Rule2022-23716
Airworthiness Directives; Hoffmann GmbH & Co. KG Propellers
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
November 1, 2022
Effective
December 6, 2022
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is superseding Airworthiness Directive (AD) 2021-23-17 for all Hoffmann GmbH & Co. KG (Hoffmann) model HO-V 72 propellers. AD 2021-23-17 required amending the existing aircraft flight manual (AFM) by inserting abnormal propeller vibration instructions, visual inspection and non-destructive test (NDT) inspection of the propeller hub and, depending on the results of the inspections, replacement of the propeller hub with a part eligible for installation. Since the FAA issued AD 2021-23-17, further investigation by the manufacturer revealed that cracks found on propeller hubs likely resulted from propeller blade retention nuts that were not tightened using published service information during blade installation. This AD is prompted by reports of cracks at different positions on two affected propeller hubs. This AD retains the required actions of AD 2021-23-17. This AD also requires a maintenance records review and, depending on the results of the maintenance records review, tightening of each propeller blade retention nut to specific torque values. Depending on the results of the maintenance records review, this AD requires physically inspecting the propeller blade for shake. If any axial play is detected during the performance of the inspection, this AD requires the removal of the propeller from service and the performance of an NDT inspection of the propeller hub, and depending on the NDT inspection results, replacement of the propeller hub with a part eligible for installation. 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 210 (Tuesday, November 1, 2022)</title>
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[Federal Register Volume 87, Number 210 (Tuesday, November 1, 2022)]
[Rules and Regulations]
[Pages 65670-65673]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2022-23716]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2022-0980; Project Identifier MCAI-2022-00448-P;
Amendment 39-22212; AD 2022-21-13]
RIN 2120-AA64
Airworthiness Directives; Hoffmann GmbH & Co. KG Propellers
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2021-23-17
for all Hoffmann GmbH & Co. KG (Hoffmann) model HO-V 72 propellers. AD
2021-23-17 required amending the existing aircraft flight manual (AFM)
by inserting abnormal propeller vibration instructions, visual
inspection and non-destructive test (NDT) inspection of the propeller
hub and, depending on the results of the inspections, replacement of
the propeller hub with a part eligible for installation. Since the FAA
issued AD 2021-23-17, further investigation by the manufacturer
revealed that cracks found on propeller hubs likely resulted from
propeller blade retention nuts that were not tightened using published
service information during blade installation. This AD is prompted by
reports of cracks at different positions on two affected propeller
hubs. This AD retains the required actions of AD 2021-23-17. This AD
also requires a maintenance records review and, depending on the
results of the maintenance records review, tightening of each propeller
blade retention nut to specific torque values. Depending on the results
of the maintenance records review, this AD requires physically
inspecting the propeller blade for shake. If any axial play is detected
during the performance of the inspection, this AD requires the removal
of the propeller from service and the performance of an NDT inspection
of the propeller hub, and depending on the NDT inspection results,
replacement of the propeller hub 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 December 6, 2022.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of December 6,
2022.
The Director of the Federal Register approved the incorporation by
reference of a certain other publication listed in this AD as of
January 10, 2022 (86 FR 68905, December 6, 2021).
ADDRESSES:
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2022-0980; 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, the mandatory continuing airworthiness
information (MCAI), 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:
<bullet> For Hoffmann service information identified in this final
rule, contact Hoffmann GmbH & Co. KG, K[uuml]pferlingstrasse 9, 83022,
Rosenheim, Germany; phone: +49 0 8031 1878 0; email: <a href="/cdn-cgi/l/email-protection#2d44434b426d114c0d455f484b10" http: hoffmann-<a href="http://prop.com">prop.com</a>">hoffmann-<a href="http://prop.com">prop.com</a></a>">info@<a href="http://hoffmann-<a href="http://prop.com">prop.com</a>">hoffmann-<a href="http://prop.com">prop.com</a></a></a>; website: <a href="http://hoffmann-<a href="http://prop.com">prop.com</a>">hoffmann-<a href="http://prop.com">prop.com</a></a>.
<bullet> 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 <a href="http://regulations.gov">regulations.gov</a> under Docket No. FAA-2022-0980.
FOR FURTHER INFORMATION CONTACT: Michael Schwetz, Aviation Safety
Engineer, Boston ACO Branch, FAA, 1200 District Avenue, Burlington, MA
01803; phone: (781) 238-7761; email: <a href="/cdn-cgi/l/email-protection#132a3e5245403e525a413e5152505c3e505c40537572723d747c65"><span class="__cf_email__" data-cfemail="71485c3027225c3038235c3330323e5c323e22311710105f161e07">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Background
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 to supersede AD 2021-23-17, Amendment 39-21815 (86 FR
68905, December 6, 2021) (AD 2021-23-17). AD 2021-23-17 applied to all
Hoffmann GmbH & Co. KG model HO-V 72 propellers. AD 2021-23-17 required
amending the existing AFM by inserting abnormal propeller vibration
instructions, visual inspection and NDT inspection of the propeller hub
and, depending on the results of the inspections, replacement of the
propeller hub with a part eligible for installation. The FAA issued AD
2021-23-17 to prevent failure of the propeller hub.
The NPRM published in the Federal Register on August 01, 2022 (87
FR 46903). The NPRM was prompted by EASA AD 2022-0061, dated April 4,
2022 (referred to after this as ``the MCAI''), issued by the European
Union
[[Page 65671]]
Aviation Safety Agency (EASA), which is the Technical Agent for the
Member States of the European Union. The MCAI states:
Cracks have been reported at different positions on two affected
parts, both installed on Slingsby T67 ``Firefly'' aeroplanes. One
crack was found during scheduled inspection, the other crack during
an unscheduled inspection after abnormal vibrations occurred.
Subsequent investigation determined that improper tightening of
blade nuts has caused or contributed to those events.
This condition, if not detected and corrected, could lead to in-
flight propeller detachment, possibly resulting in damage to the
aeroplane and/or injury to persons on the ground.
To address this potential unsafe condition, Hoffmann Propeller
issued the SB, providing applicable instructions, and EASA issued
Emergency AD 2020-0226-E (later revised [to EASA AD 2020-0226R1]) to
require inspections of affected parts and, depending on findings,
replacement. That AD also required, for certain aeroplanes,
amendment of the applicable Aircraft Flight Manual (AFM).
Since that [EASA] AD was issued, further investigation revealed
that not all propeller blade nuts were tightened in accordance with
the Hoffman Propeller blade nut tightening procedure B2.23 which
requires a certain over-torquing and loosening of the blade nut to
limit a preload reduction due to material settlement. Prompted by
this development, Hoffmann Propeller issued SB057 (incorporating
blade nut tightening procedure B2.23) providing torquing
instructions, and SB58 providing instructions for setting correct
counterweight angles. Additionally, Hoffmann Propeller issued the
torque tightening SB (referencing SB57 and SB58) providing
inspections and corrective action instructions.
For the reasons described above, this [EASA] AD retains the
requirements of EASA AD 2020-0226R1, which is superseded, and
requires additional blade checks, inspections, and re-tightening of
the propeller blade nuts
You may examine the MCAI in the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2022-0980.
In the NPRM, the FAA proposed to retain all of the requirements of
AD 2021-23-17. In the NPRM, the FAA also proposed to require a
maintenance records review and, depending on the results of the
maintenance records review, tightening of each propeller blade
retention nut to specified torque values. Depending on the results of
the maintenance records review, the NPRM also proposed to require
physically inspecting the propeller blade for shake. If any axial play
is detected during inspection, the NPRM proposed to require the removal
of the propeller from service and the performance of an NDT inspection
of the propeller hub, and depending on the NDT inspection results,
replacement of the propeller hub with a part eligible for installation.
Discussion of Final Airworthiness Directive
Comments
The FAA received no comments on the NPRM or on the determination of
the costs.
Conclusion
These products have been approved by the aviation authority of
another country and are approved for operation in the United States.
Pursuant to the FAA's bilateral agreement with this State of Design
Authority, it has notified the FAA of the unsafe condition described in
the MCAI referenced above. 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, and the removal
of the reference to Hoffmann Propeller Service Bulletin SB059 B, dated
February 23, 2022, from paragraph (j)(2), this AD is adopted as
proposed in the NPRM. None of the changes will increase the economic
burden on any operator.
Related Service Information Under 1 CFR Part 51
The FAA reviewed the following service information:
<bullet> Hoffmann Propeller Service Bulletin SB057 C, dated
February 22, 2022. This service bulletin (SB) specifies procedures for
tightening the propeller blade retention nut.
<bullet> Hoffmann Propeller Service Bulletin SB059 B, dated
February 23, 2022. This SB specifies procedures for tightening the
propeller blade retention nut with the correct torque and inspecting
the propeller blade for shake.
<bullet> Hoffmann Propeller GmbH & Co. KG Service Bulletin SB E53
Rev. D, dated February 18, 2021, which was previously approved by the
Director of the Federal Register for incorporation by reference on
January 10, 2022 (86 FR 68905, December 6, 2021). This SB describes
procedures for visual and NDT inspections of the propeller hub for
cracks.
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 also reviewed the following service information:
<bullet> Hoffmann Propeller Service Bulletin SB058 A, dated
February 2, 2022. This SB specifies the updated definition of the
counterweight angle.
Costs of Compliance
The FAA estimates that this AD affects 35 propellers installed on
airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:
Estimated Costs
----------------------------------------------------------------------------------------------------------------
Cost per Cost on U.S.
Action Labor cost Parts cost product operators
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Amend AFM............................. 1 work-hour x $85 per $0 $85 $2,975
hour = $85.
Visually inspect propeller hub........ 1 work-hour x $85 per 0 85 2,975
hour = $85.
NDT inspect propeller hub............. 8 work-hours x $85 per 0 680 23,800
hour = $680.
Review maintenance records............ 0.5 work-hours x $85 per 0 42.50 1,487.50
hour = $42.50.
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The FAA estimates the following costs to do any necessary actions
that are required based on the results of the inspections. The agency
has no way of determining the number of aircraft that might need these
replacements:
[[Page 65672]]
On-Condition Costs
----------------------------------------------------------------------------------------------------------------
Cost per
Action Labor cost Parts cost product
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Replace propeller hub......................... 5 work-hours x $85 per hour = $1,600 $2,025
$425.
Inspect propeller blade for shake............. 0.25 work-hours x $85 per hour = 0 21.25
$21.25.
Tighten propeller blade retention nuts........ 2 work-hours x $85 per hour = 0 170
$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
The FAA has determined that 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:
0
a. Removing Airworthiness Directive 2021-23-17, Amendment 39-21815 (86
FR 68905, December 6, 2021); and
0
b. Adding the following new airworthiness directive:
2022-21-13 Hoffmann GmbH & Co. KG: Amendment 39-22212; Docket No.
FAA-2022-0980; Project Identifier MCAI-2022-00448-P.
(a) Effective Date
This airworthiness directive (AD) is effective December 6, 2022.
(b) Affected ADs
This AD replaces AD 2021-23-17, Amendment 39-21815 (86 FR 68905,
December 6, 2021) (AD 2021-23-17).
(c) Applicability
This AD applies to Hoffmann GmbH & Co. KG (Hoffmann) model HO-V
72 propellers.
(d) Subject
Joint Aircraft System Component (JASC) Code 6114, Propeller Hub
Section.
(e) Unsafe Condition
This AD was prompted by reports of cracks at different positions
on two affected propeller hubs. The FAA is issuing this AD to
prevent failure of the propeller hub. The unsafe condition, if not
addressed, could result in release of the propeller, damage to the
airplane, and injury to persons on the ground.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
(1) Before the next flight after December 22, 2020 (the
effective date of AD 2020-25-05, Amendment 39-21347 (85 FR 78702,
December 7, 2020)), amend the emergency or abnormal procedures
section of the existing aircraft flight manual by inserting this
text: ``Abnormal propeller vibrations: As applicable, reduce engine
RPM.''
