83 FR 50821 - Airworthiness Directives; Hoffmann GmbH & Co. KG Propellers

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 83, Issue 196 (October 10, 2018)

Page Range		50821-50822
FR Document		2018-21507

We are adopting a new airworthiness directive (AD) for certain Hoffmann GmbH & Co. KG model HO-V 62 propellers. This AD was prompted by the failure of the propeller blade lag screws. This AD requires removal of the affected propeller blades and installation of modified propeller blades marked with change letter ``A'' or ``B.'' We are issuing this AD to address the unsafe condition on these products.

Federal Register, Volume 83 Issue 196 (Wednesday, October 10, 2018)

[Federal Register Volume 83, Number 196 (Wednesday, October 10, 2018)]
[Rules and Regulations]
[Pages 50821-50822]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2018-21507]



[[Page 50821]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2018-0281; Product Identifier 2018-NE-06-AD; Amendment 
39-19437; AD 2018-20-03]
RIN 2120-AA64


Airworthiness Directives; Hoffmann GmbH & Co. KG Propellers

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: We are adopting a new airworthiness directive (AD) for certain 
Hoffmann GmbH & Co. KG model HO-V 62 propellers. This AD was prompted 
by the failure of the propeller blade lag screws. This AD requires 
removal of the affected propeller blades and installation of modified 
propeller blades marked with change letter ``A'' or ``B.'' We are 
issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective November 14, 2018.

ADDRESSES: For service information identified in this final rule, 
contact Hoffmann Propeller GmbH & Co. KG, Sales and Service, 
K[uuml]pferlingstrasse 9, 83022 Rosenheim, Germany; phone: +49 (0) 8031 
1878 0; fax: +49 (0) 8031 1878 78; email: prop.com">info@hoffmann-prop.com. You 
may view this service information at the FAA, Engine & Propeller 
Standards Branch, 1200 District Avenue, Burlington, MA 01803. For 
information on the availability of this material at the FAA, call 781-
238-7759. It is also available on the internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2018-
0281.

Examining the AD Docket

    You may examine the AD docket on the internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2018-
0281; 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), the regulatory evaluation, any comments received, and other 
information. The address for Docket Operations (phone: 800-647-5527) 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: Maureen Maisttison, Aerospace 
Engineer, Boston ACO Branch, FAA, 1200 District Ave, Burlington, MA 
01803; phone: 781-238-7076; fax: 781-238-7151; email: 
[email protected].

SUPPLEMENTARY INFORMATION: 

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 by adding an AD that would apply to certain Hoffmann GmbH & Co. 
KG model HO-V 62 propellers. The NPRM published in the Federal Register 
on July 12, 2018 (83 FR 32219). The NPRM was prompted by the failure of 
the propeller blade lag screws. The NPRM proposed to require removal of 
the affected propeller blades and installation of modified propeller 
blades marked with change letter ``A'' or ``B.'' We are issuing this AD 
to address the unsafe condition on these products.
    The European Aviation Safety Agency (EASA), which is the Technical 
Agent for the Member States of the European Community, has issued EASA 
AD 2017-0220, dated November 10, 2017 (referred to after this as ``the 
MCAI''), to address the unsafe condition on these products. The MCAI 
states:

    In 1983, occurrences were reported of fatigue failure of 
propeller blade lag screws, at rotation speeds between 2950 and 3250 
revolutions per minute (RPM) in flight.
    This condition, if not detected and corrected, could lead to in-
flight propeller blade detachment, possibly resulting in damage to 
the powered sailplane and/or injury to persons on the ground.
    To address this potential unsafe condition, Hoffmann issued 
Service Bulletin (SB) 4, providing the necessary instructions. 
Consequently, LBA Germany issued AD 83-150 (later revised), which 
applied only to HO-V 62 propellers with R/L 160T blades, when in 
combination with a Limbach L 2000 engine, to require a limitation of 
continuous operation to 2 900 RPM, to prohibit aerobatic flights, 
calibrate the tachometer, install a placard, and inspection of the 
propeller blades. LBA AD 83-150/4 also required overhaul and 
replacement of the affected propeller blades with modified blades, 
either having 5 lag screws with 12 mm diameter, or 6 screws, and 
required implementing a time between overhaul (TBO) of 600 flight 
hours (FH).
    Since that [LBA] AD was issued, based on a stress analysis of 
lag screws on blades with continuous operating speed above 2 900 
RPM, it was determined that the 6-screws configuration or the 5 
screws configuration with increased strength is necessary to ensure 
safe propeller operation. In addition, since the LBA AD applied only 
to a limited population (Limbach engine only), many propellers have 
not been modified as described in Hoffmann SB 4C. Consequently, 
Hoffmann issued SB E34 Revision B, to provide blade replacement 
instructions

    You may obtain further information by examining the MCAI in the AD 
docket on the internet at http://www.regulations.gov by searching for 
and locating Docket No. FAA-2018-0281.

Comments

    We gave the public the opportunity to participate in developing 
this final rule. We received no comments on the NPRM or on the 
determination of the cost to the public.

Revised the Name of the Type Certificate Holder

    We determined that the name of the type certificate (TC) design 
holder that we used in the NPRM does not match the name used in the 
type certificate data sheet. We have revised references in this AD from 
``Hoffmann Propeller GmbH & Co. KG'' to ``Hoffmann GmbH & Co. KG'' when 
we are referring to the name of the TC design holder.

Conclusion

    We reviewed the relevant data and determined that air safety and 
the public interest require adopting this final rule as proposed except 
for minor editorial changes. We have determined that these minor 
changes:
     Are consistent with the intent that was proposed in the 
NPRM for addressing the unsafe condition; and
     Do not add any additional burden upon the public than was 
already proposed in the NPRM.

Related Service Information

    We reviewed Hoffmann Propeller GmbH & Co. KG Service Bulletin (SB) 
E34 Rev. B, dated September 18, 2017. The SB describes the instructions 
for the removal and installation of the propeller blades.

Costs of Compliance

    We estimate that this AD affects 50 propellers installed on 
airplanes of U.S. registry.
    We estimate the following costs to comply with this AD:

[[Page 50822]]



                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
                Action                         Labor cost           Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Replace blades between overhaul.......  3 work-hours x $85 per            $3,150          $3,405         $85,125
                                         hour = $255.
Replace blades at overhaul............  0 work-hours x $85 per             3,150           3,150          78,750
                                         hour = $0.
----------------------------------------------------------------------------------------------------------------

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.
    We are 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 is issued in accordance with authority delegated by the 
Executive Director, Aircraft Certification Service, as authorized by 
FAA Order 8000.51C. In accordance with that order, issuance of ADs is 
normally a function of the Compliance and Airworthiness Division, but 
during this transition period, the Executive Director has delegated the 
authority to issue ADs applicable to engines, propellers, and 
associated appliances to the Manager, Engine and Propeller Standards 
Branch, Policy and Innovation Division.

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 this AD:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Is not a ``significant rule'' under the DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979),
    (3) Will not affect intrastate aviation in Alaska, and
    (4) 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.

Adoption of 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 (AD):

2018-20-03 Hoffmann GmbH & Co. KG: Amendment 39-19437; Docket No. 
FAA-2018-0281; Product Identifier 2018-NE-06-AD.

(a) Effective Date

    This AD is effective November 14, 2018.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to Hoffmann GmbH & Co. KG model HO-V 62 
propellers without modified blades marked with change letter ``A'' 
or ``B'' suffix to the serial number (S/N).

(d) Subject

    Joint Aircraft System Component (JASC) Code 6110, Propeller 
Assembly.

(e) Unsafe Condition

    This AD was prompted by the failure of the propeller blade lag 
screws. We are issuing the AD to prevent failure of the propeller. 
The unsafe condition, if not addressed, could result in the release 
of the propeller blade, damage to the aircraft, and injury and/or 
loss of life.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Required Actions

    Within 30 days of the effective date of this AD, remove the 
applicable propeller blades and install modified propeller blades 
marked with a change letter ``A'' or ``B'' suffix to the S/N marked 
on the blade.

(h) Installation Prohibition

    After the effective date of this AD, do not install a propeller 
blade if it is not marked with a change letter ``A'' or ``B'' suffix 
to the S/N marked on the blade.

(i) 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 Boston ACO Branch, send it to the attention of the 
person identified in paragraph (j)(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.

(j) Related Information

    (1) For more information about this AD, contact Maureen 
Maisttison, Aerospace Engineer, Boston ACO Branch, FAA, 1200 
District Ave, Burlington, MA, 01803; phone: 781-238-7076; fax: 781-
238-7151; email: [email protected].
    (2) Refer to European Aviation Safety Agency AD 2017-0220, dated 
November 10, 2017, for more information. You may examine the EASA AD 
in the AD docket on the internet at http://www.regulations.gov by 
searching for and locating Docket No. FAA-2018-0281.

