Federal Register / Vol. 86, No. 119 / Thursday, June 24, 2021 / Proposed Rules 33149 

List of Subjects in 14 CFR Part 25 

Aircraft, Aviation safety, Reporting 

and recordkeeping requirements. 

Authority Citation 

The authority citation for these 

special conditions is as follows: 

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

44701, 44702, 44704. 

The Proposed Special Conditions 

Accordingly, the Federal Aviation 

Administration (FAA) proposes the 

following special conditions as part of 

the type certification basis for the 

Bombardier Model CL–600–2B16 

airplane with the LAIRCM system, as 

modified by Pro Star Aviation. 

1. The system must have means that 

prevent the inadvertent activation of the 

system on the ground, including during 

airplane maintenance and ground 

handling. Such means must address all 

foreseeable failure modes and operating 

and maintenance errors. 

2. The system must be designed so 

that its operation in-flight does not 

result in damage to the airplane or other 

aircraft, or injury to any person. 

Operation of the system must not be 

capable of compromising continued safe 

flight and landing of other aircraft and 

the airplane on which it is installed, 

either by direct damage, laser-reflective 

damage, or through distraction or 

incapacitation of crew. 

3. Laser-safety information for 

maintaining or servicing the airplane 

must be prominently placarded on the 

airplane or LAIRCM system at the 

location of the laser installation. 

4. Instructions for continued 

airworthiness for installation, removal, 

and maintenance of the LAIRCM system 

must contain warnings appropriate to 

the laser classification concerning the 

hazards associated with exposure to 

laser radiation. This includes 

instructions regarding potential hazards 

to personnel who are using optical 

magnification devices such as 

magnifying glasses or binoculars. 

5. The airplane flight manual 

supplement (AFMS) must describe the 

intended functions of the installed laser 

systems, to include identifying the 

intended operations and phases of 

flight. The AFMS must state, 

‘‘CAUTION: The operation of the 

installed laser system could pose 

significant risk of injury to others while 

in proximity to other aircraft, airports, 

and populated areas.’’ 

Issued in Kansas City, Missouri, on June 

14, 2021. 

Patrick R. Mullen, 

Manager, Technical Innovation Policy 

Branch, Policy and Innovation Division, 

Aircraft Certification Service. 

[FR Doc. 2021–12833 Filed 6–23–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0507; Project 

Identifier 2018–SW–117–AD] 

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 

certain Leonardo S.p.a. Model AB139 

and Model AW139 helicopters. This 

proposed AD was prompted by a report 

that, during a post-flight inspection of 

an in-service helicopter, a tail rotor 

slider assembly was found fractured, 

and the bushing and the actuator rod in 

the tail rotor servo were partially 

damaged. This proposed AD would 

require an inspection of the tail rotor 

slider assembly for corrosion and signs 

of circumferential refinishing and, 

depending on the findings, replacement 

of the tail rotor slider assembly with a 

serviceable part or repetitive inspections 

of the of the tail rotor slider assembly 

for corrosion and signs of 

circumferential refinishing, as specified 

in a European Aviation Safety Agency 

(now 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 August 9, 2021. 

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 

https://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 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; 

internet www.easa.europa.eu. You may 

find this IBR material on the EASA 

website at https://ad.easa.europa.eu. 

You may view the EASA material at the 

FAA, Office of the Regional Counsel, 

Southwest Region, 10101 Hillwood 

Pkwy., Room 6N–321, Fort Worth, TX 

76177. For information on the 

availability of the EASA material at the 

FAA, call (817) 222–5110. The EASA 

material is also available at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

0507. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0507; 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 EASA AD, any comments 

received, and other information. The 

street address for Docket Operations is 

listed above. 

