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(b) Affected ADs (ii) If the inspection was done before the DEPARTMENT OF TRANSPORTATION None. effective date of this AD: Submit the report within 14 days after the effective date of this Federal Aviation Administration (c) Applicability AD. This AD applies to Leonardo S.p.a. Model (7) This AD does not require the 14 CFR Part 39 A109A, A109A II, A109C, A109E, A109K2, ‘‘Remarks’’ section of EASA AD 2018–0280. A109S, AW109SP, A119, and AW119 MKII [Docket No. FAA–2021–0660; Project helicopters, certificated in any category, with (i) Special Flight Permit Identifier AD–2021–00398–T] an affected part as identified in European Special flight permits, as described in 14 Aviation Safety Agency (now European RIN 2120–AA64 CFR 21.197 and 21.199, are not allowed. Union Aviation Safety Agency) (EASA) AD 2018–0280, dated December 17, 2018 (EASA Airworthiness Directives; Learjet Inc. (j) Alternative Methods of Compliance Airplanes AD 2018–0280). (AMOCs) (d) Subject (1) The Manager, International Validation AGENCY: Federal Aviation Joint Service Component (JASC) Branch, FAA, has the authority to approve Administration (FAA), DOT. Codes: 6700, Rotorcraft Flight Control; 6730, AMOCs for this AD, if requested using the ACTION: Notice of proposed rulemaking Rotorcraft Servo System. procedures found in 14 CFR 39.19. In (NPRM). (e) Unsafe Condition accordance with 14 CFR 39.19, send your request to your principal inspector or local SUMMARY: The FAA proposes to adopt a This AD was prompted by a report of Flight Standards District Office, as new airworthiness directive (AD) for damage to a rigid connecting link (rod), and certain Learjet Inc. Model 45 airplanes. loosening of the nut on the upper rod end. appropriate. If sending information directly The FAA is issuing this AD to address to the manager of the International Validation This proposed AD was prompted by a damage to the rod, and loosening of the nut Branch, send it to the attention of the person report of a fuel leak due to a cracked on the upper rod end. The unsafe condition, identified in paragraph (k)(2) of this AD. fuel line between the engine fuel control if not addressed, could result in failure of the Information may be emailed to: 9-AVS-AIR- and the engine fuel flow meter. This rod, possibly resulting in reduced control of [email protected]. proposed AD would require replacing the helicopter. (2) Before using any approved AMOC, the existing fuel flow meter bracket (f) Compliance notify your appropriate principal inspector, assembly with a redesigned bracket or lacking a principal inspector, the manager Comply with this AD within the assembly and reporting information to compliance times specified, unless already of the local flight standards district office/ the FAA. The FAA is proposing this AD done. certificate holding district office. to address the unsafe condition on these products. (g) Requirements (k) Related Information DATES: The FAA must receive comments Except as specified in paragraph (h) of this (1) For EASA AD 2018–0280, contact on this proposed AD by September 27, AD: Comply with all required actions and EASA, Konrad-Adenauer-Ufer 3, 50668 2021. compliance times specified in, and in Cologne, Germany; phone: +49 221 8999 000; accordance with, EASA AD 2018–0280. email: [email protected]; internet ADDRESSES: You may send comments, (h) Exceptions to EASA AD 2018–0280 www.easa.europa.eu. You may view this using the procedures found in 14 CFR 11.43 and 11.45, by any of the following (1) Where EASA AD 2018–0280 requires material at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood methods: compliance in terms of flight hours, this AD • requires using hours time-in-service. Pkwy., Room 6N–321, Fort Worth, TX 76177. Federal eRulemaking Portal: Go to (2) Where EASA AD 2018–0280 requires For information on the availability of this https://www.regulations.gov. Follow the compliance from its effective date, this AD material at the FAA, call (817) 222–5110. instructions for submitting comments. requires using the effective date of this AD. This material may be found in the AD docket • Fax: (202) 493–2251. (3) Where EASA AD 2018–0280 specifies at https://www.regulations.gov by searching • Mail: U.S. Department of action if ‘‘any discrepancy’’ is found, for this for and locating Docket No. FAA–2021–0659. Transportation, Docket Operations, M– AD, discrepancies include damage, cracks, (2) For more information about this AD, 30, West Building Ground Floor, Room and evidence of abnormal play. contact Darren Gassetto, Aerospace Engineer, W12–140, 1200 New Jersey Avenue SE, (4) Where the service information specified COS Program Management Section, Washington, DC 20590. in EASA AD 2018–0280 specifies to ‘‘replace • the damaged connecting link’’, for this AD, Operational Safety Branch, Compliance & Hand Delivery: Deliver to Mail if any damage or cracks are found, remove Airworthiness Division, FAA, 1600 Stewart address above between 9 a.m. and 5 the rod from service. Ave., Suite 410, Westbury, NY 11590; phone: p.m., Monday through Friday, except (5) Where the service information specified (516) 228–7323; email: Darren.Gassetto@ Federal holidays. in EASA AD 2018–0280 specifies to ‘‘contact faa.gov. For service information identified in Leonardo Helicopters’’ if abnormal play is Issued on August 4, 2021. this NPRM, contact Learjet Inc., One detected, for this AD if any abnormal play is Learjet Way, Wichita, KS 67209; phone: detected, corrective action must be Lance T. Gant, accomplished using a method approved by (316) 946–2000; email: ac.ict@ Director, Compliance & Airworthiness aero.bombardier.com; website: https:// the Manager, International Validation Division, Aircraft Certification Service. Branch, FAA; or EASA; or Leonardo S.p.a.’s businessaircraft.bombardier.com/en/ EASA Design Organization Approval (DOA). [FR Doc. 2021–17046 Filed 8–12–21; 8:45 am] aircraft/Learjet.html. You may view this If approved by the DOA, the approval must BILLING CODE 4910–13–P service information at the FAA, include the DOA-authorized signature. Airworthiness Products Section, (6) Where EASA AD 2018–0280 requires Operational Safety Branch, 901 Locust, reporting inspection results to Leonardo Kansas City, MO 64106. For information S.p.a. within 14 days after the effective date of EASA AD 2018–0280, this AD requires on the availability of this material at the reporting inspection results at the applicable FAA, call (816) 329–4148. time in paragraph (h)(6)(i) or (ii) of this AD. Examining the AD Docket (i) If the inspection was done on or after the effective date of this AD: Submit the You may examine the AD docket at report within 14 days after the inspection. https://www.regulations.gov by

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searching for and locating Docket No. as ‘‘PROPIN.’’ The FAA will treat such procedures for replacing the existing FAA–2021–0660; or in person at Docket marked submissions as confidential fuel flow meter bracket assembly with a Operations between 9 a.m. and 5 p.m., under the FOIA, and they will not be redesigned bracket assembly with pad Monday through Friday, except Federal placed in the public docket of this fuel flow meter that has an increased holidays. The AD docket contains this NPRM. Submissions containing CBI material thickness. These documents are NPRM, any comments received, and should be sent to James Galstad, distinct since they apply to different other information. The street address for Aviation Safety Engineer, or Thomas airplane models. This service Docket Operations is listed above. Teplik, Aviation Safety Engineer, information is reasonably available FOR FURTHER INFORMATION CONTACT: Wichita ACO Branch, FAA, 1801 S because the interested parties have James Galstad, Aviation Safety Engineer, Airport Road, Wichita, KS 67209. Any access to it through their normal course Wichita ACO Branch, FAA, 1801 S commentary that the FAA receives of business or by the means identified Airport Road, Wichita, KS 67209; which is not specifically designated as in ADDRESSES. phone: (316) 946–4135; email: CBI will be placed in the public docket for this rulemaking. Proposed AD Requirements in This [email protected] or Wichita-COS@ NPRM faa.gov; or Thomas Teplik, Aviation Background Safety Engineer, Wichita ACO Branch, This proposed AD would require The FAA received a report of a fuel FAA, 1801 S Airport Road, Wichita, KS accomplishing the actions specified in leak due to a cracked fuel line between 67209; phone: (316) 946–4196; email: the service information already the engine fuel control and the engine [email protected] or Wichita-COS@ described, except as discussed under fuel flow meter on a Learjet Model 45 faa.gov. ‘‘Differences Between this Proposed AD () airplane. There are four and the Service Information.’’ SUPPLEMENTARY INFORMATION: different Model 45 configurations: Comments Invited Model 45 (), Model 45 (Learjet Differences Between This Proposed AD 45), Model 45 (Learjet 70), and Model 45 and the Service Information The FAA invites you to send any (Learjet 75). They all are susceptible to written relevant data, views, or This proposed AD would require cracked fuel lines with possible fuel reporting certain maintenance arguments about this proposal. Send leakage because the fuel flow meter your comments to an address listed information to the FAA, where the bracket and fuel line is common to each service information does not. The under ADDRESSES. Include ‘‘Docket No. model. Further analysis of the fleet of all FAA–2021–0660; Project Identifier AD– information provided in the reports the 45 models revealed similar failures would be related to contributing factors 2021–00398–T’’ at the beginning of your in this area including the following: 16 comments. The most helpful comments that the FAA found showed a fuel line failures, 2 instances of multiple correlation between the reported engine reference a specific portion of the inlet attaching bolts breaking, 9 leaking proposal, explain the reason for any fan vibration levels and the cracking fuel controls, a broken gearbox strut, 4 fuel line between engine fuel control recommended change, and include cracked No. 6 bearing oil supply lines, supporting data. The FAA will consider and the engine fuel flow meter and a and 7 cracked engine oil tanks. The correlation between the cracking fuel all comments received by the closing FAA evaluated the flammable fluid date and may amend this proposal line and a certain batch of fan disks. In leaks and broken parts and determined addition, the FAA found that a because of those comments. that they may have resulted from Except for Confidential Business contributing factor could be the vibration. susceptibility of the fuel flow meter Information (CBI) as described in the Following the above report and following paragraph, and other bracket assembly and the susceptibility analysis, Learjet designed a new engine of the bracket assembly with pad fuel information as described in 14 CFR fuel flow meter bracket and 11.35, the FAA will post all comments flow meter to the vibration induced. The incorporated it during production. The requested reporting information would received, without change, to https:// unsafe condition, if not addressed, www.regulations.gov, including any allow the FAA to determine whether could result in an engine installation further rulemaking action would be personal information you provide. The fire, which could progress to an agency will also post a report necessary to mitigate the unsafe uncontrolled fire and consequent loss of condition. summarizing each substantive verbal control of the airplane. contact received about this NPRM. Also, the effectivity of Bombardier FAA’s Determination Learjet 45 SB 45–73–2, Revision 1, Confidential Business Information The FAA is issuing this NPRM after dated January 9, 2017, begins with serial CBI is commercial or financial determining that the unsafe condition number 45–005. This proposed AD information that is both customarily and described previously is likely to exist or would also apply to airplane serial actually treated as private by its owner. develop on other products of the same numbers 45–002 through 45–004 Under the Freedom of Information Act type design. because, although these three airplanes (FOIA) (5 U.S.C. 552), CBI is exempt are not currently in service, they are from public disclosure. If your Related Service Information Under 1 subject to the unsafe condition. Thus, it comments responsive to this NPRM CFR Part 51 is necessary to include them in the contain commercial or financial The FAA reviewed Bombardier event they are returned to service. information that is customarily treated Learjet 40 Service Bulletin (SB) SB 40– Costs of Compliance as private, that you actually treat as 73–01, Revision 1, Bombardier Learjet private, and that is relevant or 45 SB 45–73–2, Revision 1, Bombardier The FAA estimates that this AD, if responsive to this NPRM, it is important Learjet 70 SB 70–73–01, Revision 1, and adopted as proposed, would affect 443 that you clearly designate the submitted Bombardier Learjet 75 SB 75–73–01, airplanes of U.S. registry. comments as CBI. Please mark each Revision 2, all dated January 9, 2017. The FAA estimates the following page of your submission containing CBI This service information specifies costs to comply with this proposed AD:

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ESTIMATED COSTS

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

Replacing the bracket assembly ...... 4.5 work-hours × $85 per hour = $382.50 .. $3,895 ...... $4,277.50 $1,894,932.50 Reporting and reviewing logbooks ...... 9 work-hours × $85 per hour = $765 ...... Not Applicable .... 765 338,895

Paperwork Reduction Act 13132. This proposed AD would not (e) Unsafe Condition A federal agency may not conduct or have a substantial direct effect on the This AD was prompted by a report of a fuel sponsor, and a person is not required to States, on the relationship tween the leak due to a cracked fuel line between the respond to, nor shall a person be subject national government and the States, or engine fuel control and the engine fuel flow on the distribution of power and meter. The FAA is issuing this AD to prevent to a penalty for failure to comply with cracking and failures. The unsafe condition, a collection of information subject to the responsibilities among the various levels of government. if not addressed, could result in an engine requirements of the Paperwork installation fire, which could progress to an Reduction Act unless that collection of For the reasons discussed above, I uncontrolled fire and consequent loss of information displays a current valid certify this proposed regulation: control of the airplane. (1) Is not a ‘‘significant regulatory OMB Control Number. The OMB (f) Compliance Control Number for this information action’’ under Executive Order 12866, (2) Would not affect intrastate collection is 2120–0056. Public Comply with this AD within the aviation in Alaska, and compliance times specified, unless already reporting for this collection of (3) Would not have a significant done. information is estimated to take economic impact, positive or negative, approximately 9 hours per response, (g) Reporting Requirement on a substantial number of small entities including the time for reviewing Within 60 days after the effective date of under the criteria of the Regulatory instructions, searching existing data this AD, report the following information, Flexibility Act. sources, gathering and maintaining the where available, to the Wichita ACO Branch data needed, and completing and List of Subjects in 14 CFR Part 39 via email at [email protected], reviewing the collection of information. [email protected], and Wichita-COS@ Air transportation, Aircraft, Aviation faa.gov; or by mail to Wichita ACO Branch, All responses to this collection of safety, Incorporation by reference, Attn: James Galstad/Thomas Teplik, 1801 S information are mandatory. Send Safety. Airport Road, Room 100, Wichita, KS 67209. comments regarding this burden (1) Name of the owner; the address of the estimate or any other aspect of this The Proposed Amendment owner; name of the organization doing the collection of information, including Accordingly, under the authority actions required by this AD; the date the suggestions for reducing this burden, to: delegated to me by the Administrator, actions were completed; the name of the Information Collection Clearance the FAA proposes to amend 14 CFR part person submitting the report; the address, telephone number, and email of the person Officer, Federal Aviation 39 as follows: Administration, 10101 Hillwood submitting the report. Parkway, Fort Worth, TX 76177–1524. (2) The fan vibration levels that have been PART 39—AIRWORTHINESS recorded in the airplane and engine Authority for This Rulemaking DIRECTIVES maintenance records since November 1, 2019. Include the airplane and engine serial ■ Title 49 of the United States Code 1. The authority citation for part 39 numbers. specifies the FAA’s authority to issue continues to read as follows: (3) The date of each vibration level rules on aviation safety. Subtitle I, Authority: 49 U.S.C. 106(g), 40113, 44701. recorded and the associated hours time-in- section 106, describes the authority of service for the airplane and each engine. the FAA Administrator. Subtitle VII: § 39.13 [Amended] (4) For each fan vibration level reported, Aviation Programs, describes in more ■ 2. The FAA amends § 39.13 by adding include: detail the scope of the Agency’s the following new airworthiness (i) Whether molybdenum coating for the authority. directive: fan was applied per Temporary Revision 72– 494, dated August 15, 2017 (or as The FAA is issuing this rulemaking Learjet Inc.: Docket No. FAA–2021–0660; under the authority described in subsequently incorporated into the engine’s Project Identifier AD–2021–00398–T. Inspection/Repair Manual TFE731 (ATA Subtitle VII, Part A, Subpart III, Section (a) Comments Due Date Number 72–IR–02). 44701: General requirements. Under (ii) If molybdenum coating was applied that section, Congress charges the FAA The FAA must receive comments on this using a different process than Temporary with promoting safe flight of civil airworthiness directive (AD) by September Revision 72–494, dated August 15, 2017 (or aircraft in air commerce by prescribing 27, 2021. as subsequently incorporated into the regulations for practices, methods, and (b) Affected ADs engine’s Inspection/Repair Manual TFE731 (ATA Number 72–IR–02), report the process procedures the Administrator finds None. necessary for safety in air commerce. by which the molybdenum coating was This regulation is within the scope of (c) Applicability applied and the revision level of the This AD applies to Learjet Inc. Model 45 document defining the application process that authority because it addresses an for the molybdenum coating. unsafe condition that is likely to exist or (Learjet 40), Model 45 (Learjet 45), Model 45 Note 1 to paragraph (g)(4): Temporary develop on products identified in this (Learjet 70), and Model 45 (Learjet 75) airplanes, serial numbers 45–002 through 45– Revision 72–494, dated August 15, 2017, rulemaking action. 556 and 45–2001 through 45–2146, specifies applying a dry film lubricant on the Regulatory Findings certificated in any category. mating surfaces of the fan hub and the fan blades. The lubricating solid for this dry film The FAA determined that this (d) Subject lubricant is molybdenum disulfide, which is proposed AD would not have federalism Joint Aircraft System Component (JASC) referred to in this AD as molybdenum implications under Executive Order Code 7100, Powerplant System. coating.

