DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2021-0253; Project Identifier MCAI-2021-00220-T;
Amendment 39-21491; AD 2021-07-14]
Airworthiness Directives; Yabora Industria
Aeronautica S.A. (Type Certificate Previously Held by Embraer
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule; request for comments.
SUMMARY: The FAA is adopting a new airworthiness directive (AD)
Yabora Industria Aeronautica S.A. Model EMB-135
and EMB-145 airplanes. This AD was prompted by a report involving
disconnection of a side arm strut from the right main landing gear
(MLG); a subsequent investigation found that the side arm strut lower
bearing was installed inverted on the airplane. This AD requires doing
a general visual inspection of the right and left MLG to verify certain
conditions and doing all applicable on-condition actions, as specified
in an Ag[ecirc]ncia Nacional de Avia[ccedil]ao Civil (ANAC) AD,
which is incorporated by reference. The FAA is issuing this AD to
address the unsafe condition on these products.
DATES: This AD becomes effective April 20, 2021.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of April 20,
The FAA must receive comments on this AD by May 20, 2021.
ADDRESSES: You may send comments, using the procedures found in
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.
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 incorporated by reference (IBR) in this AD, contact
the National Civil Aviation Agency (ANAC), Aeronautical Products
Certification Branch (GGCP), Rua Dr. Orlando Feirabend Filho, 230--
Centro Empresarial Aquarius--Torre B--Andares 14 a 18, Parque
Residencial Aquarius, CEP 12.246-190--Sao Jose dos
Campos--SP, BRAZIL, Tel: 55 (12) 3203-6600; Email: firstname.lastname@example.org;
internet www.anac.gov.br/en/. You may find this IBR material on the
ANAC website at https://sistemas.anac.gov.br/certificacao/DA/DAE.asp.
You may find this IBR material on the ANAC website at https://sistemas.anac.gov.br/certificacao/DA/DAE.asp.
You may also 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-
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-
0253; or in person at Docket Operations between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal holidays. The AD docket contains
this AD, any comments received, and other information. The street
address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT: Ho-Joon Lim, Aerospace Engineer,
Aircraft Section, International Validation Branch, FAA, 2200 South
216th St., Des Moines, WA 98198; telephone and fax 206-231-3405; email
The ANAC, which is the aviation authority for Brazil, has issued
ANAC AD 2021-02-02, effective February 26, 2021; corrected February 26,
2021 (ANAC AD 2021-02-02) (also referred to as the Mandatory Continuing
Airworthiness Information, or the MCAI); to correct an unsafe condition
for all Yabora Industria Aeronautica S.A. Model
EMB-135 and EMB-145 airplanes. Model EMB-145EU, -145LU, and -145MK
airplanes (which are included in the MCAI applicability) 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 AD was prompted by a report involving disconnection of a side
arm strut from the right MLG; a subsequent investigation found that the
side arm strut lower bearing was installed inverted on the airplane.
Further inspections found more instances of inverted installations on
other airplanes as well as other improper installations (e.g., damaged
or missing sealant, or grease fittings incorrectly installed). The FAA
is issuing this AD to address disconnection of the MLG side arm strut,
which could prevent the MLG from being locked in the down position and
possibly lead to loss of control of the airplane during take-off and
landing. See the MCAI for additional background information.
Related Service Information Under 1 CFR Part 51
ANAC AD 2021-02-02 specifies procedures for doing a general visual
inspection of the right and left MLG to verify the following: That the
grease fittings are installed on the same side of the MLG lower side
arm and the fittings are facing the flight direction, that the flanges
of the MLG side arm bearings are facing the flight direction, and that
there is no migration of the MLG side arm bearings. ANAC AD 2021-02-02
also specifies procedures for applicable on-condition actions,
including replacing the MLG lower side arm and the MLG side arm
bearings with serviceable parts, and reinstalling the MLG lower side
arm and the MLG bearing in the correct position. 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.
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 issuing this AD because the FAA evaluated
all pertinent information and determined the unsafe condition exists
and is likely to exist or develop on other products of the same type
Requirements of This AD
This AD requires accomplishing the actions specified in ANAC AD
2021-02-02 described previously, as incorporated by reference, except
for any differences identified as exceptions in the regulatory text of
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 the European Union
Aviation Safety Agency (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, ANAC AD 2021-02-02 is incorporated by
reference in this final rule. This AD, therefore, requires compliance
with ANAC AD 2021-02-02 in its entirety, through that incorporation,
except for any differences identified as exceptions in the regulatory
text of this AD. Service information specified in ANAC AD 2021-02-02
that is required for compliance with ANAC AD 2021-02-02 is available on
the internet at https://www.regulations.gov by searching for and
locating Docket No. FAA-2021-0253.
FAA's Justification and Determination of the Effective Date
Section 553(b)(3)(B) of the Administrative Procedure Act (APA) (5
U.S.C. 551 et seq.) authorizes agencies to dispense with notice and
comment procedures for rules when the agency, for ``good cause,'' finds
that those procedures are ``impracticable, unnecessary, or contrary to
the public interest.'' Under this section, an agency, upon finding good
cause, may issue a final rule without providing notice and seeking
comment prior to issuance. Further, section 553(d) of the APA
authorizes agencies to make rules effective in less than thirty days,
upon a finding of good cause.
An unsafe condition exists that requires the immediate adoption of
this AD without providing an opportunity for public comments prior to
adoption. The FAA has found that the risk to the flying public
justifies forgoing notice and comment prior to adoption of this rule
because disconnection of the MLG side arm strut could prevent the MLG
from being locked in the down position and possibly lead to loss of
control of the airplane during take-off and landing. Accordingly,
notice and opportunity for prior public comment are impracticable and
contrary to the public interest pursuant to 5 U.S.C. 553(b)(3)(B).
In addition, the FAA finds that good cause exists pursuant to 5
U.S.C. 553(d) for making this amendment effective in less than 30 days,
for the same reasons the FAA found good cause to forgo notice and
The FAA invites you to send any written relevant data, views, or
arguments about this AD. Send your comments to an address listed under
ADDRESSES. Include ``Docket No. FAA-2021-0253; Project Identifier MCAI-
2021-00220-T'' at the beginning of your comments. The most helpful
comments reference a specific portion of the final rule, explain the
reason for any recommended change, and include supporting data. The FAA
will consider all comments received by the closing date and may amend
this final rule 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 final rule.
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 AD 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 AD, 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 AD. Submissions containing CBI should be sent to Ho-Joon
Lim, Aerospace Engineer, Large Aircraft Section, International
Validation Branch, FAA, 2200 South 216th St., Des Moines, WA 98198;
telephone and fax 206-231-3405; email email@example.com. Any
commentary that the FAA receives which is not specifically designated
as CBI will be placed in the public docket for this rulemaking.
Regulatory Flexibility Act (RFA)
The requirements of the RFA do not apply when an agency finds good
cause pursuant to 5 U.S.C. 553 to adopt a rule without prior notice and
comment. Because the FAA has determined that it has good cause to adopt
this rule without notice and comment, RFA analysis is not required.
Costs of Compliance
The FAA estimates that this AD affects 304 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
Estimated Costs for Required Actions
|1 work-hour x $85 per hour =
The FAA estimates that it would take
about 1 work-hour per product
to comply with the on-condition reporting requirement in this 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 $25,840, 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
x $85 per hour = $510
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 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 currently 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, completing and reviewing the collection of
information. All responses to this collection of information are
mandatory. 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
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.
The FAA determined that 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, and
(2) Will not affect intrastate aviation in Alaska.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
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.
Sec. 39.13 [Amended]
2. The FAA amends Sec. 39.13 by adding the following new airworthiness