FOR FURTHER INFORMATION CONTACT: 

Andrea Jimenez, Aerospace Engineer, 

COS Program Management Section, 

Operational Safety Branch, Compliance 

& Airworthiness Division, FAA, 1600 

Stewart Ave., Suite 410, Westbury, NY 

11590; telephone (516) 228–7330; email 

andrea.jimenez@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–2021–0507; Project Identifier 

2018–SW–117–AD’’ 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 https:// 


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33150 Federal Register / Vol. 86, No. 119 / Thursday, June 24, 2021 / Proposed Rules 

www.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 Andrea Jimenez, 

Aerospace Engineer, COS Program 

Management Section, Operational 

Safety Branch, Compliance & 

Airworthiness Division, FAA, 1600 

Stewart Ave., Suite 410, Westbury, NY 

11590; telephone (516) 228–7330; email 

andrea.jimenez@faa.gov. Any 

commentary that the FAA receives that 

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 2018–0292, 

dated December 28, 2018 (EASA AD 

2018–0292) to correct an unsafe 

condition for Leonardo S.p.A. (formerly 

Finmeccanica S.p.A, AgustaWestland 

S.p.A., Agusta S.p.A.; AgustaWestland 

Philadelphia Corporation, formerly 

Agusta Aerospace Corporation) Model 

AB139 and Model AW139 helicopters, 

all serial numbers. Although EASA AD 

2018–0292 applies to all Model AB139 

and Model AW139 helicopters, this 

proposed AD would apply to 

helicopters with an affected part 

installed instead. 

This proposed AD was prompted by 

a report that, during a post-flight 

inspection of an in-service helicopter, a 

tail rotor slider assembly was found 

fractured, and the bushing and the 

actuator rod in the tail rotor servo were 

partially damaged. The subsequent 

investigation revealed that the failure 

was due to fatigue, initiated from 

corroded areas (corrosion craters) on the 

surface of the tail rotor slider assembly 

characterized by signs of circumferential 

refinishing. The corrosion craters 

originated along finishing signs 

consistent with low grit sanding 

operations, which can remove the 

passivation corrosion protection from 

the tail rotor slider assembly. Sanding is 

a maintenance activity that is not 

included in the maintenance manual for 

Leonardo S.p.a. Model AB139 and 

AW139 helicopters and is not allowed 

on in-service helicopters. The FAA is 

proposing this AD to address corrosion 

in the tail rotor slider assembly caused 

by improper refinishing (characterized 

by signs of circumferential refinishing 

consistent with sanding). The unsafe 

condition, if not addressed, could result 

in fatigue cracks and fracture of the tail 

rotor slider assembly, resulting in 

failure of the tail rotor controls and 

consequent loss of yaw control of the 

helicopter. See EASA AD 2018–0292 for 

additional background information. 

FAA’s Determination and Requirements 

of This Proposed AD 

These helicopters have been approved 

by EASA and are approved for operation 

in the United States. Pursuant to the 

FAA’s bilateral agreement with the 

European Union, EASA has notified the 

FAA about the unsafe condition 

described in its AD. The FAA is 

proposing this AD after evaluating all 

known relevant information and 

determining that the unsafe condition 

described previously is likely to exist or 

develop on other helicopters of these 

same type designs. 

Related Service Information Under 1 

CFR Part 51 

EASA AD 2018–0292 requires a 

detailed inspection of the tail rotor slide 

assembly for corrosion and signs of 

circumferential refinishing and, 

depending on the findings, applicable 

corrective actions. If there is any 

evidence of corrosion craters the 

corrective action is replacement of the 

affected part with a serviceable part. If 

there is any evidence of surface 

imperfections caused by circumferential 

refinishing but no evidence of corrosion, 

the corrective action is repetitive 

inspections of the tail rotor slide 

assembly for corrosion and signs of 

circumferential refinishing. 

Replacement of an affected part with a 

serviceable part is terminating action for 

the repetitive inspections. 

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 the ADDRESSES section. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

accomplishing the actions specified in 

EASA AD 2018–0292, described 

previously, as incorporated by 

reference, 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 certain 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, EASA AD 2018–0292 

will be incorporated by reference in the 

FAA final rule. This proposed AD 

would, therefore, require compliance 

with EASA AD 2018–0292 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 2018– 

0292 does not mean that operators need 

comply only with that section. For 

example, where the AD requirement 

refers to ‘‘all required actions and 

compliance times,’’ compliance with 

this AD requirement is not limited to 

the section titled ‘‘Required Action(s) 

and Compliance Time(s)’’ in EASA AD 

2018–0292. Service information 

specified in EASA AD 2018–0292 that is 

required for compliance with it will be 

available at https://www.regulations.gov 

by searching for and locating Docket No. 

FAA–2021–0507 after the FAA final 

rule is published. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 129 

helicopters of U.S. Registry. The FAA 

estimates the following costs to comply 

with this proposed AD. 


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Federal Register / Vol. 86, No. 119 / Thursday, June 24, 2021 / Proposed Rules 33151 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Inspection ................... 1 work-hour × $85 per hour = $85 ...................................................... $0 $85 $10,965 

The FAA estimates the following 

costs to do any necessary replacement 

that would be required based on the 

results of the proposed inspection. The 

agency has no way of determining the 

number of aircraft that might need this 

replacement: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per product 

Replacement .............. Up to 10 work-hours × $85 per hour = $850 .................................... $23,200 Up to $24,050. 

Inspection ................... 1 work-hour × $85 per hour = $85 per inspection cycle .................. $0 $85 per inspection cycle. 

The FAA has included all known 

costs in its cost estimate. According to 

the manufacturer, however, some or all 

of the costs of this proposed AD may be 

covered under warranty, thereby 

reducing the cost impact on affected 

operators. 

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: 

Leonardo S.p.a.: Docket No. FAA–2021– 

0507; Project Identifier 2018–SW–117– 

AD. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by August 9, 

2021. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Leonardo S.p.a. Model 

AB139 and AW139 helicopters, certificated 

in any category, with an affected part as 

identified in European Aviation Safety 

Agency (now European Union Safety 

Agency) (EASA) AD 2018–0292, dated 

December 28, 2018 (EASA AD 2018–0292). 

(d) Subject 

Joint Aircraft Service Component (JASC) 

Code: 6400, Tail Rotor System. 

(e) Unsafe Condition 

This AD was prompted by a report that, 

during a post-flight inspection of an inservice helicopter, a tail rotor slider assembly 

was found fractured, and the bushing and the 

actuator rod in the tail rotor servo were 

partially damaged. The FAA is proposing this 

AD to address corrosion in the tail rotor 

slider assembly caused by improper 

refinishing (characterized by signs of 

circumferential refinishing consistent with 

sanding). The unsafe condition, if not 

addressed, could result in fatigue cracks and 

fracture of the tail rotor slider assembly, 

resulting in failure of the tail rotor controls 

and consequent loss of yaw control of the 

helicopter. 

(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 2018–0292. 

(h) Exceptions to EASA AD 2018–0292 

(1) Where EASA AD 2018–0292 refers to 

flight hours (FH), this AD requires using 

hours time-in-service. 

(2) Where EASA AD 2018–0292 refers to its 

effective date, this AD requires using the 

effective date of this AD. 

(3) Where EASA AD 2018–0292 refers to 

‘‘Part I of the ASB,’’ this AD requires using 

‘‘Part I of section 3., Accomplishment 

Instructions of the ASB,’’ and where EASA 

AD 2018–0292 refers to ‘‘Part II of the ASB,’’ 

this AD requires using ‘‘Part II of section 3., 

Accomplishment Instructions of the ASB.’’. 

(4) Where the service information referred 

to in EASA AD 2018–0292 specifies to return 

certain parts, this AD does not include that 

requirement. 

(5) Where the service information referred 

to in EASA AD 2018–0292 specifies to 

contact Leonardo S.p.a. ‘‘if in doubt’’ 

regarding if a tail rotor slider assembly needs 


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33152 Federal Register / Vol. 86, No. 119 / Thursday, June 24, 2021 / Proposed Rules 

to be replaced based on evidence of corrosion 

craters, replacement of an affected slider 

assembly is required by this AD but 

contacting Leonardo S.p.a. is not required by 

this AD. 

(6) The ‘‘Remarks’’ section of EASA AD 

2018–0292 does not apply to this AD. 

(i) No Reporting Requirement 

Although the service information 

referenced in EASA AD 2018–0292 specifies 

to submit certain information to the 

manufacturer, this AD does not include that 

requirement. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) 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 local 

Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the International Validation 

Branch, send it to the attention of the person 

identified in paragraph (k)(2) of this AD. 

Information may be emailed to: 9-AVS-AIR730-AMOC@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. 

(k) Related Information 

(1) For EASA AD 2018–0292, contact 

EASA, Konrad-Adenauer-Ufer 3, 50668 

Cologne, Germany; telephone +49 221 8999 

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

www.easa.europa.eu. You may view this 

material at the FAA, Office of the Regional 

Counsel, Southwest Region, 10101 Hillwood 

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

For information on the availability of this 

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

This material may be found in the AD docket 

at https://www.regulations.gov by searching 

for and locating Docket No. FAA–2021–0507. 