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(5) For each fan vibration level reported, (k) Related Information incorporate new or more restrictive the fan hub serial number and hours time-in- (1) For more information about this AD, airworthiness limitations, as specified service for this fan hub. contact James Galstad, Aviation Safety in a European Union Aviation Safety (6) Installation date and service bulletin Engineer, Wichita ACO Branch, FAA, 1801 S Agency (EASA) AD, which is proposed (SB) revision level for the installation of the Airport Road, Wichita, KS 67209; phone: for incorporation by reference. The FAA bracket assembly with pad fuel flow meter (316) 946–4135; email: james.galstad@ is proposing this AD to address the and hose if installed before the effective date faa.gov or [email protected]; or Thomas unsafe condition on these products. of this AD. Teplik, Aviation Safety Engineer, Wichita (7) Any failures of the bracket assembly ACO Branch, FAA, 1801 S Airport Road, DATES: The FAA must receive comments with pad fuel flow meter and hose installed Wichita, KS 67209; phone: (316) 946–4196; on this proposed AD by September 27, in accordance with any SB listed in email: [email protected]. 2021. paragraph (h) or any prior revision of these (2) For service information identified in ADDRESSES: You may send comments, SBs. this AD, contact Learjet Inc., One Learjet using the procedures found in 14 CFR (8) Installation date and SB revision level Way, Wichita, KS, 67209; phone: (316) 946– 11.43 and 11.45, by any of the following used for installation of the fuel control 2000; email: [email protected]; methods: screws within the engine fuel control in website: https:// • Federal eRulemaking Portal: Go to accordance with Honeywell SB TFE731–73– businessaircraft.bombardier.com/en/aircraft/ https://www.regulations.gov. Follow the 5146 Learjet.html. You may view this referenced instructions for submitting comments. (9) Any failures of fuel control screws after service information at the FAA, • Fax: 202–493–2251. compliance with Honeywell SB TFE731–73– Airworthiness Products Section, Operational • Mail: U.S. Department of 5146. Safety Branch, 901 Locust, Kansas City, MO 64106. For information on the availability of Transportation, Docket Operations, (h) Replacement this material at the FAA, call (816) 329–4148. M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Within 12 months after the effective date Issued on August 5, 2021. of this AD or 750 hours time-in-service after Avenue SE, Washington, DC 20590. the effective date of this AD, whichever Lance T. Gant, • Hand Delivery: Deliver to Mail occurs first, replace the engine fuel flow Director, Compliance & Airworthiness address above between 9 a.m. and 5 meter bracket in accordance with the Division, Aircraft Certification Service. p.m., Monday through Friday, except Accomplishment Instructions, paragraphs [FR Doc. 2021–17044 Filed 8–12–21; 8:45 am] Federal holidays. 3.A through 3.C, of the following Bombardier BILLING CODE 4910–13–P For EASA material that will be SB applicable to your airplane model. incorporated by reference (IBR) in this (1) Bombardier Learjet 40 SB 40–73–01, AD, contact EASA, Konrad-Adenauer- Revision 1, dated January 9, 2017. DEPARTMENT OF TRANSPORTATION Ufer 3, 50668 Cologne, Germany; (2) Bombardier Learjet 45 SB 45–73–2 telephone +49 221 8999 000; email Revision 1, dated January 9, 2017. Federal Aviation Administration (3) Bombardier Learjet 70 SB 70–73–01 [email protected]; internet www.easa.europa.eu. You may find this Revision 1, dated January 9, 2017. 