48070 Federal Register / Vol. 86, No. 164 / Friday, August 27, 2021 / Proposed Rules 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0715; Project 

Identifier AD–2021–00259–A] 

RIN 2120–AA64 

Airworthiness Directives; Various 

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 

various airplanes modified with certain 

configurations of Garmin G3X Touch 

Electronic Flight Instrument System 

installed per Supplemental Type 

Certificate (STC) No. SA01899WI or 

Garmin GI 275 Multi-Function Display 

System (MFDS) installed per STC No. 

SA02658SE. This proposed AD was 

prompted by a report of a fuel quantity 

disparity between the amount of fuel 

indicated and the actual amount of fuel. 

This proposed AD would require 

modifying the resistive fuel probe 

interface. 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 12, 

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 Garmin 

International, Garmin Aviation Support, 

1200 E 151st Street, Olathe, KS 66062; 

phone: (866) 739–5687; email: 

avionics@garmin.com; website: https://

fly.garmin.com/fly-garmin/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–2021–0715; 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: 

Kevin Marks, Aviation Safety Engineer, 

Wichita ACO Branch, FAA, 1801 

Airport Road, Wichita, KS 67209; 

phone: (316) 946–4153; fax: (316) 946– 

4107; email: kevin.marks@faa.gov or 

Wichita-COS@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–2021–0715; Project Identifier AD– 

2021–00259–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 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 Kevin Marks, Aviation 

Safety Engineer, Wichita ACO Branch, 

FAA, 1801 Airport Road, Wichita, KS 

67209. 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 was notified of a Piper 

production line issue with the 

installation of a Garmin G3X Touch 

Electronic Flight Instrument System 

installed under STC No. SA01899WI. 

After calibration and fueling the 

airplane to a known level, the flight 

crew noted that the fuel quantity 

indicator displayed a higher level of 

fuel. 

The Garmin G3X Touch Electronic 

Flight Instrument System, when 

interfaced with the Garmin GEA 24 

(Engine Airframe Adapter) for display of 

the fuel quantity, uses a 1K ohm resistor 

inline between the GEA 24 and the 

airplane fuel quantity resistance style 

sending unit (float). This resistor 

provides lightning protection to the fuel 

tank as required by 14 CFR 23.954. 

Use of the 1K resistor causes a GEA 

error with changing resistor 

temperature. The farther the actual 

(ambient) temperature of the resistor is 

from the temperature of the fuel 

quantity calibration, the larger the error. 

The lower the operating resistance of 

the fuel sending unit, the larger the 

error. The largest errors occur in 

installations with fuel sending units 

having an operational range less than 

100 ohms. The Garmin GI 275 MFDS 

installed under STC No. SA02658SE, 

when interfaced with the Garmin GEA 

24 for display of the fuel quantity, is 

also subject to this unsafe condition. 

The displayed fuel quantity can have 

an error as much as four gallons/fuel 

tank with the display indicating four 

gallons with an empty tank. This 

condition, if not addressed, could result 

in fuel starvation and engine shutdown 

with consequent loss of airplane 

control. 

FAA’s Determination 

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 Garmin 

Mandatory STC Service Bulletin No. 

2134, Revision A, and Garmin 


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Federal Register / Vol. 86, No. 164 / Friday, August 27, 2021 / Proposed Rules 48071 

Mandatory STC Service Bulletin No. 

2135, Revision A, both dated April 23, 

2021. This service information specifies 

procedures for modifying the GEA 24 

resistive fuel probe interface. These 

documents are distinct since they apply 

to different STCs. 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 

The FAA also reviewed Master 

Drawing List (MDL) Document No. 005– 

01320–00, Revision 10, for STC No. 

SA01899WI, and MDL Drawing No. 

005–01208–41, Revision 10, for STC No. 

SA02658SE, both dated April 23, 2021. 

This service information contains the 

type design data for installation of the 

STC. Revision 10 introduces a new fuel 

quantity interface and configuration to 

eliminate the unsafe condition 

described previously. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

modifying the resistive fuel probe 

interface. The proposed AD would 

apply to airplanes on the approved 

model list for STC No. SA01899WI, 

installed in accordance with MDL 

Document No. 005–01320–00, Revision 

9 or earlier, and STC No. SA02658SE, 

installed in accordance with MDL 

Drawing No. 005–01208–41, Revision 9 

or earlier, if the installation is interfaced 

with a Garmin Engine Adapter GEA 24 

connected to resistive fuel probes. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 920 

airplanes of U.S. registry. 

