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(d) Subject 

Air Transport Association (ATA) of 

America Code 57, Wings. 

(e) Unsafe Condition 

This AD was prompted by reports of bolt 

rotation in the engine drag fitting joint and 

fastener heads and cracks found in the skin 

of the fastener holes, and the need to reduce 

the compliance time for certain groups. The 

FAA is issuing this AD to address cracking 

in the wing upper skin and forward drag 

fittings, which could lead to a compromised 

upper link and reduced structural integrity of 

the engine strut, and possible separation of 

a strut and engine from the airplane during 

flight. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) New Required Actions 

Except as specified by paragraph (h) of this 

AD: At the applicable times specified in the 

‘‘Compliance’’ paragraph of Boeing Alert 

Requirements Bulletin 757–57A0073 RB, 

Revision 2, dated March 1, 2021, do all 

applicable actions identified in, and in 

accordance with, the Accomplishment 

Instructions of Boeing Alert Requirements 

Bulletin 757–57A0073 RB, Revision 2, dated 

March 1, 2021. 

Note 1 to paragraph (g): Guidance for 

accomplishing the actions required by this 

AD can be found in Boeing Alert Service 

Bulletin 757–57A0073, Revision 2, dated 

March 1, 2021, which is referred to in Boeing 

Alert Requirements Bulletin 757–57A0073 

RB, Revision 2, dated March 1, 2021. 

(h) Exceptions to Service Information 

Specifications 

(1) Where Boeing Alert Requirements 

Bulletin 757–57A0073 RB, Revision 2, dated 

March 1, 2021 uses the phrase ‘‘the Original 

Issue date of Requirements Bulletin 757– 

57A0073 RB,’’ this AD requires using 

September 10, 2018 (the effective date of AD 

2018–16–05, Amendment 39–19345 (83 FR 

38250, August 6, 2018)). 

(2) Where the ‘‘Effectivity’’ paragraph and 

the Condition and Compliance Time columns 

of the tables in the ‘‘Compliance’’ paragraph 

of Boeing Alert Requirements Bulletin 757– 

57A0073 RB, Revision 2, dated March 1, 

2021, uses the phrase ‘‘the Revision 1 date of 

Requirements Bulletin 757–57A0073 RB date 

of this service bulletin,’’ this AD requires 

using January 14, 2021 (the effective date of 

AD 2020–21–17). 

(3) Where the ‘‘Effectivity’’ paragraph and 

the Condition and Compliance Time columns 

of the tables in the ‘‘Compliance’’ paragraph 

of Boeing Alert Requirements Bulletin 757– 

57A0073 RB, Revision 2, dated March 1, 

2021, uses the phrase ‘‘the Revision 2 date of 

Requirements Bulletin 757–57A0073 RB,’’ 

this AD requires using the effective date of 

this AD. 

(4) Where Boeing Alert Requirements 

Bulletin 757–57A0073 RB, Revision 2, dated 

March 1, 2021, specifies contacting Boeing 

for repair instructions: This AD requires 

doing the repair using a method approved in 

accordance with the procedures specified in 

paragraph (j) of this AD. 

(i) Credit for Previous Actions 

(1) This paragraph provides credit for the 

actions specified in paragraph (g) of this AD, 

except for the open-hole high frequency eddy 

current inspections at fastener locations 11– 

18, if those actions were performed before the 

effective date of this AD using Boeing Alert 

Requirements Bulletin 757–57A0073 RB, 

dated July 14, 2017. 

(2) This paragraph provides credit for the 

actions specified in paragraph (g) of this AD, 

if those actions were performed before the 

effective date of this AD using Boeing Alert 

Requirements Bulletin 757–57A0073 RB, 

Revision 1, dated August 1, 2019. This 

service information is not incorporated by 

reference in this AD. 

(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 responsible Flight 

Standards Office, as appropriate. If sending 

information directly to the manager of the 

certification office, send it to the attention of 

the person identified in Related Information. 

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 responsible Flight Standards 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 for AD 2020–21–17 

are approved as AMOCs for the 

corresponding provisions of Boeing Alert 

Requirements Bulletin 757–57A0073 RB, 

Revision 2, dated March 1, 2021, that are 

required by paragraph (g) of this AD. 

(k) Related Information 

(1) For more information about this AD, 

contact David Truong, Aerospace Engineer, 

Airframe Section, FAA, Los Angeles ACO 

Branch, 3960 Paramount Boulevard, 

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

5224; fax: 562–627–5210; email: 

david.truong@faa.gov. 

(2) 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. You may view this 

referenced 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. 

Issued on August 12, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–19460 Filed 9–8–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2020–1073; Project 

Identifier MCAI–2020–01303–A] 

RIN 2120–AA64 

Airworthiness Directives; Embraer S.A. 

(Type Certificate Previously Held by 

Empresa Brasileira de Aerona ́utica 

S.A.) Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to 

supersede Airworthiness Directive (AD) 

2020–12–08, which applies to all 

Embraer S.A. Model EMB–505 

airplanes. AD 2020–12–08 requires 

inspections of the mass-balance weights 

of the elevators, ailerons, and rudder 

(flight control surfaces) and their 

attachment parts, and corrective actions 

if necessary, and revising the 

airworthiness limitation section of the 

maintenance manual or instructions for 

continued airworthiness to incorporate 

new airworthiness limitations. Since AD 

2020–12–08 was issued, the FAA has 

determined that new applicable airplane 

serial numbers and new criteria for the 

replacement of affected parts must be 

required in order to address the unsafe 

condition. This proposed AD would 

retain the actions required by AD 2020– 

12–08 and would require, for certain 

airplanes, cleaning and weighing certain 

mass-balances and installation or 

replacement, as applicable; and for 

certain other mass-balances for certain 

airplanes, replacement of those massbalances. 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 October 25, 

2021. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 


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• 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 service information identified in 

this NPRM, contact Phenom 

Maintenance Support, Avenida 

Brigadeiro Faria Lima, 2170, P.O. Box 

36/2, Sa ̃o Jose ́ dos Campos, 12227–901, 

Brazil; phone: +55 12 3927 1000; email: 

phenom.reliability@embraer.com.br; 

website: https://www.embraer.com.br/ 

en-US/Pages/home.aspx. You may view 

this service information at the FAA, 

Airworthiness Products Section, 

Operational Safety Branch, 901 Locust, 

Kansas City, MO 64106. For information 

on the availability of this material at the 

FAA, call (816) 329–4148. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2020–1073; 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 MCAI, any comments 

received, and other information. The 

street address for Docket Operations is 

listed above. 

FOR FURTHER INFORMATION CONTACT: Jim 

Rutherford, Aviation Safety Engineer, 

General Aviation & Rotorcraft Section, 

International Validation Branch, 901 

Locust, Room 301, Kansas City, MO 

64106; phone: (816) 329–4165; fax: (816) 

329–4090; email: jim.rutherford@

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–2020–1073; Project Identifier 

MCAI–2020–01303–A’’ 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 Jim Rutherford, 

Aviation Safety Engineer, General 

Aviation & Rotorcraft Section, 

International Validation Branch, 901 

Locust, Room 301, Kansas City, MO 

64106. 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 2020–12–08, 

Amendment 39–21143 (85 FR 36312, 

June 16, 2020) (AD 2020–12–08), for 

Embraer S.A. (type certificate previously 

held by Empresa Brasileira de 

Aerona ́utica S.A.) Model EMB–505 

airplanes, all serial numbers. AD 2020– 

12–08 was prompted by reports of 

corrosion in the mass-balance weights of 

the flight control surfaces and a 

determination that new airworthiness 

limitations are necessary. AD 2020–12– 

08 was based on mandatory continuing 

airworthiness information (MCAI) 

issued by the Ageˆncia Nacional de 

Aviac ̧a ̃o Civil (ANAC), which is the 

aviation authority for Brazil. ANAC 

issued Brazilian Emergency AD No. 

2020–01–01, dated January 9, 2020, to 

address the unsafe condition on all 

Embraer S.A. Model EMB–505 

airplanes. 

AD 2020–12–08 requires, for certain 

serial-numbered airplanes, inspecting 

the mass-balance weights of the flight 

control surfaces and their attachment 

parts for corrosion and fragmentation, 

and corrective actions if necessary, 

including sending inspection results to 

Embraer. For all airplanes, AD 2020–12– 

08 requires revising the airworthiness 

limitation section of the maintenance 

manual or instructions for continued 

airworthiness to incorporate new 

airworthiness limitations. 

The FAA issued AD 2020–12–08 to 

address corrosion in the mass-balance 

weights of the flight control surfaces. 

The unsafe condition, if not addressed, 

could result in loss of mass or the 

detachment of the mass-balance 

weights, resulting in an unbalanced 

control surface, which could lead to 

flutter and loss of airplane control. 

