11106 Federal Register / Vol. 86, No. 35 / Wednesday, February 24, 2021 / Rules and Regulations 

(p) 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. 

(3) The following service information was 

approved for IBR on March 31, 2021. 

(i) European Union Aviation Safety Agency 

(EASA) AD 2020–0173, dated August 5, 

2020. 

(ii) [Reserved] 

(4) The following service information was 

approved for IBR on August 26, 2019 (84 FR 

35028, July 22, 2019). 

(i) ATR ATR72 Time Limits Document, 

Revision 16, dated January 30, 2018. 

(ii) [Reserved] 

(5) For EASA AD 2020–0173, contact the 

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. 

(6) For ATR service information identified 

in this AD, contact ATR–GIE Avions de 

Transport Re ́gional, 1 Alle ́e Pierre Nadot, 

31712 Blagnac Cedex, France; telephone +33 

(0) 5 62 21 62 21; fax +33 (0) 5 62 21 67 18; 

email continued.airworthiness@atraircraft.com; internet https://www.atraircraft.com. 

(7) 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–2020–0972. 

(8) You may view this material that is 

incorporated by reference at the National 

Archives and Records Administration 

(NARA). For information on the availability 

of this material at NARA, email fedreg.legal@

nara.gov, or go to: https://www.archives.gov/ 

federal-register/cfr/ibr-locations.html. 

Issued on January 22, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–03599 Filed 2–23–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2020–1021; Project 

Identifier AD–2020–00847–T; Amendment 

39–21412; AD 2021–03–09] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for all The 

Boeing Company Model 727 series 

airplanes. This AD was prompted by a 

determination that excessive sealant 

coating on internal wing Structural 

Significant Items (SSIs) may not reveal 

cracks during inspections required by 

AD 98–11–03 R1. This AD requires 

revising the existing maintenance or 

inspection program, as applicable, to 

incorporate inspections that will give no 

less than the required damage tolerance 

rating (DTR) for certain SSIs of the wing. 

This AD also requires repetitive 

inspections for cracking of the affected 

SSIs and repair if necessary. The FAA 

is issuing this AD to address the unsafe 

condition on these products. 

DATES: This AD is effective March 31, 

2021. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of March 31, 2021. 

ADDRESSES: For service information 

identified in this final rule, contact 

Boeing Commercial Airplanes, 

Attention: Contractual & Data Services 

(C&DS), 2600 Westminster Blvd., MC 

110–SK57, Seal Beach, CA 90740–5600; 

telephone 562–797–1717; internet 

https://www.myboeingfleet.com. You 

may view this service information 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 on the internet at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2020–1021. 

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– 

1021; 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 final rule, 

any comments received, and other 

information. The 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: 

Mohit Garg, Aerospace Engineer, 

Airframe Section, FAA, Los Angeles 

ACO Branch, 3960 Paramount 

Boulevard, Lakewood, CA 90712–4137; 

phone: 562–627–5264; fax: 562–627– 

5210; email: mohit.garg@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to all The Boeing Company Model 

727 airplanes. The NPRM published in 

the Federal Register on November 27, 

2020 (85 FR 75969). The NPRM was 

prompted by a determination that 

excessive sealant coating on internal 

wing SSIs may not reveal cracks during 

inspections required by AD 98–11–03 

R1, Amendment 39–10983 (64 FR 989, 

January 7, 1999) (AD 98–11–03 R1). The 

NPRM proposed to require revising the 

existing maintenance or inspection 

program, as applicable, to incorporate 

inspections that will give no less than 

the required DTR for certain SSIs of the 

wing. The NPRM also proposed to 

require repetitive inspections for 

cracking of the affected SSIs and repair 

if necessary. 

The FAA is issuing this AD to address 

excessive sealant coating on internal 

wing SSIs that may prevent the 

detection of cracks during inspections. 

This condition, if not addressed, could 

result in propagation of structural cracks 

that could lead to the inability of a wing 

SSI to sustain limit load and result in 

loss of control of the airplane. 

Comments 

The FAA gave the public the 

opportunity to participate in developing 

this final rule. The FAA has considered 

the comment received. Boeing indicated 

its support for the NPRM. 

Conclusion 

The FAA reviewed the relevant data, 

considered the comments received, and 

determined that air safety and the 

public interest require adopting this 

final rule as proposed, except for minor 

editorial changes. The FAA has 

determined that these minor changes: 

• Are consistent with the intent that 

was proposed in the NPRM for 

addressing the unsafe condition; and 


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Federal Register / Vol. 86, No. 35 / Wednesday, February 24, 2021 / Rules and Regulations 11107 

• Do not add any additional burden 

upon the public than was already 

proposed in the NPRM. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Boeing 727 

Supplemental Structural Inspection 

Document D6–48040–1, Volume I, 

Temporary Revision 08–1001, dated 

February 2020; and Boeing 727 

Supplemental Structural Inspection 

Document D6–48040–1, Volume II, 

Temporary Revision 11–1001, dated 

February 2020. In combination, this 

service information describes repetitive 

inspections for cracking of internal wing 

SSIs. This service information 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. 

