51840 Federal Register / Vol. 86, No. 178 / Friday, September 17, 2021 / Proposed Rules 

or lacking a principal inspector, the manager 

of the local flight standards district office/ 

certificate holding district office. 

(i) 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 European Union Aviation 

Safety Agency (EASA) AD 2020–0056, dated 

March 13, 2020, for more information. You 

may examine the EASA AD in the AD docket 

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

for and locating Docket No. FAA–2021–0792. 

(3) For service information identified in 

this AD, contact Solo Kleinmotoren GmbH, 

Postfach 600152, D71050 Sindelfingen, 

Germany; phone: +49 703 1301–0; fax: +49 

703 1301–136; email: aircraft@sologermany.com; website: https://aircraft.solo.

global/gb/. You may view this referenced 

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 September 13, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–20034 Filed 9–16–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0795; Project 

Identifier 2019–CE–054–AD] 

RIN 2120–AA64 

Airworthiness Directives; Daher 

Aerospace (Type Certificate Previously 

Held by SOCATA) Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for all 

Daher Aerospace (type certificate 

previously held by SOCATA) Models 

TB 20 and TB 21 airplanes. This AD was 

prompted by mandatory continuing 

airworthiness information (MCAI) 

originated by an aviation authority of 

another country to identify and correct 

an unsafe condition on an aviation 

product. The MCAI describes the unsafe 

condition as cracks on the main landing 

gear (MLG) legs. This proposed AD 

would require repetitively inspecting 

the MLG and performing all applicable 

corrective actions. 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 November 1, 

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 service information identified in 

this NPRM, contact Daher Aircraft Inc., 

Pompano Beach Airpark, 601 NE 10th 

Street, Pompano Beach, FL 33060; 

phone: (954) 893–1400; website: 

www.tbm.aero. 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–2021–0795; 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: 

Gregory Johnson, Aviation Safety 

Engineer, FAA, General Aviation & 

Rotorcraft Section, International 

Validation Branch, 901 Locust, Room 

301, Kansas City, MO 64106; phone: 

(720) 626–5462; fax: (816) 329–4090; 

email: gregory.johnson@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 the ADDRESSES section. Include 

‘‘Docket No. FAA–2021–0795; Project 

Identifier 2019–CE–054–AD’’ at the 

beginning of your comments. The most 

helpful comments reference a specific 

portion of the proposal, explain the 

reason for any recommended change, 

and include supporting data. The FAA 

will consider all comments received by 

the closing date and may amend 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 Gregory Johnson, 

Aviation Safety Engineer, FAA, 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 European Union Aviation Safety 

Agency (EASA), which is the Technical 

Agent for the Member States of the 

European Union, has issued EASA AD 

2019–0274, dated November 6, 2019 

(referred to after this as ‘‘the MCAI’’), to 

address an unsafe condition on all 

Daher Aerospace (formerly SOCATA) 

Models TB 20 and TB 21 airplanes. The 

MCAI states: 

Occurrences have been reported of finding 

cracks on MLG legs of TB 20 and TB 21 

aeroplanes. 

This condition, if not detected and 

corrected, could lead to structural failure of 

an MLG leg and consequent MLG collapse, 

possibly resulting in damage to the aeroplane 

and injury to occupants. 

Federal Register / Vol. 86, No. 178 / Friday, September 17, 2021 / Proposed Rules 51841 

To address this potential unsafe condition, 

DAHER Aerospace issued the [service 

bulletin] SB to provide inspection 

instructions. 

For the reasons described above, this 

[EASA] AD requires repetitive special 

detailed inspections (SDI) using magnetic 

particle method of the affected MLG area, 

and, depending on findings, accomplishment 

of applicable corrective action(s). 

You may examine the MCAI in the 

AD docket at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

0795. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Daher Service 

Bulletin SB 10–154–32, dated 

September 2019. The service 

information contains procedures for 

repetitively inspecting the MLG area for 

cracks and performing any rework and 

repair. 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. 

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 referenced above. The FAA 

is issuing this NPRM after determining 

the unsafe condition described 

previously 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 

the service information already 

described. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 52 

airplanes of U.S. registry. The FAA also 

estimates that it would take about 8 

work-hours per airplane to perform the 

magnetic particle inspection that would 

be required by this proposed AD. The 

average labor rate is $85 per work-hour. 

Based on these figures, the FAA 

estimates the inspection cost of this 

proposed AD on U.S. operators to be 

$35,360, or $680 per airplane, per 

inspection cycle. 

In addition, the FAA estimates that 

any necessary rework would take 12 

work-hours and require parts costing 

$400, for a cost of $1,420 per airplane. 

The FAA has no way of determining the 

number of airplanes that may need these 

actions. If the reworked MLG area is 

found damaged during a follow-on 

magnetic particle inspection, because 

the damage may vary considerably from 

airplane to airplane, the FAA has no 

way of estimating this repair cost. 

Authority for This Rulemaking 

Title 49 of the United States Code 

specifies the FAA’s authority to issue 

rules on aviation safety. Subtitle I, 

section 106, describes the authority of 

the FAA Administrator. Subtitle VII: 

Aviation Programs, describes in more 

detail the scope of the Agency’s 

authority. 

The FAA is issuing this rulemaking 

under the authority described in 

Subtitle VII, Part A, Subpart III, Section 

44701: General requirements. Under 

that section, Congress charges the FAA 

with promoting safe flight of civil 

aircraft in air commerce by prescribing 

regulations for practices, methods, and 

procedures the Administrator finds 

necessary for safety in air commerce. 

This regulation is within the scope of 

that authority because it addresses an 

unsafe condition that is likely to exist or 

develop on products identified in this 

rulemaking action. 

Regulatory Findings 

The FAA determined that this 

proposed AD would not have federalism 

implications under Executive Order 

13132. This proposed AD would not 

have a substantial direct effect on the 

States, on the relationship between the 

national Government and the States, or 

on the distribution of power and 

responsibilities among the various 

levels of government. 

For the reasons discussed above, I 

certify this proposed regulation: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Would not affect intrastate 

aviation in Alaska, and 

(3) Would not have a significant 

economic impact, positive or negative, 

on a substantial number of small entities 

under the criteria of the Regulatory 

Flexibility Act. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 14 CFR part 

39 as follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

Daher Aeropsace (Type Certificate 

Previously Held by SOCATA): Docket 

No. FAA–2021–0795; Project Identifier 

2019–CE–054–AD. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by November 1, 

2021. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Daher Aerospace (type 

certificate previously held by SOCATA) 

Models TB 20 and TB 21 airplanes, all serial 

numbers, certificated in any category. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 3200, Landing Gear System. 

(e) Unsafe Condition 

This AD was prompted by mandatory 

continuing airworthiness information (MCAI) 

originated by an aviation authority of another 

country to identify and correct an unsafe 

condition on an aviation product. The MCAI 

describes the unsafe condition as cracks on 

the main landing gear (MLG) legs. The FAA 

is issuing this AD to prevent structural 

failure of an MLG leg and consequent 

collapse of the MLG. The unsafe condition, 

if not addressed, could result in damage to 

the airplane and injury to occupants. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Repetitive Inspections 

(1) Before the MLG exceeds 16,000 

landings since first installation on an 

airplane or within 200 landings after the 

effective date of this AD, whichever occurs 

later, and thereafter at intervals not to exceed 

3,200 landings, accomplish the magnetic 

particle inspection on each MLG for cracks 

in the left-hand and right-hand MLG leg and 

take all applicable corrective actions before 

further flight in accordance with the 

Description of Accomplishment Instructions 

in Daher Service Bulletin SB 10–154–32, 

dated September 2019, except you are not 

required to contact the manufacturer. Instead, 

repair using a method approved by the 

Manager, International Validation Branch, 

FAA; the European Union Aviation Safety 

Agency (EASA); or Daher Aerospace’s EASA 

Design Organization Approval (DOA). If 

approved by the DOA, the approval must 

include the DOA-authorized signature. For a 

51842 Federal Register / Vol. 86, No. 178 / Friday, September 17, 2021 / Proposed Rules 

repair to be approved as required by this 

paragraph, the approval letter must 

specifically refer to this AD. 

(2) For the purposes of this AD, any 

maneuver resulting in weight on the MLG for 

any duration of time after initial takeoff 

counts as a landing. If the number of landings 

for the MLG is unknown, multiply the 

number of airframe hours by a factor of 3.6 

and round up to the nearest whole landing. 

(h) 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 certification office, 

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. 

(i) Related Information 

(1) For more information about this AD, 

contact Gregory Johnson, Aviation Safety 

Engineer, FAA, General Aviation & Rotorcraft 

Section, International Validation Branch, 901 

Locust, Room 301, Kansas City, MO 64106; 

phone: (720)-626–5462; fax: (816) 329–4090; 

email: gregory.johnson@faa.gov. 

(2) Refer to European Union Aviation 

Safety Agency (EASA) AD 2019–0274, dated 

November 6, 2019, for more information. You 

may examine the EASA AD in the AD docket 

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

for and locating Docket No. FAA–2021–0795. 

(3) For service information identified in 

this AD, contact Daher Aircraft Inc., 

Pompano Beach Airpark, 601 NE 10th Street, 

Pompano Beach, FL 33060; phone: (954) 

893–1400; website: www.tbm.aero. You may 

view this referenced 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 September 8, 2021. 

Ross Landes, 

Deputy Director for Regulatory Operations, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–19962 Filed 9–16–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0216; Project 

Identifier 2018–CE–061–AD] 

RIN 2120–AA64 

Airworthiness Directives; Gulfstream 

Aerospace Corporation Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for all 

Gulfstream Aerospace Corporation 

(Gulfstream) Models GV and GV–SP 

airplanes. This proposed AD was 

prompted by the omission of a life limit 

in the airworthiness limitations section 

(ALS) of the maintenance manual for a 

certain main landing gear (MLG) 

trunnion pin. This proposed AD would 

require revising the ALS of your existing 

instructions for continued airworthiness 

(ICA) or inspection program for the 

airplane to establish a life limit of 

20,000 flight cycles for the affected MLG 

trunnion pin. 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 November 1, 

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 service information identified in 

this NPRM, contact Gulfstream 

Aerospace Corporation, Technical 

Publications Dept., 500 Gulfstream 

Road, Savannah, GA 31402–2206; 

phone: (800) 810–4853; fax: (912) 965– 

3520; email: pubs@gulfstream.com; 

website: https://www.gulfstream.com/ 

en/customer-support/. 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–2021–0216; 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: 

Miral Patel, Aviation Safety Engineer, 

Atlanta ACO Branch, FAA, 1701 

Columbia Avenue, College Park, GA 

30337; phone: (404) 474–5590; fax: (404) 

474–5606; email: miral.patel@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–2021–0216; Project Identifier 

2018–CE–061–AD’’ at the beginning of 

your comments. The most helpful 

comments reference a specific portion of 

the proposal, explain the reason for any 

recommended change, and include 

supporting data. The FAA will consider 

all comments received by the closing 

date and may amend this proposal 

because of those comments. 

Except for Confidential Business 

Information (CBI) as described in the 

following paragraph, and other 

information as described in 14 CFR 

11.35, the FAA will post all comments 

received, without change, to https://

www.regulations.gov, including any 

personal information you provide. The 

agency will also post a report 

summarizing each substantive verbal 

contact received about this NPRM. 

Confidential Business Information 

CBI is commercial or financial 

information that is both customarily and 

actually treated as private by its owner. 

Under the Freedom of Information Act 

(FOIA) (5 U.S.C. 552), CBI is exempt 

from public disclosure. If your 

comments responsive to this NPRM 

contain commercial or financial 

information that is customarily treated 

as private, that you actually treat as 

private, and that is relevant or 

responsive to this NPRM, it is important 

that you clearly designate the submitted 

comments as CBI. Please mark each 

page of your submission containing CBI 

as ‘‘PROPIN.’’ The FAA will treat such 

marked submissions as confidential 

under the FOIA, and they will not be