14 CFR Part 39 (4) Bombardier Learjet 75 SB 75–73–01, IBR material on the EASA website at Revision 2, dated January 9, 2017. [Docket No. FAA–2021–0663; Project https://ad.easa.europa.eu. For Identifier MCAI–2020–01618–T] service information identified in this (i) Credit for Previous Actions proposed AD, contact Airbus SAS, RIN 2120–AA64 (1) This paragraph provides credit for the Airworthiness Office—EIAS, Rond- actions required by paragraph (h) of this AD, Airworthiness Directives; Airbus SAS Point Emile Dewoitine No: 2, 31700 if those actions were performed before the Blagnac Cedex, France; telephone +33 5 effective date of this AD using Bombardier Airplanes 61 93 36 96; fax +33 5 61 93 44 51; email Learjet 40 SB 40–73–01, Basic Issue, AGENCY: Federal Aviation Bombardier Learjet 45 Service Bulletin SB [email protected]; 45–73–2, Basic Issue, Bombardier Learjet 70 Administration (FAA), DOT. internet https://www.airbus.com. You SB 70–73–01, Basic Issue, or Bombardier ACTION: Notice of proposed rulemaking may view this IBR material at the FAA, Learjet 75 SB 75–73–01, Basic Issue, all dated (NPRM). Airworthiness Products Section, October 3, 2016, or Bombardier Learjet 75 SB Operational Safety Branch, 2200 South 75–73–01, Revision 1, dated October 10, SUMMARY: The FAA proposes to 216th St., Des Moines, WA. For 2016. supersede Airworthiness Directive (AD) information on the availability of this (2) To take credit for any previous action, 2016–17–12, which applies to all Airbus material at the FAA, call 206–231–3195. you must comply with paragraph (g) of this SAS Model A318 series airplanes; It is also available in the AD docket on AD within 60 days after the effective date of Model A319–111, –112, –113, –114, the internet at https:// this AD. –115, –131, –132, and –133 airplanes; www.regulations.gov by searching for (j) Alternative Methods of Compliance Model A320–211, –212, –214, –231, and locating Docket No. FAA–2021– (AMOCs) –232, and –233 airplanes; and Model 0663. For the UTC Aerospace Systems (1) The Manager, Wichita ACO Branch, A321–111, –112, –131, –211, –212, material identified in this proposed AD FAA, has the authority to approve AMOCs –213, –231, and –232 airplanes. AD that will not be incorporated by for this AD, if requested using the procedures 2016–17–12 requires inspecting certain reference, contact Collins Aerospace, found in 14 CFR 39.19. In accordance with trimmable horizontal stabilizer actuators Product Support Department 13, 14 CFR 39.19, send your request to your (THSAs) to determine the number of Avenue de L’Eguillette—Saint-Ouen principal inspector or local Flight Standards total flight cycles the THSA has L’Aumone, Boite Postale 7186 95056 District Office, as appropriate. If sending accumulated, and replacing the THSA if information directly to the manager of the Cergy Pontoise Cedex, France; necessary. Since the FAA issued AD telephone 1–877–808–7575; email crc@ certification office, send it to the attention of 2016–17–12, the FAA has determined the person identified in Related Information. collins.com; internet https:// (2) Before using any approved AMOC, that new or more restrictive www.collinsaerospace.com/support. airworthiness limitations are necessary. notify your appropriate principal inspector, Examining the AD Docket or lacking a principal inspector, the manager This proposed AD would require of the local flight standards district office/ revising the existing maintenance or You may examine the AD docket on certificate holding district office. inspection program, as applicable, to the internet at https://

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