The FAA estimates the following 

costs to comply with this proposed AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Modify fuel probe interface and recalibrate 

the fuel system.

8 work-hours × $85 per hour = $680 ............. $10 $690 $634,800 

The FAA has included all known 

costs in its 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 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: 

Various Airplanes: Docket No. FAA–2021– 

0715; Project Identifier AD–2021–00259– 

A. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by October 12, 

2021. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to all serial numbers of the 

airplane models listed in table 1 to paragraph 

(c), certificated in any category, that are 

either: 

(1) Modified with a Garmin G3X Touch 

Electronic Flight Instrument System under 

Supplemental Type Certificate (STC) No. 

SA01899WI, installed in accordance with 

Master Drawing List (MDL) Document No. 

005–01320–00, Revision 9 or earlier, 

interfaced with a Garmin Engine Adapter 

GEA 24 connected to resistive fuel probes; or 

(2) Modified with a Garmin GI 275 MultiFunction Display System under STC No. 

SA02658SE, installed in accordance with 

MDL Revision 9 or earlier, interfaced with a 

Garmin Engine Adapter GEA 24 connected to 

resistive fuel probes. 

Note 1 to paragraph (c): Garmin 

Mandatory STC Service Bulletin No. 2134, 

Revision A, and Garmin Mandatory STC 

Service Bulletin No. 2135, Revision A, both 

dated April 23, 2021, contain information for 

how to determine if your airplane has a 

resistive probe interface. 

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Table 1 to Paragraph ( c ')-Affected Airplanes 

Type Certificate Holder 

Aermacchi S.p.A. 

Aeronautica Macchi S.p.A./ Aerfer-Industrie 

Aerospaziali Meridionali S.p.A. 

Aerostar Aircraft Corporation 

Air Tractor, Inc. 

Alexandria Aircraft, LLC 

Alpha Aviation Concept Limited 

American Champion Aircraft Corp. 

Aviat Aircraft Inc. 

Bellanca Aircraft Corporation 

B-N Group Ltd. 

Airplane Model 

F.260, F.260B, F.260C, F.260D, F.260E, 

F.260F, S.205-18/F, S.205-18/R, S.205-

20/F, S.205-20/R, S.205-22/R, S.208, and 

S.208A 

AM-3 

PA-60-600 (Aerostar 600), PA-60-601 

(Aerostar 601), PA-60-601P (Aerostar 

601P), and PA-60-602P (Aerostar 602P) 

AT-401 

14-19, 14-19-2, 14-19-3, 14-19-3A, 17-30, 

17-30A, 17-31, 17-3 lA, 17-3 lATC, and 

17-31 TC 

R2160 

402, 7EC, 7ECA, 7FC, 7GC, 7GCA, 

7GCAA, 7GCB, 7GCBA, 7GCBC, 

7KCAB, 8GCBC, and 8KCAB 

A-1, A-IA, A-lB, A-lC-180, A-lC-200, SIS, S-lT, S-2, S-2A, S-2B, S-2C, and S-2S 

14-13, 14-13-2, 14-13-3, and 14-13-3W 

BN-2 and BN-2A 
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The Boeing Company 

CEAPR (type certificate previously held by 

APEX Aircraft) 

Cessna Aircraft Company 

Cirrus Design Corporation 

Commander Aircraft Corporation 

Costruzioni Aeronautiche Tecnam S.P.A. 

Cougar Aircraft Corporation 

Cub Crafters, Inc. 

Daher Aircraft Design, LLC (type certificate 

previously held by Quest Aircraft Design, 

LLC) 

De Havilland Support Limited 

Diamond Aircraft Industries Inc. 

Discovery Aviation, Inc. 

Dynac Aerospace Corporation 

EADS-PZL Warszawa-Ok~cie S.A. 

Extra Flugzeugproduktions- und VertriebsGmbH 

FLS Aerospace (Lovaux) Ltd. 

Found Brothers A via ti on Limited 

Frakes Aviation 

FS 2003 Corporation 

Fuji Heavy Industries, Ltd. 

GA8 Airvan (Pty) Ltd. 

AT-6 (Navy SNJ-2), AT-6A (Navy SNJ-3), 

AT-6B, AT-6C (Navy SNJ-4), AT-6D 

(Navy SNJ-5), AT-6F (Navy SNJ-6), BClA, Navy SNJ-7, and T-6G 

R3000/160 

T-50 (Army AT-17 and UC-78 series, Navy 

JRC-1) 

SR20, SR22, and SR22T 

112, 112B, 112TC, 112TCA, 114, 114A, 

114B, and 114TC 

P2006T 

GA-7 

CC19-180 

Kodiak 100 

B.121 Series 1, B.121 Series 2, and B.121 

Series 3 

DA20-Al, DA20-Cl, DA 40, DA 40 F, and 

DA40NG 

XL-2 

Aero Commander Model 100, Aero 

Commander Model 100-180, Aero 

Commander Model l00A, Volaire Model 

10, and Volaire Model l0A 

PZL-104 Wilga 80, PZL-104M Wilga 

2000, PZL-104MA Wilga 2000, PZLKOLIBER 150A, and PZL-KOLIBER 

160A 

EA-300, EA-300/200, EA-300/L, EA 

300/LC, and EA-300/S 

OA7 Optica Series 300 

FBA Centennial 100 

G-44 (Army OA-14, Navy J4F-2) 

(including SCAN Type 30) and G-44A 

PA-12 and PA-12S 

FA-200-160, FA-200-180, and FA-200-

180AO 

GA8 and GA8-TC 320 
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Gomolzig Flugzeug- und Maschinenbau 

GmbH 

GROB Aircraft SE 

Helio Aircraft Corporation 

Helio Alaska, Inc. 

Howard Aircraft Foundation 

Interceptor Aircraft Inc. 

The King's Engineering Fellowship 

Legend Aviation & Marine, LLC 

Luscombe Aircraft Corporation 

Maule Aerospace Technology, Inc. 

Micco Aircraft Company, Inc. 

Mooney Aircraft Corporation 

Mooney International Corporation 

Nardi S.A. 

Pacific Aerospace Ltd. 

Piaggio & C. 

Pilatus Aircraft Limited 

AS 202/15 BRA VO, AS 202/18A BRA VO, 

and AS 202/18A4 BRA VO 

G 115, G 115A, G 115B, G 115C, G 

115C2, G 115D, and G 115D2 

15A and 20 

H-250, H-295 (USAF UIOD), H-391 

(USAF YL-24), H-391B, H-395 (USAF L28A or U-1 OB), H-395A, H-700, H-800, 

andHT-295 

DGA-15J (Army UC-70B), DGA-15P 

(Army UC-70, Navy GH-1, GH-2, GH-3, 

NH-1), and DGA-15W 

200, 200A, 200B, 200C, 200D, and 400 

44 Angel, 4500-300, and 4500-300 Series II 

UC-1 

8, 8A, 8B, 8C, 8D, 8E, 8F, and T-8F 

Bee Dee M-4, M-4, M-4-180C, M-4-180S, 

M-4-180T, M-4-180V, M-4-210, M-4-

210C, M-4-210S, M-4-210T, M-4-220, M4-220C, M-4-220S, M-4-220T, M-4C, M4S, M-4T, M-5-180C, M-5-200, M-5-210C, 

M-5-210TC, M-5-220C, M-5-235C, M-6-

180, M-6-235, M-7-235, M-7-235A, M-7-

235B, M-7-235C, M-7-260, M-7-260C, M7-420A, M-7-420AC, M-8-235, M-9-235, 

MT-7-235, MT-7-260, MT-7-420, MX-7-

160, MX-7-160C, MX-7-180, MX-7-180A, 

MX-7-180AC, MX-7-180B, MX-7-180C, 

MX-7-235, MX-7-420, MXT-7-160, MXT7-180, and MXT-7-180A 

MAC-125C, MAC-145, MAC-145A, and 

MAC-145B 

M22 

M20, M20A, M20B, M20C, M20D, M20E, 

M20F, M20G, M20J, M20K, M20L, 

M20M, M20R, M20S, and M20TN 

FN-333 

FBA-2C, FBA-2Cl, FBA-2C2, and FBA2C3 

P.136-L and P.136-Ll 

PC-6, PC-6/350, PC-6/350-Hl, PC-6/350-

H2, PC-6-Hl, and PC-6-H2 
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Piper Aircraft, Inc. 

