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2022-13-15 WILLIAMS INTERNATIONAL CO., L.L.C.: Amendment 39-22101; Docket No. FAA-2021-0511; Project Identifier AD-2020-01229-E.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective August 9, 2022.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to Williams International Co., L.L.C. (Williams) FJ44-
    2A, FJ44-2C, FJ44-3A,  and FJ44-3A-24 model turbofan engines  with  an
    engine serial number  identified  in paragraph 1.A.,  Effectivity,  of
    Williams  International  Service  Bulletin  WISB-72-1032,  Revision 2,
    dated June 4, 2020 (the SB),  with an installed  high-pressure turbine
    (HPT) disk, part number (P/N) 67093.

(d) SUBJECT

    Joint Aircraft System Component (JASC) Code 7250, Turbine Section.

(e) UNSAFE CONDITION

    This AD was prompted by a report  of cracks in the HPT disk posts  and
    failure of an HPT disk post, resulting in the contained fracture of an
    HPT  disk  post and  blade.  The FAA  is  issuing this  AD  to prevent
    cracking and failure of the  HPT disk posts. The unsafe  condition, if
    not addressed, could result in release of the HPT blade, 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

(1) For FJ44-2A and FJ44-2C model turbofan engines,  within the compliance
    times specified  in Table 1 to Paragraph (g)  of this AD,  remove  the
    affected HPT disk from service and replace it with a part eligible for
    installation using paragraphs 2.C. and E., Accomplishment Instructions
    -FJ44-2A & FJ44-2C, of the SB.

(2) For FJ44-3A and FJ44-3A-24 model turbofan engines,  within the compli-
    ance times specified  in Table 1 to Paragraph (g)  of this AD,  remove
    the affected HPT disk from service and replace it with a part eligible
    for installation using paragraphs 3.C. and D., of the SB.

                    TABLE 1 TO PARAGRAPH (G)  COMPLIANCE TIME            
    ______________________________________________________________________
    HPT DISK, P/N 67093, CYCLES                 REPLACE WITHIN HPT DISK
    SINCE NEW (CSN) AS OF THE                   CYCLES AFTER THE EFFECTIVE
    EFFECTIVE DATE OF THIS AD                   DATE OF THIS AD
    ______________________________________________________________________
    0 to 999 CSN                                          620
    1,000 to 1,999 CSN                                    530
    2,000 to 2,999 CSN                                    245
    3,000 or higher CSN                                   130
    ______________________________________________________________________

(h) INSTALLATION PROHIBITION

    After the effective date of this AD, do not install onto any engine an
    HPT disk with P/N 67093.

(i) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The Manager, Chicago ACO, 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  certification
    office, send it to the attention of the person identified in paragraph
    (j) of this AD.

(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

    For more information about this AD, contact Kyle Bush, Aviation Safety
    Engineer, Chicago ACO,  FAA,  2300 East Devon Avenue,  Des Plaines, IL
    60018; phone: (847) 294-7870; email: kyle.bush@faa.gov.

(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) Williams International Service Bulletin WISB-72-1032 Revision 2, dated
    June 4, 2020.

(ii) [Reserved]

(3) For service information identified in this AD, contact Williams Inter-
    national, Product Support, 2000 Centerpoint Parkway, Pontiac, MI 48341
    phone: (800) 859-3544;  website:  http://www.williams-int.com/product-
    support.

(4) You may view this service information at FAA,  Airworthiness  Products
    Section, Operational Safety Branch FAA, 1200 District Avenue, Burling-
    ton, MA 01803. For information on the availability of this material at
    the FAA, call (817) 222-5110.

(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: fr.
    inspection@nara.gov,   or   go  to:  https://www.archives.gov/federal-
    register/cfr/ibr-locations.html.

Issued on June 17, 2022.  Christina Underwood, Acting Director, Compliance
& Airworthiness Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT: Kyle Bush, Aviation Safety Engineer, Chi-
cago ACO, FAA, 2300 East Devon Avenue, Des Plaines, IL 60018; phone: (847)
294-7870; email: kyle.bush@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0511; Project Identifier AD-2020-01229-E;
Amendment 39-22101; AD 2022-13-15]
RIN 2120-AA64

Airworthiness Directives; Williams International Co., L.L.C.
Turbofan Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain Williams International Co., L.L.C. (Williams) FJ44-2A, FJ44-2C,
FJ44-3A, and FJ44-3A-24 model turbofan engines. This AD was prompted by
a report of cracks in the high-pressure turbine (HPT) disk posts and
failure of an HPT disk post, resulting in the contained fracture of an
HPT disk post and blade. This AD requires removing the HPT disk, part
number (P/N) 67093, from service before reaching defined cycle limits
and replacing it with a part eligible for installation. The FAA is
issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective August 9, 2022.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of August 9,
2022.

ADDRESSES: For service information identified in this final rule,
contact Williams International, Product Support, 2000 Centerpoint
Parkway, Pontiac, MI 48341; phone: (800) 859-3544; website: http://
www.williams-int.com/product-support. 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 (817)
222-5110.

Examining the AD Docket

You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2021-0511; 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, 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: Kyle Bush, Aviation Safety Engineer,
Chicago ACO, FAA, 2300 East Devon Avenue, Des Plaines, IL 60018; phone:
(847) 294-7870; email: kyle.bush@faa.gov.

SUPPLEMENTARY INFORMATION:

Background

The FAA issued a supplemental notice of proposed rulemaking (SNPRM)
to amend 14 CFR part 39 by adding an AD that would apply to certain
Williams FJ44-2A, FJ44-2C, FJ44-3A, and FJ44-3A-24 model turbofan
engines. The SNPRM published in the Federal Register on April 14, 2022
(87 FR 22153). The SNPRM was prompted by a report of cracks in the HPT
disk posts and failure of an HPT disk post, resulting in the contained
fracture of an HPT disk post and blade. Subsequently, Williams notified
the FAA that revised service information was available, which added
additional serial-numbered FJ44-2A, FJ44-2C, and FJ44-3A model turbofan
engines to the effectivity and updated the compliance time for
replacing the HPT disk. In the SNPRM, the FAA proposed to require
removing the HPT disk, P/N 67093, from service before reaching defined
cycle limits and replacing it with a part eligible for installation.
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 SNPRM or on the determination
of the costs.

Conclusion

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 SNPRM.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Williams International Service Bulletin (SB) WISB-
72-1032, Revision 2, dated June 4, 2020. This SB specifies procedures
for removing and replacing the HPT rotor assemblies that include HPT
disk, P/N 67093. This SB also provides instructions for incorporating
the latest HPT combustor/fuel slinger module on FJ44-2A and FJ44-2C
model turbofan engines. 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
ADDRESSES.

Other Related Service Information


The FAA reviewed Williams International SB WISB-72-1034, Revision
3, dated July 2, 2021. This SB describes procedures for re-identifying
the HPT rotor assembly and HPT disk.

Costs of Compliance

The FAA estimates that this AD affects 242 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
Remove and replace the HPT disk 33 work-hours x $85 per hour = $2,805
$16,694
$19,499
$4,718,758

The FAA has included all known costs in its 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 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 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 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: