Rule2022-28091
Airworthiness Directives; Pratt & Whitney Turbofan Engines
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
December 27, 2022
Effective
January 31, 2023
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is adopting a new airworthiness directive (AD) for all Pratt & Whitney (PW) PW1519G, PW1521G, PW1521G-3, PW1521GA, PW1524G, PW1524G-3, PW1525G, and PW1525G-3 model turbofan engines. This AD was prompted by an uncommanded dual engine shutdown upon landing, resulting in compromised braking capability due to the loss of engine power and hydraulic systems. This AD requires removal from service of certain electronic engine control (EEC) full authority digital engine control (FADEC) software versions and replacement with updated software. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 87 Issue 247 (Tuesday, December 27, 2022)</title>
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[Federal Register Volume 87, Number 247 (Tuesday, December 27, 2022)]
[Rules and Regulations]
[Pages 79235-79236]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2022-28091]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2022-1306; Project Identifier AD-2022-01040-E;
Amendment 39-22289; AD 2022-27-04]
RIN 2120-AA64
Airworthiness Directives; Pratt & Whitney Turbofan Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all
Pratt & Whitney (PW) PW1519G, PW1521G, PW1521G-3, PW1521GA, PW1524G,
PW1524G-3, PW1525G, and PW1525G-3 model turbofan engines. This AD was
prompted by an uncommanded dual engine shutdown upon landing, resulting
in compromised braking capability due to the loss of engine power and
hydraulic systems. This AD requires removal from service of certain
electronic engine control (EEC) full authority digital engine control
(FADEC) software versions and replacement with updated software. The
FAA is issuing this AD to address the unsafe condition on these
products.
DATES: This AD is effective January 31, 2023.
ADDRESSES: AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a>
by searching for and locating Docket No. FAA-2022-1306; 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: Mark Taylor, Aviation Safety Engineer,
ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone:
(781) 238-7229; email: <a href="/cdn-cgi/l/email-protection#e2af839089ccb6839b8e8d90a2848383cc858d94"><span class="__cf_email__" data-cfemail="96dbf7e4fdb8c2f7effaf9e4d6f0f7f7b8f1f9e0">[email protected]</span></a>.
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 PW PW1519G,
PW1521G, PW1521G-3, PW1521GA, PW1524G, PW1524G-3, PW1525G, and PW1525G-
3 model turbofan engines. The NPRM published in the Federal Register on
October 25, 2022 (87 FR 64397). The NPRM was prompted by a report that
an airplane experienced an uncommanded dual engine shutdown upon
landing, resulting in compromised braking capability due to the loss of
engine power and hydraulic systems. A subsequent investigation
determined that the sequence of the auto-throttle increasing throttle
to maintain Mach number, immediately followed by pilot command to
decrease throttle to idle, caused a transient disagreement between
actual and commanded thrust. This disagreement triggered the thrust
control malfunction (TCM) detection logic and resulted in dual engine
shutdown once the weight on wheels signal was activated upon landing.
The installed EEC FADEC software version latches the fault and allows
the engine to continue operation as commanded but shuts down the engine
upon landing. The manufacturer identified the situations that could
trigger the TCM logic erroneously and updated the EEC FADEC software.
This software update makes corrective improvements to the TCM logic,
including revised criteria for triggering the TCM logic and
establishing criteria that permit the TCM logic to unlatch during
flight. In the NPRM, the FAA proposed to require removal from service
of certain EEC FADEC software versions and replacement with a software
version 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 one comment, from Air Line Pilots Association,
International (ALPA). ALPA supported the NPRM without change.
Conclusion
The FAA reviewed the relevant data, considered the comments
received, and determined that air safety requires adopting the AD as
proposed. Accordingly, the FAA is issuing this AD to address the unsafe
condition on these products. Except for minor editorial changes, this
AD is adopted as proposed in the NPRM.
Related Service Information
The FAA reviewed PW Service Bulletin (SB) PW1000G-A-73-00-0054-00A-
930A-D, Issue No. 002, dated June 20, 2022. This service information
specifies procedures for replacing or modifying the EEC to incorporate
FADEC software version V2.11.14.
Costs of Compliance
The FAA estimates that this AD affects 147 engines installed on
airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:
[[Page 79236]]
Estimated Costs
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Cost per Cost on U.S.
Action Labor cost Parts cost product operators
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Upgrade EEC FADEC Software............ 2 work-hours x $85 per $0 $170 $24,990
hour = $170.
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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
0
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]
0
2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive:
2022-27-04 Pratt & Whitney: Amendment 39-22289; Docket No. FAA-2022-
1306; Project Identifier AD-2022-01040-E.
(a) Effective Date
This airworthiness directive (AD) is effective January 31, 2023.
(b) Affected ADs
None.
(c) Applicability
This AD applies to Pratt & Whitney PW1519G, PW1521G, PW1521G-3,
PW1521GA, PW1524G, PW1524G-3, PW1525G, and PW1525G-3 model turbofan
engines.
(d) Subject
Joint Aircraft System Component (JASC) Code 7600, Engine
Controls.
(e) Unsafe Condition
This AD was prompted by an uncommanded dual engine shutdown upon
landing, resulting in compromised braking capability due to the loss
of engine power and hydraulic systems. The FAA is issuing this AD to
prevent compromised braking capability due to uncommanded dual
engine shutdown upon landing. The unsafe condition, if not
addressed, could result in runway excursion.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
For affected engines with installed electronic engine control
(EEC) full authority digital engine control (FADEC) software version
earlier than V2.11.14.1, within 12 months after the effective date
of this AD, remove the EEC FADEC software and replace with an EEC
FADEC software version eligible for installation.
(h) Definitions
For the purpose of this AD, ``EEC FADEC software version
eligible for installation'' is EEC FADEC software version V2.11.14.1
or later.
(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
certification office, send it to the attention of the person
identified in paragraph (j) of this AD and email to: <a href="/cdn-cgi/l/email-protection#abeae5ee86eaef86eae6e4e8ebcdcaca85ccc4dd"><span class="__cf_email__" data-cfemail="0849464d25494c254945474b486e6969266f677e">[email protected]</span></a>.
(2) 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.
(j) Related Information
For more information about this AD, contact Mark Taylor,
Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue,
Burlington, MA 01803; phone: (781) 238-7229; email:
<a href="/cdn-cgi/l/email-protection#460b27342d6812273f2a29340620272768212930"><span class="__cf_email__" data-cfemail="d994b8abb2f78db8a0b5b6ab99bfb8b8f7beb6af">[email protected]</span></a>.
(k) Material Incorporated by Reference
None.
Issued on December 20, 2022.
Christina Underwood,
Acting Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2022-28091 Filed 12-23-22; 8:45 am]
BILLING CODE 4910-13-P
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