Polskie Zaklady Lotnicze Spolka zo.o 

Revo, Incorporated 

Robert E. Rust, Jr. 

RUAG Aerospace Services GmbH 

Sierra Hotel Aero, Inc. 

Sky Enterprises, Inc. 

Slingsby Aviation Ltd. 

SOCATA (type certificate currently held by 

Daher) 

PA-16, PA-16S, PA-18, PA-18-105 

(Special), PA-18-125 (Army L-21A), PA18-135, PA-18-150, PA-18A, PA-18A-135, 

PA-18A-150, PA-18AS-125, PA-18AS135, PA-18AS-150, PA-18S, PA-18S-105 

(Special), PA-18S-125, PA-18S-135, PA18S-150, PA-19 (Army L-18C), PA-19S, 

PA-20, PA-20-115, PA-20-135, PA-20S, 

PA-20S-115, PA-20S-135, PA-22, PA-22-

108, PA-22-135, PA-22-150, PA-22-160, 

PA-22S-135, PA-22S-150, PA-22S-160, 

PA-23, PA-23-160, PA-23-235, PA-23-250, 

PA-23-250 (Navy UO-1), PA-24, PA-24-

250, PA-24-260, PA-24-400, PA-28-140, 

PA-28-150, PA-28-151, PA-28-160, PA28-161, PA-28-180, PA-28-181, PA-28-

201 T, PA-28-235, PA-28-236, PA-28R180, PA-28R-200, PA-28R-201, PA-28R201T, PA-28RT-201, PA-28RT-201T, PA28S-160, P A-28S-180, P A-30, P A-31-300, 

PA-32-260, PA-32-300, PA-32-301, PA32-301FT, PA-32-301T, PA-32-301XTC, 

PA-32R-300, PA-32R-301 (HP), PA-32R301 (SP), PA-32R-301T, PA-32RT-300, 

PA-32RT-300T, PA-32S-300, PA-34-200, 

PA-34-200T, PA-34-220T, PA-38-112, PA39, PA-40, PA-44-180, PA-44-180T, PA46-310P, PA-46-350P, PA-46R-350T, and 

PA-E23-250 

PZLM26 01 

Colonial Model C-1, Colonial Model C-2, 

Lake Model 250, Lake Model LA-4, and 

Lake Model LA-4-200 

DHC-1 Chipmunk Mk 21, DHC-1 

Chipmunk Mk 22, and DHC-1 Chipmunk 

Mk22A 

Do 27 Q-6, Do 28 A-1, and Do 28 B-1 

Navion (Army L-17 A), Navion A (Army L17B and L-l 7C), Navion B, Navion D, 

Navion E, Navion F, Navion G, and Navion 

H 

RC-3 

T67M260 

MS 880B, MS 885, MS 892A-150, MS 

892E-150, MS 893A, MS 893E, MS 894A, 

MS 894E, Rallye l00S, Rallye 150 ST, 
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Spartan Aircraft Company 

Swift Museum Foundation, Inc. 

Symphony Aircraft Industries Inc. 

Textron Aviation Inc. 

Rallye 150 T, Rallye 235C, Rallye 235 E, 

TB9, TB 10, TB 20, TB 21, and TB 200 

7W (Army UC-71) 

