80 FR 75952 - Airworthiness Directives; General Electric Company Turbofan Engines

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration

Federal Register Volume 80, Issue 234 (December 7, 2015)

Page Range		75952-75953
FR Document		2015-30716

We propose to adopt a new airworthiness directive (AD) for all General Electric Company (GE) CF6-80C2 and CF6-80E1 turbofan engines. This proposed AD was prompted by reports of a burn-through of the accessory heat shield during an accessory compartment fire leading to an engine fire. This proposed AD would require replacing the accessory heat shield assembly. We are proposing this AD to prevent high- temperature gas ingestion into the accessory compartment, engine fire, and damage to the airplane.

Federal Register, Volume 80 Issue 234 (Monday, December 7, 2015)

[Federal Register Volume 80, Number 234 (Monday, December 7, 2015)]
[Proposed Rules]
[Pages 75952-75953]
From the Federal Register Online  [www.thefederalregister.org]
[FR Doc No: 2015-30716]


========================================================================
Proposed Rules
                                                Federal Register
________________________________________________________________________

This section of the FEDERAL REGISTER contains notices to the public of 
the proposed issuance of rules and regulations. The purpose of these 
notices is to give interested persons an opportunity to participate in 
the rule making prior to the adoption of the final rules.

========================================================================


Federal Register / Vol. 80, No. 234 / Monday, December 7, 2015 / 
Proposed Rules

[[Page 75952]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2015-4344; Directorate Identifier 2015-NE-32-AD]
RIN 2120-AA64


Airworthiness Directives; General Electric Company Turbofan 
Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: We propose to adopt a new airworthiness directive (AD) for all 
General Electric Company (GE) CF6-80C2 and CF6-80E1 turbofan engines. 
This proposed AD was prompted by reports of a burn-through of the 
accessory heat shield during an accessory compartment fire leading to 
an engine fire. This proposed AD would require replacing the accessory 
heat shield assembly. We are proposing this AD to prevent high-
temperature gas ingestion into the accessory compartment, engine fire, 
and damage to the airplane.

DATES: We must receive comments on this proposed AD by February 5, 
2016.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:
     Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: 202-493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE., Washington, DC 20590.
     Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    For service information identified in this proposed AD, contact 
General Electric Company, GE Aviation, Room 285, 1 Neumann Way, 
Cincinnati, OH 45215; phone: 513-552-3272; email: 
[email protected]. You may view this service information at 
the FAA, Engine & Propeller Directorate, 12 New England Executive Park, 
Burlington, MA. For information on the availability of this material at 
the FAA, call 781-238-7125.

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-
4344; 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 proposed AD, the regulatory evaluation, any comments 
received, and other information. The street address for the Docket 
Office (phone: 800-647-5527) is in the ADDRESSES section. Comments will 
be available in the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Herman Mak, Aerospace Engineer, Engine 
Certification Office, FAA, Engine & Propeller Directorate, 12 New 
England Executive Park, Burlington, MA 01803; phone: 781-238-7147; fax: 
781-238-7199; email: [email protected].

SUPPLEMENTARY INFORMATION: 

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this NPRM. Send your comments to an address listed 
under the ADDRESSES section. Include ``Docket No. FAA-2015-4344; 
Directorate Identifier 2015-NE-32-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of this NPRM. We will 
consider all comments received by the closing date and may amend this 
NPRM because of those comments.
    We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this NPRM.

Discussion

    We received reports of a burn-through of the accessory heat shield 
during an engine fire leading to an accessory compartment fire. A fire 
burns through the accessory heat shield and ignites the integrated 
drive generator (IDG), which supports further combustion. The existing 
accessory heat shield assembly leaves a large area above the sensitive 
accessories, such as the IDG and the main fuel pump, without adequate 
protection. A total of five events have occurred. This condition, if 
not corrected, could result in high-temperature gas ingestion into the 
accessory compartment, which could lead to engine fire and damage to 
the airplane.

Related Service Information Under 1 CFR Part 51

    We reviewed GE Service Bulletin (SB) No. CF6-80C2 S/B 72-1520, 
dated September 22, 2015 and GE SB No. CF6-80E1 S/B 72-0525, dated 
September 22, 2015. These SBs describe the procedures for removing and 
replacing the accessory heat shield assembly. This service information 
is reasonably available because the interested parties have access to 
it through their normal course of business or see ADDRESSES for other 
ways to access this service information.