Actions Since AD 2020–12–08 Was 

Issued 

Since the FAA issued AD 2020–12– 

08, ANAC superseded Brazilian 

Emergency AD No. 2020–01–01, dated 

January 9, 2020, and issued Brazilian 

AD No. 2020–09–01, dated September 8, 

2020 (referred to after this as ‘‘the 

MCAI’’). The MCAI states: 

It has been found the occurrence of 

corrosion in the mass-balance weights of the 

control surfaces. The corrosion may lead to 

loss of mass or detachment of the massbalance weights, resulting in an unbalance 

control surface, which, in conjunction with 

certain flight conditions, could lead to flutter 

and possible loss of airplane control. 

Since this condition may occur in other 

airplanes of the same type and affects flight 

safety, a corrective action is required. Thus, 

sufficient reason exists to request compliance 

with this [ANAC] AD in the indicated time 

limit. 

After [ANAC] EAD 2020–01–01 was 

released, a reassessment of the unsafe 

condition by Embraer and, subsequently, the 

SB 505–55–0004, revisions 0 and 1, dated 

March 25th, 2020 and June 24, 2020, 

respectively, expanding the list of affected 

aircraft serial numbers (S/Ns) as well as 

inserting more restrictive criteria to 

determine the replacement of affected P/Ns. 

Therefore, this [ANAC] AD retains the 

requirements of [ANAC] EAD 2020–01–01, 

which is superseded, and incorporates new 

applicable aircraft S/Ns and new criteria for 

the replacement of affected P/Ns. 

You may examine the MCAI at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2020–1073. 

Comments on AD 2020–12–08 

The FAA issued AD 2020–12–08 as a 

final rule; request for comments. The 

FAA received comments on AD 2020– 

12–08 from Flexjet LLC (Flexjet), an 

individual, and two anonymous 

commenters. 

Flexjet and an anonymous commenter 

requested that AD 2020–12–08 allow 

credit for previous actions using 


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Embraer Alert Service Bulletin SB505– 

55–A004, Revision 5, dated December 

12, 2019 (SB505–550A004 R5), as that 

service bulletin is not listed in 

paragraph (l) of AD 2020–12–08 (‘‘Credit 

for Previous Actions’’ paragraph). 

The FAA notes that the actions of AD 

2020–12–08 must be done in accordance 

with SB505–55A004 R5. Paragraph (f) of 

AD 2020–12–08 requires compliance 

‘‘unless already done.’’ Thus, AD 2020– 

12–08 already allows operators to take 

credit for using SB505–55A004 R5 if 

done before the effective date of the AD. 

Flexjet and an anonymous commenter 

requested AD 2020–12–08 include 

Embraer Service Bulletin SB505–55– 

0004, dated March 24, 2020 (SB505–55– 

0004), as this service bulletin addresses 

the worldwide fleet. 

The FAA agrees. SB505–55–0004 

includes additional actions, which are 

required by ANAC AD No. 2020–09–01, 

dated September 8, 2020. This proposed 

AD would include those additional 

requirements. 

The individual commenter noted that 

SB505–55–0004, SB505–55A004 R5, 

and Embraer Alert Service Bulletin 

SB505–55–A004, Revision 06, dated 

March 25, 2020, apply to different 

ranges of serial numbers and requested 

the FAA clarify the correct serial 

numbers for AD 2020–12–08. 

AD 2020–12–08 applies to all Model 

EMB–505 airplanes, regardless of serial 

number. However, only those airplanes 

with a serial number in SB505–55A004 

R5 are required to do the actions in 

paragraphs (h) and (k) of AD 2020–12– 

08. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Embraer Alert 

Service Bulletin SB505–55–A004, 

Revision 06, dated March 25, 2020. This 

service information specifies procedures 

for inspecting the mass-balance weights 

of the flight control surfaces and their 

respective attachment parts for 

corrosion and fragmentation, and 

performing corrective actions on certain 

serial-numbered Model EMB–505 

airplanes. Corrective actions include 

installation of a stainless steel massbalance, replacement of the massbalance, and replacement of attachment 

parts. 

The FAA also reviewed Embraer 

Service Bulletin SB505–55–0004, 

Revision 01, dated June 24, 2020. This 

service information specifies 

procedures, for certain airplanes, for 

cleaning and weighing the elevator, 

aileron, and rudder mass-balances, and 

installing or replacing the mass-balances 

(includes replacing attachment parts), as 

applicable, and for certain elevator 

mass-balances for certain airplanes, 

replacing those elevator mass-balances 

(includes replacing attachment parts). 

