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2021-10-28 PILATUS AIRCRAFT LTD.: Amendment 39-21561; Docket No. FAA-2020-0812; Project Identifier MCAI-2020-01317-A.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective July 15, 2021.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD  applies  to  Pilatus Aircraft Ltd. Model PC-24 airplanes, all
    serial numbers, certificated in any category.

(d) SUBJECT

    Joint Aircraft System Component (JASC)  Code 2740:  Stabilizer Control
    System.

(e) REASON

    This AD was prompted  by the need  to revise the Airworthiness Limita-
    tions section (ALS) of the existing aircraft maintenance manual  (AMM)
    to add new and more restrictive tasks for the control column  sprocket
    gear assembly and  control wheel column  assembly, to address  the new
    limit of validity and update the usage assumptions and conditions  for
    operations on unpaved  and grass runways,  and to correct  an error in
    the horizontal stabilizer primary  trim system secondary power  source
    operational test. The FAA is  issuing this AD to prevent  reduction in
    the structural integrity of the airframe and components, as well as an
    unrecognized failure of  the manual pitch  trim. These conditions,  if
    not addressed, could result in loss of airplane control.

(f) ACTIONS AND COMPLIANCE

(1) Before further flight,  unless already done,  revise  the  ALS  of the
    existing AMM  or instructions  for continued  airworthiness (ICA)  for
    your airplane by incorporating the following documents.

(i) Airworthiness Limitations, AMM data module PC24-A-A04-00-0000-00A040A-
    A, Issue 008, Revision 00, dated May 26, 2020,  from Chapter 04,  Air-
    worthiness Limitations, Pilatus PC-24 Aircraft Maintenance Manual (PC-
    24 AMM) Report 02378, Issue 005, Revision 19, dated May 26, 2020.

(ii) Mandatory structural inspection items, AMM data module PC24-A-A04-20-
     0000-00A-000A-A, Issue 005,  Revision 00,  dated  May 26, 2020,  from
     Chapter 04, Airworthiness Limitations, Pilatus PC-24 Aircraft Mainte-
     nance Manual (PC-24 AMM) Report 02378, Issue 005, Revision 19,  dated
     May 26, 2020.

(iii) Certification maintenance requirements,  AMM data module PC24-A-A04-
      30-0000-00A-000A-A, Issue 007,  Revision 00, dated October 14, 2019,
      from Chapter 04,  Airworthiness Limitations,  Pilatus PC-24 Aircraft
      Maintenance Manual (PC-24 AMM) Report 02378, Issue 005, Revision 19,
      dated May 26, 2020.

(iv) Horizontal stabilizer  primary  trim  system secondary power source -
     Operation test, AMM data module PC24-A-E27-40-0000-01A-320A-A,  dated
     September 25, 2019, from PC-24 AMM Report 02378, Issue 005,  Revision
     19, dated May 26, 2020. Your ALS must require this procedure for task
     number AL-27-40-022 in the certification maintenance requirements.

Note 1 to paragraph (f)(1) of this AD:  Pilatus PC-24 Aircraft Maintenance
Manual,  Airworthiness  Limitations,  AMM  data module PC24-A-A04-00-0000-
00A040A-A, Issue 008, Revision 00, dated May 26, 2020,  is the parent data
module for Chapter 04 of the PC-24 AMM  and  consists  of four subsections
(sub-data modules).  The parent data module and four sub-data modules com-
prise the complete ALS of Chapter 04,  Airworthiness Limitations,  Pilatus
PC-24 Aircraft Maintenance Manual  (PC-24 AMM)  Report  02378,  Issue 005,
Revision 19,  dated  May 26, 2020.  Incorporating  Pilatus  PC-24 Aircraft
Maintenance Manual, Airworthiness Limitations,  AMM data module PC24-AA04-
00-0000-00A-040A-A, Issue 008 Revision 00, dated May 26, 2020 and all four
subsections listed in Section 1 General, is acceptable,  but not required,
for compliance with this AD.

(2) As of the effective date of this AD,  except as provided  in paragraph
    (g) of this AD, no alternative replacement times, inspection intervals
    or tasks may be approved for the affected parts.

(3) The actions required by paragraph (f)(1) of this AD  may  be performed
    by  the  owner/operator  (pilot)  holding  at  least  a  private pilot
    certificate  and must  be entered  into the  aircraft records  showing
    compliance with this AD in  accordance with 14 CFR 43.9(a)(1)  through
    (4), and  14 CFR  91.417(a)(2)(v). The  record must  be maintained  as
    required by 14 CFR 91.417, 121.380, or 135.439.

(g) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

    The Manager, International Validation Branch,  FAA,  has the authority
    to approve AMOCs for this AD, if requested using the procedures  found
    in 14  CFR 39.19.  Send information  to Doug  Rudolph, Aviation Safety
    Engineer, FAA,  General Aviation  & Rotorcraft  Section, International
    Validation Branch, 901 Locust, Room 301, Kansas City, MO 64106; phone:
    (816)  329-4059;  fax:  (816)  329-4090;  email: doug.rudolph@faa.gov.
    Before  using any  approved AMOC  on any  airplane to  which the  AMOC
    applies, notify your appropriate  principal inspector (PI) in  the FAA
    Flight Standards District Office (FSDO),  or lacking a PI, your  local
    FSDO.  Before  using  any  approved  AMOC,  notify  your   appropriate
    principal inspector, or lacking a principal inspector, the manager  of
    the  local  flight   standards  district  office/certificate   holding
    district office.

(h) RELATED INFORMATION

    Refer  to  European Union Aviation Safety Agency  (EASA) AD 2020-0202,
    dated September 22, 2020, for more information.  You  may  examine the
    EASA AD at https://www.regulations.gov by searching for  and  locating
    Docket No. FAA-2020-0812.

(i) MATERIAL INCORPORATED BY REFERENCE

(1) The Director of the Federal Register  approved  the  incorporation  by
    reference 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) Chapter 04, Airworthiness Limitations,  Pilatus PC-24 Aircraft Mainte-
    nance Manual (PC-24 AMM) Report 02378,  Issue 005,  Revision 19, dated
    May 26, 2020.

(ii) Horizontal  stabilizer  primary  trim system secondary power source -
     Operation test, AMM data module PC24-A-E27-40-0000-01A-320A-A,  dated
     September 25, 2019, from PC-24 AMM Report 02378,  Issue 005, Revision
     19, dated May 26, 2020.

(3) For Pilatus Aircraft Ltd.  service information  identified in this AD,
    contact Pilatus Aircraft Ltd.,  Customer Support General Aviation, CH-
    6371 Stans, Switzerland;  phone: +41 848 24 7 365; email: techsupport.
    ch@pilatus-aircraft.com; website: https://www.pilatus-aircraft.com.

(4) You may view this service information at FAA,  Airworthiness  Products
    Section, Operational Safety Branch, 901 Locust, Kansas City, MO 64106.
    For information on the availability of this material at the FAA,  call
    (816) 329-4148.

(5) You may view this service information  that is incorporated  by refer-
    ence 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 May 7, 2021. Gaetano A. Sciortino, Deputy Director for Strategic
Initiatives,  Compliance & Airworthiness Division,  Aircraft Certification
Service.

FOR FURTHER INFORMATION CONTACT:  Doug Rudolph,  Aviation Safety Engineer,
FAA General Aviation & Rotorcraft Section, International Validation Branch
901 Locust, Room 301, Kansas City, MO 64106;  phone: (816) 329-4059;  fax:
(816) 329-4090; email: doug.rudolph@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2020-0812; Project Identifier MCAI-2020-01317-A;
Amendment 39-21561; AD 2021-10-28]
RIN 2120-AA64

Airworthiness Directives
; Pilatus Aircraft Ltd. Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all
Pilatus Aircraft Ltd. (Pilatus) Model PC-24 airplanes. This AD results
from mandatory continuing airworthiness information (MCAI) originated
by an aviation authority of another country to identify and correct an
unsafe condition on an aviation product. The MCAI identifies the unsafe condition
as the need to revise certain airworthiness limitations and certification
maintenance instructions. The FAA is issuing this AD to address the
unsafe condition on these products.

DATES: This AD is effective July 15, 2021.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of July 15,
2021.

ADDRESSES: For service information identified in this final rule,
contact Pilatus Aircraft Ltd., Customer Support General Aviation, CH-
6371 Stans, Switzerland; phone: +41 848 24 7 365; email:
techsupport.ch@pilatus-aircraft.com; website: https://www.pilatus-
aircraft.com. You may view this service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 901 Locust,
Kansas City, MO 64106. For information on the availability of this
material at the FAA, call (816) 329-4148.

Examining the AD Docket

You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2020-0812; 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
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: Doug Rudolph, Aviation Safety
Engineer, FAA, General Aviation & Rotorcraft Section, International
Validation Branch, 901 Locust, Room 301, Kansas City, MO 64106; phone:
(816) 329-4059; fax: (816) 329-4090; email: doug.rudolph@faa.gov.

SUPPLEMENTARY INFORMATION:

Background

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to all Pilatus Model PC-24
airplanes. The NPRM published in the Federal Register on March 11, 2021
(86 FR 13838). The NPRM was based on MCAI from the European Union
Aviation Safety Agency (EASA), which is the Technical Agent for the
Member States of the European Union. EASA issued AD 2020-0202, dated
September 22, 2020 (referred to after this as ``the MCAI'') to correct
an unsafe condition for Pilatus Model PC-24 airplanes. The MCAI states:

The airworthiness limitations and certification maintenance
instructions for Pilatus PC-24 aeroplanes, which are approved by
EASA, are currently defined and published in Pilatus PC-24 AMM
[Aircraft Maintenance Manual] Chapter 04-00-00. These instructions
have been identified as mandatory for continued airworthiness.
Failure to accomplish these instructions could result in an
unsafe condition.
Previously, EASA issued AD 2020-0074, [dated March 27, 2020,]
requiring the actions described in the Pilatus PC-24 AMM Chapter 04-
00-00, Document Number 02378 Issue 005 at Revision 14.
Since that AD was issued, Pilatus published the ALS
[Airworthiness Limitations section, at Issue 005 Revision 19], which
contains the following new and/or more restrictive tasks as
specified in Mandatory Structural Inspection Items data module PC24-
AA04-20-0000-00A-000A-A Issue 005 Revision 00:

--AL-27-00-025 and AL-27-00-026: Control column sprocket gear
assembly, and
--AL-27-00-027: Control wheel column assembly.

In addition, Airworthiness Limitations Description data module
PC24-A-A04-00-0000-00A-040A-A Issue 008 Revision 00 includes:

--The new limit of validity following the completion of the Full
Scale Fatigue Test, and
--Usage assumptions/conditions for operations on unpaved and grass
runaways.

EASA AD 2020-0074, dated March 27, 2020, required revising the
Airworthiness Limitations section (ALS) to correct an error in the
horizontal stabilizer primary trim system secondary power source
operational test. The MCAI retains the requirements of EASA AD 2020-
0074, dated March 27, 2020, which the MCAI supersedes, and requires the
additional revisions discussed previously. You may examine the MCAI in
the AD docket at https://www.regulations.gov by searching for and
locating Docket No. FAA-2020-0812.
In the NPRM, the FAA proposed to require replacing the revised
sections of the ALS described previously into the existing AMM or
instructions for continued airworthiness. The FAA is issuing this AD to
address the unsafe condition on these products.

Discussion of Final Airworthiness Directive

Comments

The FAA received no comments on the NPRM or on the determination of
the costs.

Conclusion

This product has been approved by the aviation authority of another
country and is approved for operation in the United States. Pursuant to
our bilateral agreement with this State of Design Authority, it has
notified the FAA of the unsafe condition described in the MCAI and
service information referenced above. The FAA reviewed the relevant
data and determined that air safety requires adopting this AD as
proposed. Accordingly, the FAA is issuing this AD to address the unsafe
condition on these products. This AD is adopted as proposed in the
NPRM.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Chapter 04, Airworthiness Limitations, Pilatus PC-
24 Aircraft Maintenance Manual (PC-24 AMM) Report 02378, Issue 005,
Revision 19, dated May 26, 2020. This service information contains the
parent data module and the new limit of validity and updates the usage
assumptions and conditions for operations on unpaved and grass runways.
This document also contains the revised subsections with revised
maintenance actions.
The FAA also reviewed Horizontal stabilizer primary trim system
secondary power source--Operation test, data module PC24-A-E27-40-0000-
01A-320A-A, dated September 25, 2019, from PC-24 AMM Report 02378,
Issue 005, Revision 19, dated May 26, 2020. This service information
contains revised procedures for task number AL-27-40-022 in the
certification maintenance requirements.
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.

Costs of Compliance

The FAA estimates that this AD will affect 42 products of U.S.
registry. The FAA also estimates that it will take about 1 work-hour
per product to comply with the requirements of this proposed AD. The
average labor rate is $85 per work-hour.
Based on these figures, the FAA estimates the cost of this AD on
U.S. operators will be $3,570 or $85 per product.

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 have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.
(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.

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: