81 FR 23155 - Airworthiness Directives; Turbomeca S.A. Turboshaft Engines

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 81, Issue 76 (April 20, 2016)

Page Range		23155-23156
FR Document		2016-09121

We are adopting a new airworthiness directive (AD) for all Turbomeca S.A. Arriel 2E turboshaft engines. This AD requires removing the pre-TU 193 adjusted high-pressure/low-pressure pump and metering valve assembly and replacing it with a part that is eligible for installation. This AD also requires replacing the constant delta- pressure (delta-P) diaphragm of the fuel metering valve. This AD was prompted by reports of fuel flow non-conformities found during acceptance tests of Arriel 2E hydro-mechanical metering units (HMUs). We are issuing this AD to prevent failure of the delta-P diaphragm, which could result in an uncommanded in-flight shutdown and damage to the helicopter.

Federal Register, Volume 81 Issue 76 (Wednesday, April 20, 2016)

[Federal Register Volume 81, Number 76 (Wednesday, April 20, 2016)]
[Rules and Regulations]
[Pages 23155-23156]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2016-09121]



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Rules and Regulations
                                                Federal Register
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having general applicability and legal effect, most of which are keyed 
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under 50 titles pursuant to 44 U.S.C. 1510.

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Federal Register / Vol. 81, No. 76 / Wednesday, April 20, 2016 / 
Rules and Regulations

[[Page 23155]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2015-5539; Directorate Identifier 2015-NE-37-AD; 
Amendment 39-18493; AD 2016-08-16]
RIN 2120-AA64


Airworthiness Directives; Turbomeca S.A. Turboshaft Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: We are adopting a new airworthiness directive (AD) for all 
Turbomeca S.A. Arriel 2E turboshaft engines. This AD requires removing 
the pre-TU 193 adjusted high-pressure/low-pressure pump and metering 
valve assembly and replacing it with a part that is eligible for 
installation. This AD also requires replacing the constant delta-
pressure (delta-P) diaphragm of the fuel metering valve. This AD was 
prompted by reports of fuel flow non-conformities found during 
acceptance tests of Arriel 2E hydro-mechanical metering units (HMUs). 
We are issuing this AD to prevent failure of the delta-P diaphragm, 
which could result in an uncommanded in-flight shutdown and damage to 
the helicopter.

DATES: This AD becomes effective May 25, 2016.

ADDRESSES: For service information identified in this AD, contact 
Turbomeca S.A., 40220 Tarnos, France; phone: 33 (0)5 59 74 40 00; fax: 
33 (0)5 59 74 45 15. You may view this service information at the FAA, 
Engine & Propeller Directorate, 1200 District Avenue, Burlington, MA. 
For information on the availability of this material at the FAA, call 
781-238-7125. It is also available on the Internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2015-
5539.

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-2015-
5539; or in person at the Docket Management Facility between 9 a.m. and 
5 p.m., Monday through Friday, except Federal holidays. The AD docket 
contains this AD, the mandatory continuing airworthiness information 
(MCAI), the regulatory evaluation, any comments received, and other 
information. The address for the Docket Office (phone: 800-647-5527) is 
Document Management Facility, 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 Gustafson, Aerospace Engineer, 
Engine Certification Office, FAA, Engine & Propeller Directorate, 1200 
District Avenue, Burlington, MA 01803; phone: 781-238-7183; fax: 781-
238-7199; 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 the specified products. The 
NPRM was published in the Federal Register on January 4, 2016 (81 FR 
30). The NPRM proposed to correct an unsafe condition for the specified 
products. The MCAI states:

    Fuel flow non-conformities were found during reception tests of 
ARRIEL 2E Hydraulic Mechanical Metering Unit (HMU). Investigation 
and instrumented tests revealed instabilities on the additional 
check valve. These instabilities lead to hydraulic pulses. All HMU 
installed on ARRIEL 2E and 2N engines could present these 
instabilities.
    This condition, if not corrected, could lead to life reduction 
of the delta pressure valve diaphragm, and consequently, an 
uncommanded engine power increase, or an uncommanded in flight 
shutdown, possibly resulting in an emergency landing.

    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-2015-5539.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We received no comments on the NPRM (81 FR 30, January 4, 
2016).

Conclusion

    We reviewed the available data and determined that air safety and 
the public interest require adopting this AD as proposed.

Related Service Information

    Turbomeca S.A. has issued Mandatory Service Bulletin (MSB) No. 292 
73 2193, Version A, dated July 16, 2015. The MSB describes procedures 
for incorporating modification TU 193 and replacing the constant delta-
P diaphragm of the fuel metering valve.

