Document ID: FAA-2015-0486-0001
Agency: faa
Document Type: Proposed Rule
Title: Airworthiness Directives: Pratt&Whitney Canada Corp. Turboshaft Engines
Posted Date: 2015-06-19T04:00Z

[Federal Register Volume 80, Number 118 (Friday, June 19, 2015)]
[Proposed Rules]
[Pages 35260-35262]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2015-14986]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2015-0486; Directorate Identifier 2015-NE-07-AD]
RIN 2120-AA64

Airworthiness Directives; Pratt & Whitney Canada Corp. Turboshaft 
Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: We propose to adopt a new airworthiness directive (AD) for 
certain Pratt & Whitney Canada Corp. (P&WC) PT6B-37A turboshaft 
engines. This proposed AD was prompted by reports of incorrect engine 
torque for PT6B-37A engines. This proposed AD would require initial and 
repetitive inspections until replacement of the No. 10 bearing, and 
eventual replacement of the No. 9 bearing, both located in the engine 
reduction gearbox (RGB) assembly. We are proposing this AD to prevent 
axial migration of the No. 10 bearing in the engine RGB assembly, which 
could lead to engine overtorque, failure of the engine, in-flight 
shutdown, and loss of the rotorcraft.

DATES: We must receive comments on this proposed AD by August 18, 2015.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
     Mail: Docket Management Facility, U.S. Department of 
Transportation, 1200 New Jersey Avenue SE., West Building Ground Floor, 
Room W12-140, Washington, DC 20590-0001.
     Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.

[[Page 35261]]

     Fax: 202-493-2251.
    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; Web site: 
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 http://www.regulations.gov by searching for and locating Docket No. FAA-2015-
0486; or in person at the Docket Operations office 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 (MCAI), the 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: Barbara Caufield, Aerospace Engineer, 
Engine Certification Office, FAA, Engine & Propeller Directorate, 12 
New England Executive Park, Burlington, MA 01803; phone: 781-238-7146; 
fax: 781-238-7199; email: barbara.caufield@faa.gov.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposed AD. Send your comments to an address 
listed under the ADDRESSES section. Include ``Docket No. FAA-2015-0486; 
Directorate Identifier 2015-NE-07-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of this proposed AD. We 
will consider all comments received by the closing date and may amend 
this proposed AD based on those comments.
    We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact 
with FAA personnel concerning this proposed AD.

Discussion

    The Transport Canada Civil Aviation, which is the aviation 
authority for Canada, has issued Canada AD CF-2015-01, dated January 
20, 2015 (referred to hereinafter as ``the MCAI''), to correct an 
unsafe condition for the specified products. The MCAI states:

    Five incidences of incorrect engine torque indication have been 
reported for PT6B-37A engine installations on AW119MKII helicopters. 
A lower than actual engine torque indication due to a faulty 
indication system, particularly on a helicopter being operated at 
max allowable torque (90 to 110%) range, may result in undetected 
over-torque condition.
    Repeated over-torque conditions that are undetected and 
consequently are not corrected in accordance with conditional 
inspection requirements of original equipment manufacturer (OEM) 
Instructions for Continued Airworthiness (ICAs), may have a negative 
impact on the operational safety of the aircraft. Investigation by 
P&WC has determined the root cause of the subject torque indication 
anomaly to be the axial migration of part number (P/N) 3310433-03 
bearings at the engine torque sensing gear location.

    The axial migration of the No. 10 bearing is caused by non-optimal 
bearing internal clearance. This migration may cause an erroneous 
torque reading, possibly leading to engine overtorque and engine 
failure. We are also requiring replacement of the No. 9 bearing since 
it may also migrate, has the same part number as a No. 10 bearing, and 
could be installed in the same location as a No. 10 bearing.
    You may obtain further information by examining the MCAI in the AD 
docket on the Internet at http://www.regulations.gov by searching for 
and locating Docket No. FAA-2015-0486.

Related Service Information Under 1 CFR Part 51

    P&WC has issued Service Bulletin (SB) No. PT6B-72-39095, Revision 
No. 3, dated December 29, 2014. The service information describes 
procedures for inspecting affected bearings. This service information 
is reasonably available because the interested parties have access to 
it through their normal course of business or by the means identified 
in the ADDRESSES section of this NPRM.

Other Related Service Information

    P&WC has also issued SB No. PT6B-72-39092, Revision No. 4, dated 
December 29, 2014. The service information describes procedures for 
removing affected bearings.

FAA's Determination and Requirements of This Proposed AD

    This product has been approved by the aviation authority of Canada, 
and is approved for operation in the United States. Pursuant to our 
bilateral agreement with Canada, they have notified us of the unsafe 
condition described in the MCAI and service information referenced 
above. We are proposing this AD because we evaluated all information 
provided by Transport Canada Civil Aviation and determined the unsafe 
condition exists and is likely to exist or develop on other products of 
the same type design. This proposed AD would require initial and 
repetitive inspections until replacement of the No. 10 bearing, as well 
as eventual replacement of the No. 9 bearing, in the engine RGB 
assembly.

Costs of Compliance

    We estimate that this proposed AD affects 83 engines installed on 
rotorcraft of U.S. registry. We estimate that it would take about 3 
hours per engine to perform the initial and repetitive inspections to 
comply with this proposed AD. We also estimate that it would take about 
1 hour per engine to replace the affected bearings. The average labor 
rate is $85 per hour. Required parts cost about $49,800 per engine. 
Based on these figures, we estimate the cost of this proposed AD on 
U.S. operators to be $4,161,620.

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 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 responsibilities among the various levels of government.

[[Page 35262]]

    For the reasons discussed above, I certify this 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. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive (AD):

Pratt & Whitney Canada Corp.: Docket No. FAA-2015-0486; Directorate 
Identifier 2015-NE-07-AD.

(a) Comments Due Date

    We must receive comments by August 18, 2015.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to Pratt & Whitney Canada Corp. (P&WC) PT6B-37A 
turboshaft engines with engine serial numbers identified in Table 1 
of paragraph 4, Appendix, in P&WC Service Bulletin (SB) No. PT6B-72-
39095, Revision No. 3, dated December 29, 2014.

(d) Reason

    This AD was prompted by reports of incorrect engine torque for 
PT6B-37A turboshaft engines. We are issuing this AD to prevent axial 
migration of the No. 10 bearing in the engine reduction gearbox 
(RGB) assembly, which could lead to engine overtorque, failure of 
the engine, in-flight shutdown, and loss of the rotorcraft.

(e) Actions and Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(1) Initial Inspection

    (i) Within 50 flight hours (FHs) time in service after the 
effective date of this AD, inspect the No. 10 bearing, part number 
(P/N) 3310433-03, in the RGB assembly for axial movement. Use 
paragraphs 3.A. to 3.C. in the Accomplishment Instructions in P&WC 
SB No. PT6B-72-39095, Revision No. 3, dated December 29, 2014, to do 
the inspection. If the bearing fails the inspection, replace the No. 
9 and No. 10 bearings before further flight.

(2) Repetitive Inspection

    (i) For engines with 500 FHs or less total time since new (TSN), 
repeat the inspection required by paragraph (e)(1) of this AD every 
100 FHs time since last inspection (TSLI) until 500 hours total TSN, 
and, thereafter, every 200 FHs TSLI until removal.
    (ii) For engines with more than 500 FHs total TSN perform the 
inspection required by paragraph (e)(1) to this AD within 200 FHs 
TSLI, and, thereafter, every 200 FHs TSLI until removal.

(3) Removal and Replacement of Affected Bearings

    (i) For engine serial numbers (S/Ns) PCE-PU0192, PU0193, PU0201, 
PU0208, PU0209, PU0212, PU0213, PU0214, PU0216, PU0219, and PU0220, 
remove the No. 9 and No. 10 bearings, P/N 3310433-03, within 450 FHs 
or 42 months after the effective date of this AD, whichever occurs 
first, and replace with parts eligible for installation.
    (ii) For all engine S/Ns identified in Applicability paragraph 
(c) of this AD, other than those listed in paragraph (e)(3)(i) of 
this AD, remove the No. 9 and No. 10 bearings, P/N 3310433-03, and 
replace with parts eligible for installation within 42 months after 
the effective date of this AD.
    (iii) Replacement of the No. 9 and No. 10 bearing, P/N 3310433-
03, with the No. 9 and No. 10 bearing, P/N 3310233-03 or P/N 
3310533-03, is terminating action for this AD.

(f) Reporting Requirements

    You do not have to contact your Local Field Service 
Representative as discussed in paragraph 3.C.(3) of P&WC SB No. 
PT6B-72-39095, Revision No. 3, dated December 29, 2014.

(g) Credit for Previous Action

    If you previously replaced the No. 9 and No. 10 bearings in 
accordance with the instructions contained in P&WC SB No. PT6B-72-
39092, Revision No. 2, dated August 8, 2014, or earlier revisions, 
then you have complied with this AD.

(h) Alternative Methods of Compliance (AMOCs)

    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 Barbara 
Caufield, Aerospace Engineer, Engine Certification Office, FAA, 
Engine & Propeller Directorate, 12 New England Executive Park, 
Burlington, MA 01803; phone: 781-238-7146; fax: 781-238-7199; email: 
barbara.caufield@faa.gov.
    (2) Refer to MCAI Transport Canada AD CF-2015-01, dated January 
20, 2015, for more information. You may examine the MCAI in the AD 
docket on the Internet at http://www.regulations.gov by searching 
for and locating it in Docket No. FAA-2015-0486.
    (3) P&WC SB No. PT6B-72-39092, Revision No. 4, dated December 
29, 2014, and SB No. PT6B-72-39095, Revision No. 3, dated December 
29, 2014, can be obtained from P&WC using the contact information in 
paragraph (i)(4) of this proposed AD.
    (4) 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.
    (5) 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 June 10, 2015.
Ann C. Mollica,
Acting Directorate Manager, Engine & Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 2015-14986 Filed 6-18-15; 8:45 am]
 BILLING CODE 4910-13-P