GC-IA and GC-IB 

OMF-100-160 and SA 160 

19A, 23, 35, 36, 50, 58, 76, 77, 95, 120, 

140, 140A, 150, 150A, 150B, 150C, 150D, 

150E, 150F, 150G, 150H, 150J, 150K, 

150L, ISOM, 152, 170, 170A, 170B, 172, 

172A, 172B, l 72C, 172D, l 72E, l 72F 

(USAF T-41A), 172G, 172H (USAF T41A), 1721, 172K, l 72L, 172M, 172N, 

172P, l 72Q, l 72R, l 72RG, 172S, 175, 

175A, 175B, 175C, 177, 177 A, 177B, 

l 77RG, 180, 180A, 180B, 180C, 180D, 

180E, 180F, 180G, 180H, 180J, 180K, 182, 

182A, 182B, 182C, 182D, 182E, 182F, 

182G, 182H, 182J, 182K, 182L, 182M, 

182N, 182P, 182Q, 182R, 182S, 182T, 185, 

185A, 185B, 185C, 185D, 185E, 190, 195, 

195A, 195B, 206, 206H, 207, 207A, 210, 

210-5 (205), 210-SA (205A), 210A, 210B, 

210C,210D,210E,210F,210G,210H, 

210J, 210K, 210L, 210M, 210N, 210R, 

310,310A,310B,310C,310D,310E,310F, 

310G, 310H, 3101, 310J, 310J-l, 310K, 

310L, 310N, 310P, 310Q, 310R, 320, 320-

1, 320A, 320B, 320C, 320D, 320E, 320F, 

335,336,337,337A,337B,337C,337D, 

337E, 337F, 337G, 337H, 340, 340A, 35-

33, 35-A33, 35-B33, 35-C33, 35-C33A, 

35R, 45 (Military YT-34), 56TC, 58A, 

58PA, 58TCA, 95-55, 95-A55, 95-B55, 95-

B55A, 95-B55B, 95-C55, 95-C55A, 

A150K, A150L, A150M, A152, A185E, 

Al85F, A23, A23-19, A23-24, A23A, A24, 

A24R, A35, A36, A36TC, A45 (Military T34A, B-45), A56TC, B19, B23, B24R, B35, 

B36TC, B50, B95, B95A, C23, C24R, C35, 

C50, Dl7S, D35, D45 (Military T-34B), 

DS0E-5990, D55, D55A, D95A, E310H, 

E310J, E33, E33A, E33C, E35, E55, ESSA, 

E95, F150F, F150G, F150H, F150J, 

Fl50K, Fl50L, Fl50M, Fl 52, Fl 72D, 

Fl 72E, Fl 72F, Fl 72G, Fl 72H, Fl 72K, 

Fl 72L, Fl 72M, Fl 72N, Fl 72P, Fl 77RG, 

F182P,F182Q,F33,F33A,F33C,F337E, 

F337F, F337G, F337H, F35, FA150K, 

FA150L, FA150M, FA152, FP172D, 
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Thrush Aircraft, LLC 

Topcub Aircraft, Inc. 

True Flight Holdings LLC 

Twin Commander Aircraft LLC 

Univair Aircraft Corporation 

Viking Air Limited 

Vulcanair S.p.A. 

Waco Aircraft Company 

WACO Classic Aircraft Corporation 

WSK PZL Mielec and OBR SK Mielec 

W.Z.D. Enterprises Inc 

ZenairLtd. 

Zlin Aircraft a.s. 

