17326 Federal Register / Vol. 86, No. 62 / Friday, April 2, 2021 / Proposed Rules 
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: 
The Boeing Company: Docket No. FAA– 
2021–0017; Project Identifier AD–2020– 
01186–T. 
(a) Comments Due Date 
The FAA must receive comments on this 
airworthiness directive (AD) by May 17, 2021. 
(b) Affected ADs 
None. 
(c) Applicability 
This AD applies to The Boeing Company 
Model 737–8 and 737–9 airplanes, 
certificated in any category, as identified in Boeing Special Attention Requirements Bulletin 737–28–1363 RB, dated June 2, 2020. 
(d) Subject 
Air Transport Association (ATA) of 
America Code 28, Fuel. (e) Unsafe Condition 
This AD was prompted by a report that 
during refueling of the right main tank, if 
there is a failure of the automatic shutoff system, the refueling panel does not provide the required flashing indication that the automatic shutoff has failed to shut off the fuel. The FAA is issuing this AD to address this indication failure to warn the person fueling the airplane, which could cause overfill of the right main tank, spilled fuel, and pooling on the ground that could come in contact with an ignition source, resulting in a ground fire. 
(f) Compliance 
Comply with this AD within the 
compliance times specified, unless already 
done. 
(g) Required Actions 
Except as specified by paragraph (h) of this 
AD, at the applicable times specified in the 
‘‘Compliance’’ paragraph of Boeing Special Attention Requirements Bulletin 737–28– 1363 RB, dated June 2, 2020, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention 
Requirements Bulletin 737–28–1363 RB, dated June 2, 2020. 
Note 1 to paragraph (g): Guidance for 
accomplishing the actions required by this AD can be found in Boeing Special Attention 
Service Bulletin 737–28–1363, dated June 2, 2020, which is referred to in Boeing Special Attention Requirements Bulletin 737–28– 1363 RB, dated June 2, 2020. 
(h) Exception to Service Information 
Specifications 
Where Boeing Special Attention 
Requirements Bulletin 737–28–1363 RB, 
dated June 2, 2020, uses the phrase ‘‘the Original Issue date of Requirements Bulletin 737–28–1363 RB,’’ this AD requires using ‘‘the effective date of this AD.’’ 
(i) Alternative Methods of Compliance 
(AMOCs) 
(1) The Manager, Seattle 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 responsible Flight Standards 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 (j)(1) of this AD. Information may be emailed to: 9- ANM-Seattle-ACO-AMOC-Requests@faa.gov. 
(2) Before using any approved AMOC, 
notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office. 
(3) An AMOC that provides an acceptable 
level of safety may be used for any repair, modification, or alteration required by this AD if it is approved by The Boeing Company Organization Designation Authorization (ODA) that has been authorized by the Manager, Seattle ACO Branch, FAA, to make those findings. To be approved, the repair method, modification deviation, or alteration deviation must meet the certification basis of the airplane, and the approval must specifically refer to this AD. 
(j) Related Information 
(1) For more information about this AD, 
contact Chris Baker, Aerospace Engineer, 
Propulsion Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206–231–3552; email: christopher.r.baker@faa.gov. 
(2) For service information identified in 
this AD, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., MC 110–SK57, Seal Beach, CA 90740–5600; telephone 562–797–1717; internet https://www.myboeingfleet.com. You may view this 
referenced service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 206–231–3195. Issued on January 27, 2021. 
Lance T. Gant, 
Director, Compliance & Airworthiness 
Division, Aircraft Certification Service. 
[FR Doc. 2021–06726 Filed 4–1–21; 8:45 am] 
BILLING CODE 4910–13–P 
DEPARTMENT OF TRANSPORTATION 
Federal Aviation Administration 
14 CFR Part 39 
[Docket No. FAA–2021–0257; Project 
Identifier MCAI–2020–00712–E] 
RIN 2120–AA64 
Airworthiness Directives; Rolls-Royce 
Deutschland Ltd & Co KG (Type Certificate Previously Held by Rolls- Royce Deutschland GmbH, Formerly BMW Rolls-Royce GmbH) Turbofan Engines 
AGENCY : Federal Aviation 
Administration (FAA), DOT. 
ACTION : Notice of proposed rulemaking 
(NPRM). 
SUMMARY : The FAA proposes to adopt a 
new airworthiness directive (AD) for certain Rolls-Royce Deutschland Ltd & Co KG (type certificate previously held by Rolls-Royce Deutschland GmbH, formerly BMW Rolls-Royce GmbH) (RRD) BR700–710A2–20 model turbofan engines. This proposed AD was prompted by flight data obtained from airplanes equipped with certain Rockwell Collins avionics and auto- throttle systems that demonstrated significant oscillation of the engine rotor revolution speed during flight. This proposed AD would require initial and repetitive recalculation of the consumed and remaining service life of certain life- limited parts (LLPs). This proposed AD would also require removal of an LLP prior to its approved life limit or within 90 days after the effective date of this AD, whichever occurs later. 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 May 17, 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. 
VerDate Sep<11>2014 16:28 Apr 01, 2021 Jkt 253001 PO 00000 Frm 00005 Fmt 4702 Sfmt 4702 E:\FR\FM\02APP1.SGM 02APP1jbell on DSKJLSW7X2PROD with PROPOSALS17327 Federal Register / Vol. 86, No. 62 / Friday, April 2, 2021 / Proposed Rules 
•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 Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11, Dahlewitz, 15827 Blankenfelde- Mahlow, Germany; phone: +49 (0) 33 7086–4040; website: https://www.rolls- royce.com/contact-us.aspx. You may 
view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA 01803. For information on the availability of this material at the FAA, call (781) 238– 7759. 
Examining the AD Docket 
You may examine the AD docket at 
https://www.regulations.gov by 
searching for and locating Docket No. 
FAA–2021–0257; 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 mandatory continuing airworthiness information (MCAI), any comments received, and other information. The street address for Docket Operations is listed above. 
FOR FURTHER INFORMATION CONTACT : 
Wego Wang, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: (781) 238–7134; fax: (781) 238–7199; email: Wego.Wang@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–2021–0257; Project Identifier MCAI–2020–00712–E’’ 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 FAA 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 final rule 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 final rule, 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 final rule. Submissions containing CBI should be sent to Wego Wang, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803. 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 Community, has issued EASA AD 2018–0268, dated December 11, 2018 and corrected on February 20, 2019 (referred to after this as ‘‘the MCAI’’), to address the unsafe condition on these products. The MCAI states: 
Flight data obtained from aeroplanes 
equipped with certain Rockwell Collins 
avionics and auto-throttle system demonstrated significant oscillation of the engine rotor revolution speed during cruise. Analysis indicates that this affects the service life of the affected LLP. 
This condition, if not corrected, may lead 
to failure of an affected LLP, possibly resulting in release of high-energy debris, with consequent damage to, and/or reduced control of, the aeroplane. 
To address this potentially unsafe 
condition, RRD issued the NMSB, providing instructions to recalculate the consumed and remaining service life of the affected LLP. 
For the reasons described above, this 
[EASA] AD requires repetitive recalculation of the service life (consumed and remaining) 
of each affected LLP and, depending on the results, replacement of each affected LLP before exceeding the life limit, taking the re- calculated life consumption into account. 
You may obtain further information 
by examining the MCAI in the AD 
docket at https://www.regulations.gov by searching for and locating Docket No. FAA–2021–0257. FAA’s Determination 
This product has been approved by 
EASA and is approved for operation in 
the United States. Pursuant to our bilateral agreement with the European Community, EASA has notified us of the unsafe condition described in the MCAI and service information referenced above. The FAA is proposing this AD because the agency evaluated all the relevant information provided by EASA and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design. 
Related Service Information Under 1 
CFR Part 51 
The FAA reviewed RRD Alert Non- 
Modification Service Bulletin (NMSB) SB–BR700–72–A900584, Revision 2, dated November 22, 2017 (the NMSB). The NMSB describes procedures for amending flight cycle counting requirements for affected LLPs on RRD BR700–710A2–20 model turbofan engines. 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 reviewed Bombardier 
Service Bulletin (SB) 700–34–5021, Revision 03, dated January 5, 2018, and Bombardier SB 700–34–6021, Revision 03, dated January 5, 2018. These SBs describe procedures for the implementation of the Global Vision Flight Deck Version 5 (V5) software load on Bombardier Inc. Model BD–700– 1A11 and BD–700–1A10 airplanes, respectively. 
Proposed AD Requirements in This 
NPRM 
This proposed AD would require 
repetitive recalculation of the consumed and remaining service life of certain LLPs and replacement of any LLP that has exceeded its approved life limit. 
Differences Between This Proposed AD 
and the MCAI or Service Information 
EASA AD 2018–0268 includes in its 
applicability engines installed and operated on a pre-mod airplane during a period of 24 months prior to the current installation. Instead of a period of 24 months, this AD proposes to apply to engines installed and operated on a pre-mod airplane at any time after January 1, 2017 to adjust for the additional time since publication of the EASA AD. 
In addition, EASA AD 2018–0268 
requires an initial recalculation of 
VerDate Sep<11>2014 16:28 Apr 01, 2021 Jkt 253001 PO 00000 Frm 00006 Fmt 4702 Sfmt 4702 E:\FR\FM\02APP1.SGM 02APP1jbell on DSKJLSW7X2PROD with PROPOSALS17328 Federal Register / Vol. 86, No. 62 / Friday, April 2, 2021 / Proposed Rules 
consumed and remaining service life of 
the low-pressure compressor (LPC) disk at each engine removal for maintenance within 250 flight cycles or 12 months, whichever occurs first after its effective 
date. EASA AD 2018–0268 also requires recalculation of the consumed and remaining life of the other affected LLPs after this period. This proposed AD does not include the initial recalculation of the consumed and remaining life of the LPC disk, but requires recalculation of 
consumed and remaining service life of the disk and all other affected LLPs within 90 days after the effective date of this proposed AD. The FAA determined that the initial recalculation of the consumed and remaining service life of the LPC disk, separately from the other LLPs, is not needed to resolve the unsafe condition because the 12-month initial inspection period in EASA AD 2018–0268 has passed. 
Costs of Compliance 
The FAA estimates that this AD, if 
adopted as proposed, would affect 284 
engines installed on 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 
Recalculate service life for affected LLPs ...... 20 work-hours × $85 per hour = $85 ............. $0 $1,700 $482,800 
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: 
Rolls-Royce Deutschland Ltd & Co KG (Type 
Certificate Previously held by Rolls- 
Royce Deutschland GmbH, Formerly BMW Rolls-Royce GmbH): Docket No. FAA–2021–0257; Project Identifier MCAI–2020–00712–E. 
(a) Comments Due Date 
The FAA must receive comments on this 
airworthiness directive (AD) by May 17, 2021. 
(b) Affected ADs 
None. 
(c) Applicability 
This AD applies to Rolls-Royce 
Deutschland Ltd & Co KG (Type Certificate 
previously held by Rolls-Royce Deutschland GmbH, formerly BMW Rolls-Royce GmbH) (RRD) BR700–710A2–20 model turbofan engines: 
(1) Installed and operated on a Bombardier 
Model BD–700–1A10 and BD–700–1A11 airplane, with serial number 9381, 9386, 9401, or 9432 to 9786, inclusive, that have not incorporated Bombardier Service Bulletin (SB) 700–34–5021, Revision 3, dated January 5, 2018 or Bombardier SB 700–34–6021, Revision 3, dated January 5, 2018, as applicable, referred to after this as a ‘‘pre- 
mod airplane,’’ or 
(2) Installed and operated on a pre-mod 
airplane at any time after January 1, 2017. 
(d) Subject 
Joint Aircraft System Component (JASC) 
Code 7230, Turbine Engine Compressor 
Section. 
(e) Unsafe Condition 
This AD was prompted by flight data 
obtained from airplanes equipped with 
certain Rockwell Collins avionics and auto- throttle systems which demonstrated significant oscillation of the engine rotor revolution speed during flight. The FAA is issuing this AD to prevent failure of an affected life-limited part (LLP). The unsafe condition, if not addressed, could result in uncontained release of high-energy debris, damage to the engine, and damage to the airplane. 
(f) Compliance 
Comply with this AD within the 
compliance times specified, unless already 
done. 
(g) Required Actions 
(1) Within 90 days after the effective date 
of this AD, recalculate the consumed and 
remaining service life of each affected LLP 
using Accomplishment Instructions, paragraph 3.D., of RRD Alert Non- Modification Service Bulletin (NMSB) SB– BR700–72–A900584, Revision 2, dated November 22, 2017 (the NMSB). 
(2) For engines installed and operated on 
a pre-mod airplane, after performing the initial recalculations required by paragraph (g)(1) of this AD, for each flight, calculate the consumed and remaining service life of each affected LLP using paragraph 3.D. of the Accomplishment Instructions of the NMSB. 
(3) Remove each affected LLP prior to 
exceeding its approved life limit or within 90 days after the effective date of this AD, whichever occurs later. 
(h) Credit for Previous Actions 
You may take credit for the recalculation 
of the consumed and remaining service life 
of each LLP required by paragraph (g)(1) of this AD if the action was performed before 
VerDate Sep<11>2014 17:07 Apr 01, 2021 Jkt 253001 PO 00000 Frm 00007 Fmt 4702 Sfmt 4702 E:\FR\FM\02APP1.SGM 02APP1jbell on DSKJLSW7X2PROD with PROPOSALS17329 Federal Register / Vol. 86, No. 62 / Friday, April 2, 2021 / Proposed Rules 
the effective date of this AD using RRD Alert 
NMSB SB–BR700–72–A900584, Revision 1, dated October 5, 2017, or original issue, dated January 31, 2017. 
(i) Definition 
For the purpose of this AD, an affected LLP 
is: an LPC disk, LPC fan blade, fan shaft, low- 
pressure turbine (LPT) stage 1 disk, LPT stage 2 disk, LPT rotor shaft and annulus filler, high-pressure compressor (HPC) stage 1–6 rotor disk, HPC stage 7–10 rotor disk, curvic ring, high pressure turbine (HPT) stage 1 disk, and an HPT stage 2 disk. 
(j) Alternative Methods of Compliance 
(AMOCs) 
(1) The Manager, ECO 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. You may email your request to: ANE-AD-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 more information about this AD, 
contact Wego Wang, Aviation Safety 
Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: (781) 238–7134; fax: (781) 238–7199; email: Wego.Wang@faa.gov . 
(2) Refer to European Union Aviation 
Safety Agency (EASA) AD 2018–0268, dated December 11, 2018, 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–2021–0257. 
(3) For service information identified in 
this AD, contact Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11, Dahlewitz, 15827 Blankenfelde-Mahlow, Germany; phone: +49 (0) 33 7086–4040; website: https://www.rolls- royce.com/contact-us.aspx. You may view 
this referenced service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA 01803. For information on the availability of this material at the FAA, call (781) 238–7759. 
Issued on March 29, 2021. 
Lance T. Gant, 
Director, Compliance & Airworthiness 
Division, Aircraft Certification Service. 
[FR Doc. 2021–06800 Filed 4–1–21; 8:45 am] 
BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION 
Federal Aviation Administration 
14 CFR Part 39 
[Docket No. FAA–2020–0985; Project 
Identifier 2018–SW–064–AD] 
RIN 2120–AA64 
Airworthiness Directives; Airbus 
Helicopters Deutschland GmbH 
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) that would have applied to certain Airbus Helicopters Deutschland GmbH Model EC135P1, EC135T1, EC135P2, EC135T2, EC135P2+, EC135T2+, EC135P3, and EC135T3 helicopters. The NPRM was prompted by a deviation from a new manufacturing process and a determination that the deviation resulted in a reduced life limit (service life limit) for certain tail rotor (TR) blades. The NPRM would have required a reduced life limit for those TR blades and require a new life limit for certain other TR blades. Since issuance of the NPRM, the FAA has determined that the deviation from the new manufacturing process does not reduce the life limit of certain TR blades and that a new life limit is not needed for certain other blades. Accordingly, the NPRM is withdrawn. 
DATES : As of April 2, 2021, the proposed 
rule, which was published in the Federal Register on November 9, 2020 (85 FR 71286), is withdrawn. 
ADDRESSES : 
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–2020– 0985; 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, 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 : 
Kristin Bradley, Aerospace Engineer, General Aviation & Rotorcraft Section, International Validation Branch, Compliance & Airworthiness Division, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 817–222– 5110; email Kristin.Bradley@faa.gov. 
SUPPLEMENTARY INFORMATION : 
Discussion 
The FAA has issued an NPRM that 
proposed to amend 14 CFR part 39 by adding an AD that would apply to the specified products. The NPRM was published in the Federal Register on 
November 9, 2020 (85 FR 71286). The NPRM was prompted by a deviation from a new manufacturing process and a determination that the deviation resulted in a reduced life limit (service life limit) for certain TR blades. 
The NPRM proposed to require a 
reduced life limit for those TR blades and require a new life limit for certain other TR blades. 
Actions Since the NPRM was Issued 
Since issuance of the NPRM, the FAA 
determined that the deviation from the 
new manufacturing process does not reduce the life limit of certain TR blades and that a new life limit is not needed for certain other blades. Affected parts can continue operation until the normal life limit with no compensation factor applied to reduce the life of the part. Therefore, the FAA has determined that AD action is not appropriate. 
Withdrawal of the NPRM constitutes 
only such action and does not preclude the FAA from further rulemaking on this issue, nor does it commit the FAA to any course of action in the future. 
Comments 
The FAA gave the public the 
opportunity to comment on the NPRM. 
The following presents the comments received on the NPRM and the FAA’s response to each comment. 
Request To Withdraw NPRM 
Airbus Helicopters requested that the 
NPRM be withdrawn. The commenter 
stated that EASA would be cancelling EASA AD 2018–0168, dated July 27, 2018, which prompted this NPRM. The commenter also noted that Airbus Helicopters service information was revised to remove the reduced life limit for the TR blades. 
The FAA agrees with the commenter’s 
request. Since publication of the NPRM, EASA has issued EASA AD 2018– 0168R1, dated December 18, 2020 (EASA AD 2018–0168R1). EASA has determined, and the FAA concurs, that the deviation in the new manufacturing process does not affect the life limit of the TR blades. Airbus Helicopters has revised the corresponding service information accordingly. The revised EASA AD allows continued operation of 
VerDate Sep<11>2014 16:28 Apr 01, 2021 Jkt 253001 PO 00000 Frm 00008 Fmt 4702 Sfmt 4702 E:\FR\FM\02APP1.SGM 02APP1jbell on DSKJLSW7X2PROD with PROPOSALS