DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2023-1398; Project Identifier AD-2023-00472-P;
Amendment 39-22525; AD 2023-16-06]
Airworthiness Directives; Hamilton Sundstrand Corporation
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
SUMMARY: The FAA is adopting a new airworthiness directive (AD)
Hamilton Sundstrand Corporation (Hamilton Sundstrand) Model 14SF-17 and
14SF-19 propellers. This AD was prompted by a report of an auxiliary
motor and pump failing to feather a propeller in flight. This AD
requires replacement of a certain auxiliary motor and pump. This AD
also prohibits installation of a certain auxiliary motor and pump on
any propeller. The FAA is issuing this AD to address the unsafe
condition on these products.
DATES: This AD is effective October 20, 2023.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of October 20,
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2023-1398; 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.
Material Incorporated by Reference:
For service information identified in this final rule,
contact Hamilton Sundstrand, One Hamilton Road, Windsor Locks, CT
06096; phone: (877) 808-7575; email: CRC@collins.com.
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. It is
also available at regulations.gov under Docket No. FAA-2023-1398.
FOR FURTHER INFORMATION CONTACT: Isabel Saltzman, Aviation Safety
Engineer, FAA, 1701 Columbia Avenue, College Park, GA 30337; phone:
(781) 238-7649; email: 9-AVS-AIR-BACO-COS@faa.gov.
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to all Hamilton Sundstrand
Model 14SF-17 and 14SF-19 propellers. The NPRM published in the Federal
Register on June 27, 2023 (88 FR 41513). The NPRM was prompted by a
report of an auxiliary motor and pump installed on a non-Hamilton
Sundstrand propeller failing to feather the propeller in flight through
either the primary or the backup means. The failure was caused by motor
magnets in the auxiliary motor and pump that were de-bonded due to
corrosion at the magnet and housing interface. The de-bonded motor
magnets prevented motor rotation. Hamilton Sundstrand Model 14SF-17 and
14SF-19 propellers use the same auxiliary motor and pump. These
propellers are installed on, but not limited to, Viking Air Limited
(type certificate previously held by Bombardier Inc.; Canadair Limited)
Model CL-215-6B11 (CL-215T & CL-415 Variants) airplanes. In the NPRM,
the FAA proposed to require the removal from service of an auxiliary
motor and pump having part number (P/N) 782655-3 (Aerocontrolex P/N
4122-006009) and replacement with an auxiliary motor and pump having P/
N 782655-4 (Aerocontrolex P/N 4122-056000). In the NPRM, the FAA also
proposed to prohibit installation of an auxiliary motor and pump having
P/N 782655-3 (Aerocontrolex P/N 4122-006009) on any propeller. The FAA
is issuing this AD to address the unsafe condition on these products.
Discussion of Final Airworthiness Directive
The FAA received no comments on the NPRM or on the determination of
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. Except for
minor editorial changes, this AD is adopted as proposed in the NPRM.
Related Service Information Under 1 CFR Part 51
The FAA reviewed Hamilton Sundstrand Corporation Service Bulletin
(SB) 14SF-61-168, Revision 1, dated December 21, 2016. This service
information specifies instructions for replacing the auxiliary motor
and pump. Hamilton Sundstrand Corporation is a UTC Aerospace Systems
Company. This service information is identified as both Hamilton
Sundstrand Corporation and UTC Aerospace Systems. 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.
Costs of Compliance
The FAA estimates that this AD affects 20 propellers installed on
airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:
|Replace auxiliary motor and pump
||2 work-hours x $85 per hour =
|Perform post-installation system
||1 work-hour x $85 per hour =
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.
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
(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
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