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Federal Register / Vol. 86, No. 34 / Tuesday, February 23, 2021 / Rules and Regulations as they do not have a permanent P/N
marked on the actual part. The new filters in the modification kit do have a permanent marking on the frame of the actual part.
Costs of Compliance The FAA estimates that this AD will affect 36 airplanes of U.S. registry. The FAA also estimates that it would take 2.5 work-hours per product to comply with the requirements of this AD. The average labor rate is $85 per work-hour.
Required parts would cost about $575
per product, if all 4 filters would need to be replaced.
Based on these figures, the FAA
estimates the cost of this AD on U.S.
operators to be $28,350, or $787.50 per product.
The FAA has included all costs in this cost estimate. According to the manufacturer, however, some of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs 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 Agencys 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 that 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.
The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

10737

a Effective Date This airworthiness directive AD is effective March 30, 2021.
b Affected ADs None.
c Applicability This AD applies to Pilatus Aircraft Ltd.
Model PC24 airplanes, all serial numbers, certificated in any category, with any of the following evaporator filter assemblies installed, or if the part number P/N of the evaporator filter assembly is unknown:
1 Cockpit filter assembly P/N
959.90.20.291 PC24EC60681;
2 Cabin front filter assembly P/N
959.90.20.290 PC24EC62871;
3 Cabin bottom filter assembly P/N
959.90.20.288 PC24EC62881; or 4 Cabin top filter assembly P/N
959.90.20.289 PC24EC62971.
Note 1 to paragraph c: The P/N in parenthesis is an alternative vendor P/N.
d Subject Joint Aircraft System Component JASC
Code 2100, AIR CONDITIONING SYSTEM.
e Unsafe Condition This AD was prompted by a reported occurrence where, during production, cockpit and cabin evaporator filters produced with degraded fire retardant properties were installed on some Model PC24 airplanes.
The FAA is issuing this AD to detect improper cockpit and cabin evaporator filters installed on Model PC24 airplanes. The unsafe condition, if not addressed, could result in filters with degraded fire retardant properties, resulting in smoke in the cockpit and cabin in the event of electrical heater over-temperature.
f Actions and Compliance
Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20210403 Pilatus Aircraft Ltd.:
Amendment 3921424; Docket No.
FAA20200885; Project Identifier MCAI202000997A.

1 Within 4 months after the effective date of this AD, unless already done, remove each filter assembly from service and replace with a filter assembly as specified in table 1 to paragraph f1 of this AD by following the Accomplishment Instructions, sections 3A.
through 3C., of Pilatus PC24 Service Bulletin No. 21006, dated April 3, 2020.

TABLE 1 TO PARAGRAPH f1EVAPORATOR FILTER ASSEMBLIES
Item
Remove filter P/N

Cockpit filter assembly
Cabin front filter assembly
Cabin bottom filter assembly
Cabin top filter assembly

2 As of the effective date of this AD, do not install an evaporator filter assembly with a P/N listed in paragraph c of this AD on any airplane.
g Alternative Methods of Compliance AMOCs The Manager, General Aviation &
Rotorcraft Section, International Validation
VerDate Sep<11>2014

21:28 Feb 22, 2021

Jkt 253001

P/N
P/N
P/N
P/N

959.90.20.291
959.90.20.290
959.90.20.288
959.90.20.289

or or or or
Replace with filter P/N

PC24EC60681
PC24EC62871
PC24EC62881
PC24EC62971

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, Missouri 64106; phone: 816 3294059; fax:
816 3294090; email: doug.rudolph@

PO 00000

Frm 00035

Fmt 4700

Sfmt 4700

P/N
P/N
P/N
P/N

959.90.20.303
959.90.20.304
959.90.20.305
959.90.20.306

or or or or
PC24EC60685.
PC24EC62875.
PC24EC62885.
PC24EC62975.

faa.gov. 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 No. 20200160, dated
E:FRFM23FER1.SGM

23FER1