Embraer has also issued Alert Service 

Bulletin SB505–55–A004, Revision 5, 

dated December 12, 2019, which the 

Director of the Federal Register 

approved for incorporation by reference 

as of July 1, 2020 (85 FR 36312, June 16, 

2020). 

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 ADDRESSES. 

Other Related Service Information 

Embraer has issued Embraer Service 

Bulletin SB505–55–0004, dated March 

25, 2020. The actions specified in 

Embraer Service Bulletin SB505–55– 

0004, dated March 25, 2020, are the 

same as those specified in Embraer Alert 

Service Bulletin SB505–55–0004, 

Revision 01, dated June 24, 2020; 

however, Embraer Alert Service Bulletin 

SB505 55–0004, Revision 01, dated June 

24, 2020, was issued to add serialnumbered airplanes to the effectivity. 

No additional work is required for 

airplanes on which Embraer Service 

Bulletin SB505–55–0004, dated March 

25, 2020, has been accomplished. 

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 and service 

information described above. The FAA 

is issuing this NPRM after determining 

that the unsafe condition described 

previously is likely to exist or develop 

on other products of the same type 

design. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would retain the 

actions required by AD 2020–12–08 and 

would require, for certain airplanes, 

cleaning and weighing the elevator, 

aileron, and rudder mass-balances, and 

installation or replacement, as 

applicable of the mass-balances. This 

proposed AD would also remove the 

reporting required by AD 2020–12–08. 

For the retained requirement to revise 

the airworthiness limitations section 

(ALS) of the existing maintenance 

manual or instructions for continued 

airworthiness in paragraph (i) of this 

proposed AD, the FAA notes the 

inspection tasks are part of Chapter 5 of 

the aircraft maintenance manual—Part 

III—scheduled maintenance 

requirements. This proposed AD would 

require these tasks as new airworthiness 

limitations. 

Differences Between This Proposed AD 

and the Service Information 

Embraer Alert Service Bulletin 

SB505–55–A004, Revision 5, dated 

December 12, 2019; and Revision 06, 

dated March 25, 2020, contain 

procedures for inspecting for the 

integrity of the mass-balance weights of 

flight control surfaces and their 

attachment parts. This proposed AD 

would not include that requirement. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 392 

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 inspections from AD 

2020-12-08.

9 work-hours × $85 per hour = $765 .. $100 ...................... $865 ...................... $339,080. 

Retained ALS revision from AD 2020– 

12–08.

1 work hour × 85 per hour = $85 ........ $0 .......................... $85 ........................ $33,320. 

New cleaning, weighing, and replacement.Up to 130 work-hours × $85 per hour 

= Up to $11,050.

Up to $18,118 ....... Up to $29,168 ....... Up to $11,433,856. 


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The FAA estimates the following 

costs to do any necessary installations 

or replacements that would be required 

based on the results of the inspections 

and weighing. The FAA has no way of 

determining the number of aircraft that 

might need these actions: 

ESTIMATED COSTS OF ON-CONDITION ACTIONS

Action Labor cost Parts cost Cost per 

product 

Installation or replacement .............. Up to 129 work-hours × $85 per hour = Up to $10,965 ........................... Up to $18,118 Up to $29,083 

The FAA has included all known 

costs in this cost estimate. According to 

the manufacturer, however, some 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 that the 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 

2020–12–08, Amendment 39–21143 (85 

FR 36312, June 16, 2020); and 

■ b. Adding the following new 

airworthiness directive: 

Embraer S.A. (Type Certificate previously 

held by Empresa Brasileira de 

Aerona ́utica S.A.): Docket No. FAA– 

2020–1073; Project Identifier MCAI– 

2020–01303–A. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) action by 

October 25, 2021. 

(b) Affected ADs 

This AD replaces AD 2020–12–08, 

Amendment 39–21143 (85 FR 36312, June 

16, 2020) (AD 2020–12–08). 

(c) Applicability 

This AD applies to Embraer S.A. (type 

certificate previously held by Empresa 

Brasileira de Aerona ́utica S.A.) Model EMB– 

505 airplanes, all serial numbers, certificated 

in any category. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 5520, Elevator Structure; 5540, Rudder 

Structure; and 5751, Ailerons. 

(e) Unsafe Condition 

This AD was prompted by reports of 

corrosion in the mass-balance weights of the 

flight control surfaces and a determination 

that new airworthiness limitations are 

necessary. The FAA is issuing this AD to 

address corrosion in the mass-balance 

weights of the flight control surfaces. The 

unsafe condition, if not addressed, could 

result in loss of mass or the detachment of 

the mass-balance weights, resulting in an 

unbalanced control surface, which could lead 

to flutter and loss of airplane control. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Retained Compliance Times for the 

Actions Required by Paragraph (h) of This 

AD, With No Changes 

This paragraph restates the requirements of 

paragraph (g) of AD 2020–12–08, with no 

changes. For airplanes with a serial number 

listed in Embraer Alert Service Bulletin 

SB505–55–A004, Revision 5, dated December 

12, 2019 (SB505–55–A004R5): At the 

applicable compliance time specified in 

paragraph (g)(1), (2), or (3) of this AD, 

accomplish the actions required by paragraph 

(h) of this AD. 

(1) For airplanes with a serial number 

listed in Group 1 of Embraer Alert SB505– 

55–A004R5: Within 3 calendar days or 5 

hours time-in-service (TIS), whichever occurs 

first, after July 1, 2020 (the effective date of 

AD 2020–12–08). 

(2) For airplanes with a serial number 

listed in Group 3 of SB505–55–A004R5: 

Within 30 calendar days or 50 hours TIS, 

whichever occurs first, after July 1, 2020 (the 

effective date of AD 2020–12–08). 

(3) For airplanes with a serial number 

listed in Group 2 of SB505–55–A004R5: 

Within 60 calendar days or 100 hours TIS, 

whichever occurs first, after July 1, 2020 (the 

effective date of AD 2020–12–08). 

(h) Retained Required Actions, Without 

Reporting Requirement 

This paragraph restates the requirements of 

paragraph (h) of AD 2020–12–08, without the 

requirement to report information to 

Embraer. For airplanes with a serial number 

listed in SB505–55–A004R5, at the 

applicable time specified in paragraph (g) of 

this AD: Do the inspections identified in 

paragraphs (h)(1) through (6) of this AD and, 

before further flight, install or replace the 

mass-balance, as applicable, and replace the 

attachment parts, in accordance with Parts I 

through VI and Part VIII, as applicable, of the 

Accomplishment Instructions of SB505–55– 

A004R5; except, where the service 

information tells you to submit information 

to Embraer, this AD does not require that 

action. 

(1) Do an inspection of the elevator horn 

mass-balance weights and attachment parts 

for corrosion and fragmentation, and weigh 

each mass-balance. 


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(2) Do an inspection of the elevator internal 

mass-balance weights and attachment parts 

for corrosion and fragmentation, and weigh 

each mass-balance. You must remove and 

weigh the mass-balance weight even if there 

is no sign of corrosion or material 

fragmentation. 

(3) Do an inspection of the elevator 

adjustable mass-balance weights and 

attachment parts for corrosion and 

fragmentation, and weigh each mass-balance. 

(4) Do an inspection of the aileron massbalance weights and attachment parts for 

corrosion and fragmentation, and weigh each 

mass-balance. You must remove and weigh 

the mass-balance weight even if there is no 

sign of corrosion or material fragmentation. 

(5) Do an inspection of the rudder 

adjustable mass-balance weights and 

attachment parts for corrosion and 

fragmentation, and weigh each mass-balance. 

(6) Do an inspection of the rudder internal 

mass-balance weights and attachment parts 

for corrosion and fragmentation and, weigh 

each mass-balance. You must remove and 

weigh the mass-balance weight even if there 

is no sign of corrosion or material 

fragmentation. 

(i) Retained Revision of the Airworthiness 

Limitations Section, With No Changes 

This paragraph restates the requirements of 

paragraph (i) of AD 2020–12–08, with no 

changes. Within 10 days after July 1, 2020 

(the effective date of AD 2020–12–08), revise 

the airworthiness limitations section (ALS) of 

the existing maintenance manual or 

instructions for continued airworthiness to 

add the information in table 1 to paragraph 

(i) of this AD and the initial compliance time 

information in table 2 to paragraph (i) of this 

AD. 

BILLING CODE 4910–13–P 


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Table 1 of paragraph (i) - New Airworthiness Limitations 

Maintenance Inspection Type Inspection Title Interval 

Requirement 

55-20-04-001 General visual Internal GVI of 60 Months 

inspection (GVI) Elevator Mass- (MO) 

Balance Weight and 

Attachments 

55-20-04-002 Special detailed SDI (Borescope 60MO 

inspection (SDI) Method) of Elevator 

Mass-Balance 

Weight and 

Attachments 

55-40-04-002 GVI Internal GVI of 60MO 

Rudder Adjustable 

Mass-Balance 

Weight and 

Attachments 

55-40-04-003 SDI SDI (Borescope 60MO 

Method) of Rudder 

Fixed Mass-Balance 

Weight and 

Attachments 

57-60-00-001 Detailed visual External DET of the 60MO 

inspection (DET) Aileron 
50492 Federal Register / Vol. 86, No. 172 / Thursday, September 9, 2021 / Proposed Rules 

BILLING CODE 4910–13–C 

(j) Retained Provision: No Alternative 

Actions or Intervals, With No Changes 

This paragraph restates the requirements of 

paragraph (j) of AD 2020–12–08, with no 

changes. After the ALS has been revised as 

required by paragraph (i) of this AD, no 

alternative inspection intervals may be 

approved, except as provided in paragraph 

(p) of this AD. 

(k) New Definition 

For the purposes of this AD, ‘‘since new’’ 

is defined as since the date of issuance of the 

original airworthiness certificate or the 

original export certificate of airworthiness. 

(l) New Elevator Mass-Balance Actions 

(Groups 1, 2, and 3) 

At the applicable compliance time 

specified in paragraph (l)(1), (2), or (3) of this 

AD, clean, weigh, and, as applicable, install 

or replace the elevator mass-balances; or 

replace the elevator mass-balances; as 

applicable, in accordance with Part I of the 

Accomplishment Instructions in Embraer 

Service Bulletin SB505–55–0004, Revision 

01, dated June 24, 2020 (SB505–55– 

0004R01). Where steps (1)(d), (2)(d), and 

(3)(e) of Part I of the Accomplishment 

Instructions in SB505–55–0004R01 reference 

‘‘criteria of the PART I,’’ use the criteria in 

section 1.D. of SB505–55–0004R01. 

(1) For airplanes with a serial number 

listed as Group 1 or Group 3 in paragraphs 

1.A.(1)(a) and (c), respectively, of SB505–55– 

0004R01: Within 12 months after the 

effective date of this AD. 

(2) For airplanes with a serial number 

listed as Group 2 in paragraph 1.A.(1)(b) of 

SB505–55–0004R01, which are not included 

in the effectivity of SB505–55–A004R5 or 

Embraer Alert Service Bulletin SB505–55– 

A004, Revision 06, dated March 25, 2020 

(SB505–55–A004R06): At the applicable 

compliance time specified in paragraph 

(l)(2)(i), (ii), (iii), (iv), (v), or (vi) of this AD. 

(i) For airplanes with 12 or fewer months 

since new as of the effective date of this AD: 

Within 18 months after the effective date of 

this AD. 

(ii) For airplanes with more than 12 

months but 24 or fewer months since new as 

of the effective date of this AD: Within 12 

months after the effective date of this AD. 

(iii) For airplanes with more than 24 

months but 36 or fewer months since new as 

of the effective date of this AD: Within 9 

months after the effective date of this AD. 

(iv) For airplanes with more than 36 

months but 48 or fewer months since new as 

of the effective date of this AD: Within 7 

months after the effective date of this AD. 

(v) For airplanes with more than 48 months 

but 60 or fewer months since new as of the 

effective date of this AD: Within 6 months 

after the effective date of this AD. 

(vi) For airplanes with more than 60 

months since new as of the effective date of 

this AD: Within 5 months after the effective 

date of this AD. 

(3) For airplanes with a serial number 

listed as Group 2 in paragraph 1.A.(1)(b) of 

SB505–55–0004R01, which are included in 

the effectivity of SB505–55–A004R5 or 

SB505–55–A004R06: Before further flight. 

(m) New Aileron Mass Balance Actions 

(Groups 1 and 2) 

At the applicable compliance time 

specified in paragraph (m)(1), (2), or (3) of 

this AD, clean, weigh, and, as applicable, 

install or replace the aileron mass-balance in 

accordance with Part II of the 

Accomplishment Instructions in SB505–55– 

0004R01. Where steps (1)(c) and (2)(c) of Part 

II of the Accomplishment Instructions in 

SB505–55–0004R01 reference ‘‘criteria of the 

PART II,’’ use the criteria in section 1.D. of 

SB505–55–0004R01. 

(1) For airplanes with a serial number 

listed as Group 1 in paragraph 1.A.(2)(a) of 

SB505–55–0004R01: Within 60 months after 

the effective date of this AD. 

(2) For airplanes with a serial number 

listed as Group 2 in paragraph 1.A.(2)(b) of 

SB505–55–0004R01, which are not included 

in the effectivity of SB505–55–A004R5 or 

SB505–55–A004R06: At the applicable 

compliance time specified in paragraph 

(m)(2)(i) or (ii) of this AD. 


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Table 2 of paragraph (i) - Initial compliance time for the inspections listed in Table 1 of 

paragraph (i) of this AD 

Age of airplane on July 1, 

2020 (the effective date of 

AD 2020-12-08) 

Less than 48 MO since the 

date of issuance of the 

original airworthiness 

certificate or the original 

export certificate of 

airworthiness 

Between 48 MO and 72 MO 

since the date of issuance of 

the original airworthiness 

certificate or the original 

export certificate of 

airworthiness 

More than 72 MO since the 

date of issuance of the 

original airworthiness 

certificate or the original 

export certificate of 

airworthiness 

Initial Compliance Time for Each Inspection 

Within 60 MO after the date of issuance of the 

original airworthiness certificate or the original export 

certificate of airworthiness 

Within 12 MO after July 1, 2020 (the effective date of 

AD 2020-12-08), or within 72 MO after the date of 

issuance of the original airworthiness certificate or the 

original export certificate of airworthiness, whichever 

occurs first 

Within 30 days after July 1, 2020 (the effective date of 

AD 2020-12-08) 
Federal Register / Vol. 86, No. 172 / Thursday, September 9, 2021 / Proposed Rules 50493 

(i) For airplanes with 59 or fewer months 

since new as of the effective date of this AD: 

Within 60 months since new. 

(ii) For airplanes with more than 59 

months since new as of the effective date of 

this AD: Within 120 months since new. 

(3) For airplanes with a serial number 

listed as Group 2 in paragraph 1.A.(2)(b) of 

SB505–55–0004R01, which are included in 

the effectivity of SB505–55–A004R5 or 

SB505–55–A004R06: Before further flight. 

(n) New Rudder Mass Balance Actions 

(Groups 1 and 2) 

At the applicable compliance time 

specified in paragraph (n)(1), (2), or (3) of this 

AD, clean, weigh, and, as applicable, install 

or replace the rudder mass-balances in 

accordance with Part III of the 

Accomplishment Instructions in SB505–55– 

0004R01. Where steps (1)(c) and (2)(c) of Part 

III of the Accomplishment Instructions in 

SB505–55–0004R01 reference ‘‘criteria of the 

PART III,’’ use the criteria in section 1.D. of 

SB505–55–0004R01. 

(1) For airplanes with a serial number 

listed as Group 1 in paragraph 1.A.(3)(a) of 

SB505–55–0004R01: At the applicable 

compliance time specified in paragraph 

(n)(1)(i), (ii), or (iii) of this AD. 

(i) For airplanes with 59 or fewer months 

since new as of the effective date of this AD: 

Within 60 months since new. 

(ii) For airplanes with more than 59 

months but 119 or fewer months since new 

as of the effective date of this AD: Within 120 

months since new. 

(iii) For airplanes with more than 119 

months since new as of the effective date of 

this AD: Within 6 months after the effective 

date of this AD. 

(2) For airplanes with a serial number 

listed as Group 2 in paragraph 1.A.(3)(b) of 

SB505–55–0004R01, which are not included 

in the effectivity of SB505–55–A004R5 or 

SB505–55–A004R06: At the applicable 

compliance time specified in paragraph 

(n)(2)(i) or (ii) of this AD. 

(i) For airplanes with 59 or fewer months 

since new as of the effective date of this AD: 

Within 60 months since new. 

(ii) For airplanes with more than 59 

months since new as of the effective date of 

this AD: Within 120 months since new. 

(3) For airplanes with a serial number 

listed as Group 2 in paragraph 1.A.(3)(b) of 

SB505–55–0004R01, which are included in 

the effectivity of SB505–55–A004R5 or 

SB505–55–A004R06: Before further flight. 

(o) Credit for Previous Actions 

(1) This paragraph provides credit for the 

actions required by paragraph (h) of this AD, 

if you performed those actions before July 1, 

2020 (the effective date of AD 2020–12–08) 

using the service information specified in 

paragraphs (o)(1)(i), (ii), or (iii) of this AD. 

(i) Embraer Alert Service Bulletin SB505– 

55–A004, Revision 2, dated November 6, 

2019. 

(ii) Embraer Alert Service Bulletin SB505– 

55–A004, Revision 3, dated November 13, 

2019. 

(iii) Embraer Alert Service Bulletin SB505– 

55–A004, Revision 4, dated November 21, 

2019. 

(2) This paragraph provides credit for the 

actions required by paragraph (h) of this AD, 

if you performed those actions before the 

effective date of this AD using SB505–55– 

A004R06. 

(3) This paragraph provides credit for the 

initial inspections required by table 2 of 

paragraph (i) of this AD, if you performed 

those actions before July 1, 2020 (the 

effective date of AD 2020–12–08) using the 

service information specified in paragraphs 

(o)(3)(i), (ii), or (iii) of this AD. 

(i) Embraer Alert Service Bulletin SB505– 

55–A004, Revision 2, dated November 6, 

2019. 

(ii) Embraer Alert Service Bulletin SB505– 

55–A004, Revision 3, dated November 13, 

2019. 

(iii) Embraer Alert Service Bulletin SB505– 

55–A004, Revision 4, dated November 21, 

2019. 

(4) This paragraph provides credit for the 

initial inspections required by table 2 of 

paragraph (i) of this AD, if you performed 

those actions before the effective date of this 

AD using SB505–55–A004R5 or SB505–55– 

A004R06. 

(5) This paragraph provides credit for the 

actions required by paragraphs (l), (m), and 

(n) of this AD, if you performed those actions 

before the effective date of this AD using 

Embraer Service Bulletin SB505–55–0004, 

dated March 25, 2020. 

(p) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, General Aviation & 

Rotorcraft 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 local 

Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the General Aviation & 

Rotorcraft Section, International Validation 

Branch, send it to the attention of the person 

identified in Related Information or email: 9- 

AVS-AIR-730-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. 

(3) AMOCs approved for AD 2020–12–08 

are approved as AMOCs for the 

corresponding provisions of this AD. 

(q) Related Information 

(1) For more information about this AD, 

contact Jim Rutherford, Aviation Safety 

Engineer, General Aviation & Rotorcraft 

Section, International Validation Branch, 

FAA, 901 Locust, Room 301, Kansas City, 

MO 64106; phone: (816) 329–4165; fax: (816) 

329–4090; email: jim.rutherford@faa.gov. 

(2) Refer to Mandatory Continuing 

Airworthiness Information (MCAI) Brazilian 

AD No. 2020–09–01, dated September 8, 

2020, for related information. You may 

examine the MCAI in the AD docket at 

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

and locating Docket No. FAA–2020–1073. 

(3) For service information identified in 

this AD, contact Phenom Maintenance 

Support, Avenida Brigadeiro Faria Lima, 

2170, P.O. Box 36/2, Sa ̃o Jose ́ dos Campos, 

12227–901, Brazil; phone: +55 12 3927 1000; 

email: phenom.reliability@embraer.com.br; 

website: https://www.embraer.com.br/en-US/ 

Pages/home.aspx. You may view this service 

information at the FAA, Airworthiness 

Products Section, Operational Safety Branch, 

901 Locust, Kansas City, MO 64106. For 

information on the availability of this 

material at the FAA, call (816) 329–4148. 

Issued on August 31, 2021. 

Ross Landes, 

Deputy Director for Regulatory Operations, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–19304 Filed 9–8–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 71 

[Docket No. FAA–2021–0704; Airspace 

Docket No. 21–AWP–32] 

RIN 2120–AA66 

Proposed Amendment of United States 

Area Navigation Route Q–73 in the 

Vicinity of Twentynine Palms, CA 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: This action proposes to 

amend United States Area Navigation 

(RNAV) route Q–73 due to the creation 

of Special Activity Airspace (SAA) 

(Bristol Air Traffic Control Assigned 

Airspace (ATCAA)) in the vicinity of 

Twentynine Palms, CA. 

DATES: Comments must be received on 

or before October 25, 2021. 

ADDRESSES: Send comments on this 

proposal to the U.S. Department of 

Transportation, Docket Operations, 1200 

New Jersey Avenue SE, West Building 

Ground Floor, Room W12–140, 

Washington, DC 20590; telephone: 

1(800) 647–5527, or (202) 366–9826. 

You must identify FAA Docket No. 

FAA–2021–0704; Airspace Docket No. 

21–AWP–32 at the beginning of your 

comments. You may also submit 

comments through the internet at 

https://www.regulations.gov. 

FAA Order 7400.11E, Airspace 

Designations and Reporting Points, and 

subsequent amendments can be viewed 

online at https://www.faa.gov/air_

traffic/publications/. For further 

information, you can contact the Rules 

and Regulations Group, Federal 

Aviation Administration, 800 

Independence Avenue SW, Washington, 


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