Costs of Compliance 

The FAA estimates that this AD 

affects 40 airplanes of U.S. registry. The 

FAA estimates the following costs to 

comply with this AD: 

The FAA has determined that revising 

the existing maintenance or inspection 

program takes an average of 90 workhours per operator, although the agency 

recognizes that this number may vary 

from operator to operator. In the past, 

the FAA has estimated that this action 

takes 1 work-hour per airplane. Since 

operators incorporate maintenance or 

inspection program changes for their 

affected fleet(s), the FAA has 

determined that a per-operator estimate 

is more accurate than a per-airplane 

estimate. Therefore, the FAA estimates 

the average total cost per operator to be 

$7,650 (90 work-hours × $85 per workhour). 

ESTIMATED COSTS * 

Action Labor cost Parts cost Cost per 

product Cost on U.S. operators 

Inspections ........................ 48 work-hours × $85 per hour = $4,080 per inspection cycle.$0 $4,080 per inspection 

cycle.

$163,200 per inspection 

cycle. 

* Table does not include estimated costs for revising the existing maintenance or inspection program. 

The FAA has received no definitive 

data on which to base the cost estimates 

for the on-condition repairs specified in 

this 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 

This AD will not have federalism 

implications under Executive Order 

13132. This AD will not have a 

substantial direct effect on the States, on 

the relationship between 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 that this AD: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Will not affect intrastate aviation 

in Alaska, and 

(3) Will not have a significant 

economic impact, positive or negative, 

on a substantial number of small entities 

under the criteria of the Regulatory 

Flexibility Act. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

Adoption of the Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA amends 14 CFR part 39 as 

follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

■ 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: 

2021–03–09 The Boeing Company: 

Amendment 39–21412 ; Docket No. 

FAA–2020–1021; Project Identifier AD– 

2020–00847–T. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective March 31, 2021. 

(b) Affected Airworthiness Directives (ADs) 

This AD affects AD 98–11–03 R1, 

Amendment 39–10983 (64 FR 989, January 7, 

1999) (AD 98–11–03 R1). 

(c) Applicability 

This AD applies to all The Boeing 

Company 727, 727C, 727–100, 727–100C, 

727–200, and 727–200F series airplanes, 

certificated in any category. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 57, Wings. 

(e) Unsafe Condition 

This AD was prompted by a determination 

that excessive sealant coating on internal 

wing Structural Significant Items (SSIs) may 

not reveal cracks during inspections required 

by AD 98–11–03 R1. The FAA is issuing this 

AD to address excessive sealant coating on 

internal wing SSIs that may prevent the 

detection of cracks during inspections. This 

condition, if not addressed, could result in 

propagation of structural cracks that could 

lead to the inability of a wing SSI to sustain 

limit load and result in loss of control of the 

airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Maintenance or Inspection Program 

Revision, Repetitive Inspections, and Repair 

(1) Prior to reaching the applicable time 

specified in paragraph (g)(2)(i) or (ii) of this 

AD, incorporate a revision into the existing 

maintenance or inspection program, as 

applicable, that provides no less than the 

required damage tolerance rating (DTR) for 

each SSI of the wing listed in Boeing 727 

Supplemental Structural Inspection 

Document D6–48040–1, Volume I, 

Temporary Revision 08–1001, dated February 

2020; and Boeing 727 Supplemental 


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11108 Federal Register / Vol. 86, No. 35 / Wednesday, February 24, 2021 / Rules and Regulations 

Structural Inspection Document D6–48040–1, 

Volume II, Temporary Revision 11–1001, 

dated February 2020. 

(2) At the applicable time specified in 

paragraph (g)(2)(i) or (ii) of this AD, perform 

initial inspections to detect cracks in the SSIs 

identified in Boeing 727 Supplemental 

Structural Inspection Document D6–48040–1, 

Volume I, Temporary Revision 08–1001, 

dated February 2020; and Boeing 727 

Supplemental Structural Inspection 

Document D6–48040–1, Volume II, 

Temporary Revision 11–1001, dated February 

2020. 

(i) For Model 727–100C and 727–200F 

series airplanes: Inspect prior to the 

accumulation of 46,000 total flight cycles, or 

within 12 months after the effective date of 

this AD, whichever occurs later. 

(ii) For all airplanes except for those 

airplanes identified in paragraph (g)(2)(i) of 

this AD: Inspect prior to the accumulation of 

55,000 total flight cycles, or within 3,000 

flight cycles measured from the date 12 

months after the effective date of this AD, 

whichever occurs later. 

(3) At the intervals specified in in Boeing 

727 Supplemental Structural Inspection 

Document D6–48040–1, Volume I, 

Temporary Revision 08–1001, dated February 

2020; and Boeing 727 Supplemental 

Structural Inspection Document D6–48040–1, 

Volume II, Temporary Revision 11–1001, 

dated February 2020, as applicable, repeat 

the inspections required by paragraph (g)(2) 

of this AD. 