Costs of Compliance

    We estimate that this AD affects 12 engines installed on 
helicopters of U.S. registry. We also estimate that it will take about 
2 hours per engine to comply with this AD. The average labor rate is 
$85 per hour. Required parts cost about $13,400 per engine. Based on 
these figures, we estimate the cost of this AD on U.S. operators to be 
$162,840.

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.

Regulatory Findings

    We 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

[[Page 23156]]

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 to the extent 
that it justifies making a regulatory distinction, 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):

2016-08-16 Turbomeca S.A.: Amendment 39-18493; Docket No. FAA-2015-
5539; Directorate Identifier 2015-NE-37-AD.

(a) Effective Date

    This AD becomes effective May 25, 2016.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to all Turbomeca S.A. Arriel 2E turboshaft 
engines that have a pre-TU 193 adjusted high-pressure/low-pressure 
(HP/LP) pump and metering valve assembly, installed.

(d) Reason

    This AD was prompted by reports of fuel flow non-conformities 
found during acceptance tests of Arriel 2E hydro-mechanical metering 
units. We are issuing this AD to prevent failure of the constant 
delta-pressure (delta-P) diaphragm of the fuel metering valve, which 
could result in an uncommanded in-flight shutdown and damage to the 
helicopter.

(e) Actions and Compliance

    Comply with this AD within the compliance times specified, 
unless already done.
    (1) Prior to exceeding 880 operating hours since new on the 
adjusted HP/LP pump and metering valve assembly or within 50 
operating hours after the effective date of this AD, whichever 
occurs later:
    (i) Remove from service the adjusted HP/LP pump and metering 
valve assembly and replace with a part that is eligible for 
installation, and
    (ii) replace the constant delta-P diaphragm of the fuel metering 
valve.
    (2) Reserved.

(f) Installation Prohibition

    After the effective date of this AD, do not install into any 
engine any pre-TU 193 adjusted HP/LP pump and metering valve 
assembly, nor install onto any helicopter any engine that has a pre-
TU 193 adjusted HP/LP pump and metering valve assembly.

(g) Alternative Methods of Compliance (AMOCs)

    The Manager, Engine Certification Office, FAA, may approve AMOCs 
for this AD. Use the procedures found in 14 CFR 39.19 to make your 
request. You may email your request to: [email protected].

(h) Related Information

    (1) For more information about this AD, contact Kyle Gustafson, 
Aerospace Engineer, Engine Certification Office, FAA, Engine & 
Propeller Directorate, 1200 District Avenue, Burlington, MA 01803; 
phone: 781-238-7183; fax: 781-238-7199; email: 
[email protected].
    (2) Refer to MCAI European Aviation Safety Agency AD 2015-0213, 
dated October 16, 2015, for more information. You may examine the 
MCAI in the AD docket on the Internet at https://www.regulations.gov/#!documentDetail;D=FAA-2015-5539-0002.
    (3) Turbomeca S.A. Mandatory Service Bulletin No. 292 73 2193, 
Version A, dated July 16, 2015, can be obtained from Turbomeca S.A., 
using the contact information in paragraph (h)(4) of this AD.
    (4) For service information identified in this AD, contact 
Turbomeca S.A., 40220 Tarnos, France; phone: 33 (0)5 59 74 40 00; 
fax: 33 (0)5 59 74 45 15.
    (5) You may view this service information at the FAA, Engine & 
Propeller Directorate, 1200 District Avenue, Burlington, MA. For 
information on the availability of this material at the FAA, call 
781-238-7125.

(i) Material Incorporated by Reference

    None.

    Issued in Burlington, Massachusetts, on April 12, 2016.
Ann C. Mollica,
Acting Manager, Engine & Propeller Directorate, Aircraft Certification 
Service.
[FR Doc. 2016-09121 Filed 4-19-16; 8:45 am]
 BILLING CODE 4910-13-P