(2) For more information about this AD, 

contact Andrea Jimenez, Aerospace Engineer, 

COS Program Management Section, 

Operational Safety Branch, Compliance & 

Airworthiness Division, FAA, 1600 Stewart 

Ave., Suite 410, Westbury, NY 11590; 

telephone (516) 228–7330; email 

andrea.jimenez@faa.gov. 

Issued on June 16, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–13130 Filed 6–23–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2020–0089; Project 

Identifier 2019–NM–159–AD] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Proposed rule; withdrawal. 

SUMMARY: The FAA is withdrawing a 

notice of proposed rulemaking (NPRM) 

that proposed to adopt a new 

airworthiness directive (AD). That 

NPRM would have applied to certain 

The Boeing Company Model 737–700, 

–800, and –900ER series airplanes. The 

NPRM was prompted by a report of 

unshimmed gaps at a certain frame 

inner chord. The NPRM would have 

required a general visual inspection for 

repairs of a certain frame inner chord, 

a detailed inspection for unshimmed 

gaps of the frame inner chord, and 

applicable on-condition actions. Since 

issuance of the NPRM, the FAA 

determined that the proposed AD is 

inadequate to address the unsafe 

condition. The FAA intends to propose 

new rulemaking to incorporate changes 

to the proposed requirements and add 

airplanes that are also subject to the 

unsafe condition. Accordingly, the 

NPRM is withdrawn. 

DATES: The FAA is withdrawing the 

proposed rule published on February 4, 

2020 (85 FR 6107), as of June 24, 2021. 

ADDRESSES: 

Examining the AD Docket 

You may examine the AD docket on 

the internet at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2020– 

0089; 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 AD action, 

any comments received, and other 

information. The street address for 

Docket Operations is U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

FOR FURTHER INFORMATION CONTACT: Greg 

Rutar, Aerospace Engineer, Airframe 

Section, FAA, Seattle ACO Branch, 2200 

South 216th St., Des Moines, WA 98198; 

phone and fax: 206–231–3529; email: 

Greg.Rutar@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued an NPRM that 

proposed to amend 14 CFR part 39 by 

adding an AD that would apply to 

certain Boeing Model 737–700, –800, 

and –900ER series airplanes. The NPRM 

was published in the Federal Register 

on February 4, 2020 (85 FR 6107). The 

NPRM was prompted by a report of 

unshimmed gaps at a certain frame 

inner chord. 

The NPRM proposed to require a 

general visual inspection for repairs of 

a certain frame inner chord, a detailed 

inspection for unshimmed gaps of the 

frame inner chord, and applicable oncondition actions. The proposed actions 

were intended to address gaps at a frame 

inner chord, which may initiate early 

cracking in fatigue critical baseline 

structure (FCBS) and result in the 

inability of a principal structural 

element (PSE) to sustain limit load and 

adversely affect the structural integrity 

of the airplane. 

Actions Since the NPRM Was Issued 

Since issuance of the NPRM, the FAA 

determined that the proposed actions 

are inadequate to address the unsafe 

condition. In addition to identifying 

missing shims, Boeing has found a 

wrong type of shims, shanked fasteners, 

fastener head gaps, and incorrect 

fastener hole sizes. The unsafe 

condition and location of the problem 

are the same as those described in the 

NPRM. The FAA has identified 

additional Model 737–700, –800, and 

–900ER airplanes as well as additional 

airplane models that are subject to the 

unsafe condition. The FAA has also 

determined that additional actions must 

be accomplished to address the unsafe 

condition on the affected airplanes. In 

light of these changes, the FAA intends 

to propose further rulemaking. 

Withdrawal of the NPRM constitutes 

only such action. The withdrawal does 

not preclude the FAA from further 

rulemaking on this issue or commit the 

FAA to any course of action in the 

future. 

Comments 

The FAA received comments on the 

NPRM from four commenters, including 

Aviation Partners Boeing, Boeing, Delta 

Air Lines, and United Airlines. 

Although the FAA is withdrawing the 

NPRM because of new findings and not 

as a result of any of these comments, the 

following presents a brief discussion of 

the comments. 

United Airlines concurred with the 

NPRM. 

Aviation Partners Boeing and Delta 

Air Lines stated that the incorporation 


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