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Federal Register / Vol. 86, No. 108 / Tuesday, June 8, 2021 / Proposed Rules
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 Managers approval letter must specifically refer to this AD.
5 Where the service information referred to in EASA AD 20210099 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 20210099 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 20210099 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.

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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 k2 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 20210099, 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 6N321, Fort Worth, TX 76177.
For information on the availability of this material at the FAA, call 8172225110. This material may be found in the AD docket on the internet at https www.regulations.gov
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by searching for and locating Docket No.
FAA20210453.
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 2313218; email kathleen.arrigotti@faa.gov.
Issued on June 2, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202111965 Filed 6721; 8:45 am
any comments received, and other information. The street address for Docket Operations is U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 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 4745572; fax:
404 4745606; email: myles.jalalian@
faa.gov.
SUPPLEMENTARY INFORMATION:

BILLING CODE 491013P

Background DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
FAA Docket No. FAA20200994; Project Identifier AD202000687T
RIN 2120AA64

Airworthiness Directives; Gulfstream Aerospace Corporation Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Proposed rule; withdrawal.
AGENCY:

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 GVIIG600
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:
SUMMARY:

Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20200994; 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,
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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 GVIIG600 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 EB600010340106, 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 GVIIG600
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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