(2) Before the next flight after January 10, 2022 (the effective
date of AD 2021-23-17), and thereafter, before the next flight after
any flight where abnormal propeller vibrations have been
experienced, visually inspect propeller hub HO-V 72 ( ) ( )-( )-( )
for cracks using paragraph 2.1 of Hoffmann Propeller GmbH & Co. KG
Service Bulletin SB E53, Rev. D, dated February 18, 2021 (Hoffmann
Propeller SB E53 Rev. D).
(3) Within 20 flight hours (FHs) after January 10, 2022 (the
effective date of AD 2021-23-17), perform a non-destructive test
(NDT) inspection of propeller hub HO-V 72 ( ) ( )-( )-( ) using
paragraph 2.3 of Hoffmann Propeller SB E53 Rev. D.
(4) During each overhaul of propeller hub HO-V 72 ( ) ( )-( )-(
) after January 10, 2022 (the effective date of AD 2021-23-17),
perform an NDT inspection using paragraph 2.3 of Hoffmann Propeller
SB E53 Rev. D.
(5) Within 30 days after the effective date of this AD, review
the maintenance records to confirm the propeller blade retention
nuts were tightened at the last in-shop maintenance visit to the
torque values in paragraph 5 of Hoffmann Propeller Service Bulletin
SB057 C, dated February 22, 2022 (Hoffmann Propeller SB057 C).
(6) If, during the records review required by paragraph (g)(5)
of this AD, it is determined that the propeller blade retention nuts
were not tightened to the torque values in paragraph 5 of Hoffmann
Propeller SB057 C, or it cannot be confirmed if the propeller blade
retention nuts were tightened to the torque values in paragraph 5 of
Hoffmann Propeller SB057 C, perform the following actions:
(i) Within 90 FHs after the effective date of this AD, tighten
each propeller blade retention nut to the torque values in paragraph
5 of Hoffmann Propeller SB057 C, using paragraphs 6 and 7 of
Hoffmann Propeller Service Bulletin SB059 B, dated February 23,
2022.
(ii) Before the next flight after the effective date of this AD
and, thereafter, before each flight until the propeller blade
retention nut is tightened to the torque values in paragraph 5 of
Hoffmann Propeller SB057 C, as required by paragraph (g)(6)(i) of
this AD, confirm that there is no axial play in the blade retention
system by inspecting the propeller blade for shake. If any axial
play is detected, remove the propeller from service and perform an
NDT inspection of the propeller hub using paragraph 2.3 of Hoffmann
Propeller SB E53 Rev. D.
(7) If, during any inspection required by paragraph (g)(2), (3),
(4) or (6)(ii) of this AD, any crack is detected, replace propeller
hub HO-V 72 ( ) ( )-( )-( ) with a part eligible for installation.
(h) Definition
For the purpose of this AD, a ``part eligible for installation''
is a propeller hub HO-V 72 ( ) ( )-( )-( ) with zero hours time
since new, or a propeller hub HO-V 72 ( ) ( )-( )-( ) that
[[Page 65673]]
has passed an NDT inspection using paragraph 2.3 of Hoffmann
Propeller SB E53 Rev. D.
(i) Non-Required Actions
(1) Sending the propeller to Hoffmann for investigation, as
contained in paragraph 2.1 of Hoffmann Propeller SB E53 Rev. D, is
not required by this AD.
(2) Reporting propeller hubs with cracks to Hoffmann, as
contained in paragraph 2.3 of Hoffmann Propeller SB E53 Rev. D, is
not required by this AD.
(j) Credit for Previous Actions
(1) You may take credit for the initial visual inspection and
NDT inspection of the propeller hub required by paragraphs (g)(2),
(3), and (4) of this AD if you performed any of these actions before
January 10, 2022 (the effective date of AD 2021 23-17) using
Hoffmann Propeller GmbH & Co. KG SB E53, Rev. A, dated October 9,
2020; Rev. B, dated October 14, 2020; or Rev. C, dated December 9,
2020.
(2) You may take credit for the records review to confirm the
propeller blade retention nuts were tightened to the torque values
as required by paragraph (g)(5) of this AD, and the tightening of
each propeller blade retention nut as required by paragraph
(g)(6)(i) of this AD if you performed any of these actions before
the effective date of this AD during the last in-shop maintenance
visit using Hoffmann Propeller Service Bulletin SB057 B, dated
February 8, 2022; or Hoffmann Propeller Service Bulletin SB059 A,
dated February 11, 2022.
(k) Special Flight Permit
A special flight permit may be issued in accordance with 14 CFR
21.197 and 21.199 to operate the airplane to a service facility to
perform the NDT inspection. Special flight permits are prohibited to
perform the visual inspection of the propeller hub.
(l) Alternative Methods of Compliance (AMOCs)
(1) The Manager, Boston ACO 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 (m)(1) of this AD.
(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.
(m) Additional Information
(1) For more information about this AD, contact Michael Schwetz,
Aviation Safety Engineer, Boston ACO Branch, FAA, 1200 District
Avenue, Burlington, MA 01803; phone: (781) 238-7761; email: <a href="/cdn-cgi/l/email-protection#734a5e3225205e323a215e3132303c5e303c20331512125d141c05"><span class="__cf_email__" data-cfemail="30091d7166631d7179621d7271737f1d737f63705651511e575f46">[email protected]</span></a>.
(2) Refer to European Union Aviation Safety Agency (EASA) AD
2022-0061, dated April 4, 2022, for related information. This EASA
AD may be found in the AD docket at regulatFAA-2022-0980.
(n) 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.
(3) The following service information was approved for IBR on
December 6, 2022.
(i) Hoffmann Propeller Service Bulletin SB057 C, dated February
22, 2022.
(ii) Hoffmann Propeller Service Bulletin SB059 B, dated February
23, 2022.
(4) The following service information was approved for IBR on
January 10, 2022 (86 FR 68905, December 6, 2021).
(i) Hoffmann Propeller GmbH & Co. KG Service Bulletin SB E53
Rev. D, dated February 18, 2021.
(ii) Reserved.
(5) For Hoffmann service information identified in this AD,
contact Hoffmann GmbH & Co. KG, K[uuml]pferlingstrasse 9, 83022,
Rosenheim, Germany; phone: +49 0 8031 1878 0; email: <a href="/cdn-cgi/l/email-protection#d3babdb5bc93efb2f3bba1b6b5ee" http: hoffmann-<a href="http://prop.com">prop.com</a>">hoffmann-<a href="http://prop.com">prop.com</a></a>">info@<a href="http://hoffmann-<a href="http://prop.com">prop.com</a>">hoffmann-<a href="http://prop.com">prop.com</a></a></a>; website: <a href="http://hoffmann-<a href="http://prop.com">prop.com</a>">hoffmann-<a href="http://prop.com">prop.com</a></a>.
(6) You may view this service information at 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.
(7) You may view this service information that is incorporated
by reference at the National Archives and Records Administration
(NARA). For information on the availability of this material at
NARA, email: <a href="/cdn-cgi/l/email-protection#c0a6b2eea9aeb3b0a5a3b4a9afae80aea1b2a1eea7afb6"><span class="__cf_email__" data-cfemail="4c2a3e6225223f3c292f382523220c222d3e2d622b233a">[email protected]</span></a>, or go to: <a href="http://www.archives.gov/federal-register/cfr/ibr-locations.html">www.archives.gov/federal-register/cfr/ibr-locations.html</a>.
Issued on October 6, 2022.
Christina Underwood,
Acting Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2022-23716 Filed 10-31-22; 8:45 am]
BILLING CODE 4910-13-P
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