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2020-13-06 PRATT & WHITNEY CANADA CORP.:
Amendment 39-21151; Docket No. FAA2019-0395; Project Identifier 2019-NE-11-AD.

(a) EFFECTIVE DATE

    This AD is effective August 6, 2020.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD  applies  to  Pratt & Whitney Canada Corp. (P&WC) PW150A model
    turboprop engines with a high-pressure (HP) centrifugal impeller, part
    number (P/N) 3049127-01, installed.

(d) SUBJECT

    Joint Aircraft System Component (JASC) 7230, Turbine Engine Compressor
    Section.

(e) UNSAFE CONDITION

    This AD was prompted by a determination  by the manufacturer that cer-
    tain HP centrifugal impellers installed on P&WC PW150A model turboprop
    engines  may  exhibit a  material  microstructure anomaly  that  has a
    potential to adversely affect the low cycle fatigue characteristics of
    the part. The FAA is issuing  this AD to prevent failure of  a certain
    HP centrifugal impeller. The unsafe condition, if not addressed, could
    result in uncontained release  of the HP centrifugal  impeller, damage
    to the engine, and damage to the airplane.

(f) COMPLIANCE

    Comply with this AD within the compliance times specified,  unless al-
    ready done.

(g) REQUIRED ACTIONS

    Remove HP centrifugal impeller, P/N 3049127-01, with any serial number
    (S/N) listed  in Table 2 of P&WC Service Bulletin  (SB)  No. PW150-72-
    35331, Revision No. 1, dated May 3, 2016,  prior to accumulating 8,000
    flight cycles since new  or  within 150 flight cycles after the effec-
    tive date of this AD,  whichever occurs later, and replace with a part
    eligible for installation.

(h) INSTALLATION PROHIBITION

    After the effective date of this AD,  do not install an HP centrifugal
    impeller, P/N 3049127-01,  with any S/N listed in Table 1 or 2 of P&WC
    SB No. PW150-72-35331,  Revision No. 1,  dated May 3, 2016,  onto  any
    engine.

(i) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The Manager, ECO Branch,  FAA,  has the authority to approve AMOCs for
    this AD, if requested using the  procedures found in 14 CFR 39.19.  In
    accordance with  14 CFR  39.19, send  your request  to your  principal
    inspector or local Flight Standards District Office,  as  appropriate.
    If sending information directly to the manager of the ECO Branch, send
    it to the  attention of the  person identified in  paragraph (j)(1) of
    this AD. You may email your request to: ANE-AD-AMOC@faa.gov.

(2) Before using any approved AMOC,  notify your appropriate principal in-
    spector,  or  lacking a principal inspector,  the manager of the local
    flight standards district office/certificate holding district office.

(j) RELATED INFORMATION

(1) For more information about this AD contact Barbara Caufield, Aerospace
    Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA, 01803
    phone 781-238-7146; fax 781-238-7199; email barbara.caufield@faa.gov.

(2) Refer to Transport Canada Civil Aviation (TCCA)  AD CF-2018-12,  dated
    April 27, 2018,  for more information.  You may examine the TCCA AD in
    the  AD  docket  on  the  Internet  at  https://www.regulations.gov by
    searching for and locating Docket No. FAA-2019-0395.

(k) MATERIAL INCORPORATED BY REFERENCE

(1) The Director of the Federal Register  approved  the  incorporation  by
    reference (IBR) of the service information listed  in  this  paragraph
    under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) You must use  this service information as applicable to do the actions
    required by this AD, unless the AD specifies otherwise.

(i) Pratt & Whitney Canada Corp.  (P&WC)  Service Bulletin PW150-72-35331,
    Revision No. 1, dated May 3, 2016.

(ii) [Reserved]

(3) For P&WC 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: https://
    www.pwc.ca.

(4) You may view this service information at FAA,  Airworthiness  Products
    Section, Operational Safety Branch,  1200 District Avenue, Burlington,
    MA, 01803. For information on the availability of this material at the
    FAA, call 781-238-7759.

(5) You  may  view  this  service  information  that  is  incorporated  by
    reference at the National Archives and Records Administration  (NARA).
    For information on the availability of this material  at NARA,  email:
    fedreg.legal@nara.gov,  or  go  to:  https://www.archives.gov/federal-
    register/cfr/ibr-locations.html.

Issued on June 17, 2020.  Lance T. Gant, Director, Compliance & Airworthi-
ness Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT: Barbara Caufield, Aerospace Engineer, ECO
Branch, FAA, 1200 District Avenue, Burlington, MA, 01803;  phone: 781-238-
7146; fax: 781-238-7199; email: barbara.caufield@faa.gov
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2019-0395; Project Identifier 2019-NE-11-AD; Amendment
39-21151; AD 2020-13-06]
RIN 2120-AA64

Airworthiness Directives; Pratt & Whitney Canada Corp. Turboprop
Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain Pratt & Whitney Canada Corp. (P&WC) PW150A model turboprop
engines. This AD was prompted by a determination by the manufacturer
that certain PW150A engine high-pressure (HP) centrifugal impellers may
exhibit a material microstructure anomaly that has a potential to
adversely affect the low cycle fatigue characteristics of the part.
This AD requires replacement of the affected HP centrifugal impellers.
The FAA is issuing this AD to address the unsafe condition on these
products.

DATES: This AD is effective August 6, 2020.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of August 6,
2020.

ADDRESSES: For service information identified in this final rule,
contact Pratt & Whitney Canada Corp., 1000 Marie-Victorin, Longueuil,
Quebec, Canada, J4G 1A1; phone: 800-268-8000; fax: 450-647-2888;
internet: https://www.pwc.ca. You may view this service information at
the FAA, Airworthiness Products Section, Operational Safety Branch,
1200 District Avenue, Burlington, MA 01803. For information on the
availability of this material at the FAA, call 781-238-7759. It is also
available on the internet at https://www.regulations.gov by searching
for and locating Docket No. FAA-2019-0395.

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-2019-
0395; or in person at Docket Operations between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal holidays. The AD docket contains
this final rule, the mandatory continuing airworthiness information
(MCAI), any comments received, and other information. The address for
Docket Operations is U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Barbara Caufield, Aerospace Engineer,
ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone:
781-238-7146; fax: 781-238-7199; email: barbara.caufield@faa.gov.

SUPPLEMENTARY INFORMATION:

Discussion

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to certain P&WC PW150A
turboprop engines. The NPRM published in the Federal Register on June
24, 2019 (84 FR 29419). The NPRM was prompted by a determination by the
manufacturer that certain PW150A engine HP centrifugal impellers may
exhibit a material microstructure anomaly that has a potential to
adversely affect the low cycle fatigue characteristics of the part. The
NPRM proposed to require replacement of the affected HP centrifugal
impellers. The FAA is issuing this AD to address the unsafe condition
on these products.
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued AD CF-2018-12, dated April 27, 2018
(referred to after this as ``the MCAI''), to address the unsafe
condition on these products. The MCAI states:

Pratt & Whitney Canada (P&WC) has determined that certain PW150A
engine HP centrifugal impellers, part number (P/N) 3049127-01, may
exhibit a material microstructure anomaly which has a potential to
adversely affect the low cycle fatigue (LCF) characteristics of the
part, resulting in a lower LCF life than currently published in the
engine model's Airworthiness Limitations. The identified discrepancy
was related to specific parts having been exposed to inappropriate
temperature levels during the manufacturing process.
To address the subject potential material microstructure
problem, P&WC issued SB 35331 Initial Issue, dated 16 March 2016,
and then subsequently Revision 1, dated 3 May 2016, to recommend
replacement of specific impeller serial numbers prior to the parts
reaching the determined thresholds. Subsequent to the release of the
SB, P&WC voluntarily initiated a fleet campaign to achieve this
objective.
The actions specified by this [TCCA] AD are to ensure that HP
centrifugal impellers with this potential material anomaly condition
are contained in order to prevent severe engine damage and possible
aeroplane damage caused by an impeller failure.

You may obtain further information by examining the MCAI in the AD
docket on the internet at https://www.regulations.gov by searching for
and locating Docket No. FAA-2019-0395.

Comments

The FAA gave the public the opportunity to participate in
developing this final rule. The FAA received no comments on the NPRM or
on the determination of the cost to the public.

Conclusion

The FAA reviewed the relevant data and determined that air safety
and the public interest require adopting this final rule as proposed
except for minor editorial changes. The FAA has determined that these
minor changes:
Are consistent with the intent that was proposed in the
NPRM for addressing the unsafe condition; and
Do not add any additional burden upon the public than was
already proposed in the NPRM.

Related Service Information Under 1 CFR Part 51

The FAA reviewed P&WC Service Bulletin (SB) PW150-72-35331,
Revision No. 1, dated May 3, 2016. The SB describes procedures for the
replacement of the affected HP centrifugal impeller. 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.

Costs of Compliance

The FAA estimates that this AD affects 20 engines installed on
airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

Estimated Costs

Action
Labor cost
Parts cost
Cost per product
Cost on U.S. operators
Replace HP centrifugal impeller 100 work-hours x $85 per hour = $8,500 $201,921 $210,421 $4,208,420

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.
The FAA is 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

This AD will not have federalism implications under Executive Order
13132. This AD will 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.
For the reasons discussed above, I certify this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, and
(3) 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.

Adoption of the Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 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.

Sec. 39.13 [Amended]

2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive (AD):