FR172E, FR172F, FR172G, FR172H, 

FRI 72J, FRI 72K, FR182, FRA150L, 

FRA150M, FT337E, FT337F, FT337GP, 

FT337HP, G17S, G33, G35, G36, G58, 

H35, J35, K35, LC40-550FG, LC41-

550FG, LC42-550FG, M19A, M337B, 

M35, N35, P172D, P206, P206A, P206B, 

P206C, P206D, P206E, P21 ON, P21 OR, 

P337H, P35, R172E, R172F, R172G, 

R172H, R172J, R172K, R182, S35, SD17S, 

T182, T182T, T206H, T207, T207A, 

T210F, T210G, T210H, T210J, T210K, 

T21 0L, T21 OM, T21 ON, T21 OR, T240, 

T303, T310P, T310Q, T310R, T337B, 

T337C, T337D, T337E, T337F, T337G, 

T337H, T337H-SP, TP206A, TP206B, 

TP206C, TP206D, TP206E, TR182, 

TU206A, TU206B, TU206C, TU206D, 

TU206E, TU206F, TU206G, U206, 

U206A, U206B, U206C, U206D, U206E, 

U206F, U206G, V35, V35A, and V35B 

600 S-2D, S2R, S2R-R1340, S2R-R1820, 

S2R-R3S, and S2R-T34 

CC18-180 and CC18-180A 

AA-1, AA-IA, AA-1B, AA-IC, AA-5, 

AA-SA, AA-5B, and AG-5B 

500, 500-A, 520, 560, and 560-A 

108, 108-1, 108-2, 108-3, 108-5, 415-C, 

415-CD, 415-D, A-2, A2-A, E, F-1, F-lA, 

G, and MIO 

DHC-2 Mk.I, DHC-2 Mk.II, DHC-2 

Mk.III, and TR-1 

P.68, P.68 "Observer," P.68B, P.68C, 

P.68C-TC, P.68R, P.68 Observer 2, P.68TC 

Observer, and Vulcanair Vl.0 

YMF 

2T-1A, 2T-1A-1, and 2T-1A-2 

PZLM20 03 

llA and llE 

CH2000 

Z-143L, Z-242L, and Zlin 526L 
48078 Federal Register / Vol. 86, No. 164 / Friday, August 27, 2021 / Proposed Rules 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 2841, Fuel Quantity Indicator. 

(e) Unsafe Condition 

This AD was prompted by reports of fuel 

quantity disparities between the amount of 

fuel indicated and the actual amount of fuel. 

The FAA is issuing this AD to ensure that the 

amount of fuel indicated is the amount of 

fuel available. The unsafe condition, if not 

addressed, could result in fuel starvation and 

engine shutdown with consequent loss of 

airplane control. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Action 

Within 100 hours time-in-service after the 

effective date of this AD or within 12 months 

after the effective date of this AD, whichever 

occurs first, modify the fuel probe interface 

by following the Modification Instructions in 

Garmin Mandatory STC Service Bulletin No. 

2134, Revision A, or Garmin Mandatory STC 

Service Bulletin No. 2135, Revision A, both 

dated April 23, 2021, whichever is 

applicable. 

(h) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, Wichita ACO Branch, 

FAA, has the authority to approve AMOCs 

for this AD, if requested using the procedures 

found in 14 CFR 39.19. In accordance with 

14 CFR 39.19, send your request to your 

principal inspector or local Flight Standards 

District Office, as appropriate. If sending 

information directly to the manager of the 

certification office, send it to the attention of 

the person identified in Related Information. 

(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 Kevin Marks, Aviation Safety 

Engineer, Wichita ACO Branch, FAA, 1801 

Airport Road, Wichita, KS 67209; phone: 

(316) 946–4153; fax: (316) 946–4107; email: 

kevin.marks@faa.gov or Wichita-COS@

faa.gov. 

(2) For service information identified in 

this AD, contact Garmin International, 

Garmin Aviation Support, 1200 E 151st 

Street, Olathe, KS 66062; phone: (866) 739– 

5687; email: avionics@garmin.com; website: 

https://fly.garmin.com/fly-garmin/support/. 

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 August 20, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–18385 Filed 8–26–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0713; Project 

Identifier AD–2021–00180–R] 

RIN 2120–AA64 

Airworthiness Directives; Bell Textron 

Inc., Helicopters 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

Bell Textron Inc., Model 412, 412EP, 

and 412CF helicopters. This proposed 

AD was prompted by evaluation results 

showing flight loads that impact the 

collective lever fatigue life. This 

proposed AD would require adding a 

permanent life penalty for certain 

collective levers and prohibit installing 

those collective levers unless the 

permanent life penalty has been added. 

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 12, 

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 Bell Textron, Inc., 

P.O. Box 482, Fort Worth, TX 76101; 

telephone 1–450–437–2862 or 1–800– 

363–8023; fax 1–450–433–0272; email 

productsupport@bellflight.com; or at 

https://www.bellflight.com/support/ 

contact-support. You may view this 

service information at the FAA, Office 

of the Regional Counsel, Southwest 

Region, 10101 Hillwood Pkwy., Room 

6N–321, Fort Worth, TX 76177. For 

information on the availability of this 

material at the FAA, call (817) 222– 

5110. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0713; 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: 

Haytham Alaidy, Aerospace Engineer, 

Certification & Program Management 

Section, DSCO Branch, Compliance & 

Airworthiness Division, FAA, 10101 

Hillwood Pkwy., Fort Worth, TX 76177; 

telephone (817) 222–5224; email 

haytham.alaidy@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–2021–0713; Project Identifier AD– 

2021–00180–R’’ 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 


lotter on DSK11XQN23PROD with PROPOSALS1