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.

Proposed Rules Federal Register

32653 

Vol. 86, No. 117 

Tuesday, June 22, 2021 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0506; Project 

Identifier MCAI–2021–00200–T] 

RIN 2120–AA64 

Airworthiness Directives; Airbus SAS 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to 

supersede Airworthiness Directive (AD) 

2013–25–11, which applies to all Airbus 

SAS Model A318–111, –112, –121, and 

–122 airplanes; Model A319–111, –112, 

–113, –114, –115, –131, –132, and –133 

airplanes; Model A320–111, –211, –212, 

–214, –231, –232, and –233 airplanes; 

and Model A321–111, –112, –131, –211, 

–212, –213, –231, and –232 airplanes. 

AD 2013–25–11 requires repetitive 

inspections of the 80VU rack lower 

lateral fittings, upper fittings, and 

shelves for damage, repetitive 

inspections of the 80VU rack lower 

central support for cracking, and 

corrective action if necessary. AD 2013– 

25–11 also specifies optional 

terminating action for the repetitive 

inspections. Since the FAA issued AD 

2013–25–11, new damage was reported 

on airplanes that had complied with 

certain actions in that AD. This 

proposed AD would expand the 

applicability, remove the optional 

terminating action, and require new 

repetitive inspections, 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 August 6, 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 material that will be incorporated 

by reference (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 this IBR 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. 

It is also available in the AD docket on 

the internet at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

0506. 

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–2021– 

0506; 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. 

FOR FURTHER INFORMATION CONTACT: 

Sanjay Ralhan, Aerospace Engineer, 

Large Aircraft Section, International 

Validation Branch, FAA, 2200 South 

216th St., Des Moines, WA 98198; 

telephone and fax 206–231–3223; email 

sanjay.ralhan@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–2021–0506; Project Identifier 

MCAI–2021–00200–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 the 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://

www.regulations.gov, including any 

personal information you provide. The 

agency will also post a report 

summarizing each substantive verbal 

contact received about this proposed 

AD. 

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 Sanjay Ralhan, 

Aerospace Engineer, Large Aircraft 

Section, International Validation 

Branch, FAA, 2200 South 216th St., Des 

Moines, WA 98198; telephone and fax 

206–231–3223; email sanjay.ralhan@

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 

The FAA issued AD 2013–25–11, 

Amendment 39–17707 (78 FR 78705, 

December 27, 2013) (AD 2013–25–11), 

which applies to all Airbus SAS Model 

A318–111, –112, –121, and –122 

airplanes; Model A319–111, –112, –113, 

–114, –115, –131, –132, and –133 


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airplanes; Model A320–111, –211, –212, 

–214, –231, –232, and –233 airplanes; 

and Model A321–111, –112, –131, –211, 

–212, –213, –231, and –232 airplanes. 

AD 2013–25–11 requires repetitive 

inspections of the 80VU rack lower 

lateral fittings, upper fittings, and 

shelves for damage, repetitive 

inspections of the 80VU rack lower 

central support for cracking, and 

corrective action if necessary. AD 2013– 

25–11 also specifies optional 

terminating action for the repetitive 

inspections. The FAA issued AD 2013– 

25–11 to address damage or cracking of 

the 80VU fittings and supports, which 

could lead to possible disconnection of 

the cable harnesses to one or more 

computers, and if occurring during a 

critical phase of flight, could result in 

reduced control of the airplane. 

Actions Since AD 2013–25–11 Was 

Issued 

Since the FAA issued AD 2013–25– 

11, new damage was reported on 

airplanes that had accomplished the 

actions specified in Airbus Service 

Bulletin A320–53–1215 and Airbus 

Service Bulletin A320–25–1557, which 

AD 2013–25–11 specified as optional 

terminating action for the repetitive 

inspections. Damage was also found on 

airplanes on which Airbus mod 34804 

(which provides the same modifications 

specified in Airbus Service Bulletin 

A320–53–1215 and Airbus Service 

Bulletin A320–25–1557) was embodied. 

Additional airplane models have also 

been determined to be subject to the 

unsafe condition. The FAA has 

therefore determined that new repetitive 

inspections of the 80VU rack are 

necessary to address the unsafe 

condition, and the applicability needs to 

be revised to include the additional 

airplane models. 

EASA, which is the Technical Agent 

for the Member States of the European 

Union, has issued EASA AD 2021–0045, 

dated February 16, 2021 (EASA AD 

2021–0045) (also referred to as the 

Mandatory Continuing Airworthiness 

Information, or the MCAI), to correct an 

unsafe condition for all Airbus SAS 

Model A318–111, A318–112, A319–111, 

A319–112, A319–113, A319–114, A319– 

115, A319–131, A319–132, A319–133, 

A320–211, A320–212, A320–214, A320– 

215, A320–216, A320–231, A320–232, 

A320–233, A321–111, A321–112, A321– 

131, A321–211, A321–212, A321–213, 

A321–231 and A321–232 airplanes. 

EASA AD 2021–0045 supersedes EASA 

AD 2012–0134 (which corresponds to 

FAA AD 2013–25–11). Model A320–215 

airplanes are not certificated by the FAA 

and are not included on the U.S. type 

certificate data sheet; this AD therefore 

does not include those airplanes in the 

applicability. 

This proposed AD was prompted by 

reports of damaged lower lateral fittings 

of the 80VU rack, and reports of new 

damage on airplanes on which certain 

optional service information had been 

accomplished. The FAA is proposing 

this AD to address damage or cracking 

of the 80VU fittings and supports, 

which could lead to possible 

disconnection of the cable harnesses to 

one or more computers, and if occurring 

during a critical phase of flight, could 

result in reduced control of the airplane. 

See the MCAI for additional background 

information. 

Related Service Information Under 1 

CFR Part 51 

EASA AD 2021–0045 describes 

procedures for repetitive special 

detailed inspections of the 80VU rack 

lower lateral fittings, lower central 

support, upper fittings, central post, and 

shelves attachments for discrepancies 

(including broken fittings, missing bolts, 

an electronics rack FIN 80VU that is in 

contact with structure, any bush that 

has migrated, burred material, and 

cracks), and corrective action if 

necessary. Corrective actions include 

modification, repair, and replacement. 

EASA AD 2021–0045 also describes 

procedures for reporting inspection 

results to Airbus. 

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. 

FAA’s Determination and Requirements 

of This Proposed AD 

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 the State 

of Design Authority, the FAA has been 

notified of the unsafe condition 

described in the MCAI referenced 

above. The FAA is proposing this AD 

because the FAA evaluated all pertinent 

information and determined an unsafe 

condition exists and is likely to exist or 

develop on other products of the same 

type design. 

Proposed AD Requirements 

This proposed AD would require 

accomplishing the actions specified in 

EASA AD 2021–0045 described 

previously, as incorporated by 

reference, except for any differences 

identified as exceptions in the 

regulatory text of this AD. 

Explanation of Required Compliance 

Information 

In the FAA’s ongoing efforts to 

improve the efficiency of the AD 

process, the FAA initially worked with 

Airbus and EASA to develop a process 

to use certain EASA ADs as the primary 

source of information for compliance 

with requirements for corresponding 

FAA ADs. The FAA has since 

coordinated with other manufacturers 

and civil aviation authorities (CAAs) to 

use this process. As a result, EASA AD 

2021–0045 will be incorporated by 

reference in the FAA final rule. This 

proposed AD would, therefore, require 

compliance with EASA AD 2021–0045 

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 

the EASA AD 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 the EASA AD. Service 

information specified in EASA AD 

2021–0045 that is required for 

compliance with EASA AD 2021–0045 

will be available on the internet at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0506 after the FAA final 

rule is published. 

Costs of Compliance 

The FAA estimates that this proposed 

AD affects 1,528 airplanes of U.S. 

registry. The FAA estimates the 

following costs to comply with this 

proposed AD: 

ESTIMATED COSTS FOR REQUIRED ACTIONS * 

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Retained actions from AD 2013–25– 

11.

87 work-hours × $85 per hour = 

$7,395.

$2,592 $9,987 $15,260,136 


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ESTIMATED COSTS FOR REQUIRED ACTIONS *—Continued 

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

New proposed actions ........................ Up to 8 work-hours × $85 per hour = 

Up to $680.

$0 Up to $680 Up to $1,039,040 

* Table does not include estimated costs for reporting. 

The FAA estimates that it would take 

about 1 work-hour per product to 

comply with the proposed reporting 

requirement in this proposed AD. The 

average labor rate is $85 per hour. Based 

on these figures, the FAA estimates the 

cost of reporting the inspection results 

on U.S. operators to be $129,880, or $85 

per product. 

