84764 Federal Register / Vol. 88, No. 233 / Wednesday, December 6, 2023 / Proposed Rules 

Figure 1 to Paragraph (g)(1)—TRB Tip Cap 

Check/Inspection 

(2) Within 100 hours TIS or during the next 

100 hour or annual inspection after the 

effective date of this AD, whichever occurs 

first, and thereafter at intervals not to exceed 

100 hours TIS or during the next 100 hour 

or annual inspection, whichever occurs first, 

visually inspect each TRB tip cap area (at and 

adjacent to the tip cap bond line on each 

surface and edge of the TRB) for evidence of 

corrosion, which may be indicated by an 

exposed tip cap bond line or bubbled paint, 

as depicted in Figure 1 of paragraph (g)(1) of 

this AD. 

(3) As a result of the actions required by 

either paragraph (g)(1) or (2) of this AD, if 

there is evidence of corrosion, an exposed tip 

cap bond line, or bubbled paint, before 

further flight, remove all of the corrosion. 

Note 1 to paragraph (g)(3): Robinson 

Helicopter Company R22 Service Letter SL– 

93, R44 Service Letter SL–82, and R66 

Service Letter SL–40, each dated June 30, 

2021 (co-published as one document), 

provide information regarding removing 

corrosion from TRBs. 

(4) Within 10 months of the effective date 

of this AD, remove all TRBs identified in 

paragraph (c) of this AD from service. 

(5) As of 10 months after the effective date 

of this AD, do not install a TRB identified in 

paragraph (c) of this AD on any helicopter. 

(h) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, West Certification 

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 West Certification 

Branch, send it to the attention of the person 

identified in paragraph (i)(1) of this AD. 

Information may be emailed to: 9-ANMLAACO-AMOC-REQUESTS@faa.gov. 

(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. 

(i) Additional Information 

(1) For more information about this AD, 

contact James Guo, Aviation Safety Engineer, 

FAA, 3960 Paramount Boulevard, Lakewood, 

CA 90712; phone: (562) 627–5357; email: 

james.guo@faa.gov. 

(2) For service information identified in 

this AD that is not incorporated by reference, 

contact Robinson Helicopter Company, 

Technical Support Department, 2901 Airport 

Drive, Torrance, CA 90505; phone (310) 539– 

0508; fax (310) 539–5198; email ts1@

robinsonheli.com; or at robinsonheli.com. 

You may view this service information at the 

FAA, Office of the Regional Counsel, 

Southwest Region, 10101 Hillwood Parkway, 

Room 6N–321, Fort Worth, TX 76177. For 

information on the availability of this 

material at the FAA, call (817) 222–5110. 

(j) Material Incorporated by Reference 

None. 

Issued on November 29, 2023. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–26744 Filed 12–5–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–2230; Project 

Identifier MCAI–2023–00861–T] 

RIN 2120–AA64 

Airworthiness Directives; Deutsche 

Aircraft GmbH (Type Certificate 

Previously Held by 328 Support 

Services GmbH; AvCraft Aerospace 

GmbH; Fairchild Dornier GmbH; 

Dornier Luftfahrt GmbH) Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for all 

Deutsche Aircraft GmbH Model 328–100 

and –300 airplanes. This proposed AD 

was prompted by operator reports of 

worn and ruptured bonding straps 

inside the feeder wing tanks and in both 

outer and inner wing tanks. This 

proposed AD would require a one-time 

detailed inspection of each affected part, 

and applicable corrective actions, as 

specified in a European Union Aviation 

Safety Agency (EASA) AD, which is 

proposed for incorporation by reference 

(IBR). The FAA is proposing this AD to 

address the unsafe condition on these 

products. 

DATES: The FAA must receive comments 

on this proposed AD by January 22, 

2024. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 


lotter on DSK11XQN23PROD with PROPOSALS1EP06DE23.084</GPH>

Example: Erosion, 

exposed bond line 

Example: 81.1bbled 

paint (indicates 

underlying corrosion) 

•fa!,,_~ - - = 

Tip cap bond lme 

Tip cap bond 

line 0,30 inches 

from tip 
Federal Register / Vol. 88, No. 233 / Wednesday, December 6, 2023 / Proposed Rules 84765 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

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. 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–2230; 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 NPRM, the mandatory 

continuing airworthiness information 

(MCAI), any comments received, and 

other information. The street address for 

Docket Operations is listed above. 

Material Incorporated by Reference: 

• For EASA material that is proposed 

for IBR in this AD, contact EASA, 

Konrad-Adenauer-Ufer 3, 50668 

Cologne, Germany; telephone +49 221 

8999 000; email ADs@easa.europa.eu; 

website easa.europa.eu. You may find 

this material on the EASA website at 

ad.easa.europa.eu. It is also available at 

regulations.gov under Docket No. FAA– 

2023–2230. 

• You may view this material at the 

FAA, Airworthiness Products Section, 

Operational Safety Branch, 2200 South 

216th St., Des Moines, WA. For 

information on the availability of this 

material at the FAA, call 206–231–3195. 

FOR FURTHER INFORMATION CONTACT: 

Todd Thompson, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; 

telephone 206–231–3228; email 

Todd.Thompson@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

The FAA invites you to send any 

written relevant data, views, or 

arguments about this proposal. Send 

your comments to an address listed 

under ADDRESSES. Include ‘‘Docket No. 

FAA–2023–2230; Project Identifier 

MCAI–2023–00861–T’’ at the beginning 

of your comments. The most helpful 

comments reference a specific portion of 

the proposal, explain the reason for any 

recommended change, and include 

supporting data. The FAA will consider 

all comments received by the closing 

date and may amend this proposal 

because of those comments. 

Except for Confidential Business 

Information (CBI) as described in the 

following paragraph, and other 

information as described in 14 CFR 

11.35, the FAA will post all comments 

received, without change, to 

regulations.gov, including any personal 

information you provide. The agency 

will also post a report summarizing each 

substantive verbal contact received 

about this NPRM. 

Confidential Business Information 

CBI is commercial or financial 

information that is both customarily and 

actually treated as private by its owner. 

Under the Freedom of Information Act 

(FOIA) (5 U.S.C. 552), CBI is exempt 

from public disclosure. If your 

comments responsive to this NPRM 

contain commercial or financial 

information that is customarily treated 

as private, that you actually treat as 

private, and that is relevant or 

responsive to this NPRM, it is important 

that you clearly designate the submitted 

comments as CBI. Please mark each 

page of your submission containing CBI 

as ‘‘PROPIN.’’ The FAA will treat such 

marked submissions as confidential 

under the FOIA, and they will not be 

placed in the public docket of this 

NPRM. Submissions containing CBI 

should be sent to Todd Thompson, 

Aviation Safety Engineer, FAA, 1600 

Stewart Avenue, Suite 410, Westbury, 

NY 11590; telephone 206–231–3228; 

email Todd.Thompson@faa.gov. Any 

commentary that the FAA receives 

which is not specifically designated as 

CBI will be placed in the public docket 

for this rulemaking. 

Background 

EASA, which is the Technical Agent 

for the Member States of the European 

Union, has issued EASA AD 2023–0137, 

dated July 12, 2023 (EASA AD 2023– 

0137) (also referred to as the MCAI), to 

correct an unsafe condition for all 

Deutsche Aircraft GmbH (Type 

Certificate previously held by 328 

Support Services GmbH; AvCraft 

Aerospace GmbH; Fairchild Dornier 

GmbH; Dornier Luftfahrt GmbH) Model 

328–100 and 328–300 airplanes. The 

MCAI states that operators reported 

findings of damaged affected parts. The 

extent of the detected damage of the 

affected parts did not ensure that 

appropriately low electrical impedance 

is obtained and maintained through the 

affected bonding path. The unsafe 

condition, which if not detected and 

corrected, could lead to the loss of 

bonding function and, in combination 

with a lightning strike, create a source 

of ignition in a fuel tank, possibly 

resulting in a fire or explosion. 

The FAA is proposing this AD to 

address the unsafe condition. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2023–2230. 

Related Service Information Under 1 

CFR Part 51 

EASA AD 2023–0137 specifies 

procedures for a one-time detailed 

inspection of each affected part for worn 

and ruptured bonding straps, and 

applicable corrective actions (replacing 

the affected parts). This material is 

reasonably available because the 

interested parties have access to it 

through their normal course of business 

or by the means identified in 

ADDRESSES. 

FAA’s Determination 

This product has been approved by 

the aviation authority of another 

country and is 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 

is issuing this NPRM after determining 

that the unsafe condition described 

previously is likely to exist or develop 

in other products of the same type 

design. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

accomplishing the actions specified in 

EASA AD 2023–0137 described 

previously, except for any differences 

identified as exceptions in the 

regulatory text of this proposed AD. 

Explanation of Required Compliance 

Information 

In the FAA’s ongoing efforts to 

improve the efficiency of the AD 

process, the FAA developed a process to 

use some civil aviation authority (CAA) 

ADs as the primary source of 

information for compliance with 

requirements for corresponding FAA 

ADs. The FAA has been coordinating 

this process with manufacturers and 

CAAs. As a result, the FAA proposes to 

incorporate EASA AD 2023–0137 by 

reference in the FAA final rule. This 

proposed AD would, therefore, require 

compliance with EASA AD 2023–0137 

in its entirety through that 

incorporation, except for any differences 

identified as exceptions in the 

regulatory text of this proposed AD. 

Using common terms that are the same 

as the heading of a particular section in 

EASA AD 2023–0137 does not mean 

that operators need to comply only with 

that section. For example, where the AD 

requirement refers to ‘‘all required 

actions and compliance times,’’ 


lotter on DSK11XQN23PROD with PROPOSALS1
84766 Federal Register / Vol. 88, No. 233 / Wednesday, December 6, 2023 / Proposed Rules 

compliance with this AD requirement is 

not limited to the section titled 

‘‘Required Action(s) and Compliance 

Time(s)’’ in EASA AD 2023–0137. 

Service information required by EASA 

AD 2023–0137 for compliance will be 

available at regulations.gov under 

Docket No. FAA–2023–2230 after the 

FAA final rule is published. 

Interim Action 

The FAA considers that this proposed 

AD would be an interim action. If final 

action is later identified, the FAA might 

consider further rulemaking then. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 35 

airplanes of U.S. registry. The FAA 

estimates the following costs to comply 

with this proposed AD: 

ESTIMATED COSTS FOR REQUIRED ACTIONS

Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

44 work-hours × $85 per hour = $3,740 ..................................................................................... $0 $3,740 $130,900 

The FAA estimates the following 

costs to do any necessary on-condition 

actions that would be required based on 

the results of any required actions. The 

FAA has no way of determining the 

number of aircraft that might need these 

on-condition actions: 

The FAA has received no definitive 

data on which to base the cost estimates 

for the on-condition actions specified in 

this proposed AD. 

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 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) Would not affect intrastate 

aviation in Alaska, and 

(3) Would 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 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

Deutsche Aircraft GmbH (Type Certificate 

Previously Held by 328 Support Services 

GmbH; AvCraft Aerospace GmbH; 

Fairchild Dornier GmbH; Dornier 

Luftfahrt GmbH): Docket No. FAA– 

2023–2230; Project Identifier MCAI– 

2023–00861–T. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by January 22, 

2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to all Deutsche Aircraft 

GmbH (Type Certificate previously held by 

328 Support Services GmbH; AvCraft 

Aerospace GmbH; Fairchild Dornier GmbH; 

Dornier Luftfahrt GmbH) Model 328–100 and 

328–300 airplanes, certificated in any 

category. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 28, Fuel. 

(e) Unsafe Condition 

This AD was prompted by operator reports 

of worn and ruptured bonding straps inside 

the feeder wing tanks and in both outer and 

inner wing tanks. The FAA is issuing this AD 

to address damaged bonding straps. The 

unsafe condition, if not addressed, could 

result in the loss of bonding function and, in 

combination with a lightning strike, create a 

source of ignition in a fuel tank, possibly 

resulting in a fire or explosion and 

consequent loss of the airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Requirements 

Except as specified in paragraph (h) of this 

AD: Comply with all required actions and 

compliance times specified in, and in 

accordance with, EASA AD 2023–0137, 

dated July 12, 2023 (EASA AD 2023–0137). 

(h) Exceptions to EASA AD 2023–0137 

(1) Where EASA AD 2023–0137 refers to its 

effective date, this AD requires using the 

effective date of this AD. 

(2) This AD does not adopt the ‘‘Remarks’’ 

section of EASA AD 2023–0137. 

(3) Where paragraph (2) of EASA AD 2023– 

0137 specifies if ‘‘any damage is detected as 

defined in the ASB,’’ this AD requires 

replacing those words with ‘‘any worn or 

ruptured bonding strap is detected.’’ 

(i) Additional AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Validation 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 

responsible Flight Standards Office, as 

appropriate. If sending information directly 

to the manager of the International Validation 

Branch, mail it to the address identified in 

paragraph (j) of this AD. Information may be 

emailed to: 9-AVS-AIR-730-AMOC@faa.gov. 

Before using any approved AMOC, notify 


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Federal Register / Vol. 88, No. 233 / Wednesday, December 6, 2023 / Proposed Rules 84767 

your appropriate principal inspector, or 

lacking a principal inspector, the manager of 

the responsible Flight Standards Office. 

(2) Contacting the Manufacturer: For any 

requirement in this AD to obtain instructions 

from a manufacturer, the instructions must 

be accomplished using a method approved 

by the Manager, International Validation 

Branch, FAA; or EASA; or Deutsche Aircraft 

GmbH’s EASA Design Organization Approval 

(DOA). If approved by the DOA, the approval 

must include the DOA-authorized signature. 

(j) Additional Information 

For more information about this AD, 

contact Todd Thompson, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 206– 

231–3228; email Todd.Thompson@faa.gov. 

(k) 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 this AD specifies otherwise. 

(i) European Union Aviation Safety Agency 

(EASA) AD 2023–0137, dated July 12, 2023. 

(ii) [Reserved] 

(3) For EASA AD 2023–0137, contact 

EASA, Konrad-Adenauer-Ufer 3, 50668 

Cologne, Germany; telephone +49 221 8999 

000; email ADs@easa.europa.eu; website 

easa.europa.eu. You may find this EASA AD 

on the EASA website at ad.easa.europa.eu. 

(4) You may view this material at the FAA, 

Airworthiness Products Section, Operational 

Safety Branch, 2200 South 216th St., Des 

Moines, WA. For information on the 

availability of this material at the FAA, call 

206–231–3195. 

(5) You may view this material at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

visit www.archives.gov/federal-register/cfr/ 

ibr-locations or email fr.inspection@nara.gov. 

Issued on November 29, 2023. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–26664 Filed 12–5–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–2231; Project 

Identifier MCAI–2022–01623–R] 

RIN 2120–AA64 

Airworthiness Directives; Leonardo 

S.p.a. Helicopters 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for all 

Leonardo S.p.a. Model AB412 and 

AB412 EP helicopters. This proposed 

AD was prompted by reports of cracks 

in the lateral mounts of the main 

transmission support case. This 

proposed AD would require repetitive 

visual inspections and fluorescent 

penetrant inspections (FPI) and, 

depending on the results, corrective 

action, as specified in a European Union 

Aviation Safety Agency (EASA) AD, 

which is proposed for incorporation by 

reference. The FAA is proposing this 

AD to address the unsafe condition on 

these products. 

DATES: The FAA must receive comments 

on this proposed AD by January 22, 

2024. 

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 

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. 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–2231; 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 NPRM, any comments 

received, and other information. The 

street address for Docket Operations is 

listed above. 

Material Incorporated by Reference: 

• For EASA material that is identified 

in this NPRM, contact KonradAdenauer-Ufer 3, 50668 Cologne, 

Germany; telephone +49 221 8999 000; 

email Ads@easa.europa.eu; internet 

easa.europa.eu. You may find the EASA 

material on the EASA website 

ad.easa.europa.eu. 

• You may view this material at the 

FAA, Office of the Regional Counsel, 

Southwest Region, 10101 Hillwood 

Parkway, Room 6N–321, Fort Worth, TX 

76177. For information on the 

availability of this material at the FAA, 

call (817) 222–5110. The EASA material 

is also available at regulations.gov under 

Docket No. FAA–2023–2231. 

Other Related Service Information: 

For Bell Helicopter service information 

identified in this NPRM, contact Bell 

Textron, Inc., P.O. Box 482, Fort Worth, 

TX 76101; phone 1–450–437–2862 or 1– 

800–363–8023; fax 1–450–433–0272; 

email productsupport@bellflight.com; or 

at bellflight.com/support/contactsupport. 

FOR FURTHER INFORMATION CONTACT: 

Sungmo Cho, Aviation Safety Engineer, 

FAA, 1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; phone: (781) 238– 

7241; email: sungmo.d.cho@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

The FAA invites you to send any 

written relevant data, views, or 

arguments about this proposal. Send 

your comments to an address listed 

under ADDRESSES. Include ‘‘Docket No. 

FAA–2023–2231; Project Identifier 

MCAI–2022–01623–R’’ at the beginning 

of your comments. The most helpful 

comments reference a specific portion of 

the proposal, explain the reason for any 

recommended change, and include 

supporting data. The FAA will consider 

all comments received by the closing 

date and may amend this proposal 

because of those comments. 

Except for Confidential Business 

Information (CBI) as described in the 

following paragraph, and other 

information as described in 14 CFR 

11.35, the FAA will post all comments 

received, without change, to 

regulations.gov, including any personal 

information you provide. The agency 

will also post a report summarizing each 

substantive verbal contact received 

about this NPRM. 

Confidential Business Information 

CBI is commercial or financial 

information that is both customarily and 

actually treated as private by its owner. 

Under the Freedom of Information Act 

(FOIA) (5 U.S.C. 552), CBI is exempt 

from public disclosure. If your 

comments responsive to this NPRM 

contain commercial or financial 

information that is customarily treated 

as private, that you actually treat as 

private, and that is relevant or 

responsive to this NPRM, it is important 

that you clearly designate the submitted 

comments as CBI. Please mark each 

page of your submission containing CBI 

as ‘‘PROPIN.’’ The FAA will treat such 

marked submissions as confidential 

under the FOIA, and they will not be 

placed in the public docket of this 

NPRM. Submissions containing CBI 

should be sent to Sungmo Cho, Aviation 

Safety Engineer, FAA, 1600 Stewart 

Avenue, Suite 410, Westbury, NY 


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