This section of the FEDERAL REGISTER

contains notices to the public of the proposed

issuance of rules and regulations. The

purpose of these notices is to give interested

persons an opportunity to participate in the

rule making prior to the adoption of the final

rules.

Proposed Rules Federal Register

30395 

Vol. 86, No. 108 

Tuesday, June 8, 2021 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0453; Project 

Identifier MCAI–2021–00377–R] 

RIN 2120–AA64 

Airworthiness Directives; Airbus 

Helicopters 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to 

supersede Airworthiness Directive (AD) 

2021–04–15, which applies to all Airbus 

Helicopters Model AS355E, AS355F, 

AS355F1, AS355F2, AS355N, and 

AS355NP helicopters; and certain 

Model AS350B3 helicopters. AD 2021– 

04–15 requires repetitive visual 

inspections of the right-hand side of the 

vertical fin spar for discrepancies 

(cracking), and corrective action if 

necessary. Since the FAA issued AD 

2021–04–15, the FAA has determined 

that additional actions are required to 

address the unsafe condition. This 

proposed AD would retain the 

requirements of AD 2021–04–15, and 

would require repetitive cleaning and 

repetitive detailed inspections for 

cracking of the vertical fin spar and 

vertical fin upper attachments, and 

corrective action if necessary, as 

specified in a European Union Aviation 

Safety Agency (EASA) AD, which is 

proposed for incorporation by reference 

(IBR). This proposed AD would also 

expand the applicability to include 

additional Model AS350B3 helicopters. 

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 July 23, 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 material that is proposed for IBR 

in this AD, contact the EASA, KonradAdenauer-Ufer 3, 50668 Cologne, 

Germany; telephone +49 221 8999 000; 

email ADs@easa.europa.eu; internet 

www.easa.europa.eu. You may find this 

IBR material on the EASA website at 

https://ad.easa.europa.eu. You may 

view this material 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. 

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– 

0453. 

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– 

0453; 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. 

Comments will be available in the AD 

docket shortly after receipt. 

FOR FURTHER INFORMATION CONTACT: 

Kathleen Arrigotti, Program Manager, 

Large Aircraft Section, International 

Validation Branch, Compliance & 

Airworthiness Division, FAA, 2200 

South 216th St., Des Moines, WA 98198; 

telephone and fax 206–231–3218; email 

kathleen.arrigotti@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–2021–0453; Project Identifier 

MCAI–2021–00377–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 proposal. 

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 Kathleen Arrigotti, 

Program Manager, Large Aircraft 

Section, International Validation 

Branch, Compliance & Airworthiness 

Division, FAA, 2200 South 216th St., 

Des Moines, WA 98198; telephone and 

fax 206–231–3218; email 

kathleen.arrigotti@faa.gov. Any 

commentary that the FAA receives that 

is not specifically designated as CBI will 

be placed in the public docket for this 

rulemaking. 

Background 

The FAA issued AD 2021–04–15, 

Amendment 39–21437 (86 FR 13165, 

March 8, 2021) (AD 2021–04–15), which 

applies to all Airbus Helicopters Model 

AS355E, AS355F, AS355F1, AS355F2, 


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AS355N, and AS355NP helicopters; and 

certain Model AS350B3 helicopters. AD 

2021–04–15 requires repetitive visual 

inspections of the right-hand side of the 

vertical fin spar for cracking, and 

corrective action if necessary. The FAA 

issued AD 2021–04–15 to address 

cracking in the spar of the upper part of 

the vertical fin and fractures in the front 

attachment screws. This condition 

could lead to in-flight separation of the 

upper part of the vertical fin, resulting 

in loss of control of the helicopter. 

Actions Since AD 2021–04–15 Was 

Issued 

The preamble to AD 2021–04–15 

explains that the FAA was considering 

further rulemaking to address the 

actions specified in paragraph (2) of 

EASA AD 2020–0186, dated August 20, 

2020. The FAA has now determined 

that further rulemaking is indeed 

necessary, and this proposed AD 

follows from that determination. This 

proposed AD would require additional 

actions and would expand the 

applicability to include additional 

Airbus Helicopters Model AS350B3 

helicopters (i.e., Model AS350B3 

helicopters modified through 

Eurocopter AS350 Service Bulletin 

55.00.14 in service). Eurocopter AS350 

Service Bulletin 55.00.14 was optional 

terminating action in EASA AD 2020– 

0186. However, helicopters modified by 

Eurocopter AS350 Service Bulletin 

55.00.14 are affected by fatigue cracking 

and must be inspected. A terminating 

action is not included in this proposed 

AD. 

The EASA, which is the Technical 

Agent for the Member States of the 

European Union, has issued EASA AD 

2021–0099, dated April 9, 2021 (EASA 

AD 2021–0099) (also referred to as the 

Mandatory Continuing Airworthiness 

Information, or the MCAI), to correct an 

unsafe condition for all Airbus 

Helicopters Model AS355E, AS355F, 

AS355F1, AS355F2, AS355N, and 

AS355NP helicopters; and all Model 

AS350B3 helicopters except those that 

have that embodied Airbus Helicopters 

Modification 073148 in production. 

EASA stated that recent analysis 

identified that AS350B3 helicopters 

modified through Eurocopter AS350 

Service Bulletin 55.00.14 (any revision) 

in service might also be affected by the 

identified unsafe condition. 

This proposed AD was prompted by 

a determination that additional actions 

are required to address the unsafe 

condition and additional helicopters are 

affected by the identified unsafe 

condition. This proposed AD was also 

prompted by a report that, during an 

unscheduled post-flight inspection of 

the tail cone area of an Airbus 

Helicopters Model AS355NP helicopter, 

a crack was found in the spar of the 

upper part of the vertical fin and 

fractures were found in the two front 

attachment screws. Airbus Helicopters 

Model AS350B3 helicopters have a 

similar vertical fin configuration and are 

subject to comparable load levels as the 

affected Model AS355NP helicopter, 

therefore, this model may be subject to 

the same unsafe condition revealed on 

the Model AS355NP helicopter. The 

FAA is proposing this AD to address 

cracking in the spar of the upper part of 

the vertical fin and fractures in the front 

attachment screws. This condition 

could lead to in-flight separation of the 

upper part of the vertical fin, resulting 

in loss of control of the helicopter. See 

the MCAI for additional background 

information. 

Related Service Information Under 1 

CFR Part 51 

EASA AD 2021–0099 specifies 

procedures for repetitive visual 

inspections of the right-hand side of the 

vertical fin spar for cracking; repetitive 

cleaning and repetitive detailed 

inspections for cracking of the vertical 

fin spar and vertical fin upper 

attachments; and corrective action. The 

corrective action includes repair. 

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. 

FAA’s Determination and Requirements 

of This Proposed AD 

These products have been approved 

by the aviation authority of another 

country, and are approved for operation 

in the United States. Pursuant to the 

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 proposing this AD 

after evaluating all the relevant 

information and determining the unsafe 

condition described previously is likely 

to exist or develop in other products of 

these same type designs. 

Explanation of Retained Requirements 

Although this proposed AD does not 

explicitly restate the requirements of AD 

2021–04–15, this proposed AD would 

retain all of the requirements of AD 

2021–04–15. Those requirements are 

referenced in EASA AD 2021–0099, 

which, in turn, is referenced in 

paragraph (g) of this proposed AD. 

Proposed AD Requirements 

This proposed AD would require 

accomplishing the actions specified in 

EASA AD 2021–0099 described 

previously, as incorporated by 

reference, except for any differences 

identified as exceptions in the 

regulatory text of this AD. 

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 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, EASA AD 

2021–0099 will be incorporated by 

reference in the FAA final rule. This 

proposed AD would, therefore, require 

compliance with EASA AD 2021–0099 

in its entirety, through that 

incorporation, except for any differences 

identified as exceptions in the 

regulatory text of this proposed AD. 

Using common terms that are the same 

as the heading of a particular section in 

the EASA AD does not mean that 

operators need comply only with that 

section. For example, where the AD 

requirement refers to ‘‘all required 

actions and compliance times,’’ 

compliance with this AD requirement is 

not limited to the section titled 

‘‘Required Action(s) and Compliance 

Time(s)’’ in the EASA AD. Service 

information specified in EASA AD 

2021–0099 that is required for 

compliance with EASA AD 2021–0099 

will be available on the internet at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0453 after the FAA final 

rule is published. 

Costs of Compliance 

The FAA estimates that this proposed 

AD affects 650 helicopters of U.S. 

registry. The FAA estimates the 

following costs to comply with this 

proposed AD: 


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ESTIMATED COSTS FOR REQUIRED ACTIONS

Action Labor cost Parts cost Cost per product Cost on U.S. operators 

Retained actions from AD 

2021–04–15.

7 work-hours × $85 per hour 

= $595, per inspection/ 

cleaning cycle.

$0 $595, per inspection/cleaning 

cycle.

$386,750, per inspection/ 

cleaning cycle. 

New proposed actions ........... 4 work-hours × $85 per hour 

= $340, per inspection/ 

cleaning cycle.

0 $340, per inspection/cleaning 

cycle.

$221,000, per inspection/ 

cleaning cycle. 

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 helicopters that might need 

these on-condition actions: 

ESTIMATED COSTS OF ON-CONDITION ACTIONS

Labor cost Parts cost Cost per 

product 

4 work-hours × $85 per hour = $340 ...................................................................................................................... $17,052 $17,392 

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: 

■ a. Removing Airworthiness Directive 

(AD) 2021–04–15, Amendment 39– 

21437 (86 FR 13165, March 8, 2021); 

and 

■ b. Adding the following new AD: 

Airbus Helicopters: Docket No. FAA–2021– 

0453; Project Identifier MCAI–2021– 

00377–R. 

(a) Comments Due Date 

The FAA must receive comments by July 

23, 2021. 

(b) Affected Airworthiness Directives (ADs) 

This AD replaces AD 2021–04–15, 

Amendment 39–21437 (86 FR 13165, March 

8, 2021) (AD 2021–04–15). 

(c) Applicability 

This AD applies to Airbus Helicopters 

specified in paragraph (c)(1) and (2) of this 

AD, certificated in any category. 

(1) Model AS355E, AS355F, AS355F1, 

AS355F2, AS355N, and AS355NP 

helicopters, all serial numbers. 

(2) Model AS350B3 helicopters, all serial 

numbers except those that have embodied 

Airbus Helicopters Modification 073148 in 

production. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 5531, Vertical Stabilizer, Spar/Rib. 

(e) Unsafe Condition 

This AD was prompted by a report that, 

during an unscheduled post-flight inspection 

of the tail cone area of an Airbus Helicopters 

Model AS355NP helicopter, a crack was 

found in the spar of the upper fin and 

fractures were found in the two front 

attachment screws. The FAA is issuing this 

AD to address cracking in the spar of the 

upper part of the vertical fin and fractures in 

the front attachment screws. This condition 

could lead to in-flight separation of the upper 

part of the vertical fin, resulting in loss of 

control of the helicopter. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Requirements 

Except as specified in paragraph (h) of this 

AD: Comply with all required actions and 

compliance times specified in, and in 

accordance with, European Union Aviation 

Safety Agency (EASA) AD 2021–0099, dated 

April 9, 2021 (EASA AD 2021–0099). 

(h) Exceptions to EASA AD 2021–0099 

(1) Where EASA AD 2021–0099 refers to its 

effective date or to July 12, 2017, (the 

effective date of EASA AD 2017–0114, dated 

June 28, 2017), this AD requires using the 

effective date of this AD. 

(2) The ‘‘Remarks’’ section of EASA AD 

2021–0099 does not apply to this AD. 

(3) Where EASA AD 2021–0099 refers to 

flight hours (FH), this AD requires using 

hours time-in-service. 

(4) Where paragraph (4) of EASA AD 2021– 

0099 specifies to contact the manufacturer for 

approved repair instructions, for this AD, if 


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any cracking is detected during any 

inspection, repair before further flight using 

a method approved by the Manager, 

International Validation Branch, FAA. For a 

repair method to be approved by the 

Manager, International Validation Branch, as 

required by this paragraph, the Manager’s 

approval letter must specifically refer to this 

AD. 

(5) Where the service information referred 

to in EASA AD 2021–0099 specifies to 

perform a visual inspection for cracking on 

the ‘‘RH side of spar (a)’’ and ‘‘if you are not 

sure’’ remove the rear and the tail rotor gear 

box (TGB) fairings to perform a detailed 

inspection and do a dye-penetrant 

inspection, those actions are required by this 

AD if any crack indication (e.g., paint chips, 

dents, or swelling) is found during any 

inspection done without removing the rear 

and the TGB fairings. 

(6) Where the service information referred 

to in EASA AD 2021–0099 specifies to 

perform a visual check for cracks in the 

‘‘spars (a) of the top and bottom fins’’ and ‘‘if 

you are not sure’’ do a dye-penetrant 

inspection, the dye-penetrant inspection is 

required by this AD if any crack indication 

(e.g., paint chips, dents, or swelling) is found 

during any visual check (inspection). 

(7) Where the service information referred 

to in EASA AD 2021–0099 specifies to check 

the integrity of the two thrust pad attachment 

screws for damage, for this AD, damage 

includes loosening, deformation, and nicks. 

(i) Special Flight Permit 

Special flight permits, as described in 14 

CFR 21.197 and 21.199, are prohibited. 

(j) 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 International Validation 

Branch, send it to the attention of the person 

identified in paragraph (k)(2) of this AD. 

Information may be emailed to: 9-AVS-AIR730-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. 

(k) Related Information 

(1) For EASA AD 2021–0099, contact the 

EASA, Konrad-Adenauer-Ufer 3, 50668 

Cologne, Germany; telephone +49 221 8999 

000; email ADs@easa.europa.eu; internet 

www.easa.europa.eu. You may find this 

EASA AD on the EASA website at https://

ad.easa.europa.eu. You may view this 

material 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. This 

material may be found in the AD docket on 

the internet at https://www.regulations.gov 

by searching for and locating Docket No. 

FAA–2021–0453. 

(2) For more information about this AD, 

contact Kathleen Arrigotti, Program Manager, 

Large Aircraft Section, International 

Validation Branch, Compliance & 

Airworthiness Division, FAA, 2200 South 

216th St., Des Moines, WA 98198; telephone 

and fax (206) 231–3218; email 

kathleen.arrigotti@faa.gov. 

Issued on June 2, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–11965 Filed 6–7–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[FAA Docket No. FAA–2020–0994; Project 

Identifier AD–2020–00687–T] 

RIN 2120–AA64 

Airworthiness Directives; Gulfstream 

Aerospace Corporation Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Proposed rule; withdrawal. 

SUMMARY: The FAA is withdrawing a 

notice of proposed rulemaking (NPRM) 

that proposed to adopt a new 

airworthiness directive (AD) for certain 

Gulfstream Aerospace Corporation 

(Gulfstream) Model GVII–G600 

airplanes. The NPRM was prompted by 

a report that a failure mode in the data 

concentration network (DCN) software 

causes the pitch attitude value to freeze 

on the primary flight display (PFD) for 

up to 20 seconds. The NPRM proposed 

to require updating the DCN and flight 

deck master operating system (MOS) 

software. Since issuance of the NPRM, 

the FAA has determined that there is 

not an unsafe condition because all 

affected airplanes have updated 

software. Accordingly, the NPRM is 

withdrawn. 

DATES: As of June 8, 2021, the proposed 

rule, which published in the Federal 

Register on February 23, 2021 (86 FR 

10875), is withdrawn. 

ADDRESSES:

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2020–0994; 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 action, the regulatory evaluation, 

any comments received, and other 

information. The street address for 

Docket Operations is U.S. Department of 

Transportation, Docket Operations, 

M–30, West Building Ground Floor, 

Room W12–140, 1200 New Jersey 

Avenue SE, Washington, DC 20590. 

FOR FURTHER INFORMATION CONTACT: 

Myles Jalalian, Aviation Safety 

Engineer, Atlanta ACO Branch, FAA, 

1701 Columbia Avenue, College Park, 

GA 30337; phone: (404) 474–5572; fax: 

(404) 474–5606; email: myles.jalalian@

faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued an NPRM that 

proposed to amend 14 CFR part 39 by 

adding an AD that would apply to 

certain serial-numbered Gulfstream 

Model GVII–G600 airplanes. The NPRM 

published in the Federal Register on 

February 23, 2021 (86 FR 10875). The 

NPRM was prompted by a report of a 

failure mode in the DCN software that 

causes pitch attitude value to freeze on 

the PFD for up to 20 seconds, which 

results in temporarily incorrect pitch 

indications. 

The effect is evident only if the pitch 

of the airplane changes during the 20 

second reset window. After 20 seconds, 

the system returns to normal. The 

standby flight display and heads up 

display are unaffected by this failure 

mode and continue to display the 

correct pitch attitude. However, there is 

not an alert or annunciation that 

informs the flight crew of a stale (frozen) 

pitch display or potentially misleading 

flight information. 

The NPRM proposed to require 

installing the MOS software update part 

number EB60001034–0106, updating 

the DCN software level to version 

10.10.12 in support of the MOS software 

update, and operationally checking the 

installations. Incorrect pitch indications 

could result in the loss of control of the 

airplane during certain phases of flight 

during instrument meteorological 

conditions. 

Actions Since the NPRM Was Issued 

After issuance of the NPRM, the FAA 

received a comment from Gulfstream 

recommending the FAA withdraw the 

NPRM based on full fleet compliance. 

All Gulfstream Model GVII–G600 

airplanes have corrected the unsafe 

condition by complying with the 

proposed software update. The FAA has 

determined that the unsafe condition 

has been removed from the fleet. In 

addition, since Gulfstream controls the 

software, it is unlikely the unsafe 

condition will be re-introduced. 


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