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: 

ESTIMATED COSTS OF ON-CONDITION ACTIONS

Action Labor cost Parts cost Cost per 

product 

Repair .......................................................... 122 work-hours × $85 per hour = $10,370 ................................... $4,150 $14,520 

Replacement ............................................... Up to 189 work-hours × $85 per hour = Up to $16,065 ............... Up to $6,928 Up to $22,993 

Modification ................................................. 189 work-hours × $85 per hour = $16,065 ................................... $7,407 $23,472 

According to the manufacturer, some 

or all of the costs of this proposed AD 

may be covered under warranty, thereby 

reducing the cost impact on affected 

operators. The FAA does not control 

warranty coverage for affected operators. 

As a result, the FAA has included all 

known costs in the cost estimate. 

Paperwork Reduction Act 

A federal agency may not conduct or 

sponsor, and a person is not required to 

respond to, nor shall a person be subject 

to penalty for failure to comply with a 

collection of information subject to the 

requirements of the Paperwork 

Reduction Act unless that collection of 

information displays a current valid 

OMB control number. The control 

number for the collection of information 

required by this proposed AD is 2120– 

0056. The paperwork cost associated 

with this proposed AD has been 

detailed in the Costs of Compliance 

section of this document and includes 

time for reviewing instructions, as well 

as completing and reviewing the 

collection of information. Therefore, all 

reporting associated with this proposed 

AD is mandatory. Comments concerning 

the accuracy of this burden and 

suggestions for reducing the burden 

should be directed to Information 

Collection Clearance Officer, Federal 

Aviation Administration, 10101 

Hillwood Parkway, Fort Worth, TX 

76177–1524. 

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: 

■ a. Removing Airworthiness Directive 

(AD) 2013–25–11, Amendment 39– 

17707 (78 FR 78705, December 27, 

2013), and 

■ b. Adding the following new AD: 

Airbus SAS: Docket No. FAA–2021–0506; 

Project Identifier MCAI–2021–00200–T. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by August 6, 

2021. 

(b) Affected ADs 

This AD replaces AD 2013–25–11, 

Amendment 39–17707 (78 FR 78705, 

December 27, 2013) (AD 2013–25–11). 

(c) Applicability 

This AD applies to all Airbus SAS 

airplanes, certificated in any category, 

identified in paragraphs (c)(1) through (4) of 

this AD. 

(1) Model A318–111 and –112 airplanes. 


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(2) Model A319–111, –112, –113, –114, 

–115, –131, –132, and –133 airplanes. 

(3) Model A320–211, –212, –214, –216, 

–231, –232, and –233 airplanes. 

(4) Model A321–111, –112, –131, –211, 

–212, –213, –231, and –232 airplanes. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 25, Equipment/furnishings. 

(e) Reason 

This AD was prompted by reports of 

damaged lower lateral fittings of the 80VU 

rack, and reports of new damage on airplanes 

on which certain optional service 

information had been accomplished. The 

FAA is issuing this AD to address damage or 

cracking of the 80VU fittings and supports, 

which could lead to possible disconnection 

of the cable harnesses to one or more 

computers, and if occurring during a critical 

phase of flight, could result in reduced 

control 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, European Union Aviation 

Safety Agency (EASA) AD 2021–0045, dated 

February 16, 2021 (EASA AD 2021–0045). 

(h) Exceptions to EASA AD 2021–0045 

(1) Where EASA AD 2021–0045 refers to its 

effective date, this AD requires using the 

effective date of this AD. 

(2) The remarks section of EASA AD 2021– 

0045 does not apply to this AD. 

(3) Where paragraph (2) of EASA AD 2021– 

0045 specifies ‘‘any discrepancy,’’ for this AD 

‘‘any discrepancy’’ includes broken fittings, 

missing bolts, an electronics rack FIN 80VU 

that is in contact with structure, any bush 

that has migrated, burred material, and 

cracks. 

(4) Paragraph (4) of EASA AD 2021–0045 

specifies to report inspection results to 

Airbus within a certain compliance time. For 

this AD, report inspection results at the 

applicable time specified in paragraph 

(h)(4)(i) or (ii) of this AD. 

(i) If the inspection was done on or after 

the effective date of this AD: Submit the 

report within 90 days after the inspection. 

(ii) If the inspection was done before the 

effective date of this AD: Submit the report 

within 90 days after the effective date of this 

AD. 

(i) Other FAA AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, Large Aircraft 

Section, 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 Large Aircraft 

Section, International Validation Branch, 

send it to the attention of the person 

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

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

(i) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the responsible Flight Standards Office. 

(ii) AMOCs approved previously for AD 

2013–25–11 are approved as AMOCs for the 

corresponding provisions of EASA AD 2021– 

0045 that are required by paragraph (g) of this 

AD. 

(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, Large Aircraft Section, 

International Validation Branch, FAA; or 

EASA; or Airbus SAS’s EASA Design 

Organization Approval (DOA). If approved by 

the DOA, the approval must include the 

DOA-authorized signature. 

(3) Required for Compliance (RC): For any 

service information referenced in EASA AD 

2021–0045 that contains RC procedures and 

tests: Except as required by paragraph (i)(2) 

of this AD, RC procedures and tests must be 

done to comply with this AD; any procedures 

or tests that are not identified as RC are 

recommended. Those procedures and tests 

that are not identified as RC may be deviated 

from using accepted methods in accordance 

with the operator’s maintenance or 

inspection program without obtaining 

approval of an AMOC, provided the 

procedures and tests identified as RC can be 

done and the airplane can be put back in an 

airworthy condition. Any substitutions or 

changes to procedures or tests identified as 

RC require approval of an AMOC. 

(4) Paperwork Reduction Act Burden 

Statement: A federal agency may not conduct 

or sponsor, and a person is not required to 

respond to, nor shall a person be subject to 

a penalty for failure to comply with a 

collection of information subject to the 

requirements of the Paperwork Reduction 

Act unless that collection of information 

displays a current valid OMB Control 

Number. The OMB Control Number for this 

information collection is 2120–0056. Public 

reporting for this collection of information is 

estimated to be approximately 1 hour per 

response, including the time for reviewing 

instructions, searching existing data sources, 

gathering and maintaining the data needed, 

and completing and reviewing the collection 

of information. All responses to this 

collection of information are mandatory as 

required by this AD. Send comments 

regarding this burden estimate or any other 

aspect of this collection of information, 

including suggestions for reducing this 

burden to Information Collection Clearance 

Officer, Federal Aviation Administration, 

10101 Hillwood Parkway, Fort Worth, TX 

76177–1524. 

(j) Related Information 

(1) For information about EASA AD 2021– 

0045, 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 EASA AD on the EASA website at 

https://ad.easa.europa.eu. 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. This 

material may be found in the AD docket on 

the internet at https://www.regulations.gov 

by searching for and locating Docket No. 

FAA–2021–0506. 

(2) For more information about this AD, 

contact Sanjay Ralhan, Aerospace Engineer, 

Large Aircraft Section, International 

Validation Branch, FAA, 2200 South 216th 

St., Des Moines, WA 98198; telephone and 

fax 206–231–3223; email sanjay.ralhan@

faa.gov. 

Issued on June 15, 2021. 

Gaetano A. Sciortino, 

Deputy Director for Strategic Initiatives, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–13057 Filed 6–21–21; 8:45 am] 

BILLING CODE 4910–13–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Part 52 

[EPA–R08–OAR–2021–0262; FRL–10025– 

02–Region 8] 

Approval and Promulgation of 

Implementation Plans; Colorado; 

Revisions to Regulation Number 7; 

Aerospace, Oil and Gas, and Other 

RACT Requirements for 2008 8-Hour 

Ozone Standard for the Denver Metro/ 

North Front Range Nonattainment Area 

AGENCY: Environmental Protection 

Agency (EPA). 

ACTION: Proposed rule. 

SUMMARY: The Environmental Protection 

Agency (EPA) is proposing approval of 

State Implementation Plan (SIP) 

revisions submitted by the State of 

Colorado on May 14, 2018, May 8, 2019, 

and May 13, 2020. The revisions are to 

Colorado Air Quality Control 

Commission (Commission or AQCC) 

Regulation Number 7 (Reg. 7). The 

revisions to Reg. 7 address Colorado’s 

SIP obligation to require reasonably 

available control technology (RACT) for 

sources covered by the 2016 oil & 

natural gas control techniques 

guidelines (CTG or CTGs) for Moderate 

nonattainment areas under the 2008 

ozone National Ambient Air Quality 

Standard (NAAQS); update RACT 

requirements for major sources of 

volatile organic compounds (VOC) and 

nitrogen oxides (NOx); reorganize the 

regulation; add incorporation by 

reference dates to rules and reference 


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