(4) If any cracked structure is found during 

any inspections required by paragraph (g) of 

this AD, repair before further flight using an 

FAA-approved method or using a method 

approved in accordance with the procedures 

specified in paragraph (j) of this AD. Within 

12 months after repair, incorporate a revision 

into the maintenance or inspection program, 

as applicable, to include a damage-tolerancebased alternative inspection program for the 

repaired structure. Thereafter, inspect the 

affected structure in accordance with the 

alternative program. The inspection method 

and compliance times (i.e., threshold and 

repetitive intervals) of the alternative 

program must be approved in accordance 

with the procedures specified in paragraph (j) 

of this AD. 

(h) No Alternative Actions or Intervals 

After the existing maintenance or 

inspection program has been revised as 

required by paragraph (g)(1) of this AD, no 

alternative actions (e.g., inspections) or 

intervals may be used unless the actions or 

intervals are approved as an alternative 

method of compliance (AMOC) in 

accordance with the procedures specified in 

paragraph (j) of this AD. 

(i) Terminating Action for Certain 

Inspections Required by AD 98–11–03 R1 

Accomplishing the revision required by 

paragraph (g)(1) of this AD and the initial 

inspections identified in Boeing 727 

Supplemental Structural Inspection 

Document D6–48040–1, Volume I, 

Temporary Revision 08–1001, dated February 

2020; and Boeing 727 Supplemental 

Structural Inspection Document D6–48040–1, 

Volume II, Temporary Revision 11–1001, 

dated February 2020, as required by 

paragraph (g)(2) of this AD, terminate the 

corresponding SSI inspections specified in 

Boeing Document No. D6–48040–1, Volumes 

1 and 2, ‘‘Supplemental Structural Inspection 

Document’’ (SSID), Revision H, dated June 

1994, as required by AD 98–11–03 R1. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, Los Angeles ACO 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 

certification office, send it to the attention of 

the person identified in paragraph (k) 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. 

(3) An AMOC that provides an acceptable 

level of safety may be used for any repair, 

modification, or alteration required by this 

AD if it is approved by The Boeing Company 

Organization Designation Authorization 

(ODA) that has been authorized by the 

Manager, Los Angeles ACO Branch, FAA, to 

make those findings. To be approved, the 

repair method, modification deviation, or 

alteration deviation must meet the 

certification basis of the airplane, and the 

approval must specifically refer to this AD. 

(4) AMOCs approved previously for AD 

98–11–03 R1 are approved as AMOCs for the 

corresponding provisions of this AD for the 

SSIs identified in Boeing 727 Supplemental 

Structural Inspection Document D6–48040–1, 

Volume I, Temporary Revision 08–1001, 

dated February 2020; and Boeing 727 

Supplemental Structural Inspection 

Document D6–48040–1, Volume II, 

Temporary Revision 11–1001, dated February 

2020. 

(k) Related Information 

For more information about this AD, 

contact Mohit Garg, Aerospace Engineer, 

Airframe Section, FAA, Los Angeles ACO 

Branch, 3960 Paramount Boulevard, 

Lakewood, CA 90712–4137; phone: 562–627– 

5264; fax: 562–627–5210; email: mohit.garg@

faa.gov. 

(l) 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 the AD specifies otherwise. 

(i) Boeing 727 Supplemental Structural 

Inspection Document D6–48040–1, Volume I, 

Temporary Revision 08–1001, dated February 

2020. 

(ii) Boeing 727 Supplemental Structural 

Inspection Document D6–48040–1, Volume 

II, Temporary Revision 11–1001, dated 

February 2020. 

(3) For service information identified in 

this AD, contact Boeing Commercial 

Airplanes, Attention: Contractual & Data 

Services (C&DS), 2600 Westminster Blvd., 

MC 110–SK57, Seal Beach, CA 90740–5600; 

telephone 562–797–1717; internet https://

www.myboeingfleet.com. 

(4) You may view this service information 

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 service information 

that is incorporated by reference at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

email fedreg.legal@nara.gov, or go to: https:// 

www.archives.gov/federal-register/cfr/ibrlocations.html. 

Issued on January 28, 2021. 

Gaetano A. Sciortino, 

Deputy Director for Strategic Initiatives, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–03598 Filed 2–23–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2020–0859; Product 

Identifier 2020–NM–084–AD; Amendment 

39–21413; AD 2021–03–10] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc., Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Bombardier, Inc., Model BD–100–1A10 

airplanes. This AD was prompted by 

reports of failure of a certain fire 

detection and extinguishing (FIREX) 

control unit. This AD requires replacing 

FIREX control units having a certain 

part number. The FAA is issuing this 

AD to address the unsafe condition on 

these products. 

DATES: This AD is effective March 31, 

2021. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of March 31, 2021. 

ADDRESSES: For service information 

identified in this final rule, contact 

Bombardier, Inc., 200 Coˆte Vertu Road 


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