    Issued in Burlington, Massachusetts, on September 27, 2018.
Robert J. Ganley,
Manager, Engine and Propeller Standards Branch, Aircraft Certification 
Service.
[FR Doc. 2018-21507 Filed 10-9-18; 8:45 am]
 BILLING CODE 4910-13-P

Federal Register / Vol. 83, No. 196 / Wednesday, October 10, 2018 / Rules and Regulations 50821

DEPARTMENT OF TRANSPORTATION M–30, West Building Ground Floor, RPM, it was determined that the 6-screws
Room W12–140, 1200 New Jersey configuration or the 5 screws configuration
Federal Aviation Administration Avenue SE, Washington, DC 20590. with increased strength is necessary to
ensure safe propeller operation. In addition,
FOR FURTHER INFORMATION CONTACT: since the LBA AD applied only to a limited
14 CFR Part 39 Maureen Maisttison, Aerospace population (Limbach engine only), many
[Docket No. FAA–2018–0281; Product Engineer, Boston ACO Branch, FAA, propellers have not been modified as
Identifier 2018–NE–06–AD; Amendment 39– 1200 District Ave, Burlington, MA described in Hoffmann SB 4C. Consequently,
19437; AD 2018–20–03] 01803; phone: 781–238–7076; fax: 781– Hoffmann issued SB E34 Revision B, to
238–7151; email: maureen.maisttison@ provide blade replacement instructions
RIN 2120–AA64
faa.gov. You may obtain further information
Airworthiness Directives; Hoffmann SUPPLEMENTARY INFORMATION: by examining the MCAI in the AD
GmbH & Co. KG Propellers docket on the internet at http://
Discussion
AGENCY: Federal Aviation www.regulations.gov by searching for
We issued a notice of proposed and locating Docket No. FAA–2018–
Administration (FAA), DOT.
rulemaking (NPRM) to amend 14 CFR 0281.
ACTION: Final rule. part 39 by adding an AD that would
apply to certain Hoffmann GmbH & Co. Comments
SUMMARY: We are adopting a new
airworthiness directive (AD) for certain KG model HO–V 62 propellers. The We gave the public the opportunity to
Hoffmann GmbH & Co. KG model HO– NPRM published in the Federal participate in developing this final rule.
V 62 propellers. This AD was prompted Register on July 12, 2018 (83 FR 32219). We received no comments on the NPRM
by the failure of the propeller blade lag The NPRM was prompted by the failure or on the determination of the cost to
screws. This AD requires removal of the of the propeller blade lag screws. The the public.
affected propeller blades and NPRM proposed to require removal of
the affected propeller blades and Revised the Name of the Type
installation of modified propeller blades Certificate Holder
marked with change letter ‘‘A’’ or ‘‘B.’’ installation of modified propeller blades
We are issuing this AD to address the marked with change letter ‘‘A’’ or ‘‘B.’’ We determined that the name of the
unsafe condition on these products. We are issuing this AD to address the type certificate (TC) design holder that
DATES: This AD is effective November
unsafe condition on these products. we used in the NPRM does not match
The European Aviation Safety Agency the name used in the type certificate
14, 2018.
(EASA), which is the Technical Agent data sheet. We have revised references
ADDRESSES: For service information
for the Member States of the European in this AD from ‘‘Hoffmann Propeller
identified in this final rule, contact Community, has issued EASA AD 2017–
Hoffmann Propeller GmbH & Co. KG, GmbH & Co. KG’’ to ‘‘Hoffmann GmbH
0220, dated November 10, 2017 & Co. KG’’ when we are referring to the
Sales and Service, Küpferlingstrasse 9, (referred to after this as ‘‘the MCAI’’), to
83022 Rosenheim, Germany; phone: +49 name of the TC design holder.
address the unsafe condition on these
(0) 8031 1878 0; fax: +49 (0) 8031 1878 products. The MCAI states: Conclusion
78; email: info@hoffmann-prop.com.
You may view this service information In 1983, occurrences were reported of We reviewed the relevant data and
at the FAA, Engine & Propeller fatigue failure of propeller blade lag screws, determined that air safety and the
Standards Branch, 1200 District
at rotation speeds between 2950 and 3250 public interest require adopting this
revolutions per minute (RPM) in flight. final rule as proposed except for minor
Avenue, Burlington, MA 01803. For This condition, if not detected and
information on the availability of this editorial changes. We have determined
corrected, could lead to in-flight propeller that these minor changes:
material at the FAA, call 781–238–7759. blade detachment, possibly resulting in
It is also available on the internet at damage to the powered sailplane and/or • Are consistent with the intent that
http://www.regulations.gov by searching injury to persons on the ground. was proposed in the NPRM for
for and locating Docket No. FAA–2018– To address this potential unsafe condition, addressing the unsafe condition; and
0281. Hoffmann issued Service Bulletin (SB) 4, • Do not add any additional burden
providing the necessary instructions. upon the public than was already
Examining the AD Docket Consequently, LBA Germany issued AD 83– proposed in the NPRM.
You may examine the AD docket on 150 (later revised), which applied only to
HO–V 62 propellers with R/L 160T blades, Related Service Information
the internet at http:// when in combination with a Limbach L 2000
www.regulations.gov by searching for engine, to require a limitation of continuous We reviewed Hoffmann Propeller
and locating Docket No. FAA–2018– operation to 2 900 RPM, to prohibit aerobatic GmbH & Co. KG Service Bulletin (SB)
0281; or in person at Docket Operations flights, calibrate the tachometer, install a E34 Rev. B, dated September 18, 2017.
between 9 a.m. and 5 p.m., Monday placard, and inspection of the propeller The SB describes the instructions for the
through Friday, except Federal holidays. blades. LBA AD 83–150/4 also required removal and installation of the propeller
The AD docket contains this final rule, overhaul and replacement of the affected blades.
the mandatory continuing airworthiness propeller blades with modified blades, either
having 5 lag screws with 12 mm diameter, or Costs of Compliance
information (MCAI), the regulatory
6 screws, and required implementing a time
evaluation, any comments received, and We estimate that this AD affects 50
between overhaul (TBO) of 600 flight hours
other information. The address for (FH). propellers installed on airplanes of U.S.
Docket Operations (phone: 800–647– Since that [LBA] AD was issued, based on registry.
daltland on DSKBBV9HB2PROD with RULES

5527) is U.S. Department of a stress analysis of lag screws on blades with We estimate the following costs to
Transportation, Docket Operations, continuous operating speed above 2 900 comply with this AD:

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50822 Federal Register / Vol. 83, No. 196 / Wednesday, October 10, 2018 / Rules and Regulations

ESTIMATED COSTS
Cost per Cost on U.S.
Action Labor cost Parts cost product operators

Replace blades between overhaul ................. 3 work-hours × $85 per hour = $255 ............. $3,150 $3,405 $85,125
Replace blades at overhaul ............................ 0 work-hours × $85 per hour = $0 ................. 3,150 3,150 78,750

Authority for This Rulemaking (4) Will not have a significant (g) Required Actions
Title 49 of the United States Code economic impact, positive or negative, Within 30 days of the effective date of this
specifies the FAA’s authority to issue on a substantial number of small entities AD, remove the applicable propeller blades
rules on aviation safety. Subtitle I, under the criteria of the Regulatory and install modified propeller blades marked
section 106, describes the authority of Flexibility Act. with a change letter ‘‘A’’ or ‘‘B’’ suffix to the
the FAA Administrator. Subtitle VII: S/N marked on the blade.
List of Subjects in 14 CFR Part 39
Aviation Programs, describes in more (h) Installation Prohibition
detail the scope of the Agency’s Air transportation, Aircraft, Aviation
safety, Incorporation by reference, After the effective date of this AD, do not
authority. install a propeller blade if it is not marked
We are issuing this rulemaking under Safety.
with a change letter ‘‘A’’ or ‘‘B’’ suffix to the
the authority described in Subtitle VII, Adoption of the Amendment S/N marked on the blade.
Part A, Subpart III, Section 44701:
‘‘General requirements.’’ Under that Accordingly, under the authority (i) Alternative Methods of Compliance
section, Congress charges the FAA with delegated to me by the Administrator, (AMOCs)
promoting safe flight of civil aircraft in the FAA amends 14 CFR part 39 as (1) The Manager, Boston ACO Branch,
air commerce by prescribing regulations follows: FAA, has the authority to approve AMOCs
for practices, methods, and procedures for this AD, if requested using the procedures
the Administrator finds necessary for PART 39—AIRWORTHINESS found in 14 CFR 39.19. In accordance with
safety in air commerce. This regulation DIRECTIVES 14 CFR 39.19, send your request to your
is within the scope of that authority principal inspector or local Flight Standards
because it addresses an unsafe condition ■ 1. The authority citation for part 39 District Office, as appropriate. If sending
that is likely to exist or develop on continues to read as follows: information directly to the manager of the
products identified in this rulemaking Authority: 49 U.S.C. 106(g), 40113, 44701. Boston ACO Branch, send it to the attention
action. of the person identified in paragraph (j)(1) of
This AD is issued in accordance with § 39.13 [Amended] this AD.
authority delegated by the Executive (2) Before using any approved AMOC,
Director, Aircraft Certification Service, ■ 2. The FAA amends § 39.13 by adding notify your appropriate principal inspector,
as authorized by FAA Order 8000.51C. the following new airworthiness or lacking a principal inspector, the manager
In accordance with that order, issuance directive (AD): of the local flight standards district office/
of ADs is normally a function of the 2018–20–03 Hoffmann GmbH & Co. KG: certificate holding district office.