Other Related Service Information

    We reviewed GE SB No. CF6-80C2 S/B 72-1523, dated September 22, 
2015. The SB describes procedures for removing and replacing the 
accessory heat shield assembly.

FAA's Determination

    We are proposing this NPRM because we evaluated all the relevant 
information and determined the unsafe condition described previously is 
likely to exist or develop in other products of the same type design.

Proposed AD Requirements

    This NPRM would require replacing the accessory heat shield 
assembly.

Costs of Compliance

    We estimate that this proposed AD affects 935 engines installed on 
airplanes of U.S. registry. We also estimate that it would take about 5 
hours per engine to comply with this proposed AD. The average labor 
rate is $85 per hour. Parts would cost about $1,832 per engine. Based 
on these figures, we estimate the total cost of this

[[Page 75953]]

proposed AD to U.S. operators to be $2,110,295.

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 proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would 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 proposed 
regulation:
    (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.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 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):

General Electric Company: Docket No. FAA-2015-4344; Directorate 
Identifier 2015-NE-32-AD.

(a) Comments Due Date

    We must receive comments by February 5, 2016.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to all General Electric Company (GE) CF6-80C2 
and CF6-80E1 turbofan engines.

(d) Unsafe Condition

    This AD was prompted by reports of a burn-through of the 
accessory heat shield during an accessory compartment fire leading 
to an engine fire. We are issuing this AD to prevent high-
temperature gas ingestion into the accessory compartment, engine 
fire, and damage to the airplane.

(e) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.
    (1) For CF6-80C2 engines, at the next engine shop visit after 
the effective date of this AD, remove from service the accessory 
heat shield assembly. Use Table 1 of GE Service Bulletin (SB) No. 
CF6-80C2 S/B 72-1520, dated September 22, 2015 to identify the part 
numbers (P/Ns) that require removal from service. Install an 
accessory heat shield assembly eligible for installation.
    (2) For CF6-80E1 engines, at the next engine shop visit after 
the effective date of this AD, remove from service the accessory 
heat shield assembly. Use Table 1 of GE SB No. CF6-80E1 S/B 72-0525, 
dated September 22, 2015 to identify the P/Ns that require removal 
from service. Install an accessory heat shield assembly eligible for 
installation.

(f) Installation Prohibition

    After the effective date of this AD, do not install any 
accessory heat shield assembly with a P/N listed in Table 1 of GE SB 
No. CF6-80C2 S/B 72-1520, dated September 22, 2015 or Table 1 of GE 
SB No. CF6-80E1 S/B 72-0525, dated September 22, 2015, into any 
engine.

(g) Definition

    For the purpose of this AD, an engine shop visit is defined as 
the induction of an engine into the shop for maintenance involving 
the separation of pairs of major mating engine flanges, except that 
the separation of engine flanges solely for the purposes of 
transportation without subsequent engine maintenance does not 
constitute an engine shop visit.

(h) Alternative Methods of Compliance (AMOCs)

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

(i) Related Information

    (1) For more information about this AD, contact Herman Mak, 
Aerospace Engineer, Engine Certification Office, FAA, Engine & 
Propeller Directorate, 12 New England Executive Park, Burlington, MA 
01803; phone: 781-238-7147; fax: 781-238-7199; email: 
[email protected].
    (2) GE SB No. CF6-80C2 S/B 72-1520, dated September 22, 2015; GE 
SB No. CF6-80C2 S/B 72-1523, dated September 22, 2015; and GE SB No. 
CF6-80E1 S/B 72-0525, dated September 22, 2015 can be obtained from 
GE using the contact information in paragraph (i)(3) of this 
proposed AD.
    (3) For service information identified in this proposed AD, 
contact General Electric Company, GE Aviation, Room 285, 1 Neumann 
Way, Cincinnati, OH 45215; phone: 513-552-3272; email: 
[email protected].
    (4) You may view this service information at the FAA, Engine & 
Propeller Directorate, 12 New England Executive Park, Burlington, 
MA. For information on the availability of this material at the FAA, 
call 781-238-7125.


    Issued in Burlington, Massachusetts, on November 25, 2015.
Colleen M. D'Alessandro,
Directorate Manager, Engine & Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 2015-30716 Filed 12-4-15; 8:45 am]
BILLING CODE 4910-13-P

75952

Proposed Rules Federal Register
Vol. 80, No. 234

Monday, December 7, 2015

This section of the FEDERAL REGISTER 285, 1 Neumann Way, Cincinnati, OH engine fire leading to an accessory
contains notices to the public of the proposed 45215; phone: 513–552–3272; email: compartment fire. A fire burns through
issuance of rules and regulations. The aviation.fleetsupport@ge.com. You may the accessory heat shield and ignites the
purpose of these notices is to give interested view this service information at the integrated drive generator (IDG), which
persons an opportunity to participate in the FAA, Engine & Propeller Directorate, 12 supports further combustion. The
rule making prior to the adoption of the final
rules.
New England Executive Park, existing accessory heat shield assembly
Burlington, MA. For information on the leaves a large area above the sensitive
availability of this material at the FAA, accessories, such as the IDG and the
DEPARTMENT OF TRANSPORTATION call 781–238–7125. main fuel pump, without adequate
protection. A total of five events have
Examining the AD Docket
Federal Aviation Administration occurred. This condition, if not
You may examine the AD docket on corrected, could result in high-
14 CFR Part 39 the Internet at http:// temperature gas ingestion into the
www.regulations.gov by searching for accessory compartment, which could
[Docket No. FAA–2015–4344; Directorate
and locating Docket No. FAA–2015– lead to engine fire and damage to the
Identifier 2015–NE–32–AD]
4344; or in person at the Docket airplane.
RIN 2120–AA64 Management Facility between 9 a.m.
and 5 p.m., Monday through Friday, Related Service Information Under 1
Airworthiness Directives; General except Federal holidays. The AD docket CFR Part 51
Electric Company Turbofan Engines contains this proposed AD, the We reviewed GE Service Bulletin (SB)
AGENCY: Federal Aviation regulatory evaluation, any comments No. CF6–80C2 S/B 72–1520, dated
Administration (FAA), DOT. received, and other information. The September 22, 2015 and GE SB No.
ACTION: Notice of proposed rulemaking
street address for the Docket Office CF6–80E1 S/B 72–0525, dated
(NPRM). (phone: 800–647–5527) is in the September 22, 2015. These SBs describe
ADDRESSES section. Comments will be the procedures for removing and
SUMMARY: We propose to adopt a new available in the AD docket shortly after replacing the accessory heat shield
airworthiness directive (AD) for all receipt. assembly. This service information is
General Electric Company (GE) CF6– FOR FURTHER INFORMATION CONTACT: reasonably available because the
80C2 and CF6–80E1 turbofan engines. Herman Mak, Aerospace Engineer, interested parties have access to it
This proposed AD was prompted by Engine Certification Office, FAA, Engine through their normal course of business
reports of a burn-through of the & Propeller Directorate, 12 New England or see ADDRESSES for other ways to
accessory heat shield during an Executive Park, Burlington, MA 01803; access this service information.
accessory compartment fire leading to phone: 781–238–7147; fax: 781–238–
an engine fire. This proposed AD would Other Related Service Information
7199; email: herman.mak@faa.gov.
require replacing the accessory heat SUPPLEMENTARY INFORMATION: We reviewed GE SB No. CF6–80C2 S/
shield assembly. We are proposing this B 72–1523, dated September 22, 2015.
AD to prevent high-temperature gas Comments Invited The SB describes procedures for
ingestion into the accessory We invite you to send any written removing and replacing the accessory
compartment, engine fire, and damage relevant data, views, or arguments about heat shield assembly.
to the airplane. this NPRM. Send your comments to an FAA’s Determination
DATES: We must receive comments on address listed under the ADDRESSES
this proposed AD by February 5, 2016. section. Include ‘‘Docket No. FAA– We are proposing this NPRM because
ADDRESSES: You may send comments, 2015–4344; Directorate Identifier 2015– we evaluated all the relevant
using the procedures found in 14 CFR NE–32–AD’’ at the beginning of your information and determined the unsafe
11.43 and 11.45, by any of the following comments. We specifically invite condition described previously is likely
methods: comments on the overall regulatory, to exist or develop in other products of
• Federal eRulemaking Portal: Go to economic, environmental, and energy the same type design.
http://www.regulations.gov. Follow the aspects of this NPRM. We will consider Proposed AD Requirements
instructions for submitting comments. all comments received by the closing
• Fax: 202–493–2251. date and may amend this NPRM This NPRM would require replacing
• Mail: U.S. Department of because of those comments. the accessory heat shield assembly.
Transportation, Docket Operations, M– We will post all comments we Costs of Compliance
30, West Building Ground Floor, Room receive, without change, to http://
W12–140, 1200 New Jersey Avenue SE., www.regulations.gov, including any We estimate that this proposed AD
jstallworth on DSK7TPTVN1PROD with PROPOSALS

