DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2020-0818; Project Identifier MCAI-2020-00987-A]
Airworthiness Directives; Pilatus Aircraft Ltd.
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
SUMMARY: The FAA proposes to adopt a new airworthiness directive
for certain Pilatus Aircraft Ltd. (Pilatus) Model PC-24 airplanes. This
proposed 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 electrical harness
installations on PC-24 airplanes that are not in compliance with the
approved design. This unsafe condition could lead to wire chafing and
potential arcing or failure of wires having the incorrect length,
possibly resulting in loss of system redundancy, or generation of smoke
and smell, or loss of power plant fire protection function. The FAA is
proposing this AD to address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by November
ADDRESSES: You may send comments, using the procedures found in
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow
instructions for submitting comments.
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 NPRM, contact
Pilatus Aircraft Ltd., CH-6371, Stans, Switzerland; telephone: +41 848
24 7 365; email: email@example.com; internet: 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. It is also available on
the internet at https://www.regulations.gov by searching for and
locating Docket No. FAA-2020-0818.
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-2020-0818;
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 NPRM, the MCAI, any comments received, and other information. The
street address for Docket Operations is listed above. Comments will be
available in the AD docket shortly after receipt.
FOR FURTHER INFORMATION CONTACT: Doug Rudolph, Aerospace Engineer,
General Aviation & Rotorcraft Section, International Validation Branch,
901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816)
329-4059; fax: (816) 329-4090; email: firstname.lastname@example.org.
The FAA invites 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-2020-0818;
Project Identifier MCAI-2020-00987-A" at the beginning of your
comments. The FAA will consider all comments received by the closing
date and may amend this proposed AD because of those comments.
Except for Confidential Business Information (CBI) as described in
the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
https://www.regulations.gov, including any personal information you
provide. The FAA will also post a report summarizing each substantive
verbal contact it receives about this proposed AD.
Confidential Business Information
Confidential Business Information (CBI) is commercial or financial
information that is both customarily and actually treated as private by
its owner. Under the Freedom of Information Act (FOIA) (5 U.S.C. 552),
CBI is exempt from public disclosure. If your comments responsive to
this NPRM contain commercial or financial information that is
customarily treated as private, that you actually treat as private, and
that is relevant or responsive to this NPRM, it is important that you
clearly designate the submitted comments as CBI. Please mark each page
of your submission containing CBI as "PROPIN." The FAA will treat
such marked submissions as confidential under the FOIA, and they will
not be placed in the public docket of this NPRM. Submissions containing
CBI should be sent to Doug Rudolph, Aerospace Engineer, FAA, General
Aviation & Rotorcraft Section, International Validation Branch, 901
Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329-
4059; fax: (816) 329-4090; email: email@example.com. Any commentary
that the FAA receives which is not specifically designated as CBI will
be placed in the public docket for this rulemaking.
The European Union Aviation Safety Agency (EASA), which is the
Technical Agent for the Member States of the European Union Community,
has issued EASA AD No. 2020-0158, dated July 16, 2020 (referred to
after this as "the MCAI"), to address an unsafe condition on certain
Pilatus Aircraft Ltd. (Pilatus) Model PC-24 airplanes. The MCAI states:
During production, electrical harness installations on some PC-
24 aeroplanes were found not to comply with the approved design.
This condition, if not corrected, could lead to wire chafing and
potential arcing, or to failure of wires having the incorrect
length, possibly resulting in loss of system redundancy, or
generation of smoke and smell, or loss of power plant fire
To address this potential unsafe condition, Pilatus issued the
[service bulletin] SB, providing instructions to improve the
electrical harness installations in the nose bay, cockpit, fuselage,
wing fairing and rear fuselage areas.
For the reason described above, this [EASA] AD requires
modification of the electrical harness installations.
The incorrect length wires are too short in length and do not have
appropriate slack, which could lead to wires being pulled loose from
the terminals during flight or ground operation. Generation of smell
refers to the smell from electrical arcing.
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-2020-0818.
Related Service Information Under 1 CFR Part 51
The FAA reviewed Pilatus PC-24 Service Bulletin No. 91-001, dated
April 7, 2020. The service information specifies procedures necessary
to improve the electrical harness installation in the nose bay,
cockpit, avionics rack, fuselage, wing fairing, and rear fuselage. 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.
FAA's Determination and Requirements of the Proposed AD
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 is proposing this AD
because the FAA evaluated all information and determined the unsafe
condition exists and is likely to exist or develop on other products of
the same type design.
Costs of Compliance
The FAA estimates that this proposed AD would affect
[Lt]Number_of_Aircraft[Gt] products of U.S. registry. The FAA also
estimates that it would take 20 work-hours per product to comply with
the requirements of this proposed AD. The average labor rate is $85 per
work-hour. Required parts would cost about [Lt]Inspect_Parts[Gt] per
Based on these figures, the FAA estimates the cost of the proposed
AD on U.S. operators would be [Lt]Fleet_Cost[Gt], or $1,775 per
According to the manufacturer, some of the costs of this AD may be
covered under warranty, thereby reducing the cost impact on affected
individuals. The FAA does not control warranty coverage for affected
individuals. As a result, the FAA has included all costs in this cost
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.
The FAA 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.
For the reasons discussed above, I certify this proposed
(1) Is not a "significant regulatory action" under Executive
(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
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.
Sec. 39.13 [Amended]
2. The FAA amends Sec. 39.13 by adding the following new airworthiness