Compliance and Airworthiness Amendment 39–19437; Docket No.
(j) Related Information
Division, but during this transition FAA–2018–0281; Product Identifier
2018–NE–06–AD. (1) For more information about this AD,
period, the Executive Director has
contact Maureen Maisttison, Aerospace
delegated the authority to issue ADs (a) Effective Date
Engineer, Boston ACO Branch, FAA, 1200
applicable to engines, propellers, and This AD is effective November 14, 2018. District Ave, Burlington, MA, 01803; phone:
associated appliances to the Manager, 781–238–7076; fax: 781–238–7151; email:
Engine and Propeller Standards Branch, (b) Affected ADs
maureen.maisttison@faa.gov.
Policy and Innovation Division. None.
(2) Refer to European Aviation Safety
Regulatory Findings (c) Applicability Agency AD 2017–0220, dated November 10,
This AD applies to Hoffmann GmbH & Co. 2017, for more information. You may
This AD will not have federalism KG model HO–V 62 propellers without examine the EASA AD in the AD docket on
implications under Executive Order modified blades marked with change letter the internet at http://www.regulations.gov by
13132. This AD will not have a ‘‘A’’ or ‘‘B’’ suffix to the serial number (S/N). searching for and locating Docket No. FAA–
substantial direct effect on the States, on 2018–0281.
(d) Subject
the relationship between the national
government and the States, or on the Joint Aircraft System Component (JASC) Issued in Burlington, Massachusetts, on
distribution of power and Code 6110, Propeller Assembly. September 27, 2018.
responsibilities among the various (e) Unsafe Condition Robert J. Ganley,
levels of government. This AD was prompted by the failure of the Manager, Engine and Propeller Standards
For the reasons discussed above, I propeller blade lag screws. We are issuing the Branch, Aircraft Certification Service.
certify this AD: AD to prevent failure of the propeller. The [FR Doc. 2018–21507 Filed 10–9–18; 8:45 am]
(1) Is not a ‘‘significant regulatory unsafe condition, if not addressed, could BILLING CODE 4910–13–P
action’’ under Executive Order 12866, result in the release of the propeller blade,
daltland on DSKBBV9HB2PROD with RULES

(2) Is not a ‘‘significant rule’’ under damage to the aircraft, and injury and/or loss
the DOT Regulatory Policies and of life.
Procedures (44 FR 11034, February 26, (f) Compliance
1979), Comply with this AD within the
(3) Will not affect intrastate aviation compliance times specified, unless already
in Alaska, and done.

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Document Created: 2018-10-10 17:35:48
Document Modified: 2018-10-10 17:35:48

Category		Regulatory Information
Collection		Federal Register
sudoc Class		AE 2.7: GS 4.107: AE 2.106:
Publisher		Office of the Federal Register, National Archives and Records Administration
Section		Rules and Regulations
Action		Final rule.
Dates		This AD is effective November 14, 2018.
Contact		Maureen Maisttison, Aerospace Engineer, Boston ACO Branch, FAA, 1200 District Ave, Burlington, MA 01803; phone: 781-238-7076; fax: 781-238-7151; email: [email protected]
FR Citation		83 FR 50821
RIN Number		2120-AA64
CFR Associated		Air Transportation; Aircraft; Aviation Safety; Incorporation by Reference and Safety

83 FR 50821 - Airworthiness Directives; Hoffmann GmbH & Co. KG Propellers

DEPARTMENT OF TRANSPORTATIONFederal Aviation Administration

Federal Register Volume 83, Issue 196 (October 10, 2018)

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration