directive (AD) 2014–17– 08 that applies to all Pratt & Whitney Canada Corp. (P&WC) PT6A–114 and PT6A–114A turboprop engines. AD 2014–17–08 requires initial and repetitive borescope inspections (BSIs) of compressor turbine (CT) blades, and the removal from service of blades that fail inspection. Since we issued AD 2014–17–08, P&WC developed an additional single crystal CT blade that corrects the unsafe condition. This proposed AD would retain all the requirements of AD 2014–17–08, add an additional single crystal CT blade that corrects the unsafe condition, reduce the affected population, and correct the Credit for Previous Action paragraph. SUMMARY: E:\FR\FM\01DEP1.SGM 01DEP1 71032 Federal Register / Vol. 79, No. 230 / Monday, December 1, 2014 / Proposed Rules We are proposing this AD to prevent failure of CT blades, which could result in damage to the engine and damage to the airplane. DATES: We must receive comments on this proposed AD by January 30, 2015. ADDRESSES: You may send comments, using the procedures found in 14 CFR 11.43 and 11.45, by any of the following methods: • Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments. • Fax: 202–493–2251. • Mail: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE., Washington, DC 20590. • Hand Delivery: Deliver to Mail address above between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For service information identified in this proposed AD, contact Pratt & Whitney Canada Corp., 1000 MarieVictorin, Longueuil, Quebec, Canada, J4G 1A1; phone: 800–268–8000; fax: 450–647–2888; Internet: www.pwc.ca. You may view this service information at the FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA. For information on the availability of this material at the FAA, call 781–238–7125. asabaliauskas on DSK5VPTVN1PROD with PROPOSALS Examining the AD Docket section. Include ‘‘Docket No. FAA– 2013–0766; Directorate Identifier 2013– NE–26–AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this NPRM. We will consider all comments received by the closing date and may amend this NPRM because of those comments. We will post all comments we receive, without change, to https:// www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive about this NPRM. Discussion Actions Since AD 2014–17–08 Was Issued Title 49 of the United States Code specifies the FAA’s authority to issue rules on aviation safety. Subtitle I, Section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency’s authority. We are issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701, ‘‘General requirements.’’ Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action. Comments Invited FAA’s Determination We invite you to send any written relevant data, views, or arguments about this NPRM. Send your comments to an address listed under the ADDRESSES We are proposing this NPRM because we evaluated all the relevant information and determined the unsafe condition described previously is likely Jkt 235001 This NPRM would require initial and repetitive BSIs of CT blades, and the removal from service of blades that fail inspection. This NPRM would also require as a mandatory terminating action, replacement of non-single crystal CT blades with single crystal CT blades at the next shop visit. This NPRM also corrects the reference to single crystal CT blades in the Credit for Previous Action paragraph. This NPRM also reduces the affected population by introducing a new single crystal CT blade P/N that addresses the unsafe condition. Costs of Compliance Since we issued AD 2014–17–08 (79 FR 52172, September 3, 2014), P&WC developed a new single crystal CT blade, P/N 3079351–01, to correct the unsafe condition. The addition of this new P/N reduces the affected population. Finally, we determined that in AD 2014–07–08, we gave credit for action that is inapplicable to the unsafe condition. Specifically, in the Credit for Previous Action paragraph, the AD allows credit for a previously performed metallurgical examination of ‘‘single crystal CT blades’’. Metallurgical examination of single crystal CT blades is inapplicable to the non-single crystal CT blades referenced in Compliance paragraph (e)(1)(iii)(B) of this NPRM. 19:22 Nov 28, 2014 Proposed AD Requirements On August 18, 2014, we issued AD 2014–17–08, Amendment 39–17961 (79 FR 52172, September 3, 2014), (‘‘AD 2014–17–08’’), for all P&WC PT6A–114 and PT6A–114A turboprop engines. AD 2014–17–08 requires initial and repetitive BSIs of CT blades, and the removal from service of blades that fail inspection. AD 2014–17–08 resulted from several incidents of CT blade failure, causing power loss, and engine failure. We issued AD 2014–17–08 to prevent failure of CT blades, which could result in damage to the engine and damage to the airplane. You may examine the AD docket on the Internet at https:// www.regulations.gov by searching for and locating Docket No. FAA–2013– 0766; or in person at the Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this proposed AD, the mandatory continuing airworthiness information, regulatory evaluation, any comments received, and other information. The address for the Docket Office (phone: 800–647–5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Robert Morlath, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; phone: 781–238–7154; fax: 781–238– 7199; email: robert.c.morlath@faa.gov. SUPPLEMENTARY INFORMATION: VerDate Sep<11>2014 to exist or develop in other products of the same type design. Relevant Service Information We reviewed P&WC Service Bulletin (SB) No. PT6A–72–1669, Revision 9, dated June 28, 2013. The service information describes procedures for correcting the unsafe condition. PO 00000 Frm 00002 Fmt 4702 Sfmt 4702 We estimate that this proposed AD affects 300 engines installed on airplanes of U.S. registry. We also estimate that it would take about 4 hours per engine to perform the required inspection and 8 hours to replace the blades. The average labor rate is $85 per hour. Required parts cost about $59,334 per engine. Based on these figures, we estimate the cost of this proposed AD on U.S. operators to be $18,106,200. Authority for This Rulemaking Regulatory Findings We have determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would not have a substantial direct effect on the States, on the relationship between the national Government and the States, or on the distribution of power and E:\FR\FM\01DEP1.SGM 01DEP1 Federal Register / Vol. 79, No. 230 / Monday, December 1, 2014 / Proposed Rules responsibilities among the various levels of government. For the reasons discussed above, I certify that the proposed regulation: (1) Is not a ‘‘significant regulatory action’’ under Executive Order 12866, (2) Is not a ‘‘significant rule’’ under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979), (3) Will not affect intrastate aviation in Alaska to the extent that it justifies making a regulatory distinction, and (4) Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows: PART 39—AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: ■ Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. Amend § 39.13 by removing airworthiness directive (AD) 2014–17– 08, Amendment 39–17961 (79 FR 52172, September 3, 2014), and adding the following new AD: ■ Pratt & Whitney Canada Corp.: Docket No. FAA–2013–0766; Directorate Identifier 2013–NE–26–AD. (a) Comments Due Date We must receive comments by January 30, 2015. asabaliauskas on DSK5VPTVN1PROD with PROPOSALS (b) Affected ADs This AD replaces AD 2014–17–08, Amendment 39–17961 (79 FR 52172, September 3, 2014). (c) Applicability This AD applies to all Pratt & Whitney Canada Corp. (P&WC) PT6A–114 and PT6A– 114A turboprop engines. (d) Unsafe Condition This AD was prompted by several incidents of compressor turbine (CT) blade failure, causing power loss, and engine failure. We are issuing this AD to prevent failure of CT blades, which could lead to damage to the engine and damage to the airplane. VerDate Sep<11>2014 19:22 Nov 28, 2014 Jkt 235001 (e) Compliance Comply with this AD within the compliance times specified, unless already done. (1) For engines installed with CT blades other than P&WC single crystal CT blades, part numbers (P/Ns) 3072791–01, 3072791– 02, or 3079351–01, do the following: (i) Until removed, per the requirements of this AD, borescope inspect the CT blade leading and trailing edges, within the following intervals, whichever occurs later: (A) 150 operating hours after October 8, 2014; or (B) 500 operating hours since new; or (C) 500 operating hours since last borescope inspection (BSI) of the CT blades; or (D) Before next flight after the effective date of this AD. (ii) Thereafter, repeat the inspection required by paragraph (e)(1)(i) of this AD every 500 flight hours time since last inspection. (iii) At the next hot section inspection (HSI) after the effective date of this AD, and each HSI thereafter, replace the complete set of CT blades with any of the following: (A) New CT blades; (B) CT blades that have passed a two-blade metallurgical inspection. Use paragraph 3.B., Accomplishment Instructions, of P&WC Service Bulletin (SB) No. PT6A–72–1669, Revision 9, dated June 28, 2013, to do the inspection; or (C) P&WC single crystal CT blades, P/Ns 3072791–01, 3072791–02, or 3079351–01. (2) Replacement of the complete set of CT blades with single crystal CT blades, P/Ns 3072791–01, 3072791–02, or 3079351–01 is terminating action for the requirements of paragraph (e)(1) of this AD. (3) By October 8, 2017, replace the complete set of CT blades with P&WC single crystal CT blades, P/Ns 3072791–01, 3072791–02, or 3079351–01. (g) Credit for Previous Action Performance of the metallurgical examination specified in paragraph (e)(1)(iii)(B) of this AD on CT blades other than P&WC single crystal CT blades, P/Ns 3072791–01, 3072791–02, or 3079351–01, before the effective date of this AD fulfils the initial inspection requirements of paragraph (e)(1)(i) of this AD. However, you must still comply with the repetitive BSI requirement of paragraph (e)(1)(ii) of this AD until you complete the mandatory terminating action of paragraph (e)(3) of this AD. (h) Alternative Methods of Compliance (AMOCs) (1) AMOCs previously approved for AD 2014–17–08, Amendment 39–17961 (79 FR 52172, September 3, 2014) are approved for this AD. (2) The Manager, Engine Certification Office, FAA, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request. You may email your request to: ANE–AD–AMOC@faa.gov. (i) Related Information (1) For more information about this AD, contact Robert Morlath, Aerospace Engineer, PO 00000 Frm 00003 Fmt 4702 Sfmt 4702 71033 Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; phone: 781–238–7154; fax: 781–238–7199; email: robert.c.morlath@faa.gov. (2) Refer to MCAI Transport Canada Civil Aviation AD CF–2013–21R1, dated November 13, 2013, for more information. You may examine the MCAI in the AD docket on the Internet at https:// www.regulations.gov/ #!documentDetail;D=FAA-2013-0766-0008. (3) P&WC SB No. PT6A–72–1669, Revision 9, dated June 28, 2013, which is not incorporated by reference in this AD, can be obtained from P&WC, using the contact information in paragraph (i)(4) of this AD. (4) For service information identified in this AD, contact Pratt & Whitney Canada Corp., 1000 Marie-Victorin, Longueuil, Quebec, Canada, J4G 1A1; phone: 800–268– 8000; fax: 450–647–2888; Internet: www.pwc.ca. (5) Guidance for performing the BSI of the CT blades leading and trailing edges can be found in paragraph 3.A, Accomplishment Instructions, P&WC SB No. PT6A–72–1669, Revision 9, dated June 28, 2013. (6) You may view this service information at the FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA. For information on the availability of this material at the FAA, call 781–238–7125. Issued in Burlington, Massachusetts, on November 20, 2014. Colleen M. D’Alessandro, Assistant Directorate Manager, Engine & Propeller Directorate, Aircraft Certification Service. [FR Doc. 2014–28188 Filed 11–28–14; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2014–0779; Directorate Identifier 2014–NM–052–AD] RIN 2120–AA64 Airworthiness Directives; Lockheed Martin Corporation/Lockheed Martin Aeronautics Company Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: We propose to adopt a new airworthiness directive (AD) for all Lockheed Martin Corporation/Lockheed Martin Aeronautics Company Model 382, 382B, 382E, 382F, and 382G airplanes. This proposed AD was prompted by an evaluation by the design approval holder (DAH) indicating that the outer wings are subject to widespread fatigue damage (WFD). This proposed AD would SUMMARY: E:\FR\FM\01DEP1.SGM 01DEP1