23155

Rules and Regulations Federal Register
Vol. 81, No. 76

Wednesday, April 20, 2016

This section of the FEDERAL REGISTER for and locating Docket No. FAA–2015– Comments
contains regulatory documents having general 5539. We gave the public the opportunity to
applicability and legal effect, most of which
are keyed to and codified in the Code of Examining the AD Docket participate in developing this AD. We
Federal Regulations, which is published under received no comments on the NPRM (81
You may examine the AD docket on
50 titles pursuant to 44 U.S.C. 1510. FR 30, January 4, 2016).
the Internet at http://
The Code of Federal Regulations is sold by
www.regulations.gov by searching for Conclusion
the Superintendent of Documents. Prices of and locating Docket No. FAA–2015– We reviewed the available data and
new books are listed in the first FEDERAL 5539; or in person at the Docket determined that air safety and the
REGISTER issue of each week. Management Facility between 9 a.m. public interest require adopting this AD
and 5 p.m., Monday through Friday, as proposed.
except Federal holidays. The AD docket
DEPARTMENT OF TRANSPORTATION contains this AD, the mandatory Related Service Information
continuing airworthiness information Turbomeca S.A. has issued
Federal Aviation Administration (MCAI), the regulatory evaluation, any Mandatory Service Bulletin (MSB) No.
comments received, and other 292 73 2193, Version A, dated July 16,
14 CFR Part 39 information. The address for the Docket 2015. The MSB describes procedures for
[Docket No. FAA–2015–5539; Directorate Office (phone: 800–647–5527) is incorporating modification TU 193 and
Identifier 2015–NE–37–AD; Amendment 39– Document Management Facility, U.S. replacing the constant delta-P
18493; AD 2016–08–16] Department of Transportation, Docket diaphragm of the fuel metering valve.
Operations, M–30, West Building
RIN 2120–AA64 Costs of Compliance
Ground Floor, Room W12–140, 1200
New Jersey Avenue SE., Washington, We estimate that this AD affects 12
Airworthiness Directives; Turbomeca
DC 20590. engines installed on helicopters of U.S.
S.A. Turboshaft Engines
FOR FURTHER INFORMATION CONTACT: Kyle registry. We also estimate that it will
AGENCY: Federal Aviation Gustafson, Aerospace Engineer, Engine take about 2 hours per engine to comply
Administration (FAA), DOT. Certification Office, FAA, Engine & with this AD. The average labor rate is
ACTION: Final rule. Propeller Directorate, 1200 District $85 per hour. Required parts cost about
Avenue, Burlington, MA 01803; phone: $13,400 per engine. Based on these
SUMMARY: We are adopting a new 781–238–7183; fax: 781–238–7199; figures, we estimate the cost of this AD
airworthiness directive (AD) for all email: kyle.gustafson@faa.gov. on U.S. operators to be $162,840.
Turbomeca S.A. Arriel 2E turboshaft SUPPLEMENTARY INFORMATION: Authority for This Rulemaking
engines. This AD requires removing the
pre-TU 193 adjusted high-pressure/low- Discussion Title 49 of the United States Code
pressure pump and metering valve specifies the FAA’s authority to issue
We issued a notice of proposed
assembly and replacing it with a part rules on aviation safety. Subtitle I,
rulemaking (NPRM) to amend 14 CFR section 106, describes the authority of
that is eligible for installation. This AD part 39 by adding an AD that would
also requires replacing the constant the FAA Administrator. ‘‘Subtitle VII:
apply to the specified products. The Aviation Programs,’’ describes in more
delta-pressure (delta-P) diaphragm of NPRM was published in the Federal
the fuel metering valve. This AD was detail the scope of the Agency’s
Register on January 4, 2016 (81 FR 30). authority.
prompted by reports of fuel flow non- The NPRM proposed to correct an
conformities found during acceptance We are issuing this rulemaking under
unsafe condition for the specified the authority described in ‘‘Subtitle VII,
tests of Arriel 2E hydro-mechanical products. The MCAI states:
metering units (HMUs). We are issuing Part A, Subpart III, Section 44701:
Fuel flow non-conformities were found General requirements.’’ Under that
this AD to prevent failure of the delta- during reception tests of ARRIEL 2E
P diaphragm, which could result in an section, Congress charges the FAA with
Hydraulic Mechanical Metering Unit (HMU). promoting safe flight of civil aircraft in
uncommanded in-flight shutdown and Investigation and instrumented tests revealed
damage to the helicopter. air commerce by prescribing regulations
instabilities on the additional check valve.
These instabilities lead to hydraulic pulses. for practices, methods, and procedures
DATES: This AD becomes effective May
All HMU installed on ARRIEL 2E and 2N the Administrator finds necessary for
25, 2016. safety in air commerce. This regulation
engines could present these instabilities.
ADDRESSES: For service information This condition, if not corrected, could lead is within the scope of that authority
identified in this AD, contact to life reduction of the delta pressure valve because it addresses an unsafe condition
Turbomeca S.A., 40220 Tarnos, France; diaphragm, and consequently, an that is likely to exist or develop on
phone: 33 (0)5 59 74 40 00; fax: 33 (0)5 uncommanded engine power increase, or an products identified in this rulemaking
59 74 45 15. You may view this service uncommanded in flight shutdown, possibly
action.
information at the FAA, Engine & resulting in an emergency landing.
Lhorne on DSK5TPTVN1PROD with RULES

Propeller Directorate, 1200 District You may obtain further information Regulatory Findings
Avenue, Burlington, MA. For by examining the MCAI in the AD We determined that this AD will not
information on the availability of this docket on the Internet at http:// have federalism implications under
material at the FAA, call 781–238–7125. www.regulations.gov by searching for Executive Order 13132. This AD will
It is also available on the Internet at and locating Docket No. FAA–2015– not have a substantial direct effect on
http://www.regulations.gov by searching 5539. the States, on the relationship between

VerDate Sep<11>2014 14:49 Apr 19, 2016 Jkt 238001 PO 00000 Frm 00001 Fmt 4700 Sfmt 4700 E:\FR\FM\20APR1.SGM 20APR1

23156 Federal Register / Vol. 81, No. 76 / Wednesday, April 20, 2016 / Rules and Regulations

the national government and the States, (e) Actions and Compliance DEPARTMENT OF THE TREASURY
or on the distribution of power and Comply with this AD within the
responsibilities among the various compliance times specified, unless already Alcohol and Tobacco Tax and Trade
levels of government. done. Bureau
For the reasons discussed above, I (1) Prior to exceeding 880 operating hours
certify this AD: since new on the adjusted HP/LP pump and 27 CFR Part 9
(1) Is not a ‘‘significant regulatory metering valve assembly or within 50
[Docket No. TTB–2015–0005; T.D. TTB–136;
action’’ under Executive Order 12866, operating hours after the effective date of this
Ref: Notice Nos. 149 & 149A]
AD, whichever occurs later:
(2) Is not a ‘‘significant rule’’ under (i) Remove from service the adjusted HP/ RIN 1513–AC14
the DOT Regulatory Policies and LP pump and metering valve assembly and
Procedures (44 FR 11034, February 26, replace with a part that is eligible for Establishment of the Lewis-Clark
1979), installation, and Valley Viticultural Area and
(3) Will not affect intrastate aviation (ii) replace the constant delta-P diaphragm Realignment of the Columbia Valley
in Alaska to the extent that it justifies of the fuel metering valve. Viticultural Area
making a regulatory distinction, and (2) Reserved.
(4) Will not have a significant AGENCY: Alcohol and Tobacco Tax and
(f) Installation Prohibition Trade Bureau, Treasury.
economic impact, positive or negative,
After the effective date of this AD, do not ACTION: Final rule; Treasury decision.
on a substantial number of small entities
install into any engine any pre-TU 193
under the criteria of the Regulatory adjusted HP/LP pump and metering valve SUMMARY: The Alcohol and Tobacco Tax
Flexibility Act. assembly, nor install onto any helicopter any and Trade Bureau (TTB) establishes the
List of Subjects in 14 CFR Part 39 engine that has a pre-TU 193 adjusted HP/LP approximately 306,650-acre Lewis-Clark
pump and metering valve assembly. Valley viticultural area in portions of
Air transportation, Aircraft, Aviation
(g) Alternative Methods of Compliance Nez Perce, Lewis, Clearwater, and Latah
safety, Incorporation by reference,
(AMOCs) Counties in Idaho and Asotin, Garfield,
Safety.
The Manager, Engine Certification Office, and Whitman Counties in Washington.
Adoption of the Amendment FAA, may approve AMOCs for this AD. Use TTB is also modifying the boundary of
the procedures found in 14 CFR 39.19 to the existing Columbia Valley
Accordingly, under the authority
make your request. You may email your viticultural area to eliminate a partial
delegated to me by the Administrator,
request to: ANE-AD-AMOC@faa.gov. overlap with the Lewis-Clark Valley
the FAA amends 14 CFR part 39 as
viticultural area. The boundary
follows: (h) Related Information
modification will decrease the size of
(1) For more information about this AD, the approximately 11,370,320-acre
PART 39—AIRWORTHINESS contact Kyle Gustafson, Aerospace Engineer,
DIRECTIVES Columbia Valley viticultural area by
Engine Certification Office, FAA, Engine & approximately 57,020 acres. The Lewis-
Propeller Directorate, 1200 District Avenue, Clark Valley viticultural area is not
■ 1. The authority citation for part 39 Burlington, MA 01803; phone: 781–238–
continues to read as follows: located within and does not overlap any
7183; fax: 781–238–7199; email: kyle.
other viticultural area. TTB designates
Authority: 49 U.S.C. 106(g), 40113, 44701. gustafson@faa.gov.
viticultural areas to allow vintners to
(2) Refer to MCAI European Aviation
§ 39.13 [Amended] Safety Agency AD 2015–0213, dated October
better describe the origin of their wines
16, 2015, for more information. You may and to allow consumers to better
■ 2. The FAA amends § 39.13 by adding identify wines they may purchase.
the following new airworthiness examine the MCAI in the AD docket on the
Internet at https://www.regulations.gov/ DATES: This final rule is effective May
directive (AD):
#!documentDetail;D=FAA-2015-5539-0002. 20, 2016.
2016–08–16 Turbomeca S.A.: Amendment (3) Turbomeca S.A. Mandatory Service FOR FURTHER INFORMATION CONTACT:
39–18493; Docket No. FAA–2015–5539; Bulletin No. 292 73 2193, Version A, dated
Directorate Identifier 2015–NE–37–AD.
Karen A. Thornton, Regulations and
July 16, 2015, can be obtained from Rulings Division, Alcohol and Tobacco
(a) Effective Date Turbomeca S.A., using the contact Tax and Trade Bureau, 1310 G Street
information in paragraph (h)(4) of this AD.
This AD becomes effective May 25, 2016. NW., Box 12, Washington, DC 20005;
(4) For service information identified in
(b) Affected ADs
phone 202–453–1039, ext. 175.
this AD, contact Turbomeca S.A., 40220
Tarnos, France; phone: 33 (0)5 59 74 40 00; SUPPLEMENTARY INFORMATION:
None.
fax: 33 (0)5 59 74 45 15. Background on Viticultural Areas
(c) Applicability (5) You may view this service information
This AD applies to all Turbomeca S.A. at the FAA, Engine & Propeller Directorate, TTB Authority
Arriel 2E turboshaft engines that have a pre- 1200 District Avenue, Burlington, MA. For
TU 193 adjusted high-pressure/low-pressure Section 105(e) of the Federal Alcohol
information on the availability of this
(HP/LP) pump and metering valve assembly, Administration Act (FAA Act), 27
material at the FAA, call 781–238–7125.
installed. U.S.C. 205(e), authorizes the Secretary
(i) Material Incorporated by Reference of the Treasury to prescribe regulations
(d) Reason
None. for the labeling of wine, distilled spirits,
This AD was prompted by reports of fuel and malt beverages. The FAA Act
flow non-conformities found during Issued in Burlington, Massachusetts, on
provides that these regulations should,
Lhorne on DSK5TPTVN1PROD with RULES

acceptance tests of Arriel 2E hydro- April 12, 2016.
among other things, prohibit consumer
mechanical metering units. We are issuing Ann C. Mollica,
this AD to prevent failure of the constant deception and the use of misleading
Acting Manager, Engine & Propeller statements on labels and ensure that
delta-pressure (delta-P) diaphragm of the fuel
Directorate, Aircraft Certification Service. labels provide the consumer with
metering valve, which could result in an
uncommanded in-flight shutdown and [FR Doc. 2016–09121 Filed 4–19–16; 8:45 am] adequate information as to the identity
damage to the helicopter. BILLING CODE 4910–13–P and quality of the product. The Alcohol

VerDate Sep<11>2014 14:49 Apr 19, 2016 Jkt 238001 PO 00000 Frm 00002 Fmt 4700 Sfmt 4700 E:\FR\FM\20APR1.SGM 20APR1

Document Created: 2016-04-20 01:52:00
Document Modified: 2016-04-20 01:52:00

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 becomes effective May 25, 2016.
Contact		Kyle Gustafson, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 1200 District Avenue, Burlington, MA 01803; phone: 781-238-7183; fax: 781- 238-7199; email: [email protected]
FR Citation		81 FR 23155
RIN Number		2120-AA64
CFR Associated		Air Transportation; Aircraft; Aviation Safety; Incorporation by Reference and Safety

81 FR 23155 - Airworthiness Directives; Turbomeca S.A. Turboshaft Engines

DEPARTMENT OF TRANSPORTATIONFederal Aviation Administration

Federal Register Volume 81, Issue 76 (April 20, 2016)

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration