51838 Federal Register / Vol. 86, No. 178 / Friday, September 17, 2021 / Proposed Rules 

Section, International Validation Branch, 901 

Locust, Room 301, Kansas City, MO 64106; 

phone: (816) 329–4059; fax: (816) 329–4090; 

email: doug.rudolph@faa.gov. 

(2) Refer to European Union Aviation 

Safety Agency (EASA) AD 2021–0098, dated 

April 9, 2021, for more information. You may 

examine the EASA AD in the AD docket at 

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

and locating it in Docket No. FAA–2021– 

0786. 

(3) For service information identified in 

this AD, contact Pilatus Aircraft Ltd., 

Customer Support General Aviation, CH– 

6371 Stans, Switzerland; phone: +41 848 24 

7 365; email: techsupport.ch@pilatusaircraft.com; website: https://www.pilatusaircraft.com. 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 9, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–19961 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–2021–0792; Project 

Identifier AD–2020–00593–G] 

RIN 2120–AA64 

Airworthiness Directives; DG 

Flugzeugbau GmbH Gliders 

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 

DG Flugzeugbau GmbH Models DG– 

500MB and DG–1000M gliders with a 

Solo Kleinmotoren GmbH Solo Model 

2625 02i engine installed. This 

proposed AD was prompted by 

mandatory continuing airworthiness 

information (MCAI) issued by the 

aviation authority of another country to 

identify and correct an unsafe condition 

on an aviation product. The MCAI 

describes the unsafe condition as an 

error in the engine control unit (ECU) 

software. This proposed AD would 

require updating the ECU software. 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 Solo Kleinmotoren 

GmbH, Postfach 600152, D71050 

Sindelfingen, Germany; phone: +49 703 

1301–0; fax: +49 703 1301–136; email: 

aircraft@solo-germany.com; website: 

https://aircraft.solo.global/gb/. 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–2021–0792; 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, FAA, 

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–2021–0792; Project Identifier AD– 

2020–00593–G’’ 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 

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, FAA, 

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 

2020–0056, dated March 13, 2020 

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

address an unsafe condition on Solo 

Kleinmotoren GmbH Solo Model 2625 

02 engines, variation 02i with electronic 

fuel injection, installed on but not 

limited to Binder Motorenbau, DGFlugzeugbau and Schempp-Hirth 

powered sailplanes (gliders). The MCAI 

states: 

An error was found in the ECU affected SW 

[software] that can cause brief injection of 

fuel into one cylinder when the ECU is 

activated. 

This condition, if not corrected, could 

increase the time needed to (re)start the 

engine in flight, possibly resulting in reduced 

control of the powered sailplane. 

To address this potential unsafe condition, 

SOLO Kleinmotoren GmbH, together with the 

ECU manufactuerer [sic], developed an ECU 

SW update and issued the SB [service 

Federal Register / Vol. 86, No. 178 / Friday, September 17, 2021 / Proposed Rules 51839 

bulletin] accordingly, providing installation 

instructions. 

For the reason described above, this 

[EASA] AD requires an update of the ECU 

software. 

You may examine the MCAI in the 

AD docket at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

0792. 

The Model 2625 02i engine does not 

have an FAA type certificate. For Model 

DG–1000M gliders, this engine is part of 

the glider type certification. For Model 

DG–500MB gliders, this engine may be 

installed as a Model 2525 02 engine 

modified with a fuel injection system 

and re-identified as a Model 2625 02i 

engine. 

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 that the 

unsafe condition described previously is 

likely to exist or develop on other 

products of the same type design. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Solo Kleinmotoren 

GmbH Service Bulletin No. 4600–11, 

dated August 19, 2019. This service 

information specifies procedures for 

updating the ECU software to a version 

that fixes a software error found in 

previous ECU software versions. 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. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

updating the ECU software version and 

would prohibit installing software 

version V517 Revision 7 or earlier. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 4 

gliders of U.S. registry. The FAA 

estimates that it would take about 2 

work-hours per glider to comply with 

the requirements of this AD. The 

average labor rate is $85 per work-hour. 

Based on these figures, the FAA 

estimates the cost of this AD on U.S. 

operators to be $680 or $170 per glider. 

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: 

DG Flugzeugbau GmbH: Docket No. FAA– 

2021–0792; Project Identifier AD–2020– 

00593–G. 

(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 DG Flugzeugbau GmbH 

Models DG–500MB and DG–1000M gliders, 

all serial numbers, certificated in any 

category, with a Solo Kleinmotoren GmbH 

Solo Model 2625 02i engine installed. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7300, Engine Fuel and Control. 

(e) Unsafe Condition 

This AD was prompted by mandatory 

continuing airworthiness information (MCAI) 

issued by the aviation authority of another 

country to identify and correct an unsafe 

condition on an aviation product. The MCAI 

describes the unsafe condition as an error in 

the engine control unit (ECU) software. The 

FAA is issuing this AD to prevent an 

injection of fuel into one cylinder when the 

ECU is activated. The unsafe condition, if not 

addressed, could result in difficulty starting 

the engine and reduced control of the glider. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) Within 3 months after the effective date 

of this AD, update the ECU software to 

software version V517 Revision 8 in 

accordance with the Actions in Solo 

Kleinmotoren GmbH Service Bulletin No. 

4600–11, dated August 19, 2019. 

(2) As of the effective date of this AD, do 

not install ECU software version V517 

Revision 7 or earlier on any glider with a 

Solo Kleinmotoren GmbH Solo Model 2625 

02i engine. 

(h) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, 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 paragraph (i)(1) of this AD, 

Related Information, or email: 9-AVS-AIR730-AMOC@faa.gov. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

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.