Agencies

[Federal Register Volume 79, Number 230 (Monday, December 1, 2014)]
[Proposed Rules]
[Pages 71031-71033]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2014-28188]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2013-0766; Directorate Identifier 2013-NE-26-AD]
RIN 2120-AA64


Airworthiness Directives; Pratt & Whitney Canada Corp. Turboprop 
Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: We propose to revise airworthiness directive (AD) 2014-17-08 
that applies to all Pratt & Whitney Canada Corp. (P&WC) PT6A-114 and 
PT6A-114A turboprop engines. AD 2014-17-08 requires initial and 
repetitive borescope inspections (BSIs) of compressor turbine (CT) 
blades, and the removal from service of blades that fail inspection. 
Since we issued AD 2014-17-08, P&WC developed an additional single 
crystal CT blade that corrects the unsafe condition. This proposed AD 
would retain all the requirements of AD 2014-17-08, add an additional 
single crystal CT blade that corrects the unsafe condition, reduce the 
affected population, and correct the Credit for Previous Action 
paragraph.

[[Page 71032]]

We are proposing this AD to prevent failure of CT blades, which could 
result in damage to the engine and damage to the airplane.

DATES: We must receive comments on this proposed AD by January 30, 
2015.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:
     Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: 202-493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE., Washington, DC 20590.
     Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    For service information identified in this proposed AD, contact 
Pratt & Whitney Canada Corp., 1000 Marie-Victorin, Longueuil, Quebec, 
Canada, J4G 1A1; phone: 800-268-8000; fax: 450-647-2888; Internet: 
www.pwc.ca. You may view this service information at the FAA, Engine & 
Propeller Directorate, 12 New England Executive Park, Burlington, MA. 
For information on the availability of this material at the FAA, call 
781-238-7125.

Examining the AD Docket

    You may examine the AD docket on the Internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2013-
0766; or in person at the Docket Management Facility between 9 a.m. and 
5 p.m., Monday through Friday, except Federal holidays. The AD docket 
contains this proposed AD, the mandatory continuing airworthiness 
information, regulatory evaluation, any comments received, and other 
information. The address for the Docket Office (phone: 800-647-5527) is 
in the ADDRESSES section. Comments will be available in the AD docket 
shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Robert Morlath, Aerospace Engineer, 
Engine Certification Office, FAA, Engine & Propeller Directorate, 12 
New England Executive Park, Burlington, MA 01803; phone: 781-238-7154; 
fax: 781-238-7199; email: robert.c.morlath@faa.gov.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this NPRM. Send your comments to an address listed 
under the ADDRESSES section. Include ``Docket No. FAA-2013-0766; 
Directorate Identifier 2013-NE-26-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of this NPRM. We will 
consider all comments received by the closing date and may amend this 
NPRM because of those comments.
    We will post all comments we receive, without change, to https://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this NPRM.

Discussion

    On August 18, 2014, we issued AD 2014-17-08, Amendment 39-17961 (79 
FR 52172, September 3, 2014), (``AD 2014-17-08''), for all P&WC PT6A-
114 and PT6A-114A turboprop engines. AD 2014-17-08 requires initial and 
repetitive BSIs of CT blades, and the removal from service of blades 
that fail inspection. AD 2014-17-08 resulted from several incidents of 
CT blade failure, causing power loss, and engine failure. We issued AD 
2014-17-08 to prevent failure of CT blades, which could result in 
damage to the engine and damage to the airplane.

Actions Since AD 2014-17-08 Was Issued

    Since we issued AD 2014-17-08 (79 FR 52172, September 3, 2014), 
P&WC developed a new single crystal CT blade, P/N 3079351-01, to 
correct the unsafe condition. The addition of this new P/N reduces the 
affected population. Finally, we determined that in AD 2014-07-08, we 
gave credit for action that is inapplicable to the unsafe condition. 
Specifically, in the Credit for Previous Action paragraph, the AD 
allows credit for a previously performed metallurgical examination of 
``single crystal CT blades''. Metallurgical examination of single 
crystal CT blades is inapplicable to the non-single crystal CT blades 
referenced in Compliance paragraph (e)(1)(iii)(B) of this NPRM.

Relevant Service Information

    We reviewed P&WC Service Bulletin (SB) No. PT6A-72-1669, Revision 
9, dated June 28, 2013. The service information describes procedures 
for correcting the unsafe condition.

FAA's Determination

    We are proposing this NPRM because we evaluated all the relevant 
information and determined the unsafe condition described previously is 
likely to exist or develop in other products of the same type design.

Proposed AD Requirements

    This NPRM would require initial and repetitive BSIs of CT blades, 
and the removal from service of blades that fail inspection. This NPRM 
would also require as a mandatory terminating action, replacement of 
non-single crystal CT blades with single crystal CT blades at the next 
shop visit. This NPRM also corrects the reference to single crystal CT 
blades in the Credit for Previous Action paragraph. This NPRM also 
reduces the affected population by introducing a new single crystal CT 
blade P/N that addresses the unsafe condition.

Costs of Compliance

    We estimate that this proposed AD affects 300 engines installed on 
airplanes of U.S. registry. We also estimate that it would take about 4 
hours per engine to perform the required inspection and 8 hours to 
replace the blades. The average labor rate is $85 per hour. Required 
parts cost about $59,334 per engine. Based on these figures, we 
estimate the cost of this proposed AD on U.S. operators to be 
$18,106,200.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, Section 106, describes the 
authority of the FAA Administrator. Subtitle VII, Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    We are issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701, ``General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    We have determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would not 
have a substantial direct effect on the States, on the relationship 
between the national Government and the States, or on the distribution 
of power and

[[Page 71033]]

responsibilities among the various levels of government.
    For the reasons discussed above, I certify that the proposed 
regulation:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Is not a ``significant rule'' under the DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979),
    (3) Will not affect intrastate aviation in Alaska to the extent 
that it justifies making a regulatory distinction, and
    (4) Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

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


Sec.  39.13  [Amended]

0
2. Amend Sec.  39.13 by removing airworthiness directive (AD) 2014-17-
08, Amendment 39-17961 (79 FR 52172, September 3, 2014), and adding the 
following new AD:

Pratt & Whitney Canada Corp.: Docket No. FAA-2013-0766; Directorate 
Identifier 2013-NE-26-AD.

(a) Comments Due Date

    We must receive comments by January 30, 2015.

(b) Affected ADs

    This AD replaces AD 2014-17-08, Amendment 39-17961 (79 FR 52172, 
September 3, 2014).

(c) Applicability

    This AD applies to all Pratt & Whitney Canada Corp. (P&WC) PT6A-
114 and PT6A-114A turboprop engines.

(d) Unsafe Condition

    This AD was prompted by several incidents of compressor turbine 
(CT) blade failure, causing power loss, and engine failure. We are 
issuing this AD to prevent failure of CT blades, which could lead to 
damage to the engine and damage to the airplane.

(e) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.
    (1) For engines installed with CT blades other than P&WC single 
crystal CT blades, part numbers (P/Ns) 3072791-01, 3072791-02, or 
3079351-01, do the following:
    (i) Until removed, per the requirements of this AD, borescope 
inspect the CT blade leading and trailing edges, within the 
following intervals, whichever occurs later:
    (A) 150 operating hours after October 8, 2014; or
    (B) 500 operating hours since new; or
    (C) 500 operating hours since last borescope inspection (BSI) of 
the CT blades; or
    (D) Before next flight after the effective date of this AD.
    (ii) Thereafter, repeat the inspection required by paragraph 
(e)(1)(i) of this AD every 500 flight hours time since last 
inspection.
    (iii) At the next hot section inspection (HSI) after the 
effective date of this AD, and each HSI thereafter, replace the 
complete set of CT blades with any of the following:
    (A) New CT blades;
    (B) CT blades that have passed a two-blade metallurgical 
inspection. Use paragraph 3.B., Accomplishment Instructions, of P&WC 
Service Bulletin (SB) No. PT6A-72-1669, Revision 9, dated June 28, 
2013, to do the inspection; or
    (C) P&WC single crystal CT blades, P/Ns 3072791-01, 3072791-02, 
or 3079351-01.
    (2) Replacement of the complete set of CT blades with single 
crystal CT blades, P/Ns 3072791-01, 3072791-02, or 3079351-01 is 
terminating action for the requirements of paragraph (e)(1) of this 
AD.
    (3) By October 8, 2017, replace the complete set of CT blades 
with P&WC single crystal CT blades, P/Ns 3072791-01, 3072791-02, or 
3079351-01.

(g) Credit for Previous Action

    Performance of the metallurgical examination specified in 
paragraph (e)(1)(iii)(B) of this AD on CT blades other than P&WC 
single crystal CT blades, P/Ns 3072791-01, 3072791-02, or 3079351-
01, before the effective date of this AD fulfils the initial 
inspection requirements of paragraph (e)(1)(i) of this AD. However, 
you must still comply with the repetitive BSI requirement of 
paragraph (e)(1)(ii) of this AD until you complete the mandatory 
terminating action of paragraph (e)(3) of this AD.

(h) Alternative Methods of Compliance (AMOCs)

    (1) AMOCs previously approved for AD 2014-17-08, Amendment 39-
17961 (79 FR 52172, September 3, 2014) are approved for this AD.
    (2) The Manager, Engine Certification Office, FAA, may approve 
AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make 
your request. You may email your request to: ANE-AD-AMOC@faa.gov.

(i) Related Information

    (1) For more information about this AD, contact Robert Morlath, 
Aerospace Engineer, Engine Certification Office, FAA, Engine & 
Propeller Directorate, 12 New England Executive Park, Burlington, MA 
01803; phone: 781-238-7154; fax: 781-238-7199; email: 
robert.c.morlath@faa.gov.
    (2) Refer to MCAI Transport Canada Civil Aviation AD CF-2013-
21R1, dated November 13, 2013, for more information. You may examine 
the MCAI in the AD docket on the Internet at https://www.regulations.gov/#!documentDetail;D=FAA-2013-0766-0008.
    (3) P&WC SB No. PT6A-72-1669, Revision 9, dated June 28, 2013, 
which is not incorporated by reference in this AD, can be obtained 
from P&WC, using the contact information in paragraph (i)(4) of this 
AD.
    (4) For service information identified in this AD, contact Pratt 
& Whitney Canada Corp., 1000 Marie-Victorin, Longueuil, Quebec, 
Canada, J4G 1A1; phone: 800-268-8000; fax: 450-647-2888; Internet: 
www.pwc.ca.
    (5) Guidance for performing the BSI of the CT blades leading and 
trailing edges can be found in paragraph 3.A, Accomplishment 
Instructions, P&WC SB No. PT6A-72-1669, Revision 9, dated June 28, 
2013.
    (6) You may view this service information at the FAA, Engine & 
Propeller Directorate, 12 New England Executive Park, Burlington, 
MA. For information on the availability of this material at the FAA, 
call 781-238-7125.

    Issued in Burlington, Massachusetts, on November 20, 2014.
Colleen M. D'Alessandro,
Assistant Directorate Manager, Engine & Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 2014-28188 Filed 11-28-14; 8:45 am]
BILLING CODE 4910-13-P

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