Washington, DC 20590. personal information you provide. We affects 935 engines installed on
• Hand Delivery: Deliver to Mail will also post a report summarizing each airplanes of U.S. registry. We also
address above between 9 a.m. and 5 substantive verbal contact we receive estimate that it would take about 5
p.m., Monday through Friday, except about this NPRM. hours per engine to comply with this
Federal holidays. proposed AD. The average labor rate is
For service information identified in Discussion $85 per hour. Parts would cost about
this proposed AD, contact General We received reports of a burn-through $1,832 per engine. Based on these
Electric Company, GE Aviation, Room of the accessory heat shield during an figures, we estimate the total cost of this

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Federal Register / Vol. 80, No. 234 / Monday, December 7, 2015 / Proposed Rules 75953

proposed AD to U.S. operators to be PART 39—AIRWORTHINESS maintenance does not constitute an engine
$2,110,295. DIRECTIVES shop visit.

Authority for This Rulemaking (h) Alternative Methods of Compliance
■ 1. The authority citation for part 39 (AMOCs)
Title 49 of the United States Code continues to read as follows: The Manager, Engine Certification Office,
specifies the FAA’s authority to issue Authority: 49 U.S.C. 106(g), 40113, 44701. FAA, may approve AMOCs to this AD. Use
rules on aviation safety. Subtitle I, the procedures found in 14 CFR 39.19 to
§ 39.13 [Amended] make your request. You may email your
section 106, describes the authority of
the FAA Administrator. Subtitle VII: ■ 2. The FAA amends § 39.13 by adding request to: ANE-AD-AMOC@faa.gov.
Aviation Programs, describes in more the following new airworthiness (i) Related Information
detail the scope of the Agency’s directive (AD):
(1) For more information about this AD,
authority. General Electric Company: Docket No. FAA– contact Herman Mak, Aerospace Engineer,
We are issuing this rulemaking under 2015–4344; Directorate Identifier 2015– Engine Certification Office, FAA, Engine &
NE–32–AD. Propeller Directorate, 12 New England
the authority described in Subtitle VII,
Executive Park, Burlington, MA 01803;
Part A, Subpart III, Section 44701: (a) Comments Due Date
phone: 781–238–7147; fax: 781–238–7199;
‘‘General requirements.’’ Under that We must receive comments by February 5, email: herman.mak@faa.gov.
section, Congress charges the FAA with 2016. (2) GE SB No. CF6–80C2 S/B 72–1520,
promoting safe flight of civil aircraft in dated September 22, 2015; GE SB No. CF6–
(b) Affected ADs
air commerce by prescribing regulations 80C2 S/B 72–1523, dated September 22,
for practices, methods, and procedures None. 2015; and GE SB No. CF6–80E1 S/B 72–0525,
the Administrator finds necessary for (c) Applicability dated September 22, 2015 can be obtained
safety in air commerce. This regulation from GE using the contact information in
This AD applies to all General Electric paragraph (i)(3) of this proposed AD.
is within the scope of that authority Company (GE) CF6–80C2 and CF6–80E1 (3) For service information identified in
because it addresses an unsafe condition turbofan engines. this proposed AD, contact General Electric
that is likely to exist or develop on Company, GE Aviation, Room 285, 1
(d) Unsafe Condition
products identified in this rulemaking Neumann Way, Cincinnati, OH 45215;
action. This AD was prompted by reports of a phone: 513–552–3272; email:
burn-through of the accessory heat shield aviation.fleetsupport@ge.com.
Regulatory Findings during an accessory compartment fire leading (4) You may view this service information
to an engine fire. We are issuing this AD to at the FAA, Engine & Propeller Directorate,
We determined that this proposed AD prevent high-temperature gas ingestion into 12 New England Executive Park, Burlington,
would not have federalism implications the accessory compartment, engine fire, and MA. For information on the availability of
under Executive Order 13132. This damage to the airplane. this material at the FAA, call 781–238–7125.
proposed AD would not have a (e) Compliance
substantial direct effect on the States, on Issued in Burlington, Massachusetts, on
Comply with this AD within the November 25, 2015.
the relationship between the national compliance times specified, unless already
Government and the States, or on the Colleen M. D’Alessandro,
done.
distribution of power and (1) For CF6–80C2 engines, at the next Directorate Manager, Engine & Propeller
responsibilities among the various engine shop visit after the effective date of Directorate, Aircraft Certification Service.
levels of government. this AD, remove from service the accessory [FR Doc. 2015–30716 Filed 12–4–15; 8:45 am]
For the reasons discussed above, I heat shield assembly. Use Table 1 of GE BILLING CODE 4910–13–P
Service Bulletin (SB) No. CF6–80C2 S/B 72–
certify this proposed regulation:
1520, dated September 22, 2015 to identify
(1) Is not a ‘‘significant regulatory the part numbers (P/Ns) that require removal DEPARTMENT OF TRANSPORTATION
action’’ under Executive Order 12866, from service. Install an accessory heat shield
(2) Is not a ‘‘significant rule’’ under assembly eligible for installation. Office of the Secretary
(2) For CF6–80E1 engines, at the next
the DOT Regulatory Policies and engine shop visit after the effective date of
Procedures (44 FR 11034, February 26, 14 CFR Part 382
this AD, remove from service the accessory
1979), heat shield assembly. Use Table 1 of GE SB [Docket No. DOT–OST–2015–0246]
(3) Will not affect intrastate aviation No. CF6–80E1 S/B 72–0525, dated September
22, 2015 to identify the P/Ns that require RIN 2105–AE12
in Alaska to the extent that it justifies
making a regulatory distinction, and removal from service. Install an accessory
heat shield assembly eligible for installation. Nondiscrimination on the Basis of
(4) Will not have a significant Disability in Air Travel; Consideration
economic impact, positive or negative, (f) Installation Prohibition of Negotiated Rulemaking Process
on a substantial number of small entities After the effective date of this AD, do not
under the criteria of the Regulatory install any accessory heat shield assembly AGENCY: Office of the Secretary,
Flexibility Act. with a P/N listed in Table 1 of GE SB No. Department of Transportation.
CF6–80C2 S/B 72–1520, dated September 22, ACTION: Notice of intent.
List of Subjects in 14 CFR Part 39 2015 or Table 1 of GE SB No. CF6–80E1 S/
B 72–0525, dated September 22, 2015, into SUMMARY: The Department of
Air transportation, Aircraft, Aviation any engine. Transportation (‘‘Department’’ or
jstallworth on DSK7TPTVN1PROD with PROPOSALS

safety, Incorporation by reference, ‘‘DOT’’) announces that it is exploring
(g) Definition
Safety. the feasibility of conducting a
For the purpose of this AD, an engine shop negotiated rulemaking (Reg Neg)
The Proposed Amendment visit is defined as the induction of an engine
into the shop for maintenance involving the
concerning accommodations for air
Accordingly, under the authority separation of pairs of major mating engine travelers with disabilities addressing
delegated to me by the Administrator, flanges, except that the separation of engine inflight entertainment, supplemental
the FAA proposes to amend 14 CFR part flanges solely for the purposes of medical oxygen, service animals,
39 as follows: transportation without subsequent engine accessible lavatories on single-aisle

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Document Created: 2015-12-14 13:30:52
Document Modified: 2015-12-14 13:30:52

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		Proposed Rules
Action		Notice of proposed rulemaking (NPRM).
Dates		We must receive comments on this proposed AD by February 5, 2016.
Contact		Herman Mak, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; phone: 781-238-7147; fax: 781-238-7199; email: [email protected]
FR Citation		80 FR 75952
RIN Number		2120-AA64
CFR Associated		Air Transportation; Aircraft; Aviation Safety; Incorporation by Reference and Safety

80 FR 75952 - Airworthiness Directives; General Electric Company Turbofan Engines

DEPARTMENT OF TRANSPORTATIONFederal Aviation Administration

Federal Register Volume 80, Issue 234 (December 7, 2015)

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration