Airworthiness Directives; The Boeing Company Airplanes, 36352-36355 [2020-12869]

Download as PDF 36352 Federal Register / Vol. 85, No. 116 / Tuesday, June 16, 2020 / Proposed Rules Novel or Unusual Design Features The Bombardier Model CL–600–2B19 airplane will incorporate the following novel or unusual design features: A therapeutic oxygen system for medical use. As a part of the executive interior installation, the gaseous passenger oxygen system will be outfitted with a therapeutic oxygen system. The therapeutic oxygen system shares the same supply of oxygen with the existing passenger oxygen system and consists of multiple constant flow oxygen outlets located throughout the cabin. The flightcrew can turn the therapeutic oxygen system on and off from the flightdeck to allow use at any point during the flight, and to preserve a sufficient remaining oxygen reserve, in the event therapeutic oxygen is used for medical purposes, to accommodate the passengers in the event of an emergency oxygen situation. lotter on DSK30NT082PROD with PROPOSALS Discussion No specific regulations address the design and installation of required passenger oxygen systems that share a supply source with an optional oxygen system used specifically for therapeutic applications. Therapeutic oxygen systems have been previously certified, and were generally considered an extension of the passenger oxygen system for the purpose of defining the applicable regulations. As a result, existing requirements, such as §§ 25.1309, 25.1441(b) and (c), 25.1451, and 25.1453, in the Bombardier Model CL–600–2B19 airplanes’ certification basis applicable to this STC project, provide some design standards appropriate for oxygen system installations. In addition, § 25.1445 includes standards for oxygen distribution systems when oxygen is supplied to flightcrew and passengers. If a common source of supply is used, § 25.1445(a)(2) requires a means to separately reserve the minimum supply required by the flightcrew. Section 25.1445 is intended to protect the flightcrew by ensuring that an adequate supply of oxygen is available to complete a descent and landing following a loss of cabin pressure. When the regulation was written, the only passenger oxygen system designs were supplemental oxygen systems intended to protect passengers from hypoxia in the event of a decompression. Existing passenger oxygen systems did not include design features that would allow the flightcrew to control oxygen to passengers during flight. There are no similar requirements in § 25.1445 when oxygen is supplied from the same VerDate Sep<11>2014 17:29 Jun 15, 2020 Jkt 250001 source to passengers for use during a decompression, and for discretionary or first-aid use any time during the flight. In the proposed design, the passenger and therapeutic oxygen systems use the same source of oxygen. The special conditions contain additional design requirements for the equipment involved in this dual therapeutic oxygen plus gaseous oxygen installation. Furthermore, the potential hazard that can exist when the oxygen content of an enclosed area becomes too high because of system leaks, malfunction, or damage from external sources, make it necessary to ensure that adequate safety standards are applied to the design and installation of the oxygen system in Bombardier Model CL–600–2B19 airplanes. These potential hazards also necessitate development and application of appropriate additional design and installation standards. The proposed special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards. Applicability As discussed above, these special conditions are applicable to the Bombardier Model CL–600–2B19 airplane as modified by Aerospace Design and Compliance. Should Aerospace Design and Compliance apply at a later date for a supplemental type certificate to modify any other model included on Type Certificate No. A21EA, to incorporate the same novel or unusual design feature, these special conditions would apply to that model as well. Certification of the Bombardier Model CL–600–2B19 airplane is currently scheduled for May 2020. The substance of these special conditions has been subject to the notice and public comment procedure in several prior instances with no public comments received. Therefore, because a delay would significantly affect the applicant’s installation of the system and the certification of the airplane, the FAA is shortening the public comment period to 20 days. Conclusion This action affects only a certain novel or unusual design feature on one model of airplane. It is not a rule of general applicability and affects only the applicant who applied to the FAA for approval of these features on the airplane. PO 00000 Frm 00002 Fmt 4702 Sfmt 4702 List of Subjects in 14 CFR Part 25 Aircraft, Aviation safety, Reporting and recordkeeping requirements. Authority Citation The authority citation for these special conditions is as follows: Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701, 44702, 44704. The Proposed Special Conditions Accordingly, the Federal Aviation Administration (FAA) proposes the following special conditions as part of the type certification basis for Bombardier Model CL–600–2B19 airplanes, as modified by Aerospace Design and Compliance, LLC. The distribution system for the passenger therapeutic oxygen systems must be designed and installed to meet requirements as follows: 1. When oxygen is supplied to passengers for both supplemental and therapeutic purposes, the distribution system must be designed for either— a. A source of supplemental oxygen for protection following a loss of cabin pressure, and a separate source for therapeutic purposes: or b. A common source of supply with means to separately reserve the minimum supply required by the passengers for supplemental use following a loss of cabin pressure. Issued in Des Moines, Washington, on May 21, 2020. James E. Wilborn, Acting Manager, Transport Standards Branch, Policy and Innovation Division, Aircraft Certification Service. [FR Doc. 2020–11437 Filed 6–15–20; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2020–0465; Product Identifier 2020–NM–074–AD] RIN 2120–AA64 Airworthiness Directives; The Boeing Company Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: The FAA proposes to adopt a new airworthiness directive (AD) for The Boeing Company Model 787–8, 787–9, and 787–10 airplanes powered by Rolls Royce Trent 1000 engines. This proposed AD was prompted by reports SUMMARY: E:\FR\FM\16JNP1.SGM 16JNP1 Federal Register / Vol. 85, No. 116 / Tuesday, June 16, 2020 / Proposed Rules of damage to the inner fixed structure (IFS) forward upper fire seal and damage to thermal insulation blankets in the forward upper area of the thrust reverser (TR). This proposed AD would require repetitive inspections of the IFS forward upper fire seal and thermal insulation blankets in the forward upper area of the TR for damage and applicable on-condition actions. 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 31, 2020. 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 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. It is also available on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA–2020–0465. lotter on DSK30NT082PROD with PROPOSALS 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– 0465; 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: Tak Kobayashi, Aerospace Engineer, Propulsion Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des VerDate Sep<11>2014 17:29 Jun 15, 2020 Jkt 250001 Moines, WA; phone: 206–231–3553; email: Takahisa.Kobayashi@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 the ADDRESSES section. Include ‘‘Docket No. FAA–2020–0465; Product Identifier 2020–NM–074–AD’’ at the beginning of your comments. The FAA specifically invites comments on the overall regulatory, economic, environmental, and energy aspects of this NPRM. The FAA will consider all comments received by the closing date and may amend this NPRM because of those comments. 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 proposed AD. Discussion The FAA has received reports of damage to the IFS forward upper fire seal and damage to thermal insulation blankets in the forward upper area of the TR. Investigation revealed that structural gapping could occur at the interface between the leading edge of the IFS and the engine splitter structure during flight. This gapping condition exposes the IFS forward upper fire seal to excessive airflow pressure and also allows airflow to pass between the engine splitter structure and the IFS forward upper fire seal, resulting in damage to the IFS forward upper fire seal and thermal blanket. Failure of the IFS forward upper fire seal could cause the loss of seal pressurization and degrade the ability to detect and extinguish an engine fire, resulting in an uncontrolled fire. Damage to the TR insulation blanket could result in thermal damage to the TR inner wall, the subsequent release of engine exhaust components, and consequent damage to critical areas of the airplane. Relationship Between This Proposed AD and AD 2018–15–03 This proposed AD does not supersede or terminate any requirement of AD 2018–15–03, Amendment 39–19335 (83 FR 34753, July 23, 2018) (‘‘AD 2018–15– 03’’). AD 2018–15–03 requires an inspection to determine the part number of the IFS forward upper fire seals, and applicable on-condition actions. The oncondition actions include replacement of any IFS forward upper fire seal PO 00000 Frm 00003 Fmt 4702 Sfmt 4702 36353 having part number (P/N) 725Z3171– 127 or P/N 725Z3171–128 with a fire seal having P/N 725Z3171–151 or P/N 725Z3171–152, as applicable. After any IFS forward upper fire seal replacement, AD 2018–15–03 requires updating the part number of the thrust reverser half (two thrust reverser halves per engine). AD 2018–15–03 also prohibits the installation of IFS forward upper fire seals having P/N 725Z3171–127 or P/N 725Z3171–128, as of August 27, 2018 (the effective date of AD 2018–15–03). This proposed AD would require repetitive inspections of the IFS forward upper fire seal and thermal insulation blankets in the forward upper area of the TR for damage, and applicable oncondition actions. During the inspections specified in this proposed AD, if damage is found on any IFS forward upper fire seal, and that fire seal has P/N 725Z3171–127 or P/N 725Z3171–128, that damaged fire seal must be replaced with a fire seal having P/N 725Z3171–151 or P/N 725Z3171– 152, as applicable. After the IFS forward upper fire seal replacement, operators may update the part number of the thrust reverser half to get credit for compliance with the requirements of AD 2018–15–03, provided that action is accomplished within the compliance time of AD 2018–15–03, which is 36 months after August 27, 2018 (the effective date of AD 2018–15–03). Related Service Information Under 1 CFR Part 51 The FAA reviewed Boeing Alert Requirements Bulletin B787–81205– SB780041–00 RB, Issue 001, dated March 31, 2020. The service information describes procedures for repetitive inspections of the IFS forward upper fire seal and thermal insulation blankets of the TR for damage and applicable oncondition actions. Damage to a forward upper fire seal includes cuts, splits, nicks, punctures, and missing sections. Damage to an upper thermal blanket includes tears, cuts, missing metal skin, missing insulation, and overtemperature conditions shown by discoloration or scorching. The oncondition actions include replacing any damaged forward upper fire seal with a new fire seal having an appropriate part number, and replacing any damaged forward upper thermal blanket with a new thermal blanket. 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 the ADDRESSES section. E:\FR\FM\16JNP1.SGM 16JNP1 36354 Federal Register / Vol. 85, No. 116 / Tuesday, June 16, 2020 / Proposed Rules Directive Implementation Aviation Rulemaking Committee (AD ARC), to enhance the AD system. One enhancement is a process for annotating which steps in the service information are ‘‘required for compliance’’ (RC) with an AD. Boeing has implemented this RC concept into Boeing service bulletins. In an effort to further improve the quality of ADs and AD-related Boeing service information, a joint process improvement initiative was worked between the FAA and Boeing. The initiative resulted in the development of a new process in which the service information more clearly identifies the actions needed to address the unsafe condition in the ‘‘Accomplishment Instructions.’’ The new process results in a Boeing Requirements Bulletin, which contains only the actions needed to address the unsafe condition (i.e., only the RC actions). FAA’s Determination The FAA is proposing this AD because the agency evaluated all the relevant information and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design. Proposed AD Requirements This proposed AD would require accomplishment of the actions identified in Boeing Alert Requirements Bulletin B787–81205–SB780041–00 RB, Issue 001, dated March 31, 2020, described previously, except as discussed under ‘‘Differences Between this Proposed AD and the Service Information,’’ and except for any differences identified as exceptions in the regulatory text of this proposed AD. For information on the procedures and compliance times, see this service information at https:// www.regulations.gov by searching for and locating Docket No. FAA–2020– 0465. Differences Between This Proposed AD and the Service Information Boeing Alert Service Bulletin B787– 81205–SB780041–00, Issue 001, dated March 31, 2020, which is referred to in Boeing Alert Requirements Bulletin B787–81205–SB780041–00 RB, Issue Explanation of Requirements Bulletin The FAA worked in conjunction with industry, under the Airworthiness 001, dated March 31, 2020, specifies 0.5 task hours for replacing the fire seal and 0.5 task hours for replacing the thermal blanket. Boeing notified the FAA that these estimates are not accurate and the correct estimated task hours are 2 workhours per TR half for replacing the fire seal and 1 work-hour per TR half for replacing the thermal blanket. The Costs of Compliance section in this proposed AD reflects the corrected estimated costs. Interim Action The FAA considers this proposed AD interim action. If final action is later identified, the FAA might consider further rulemaking at that time. Costs of Compliance The FAA estimates that this proposed AD affects 14 airplanes of U.S. registry. The FAA estimates the following costs to comply with this proposed AD: ESTIMATED COSTS FOR REQUIRED ACTIONS Action Labor cost Parts cost Inspection ...................... 4 work-hours × $85 per hour = $340 per inspection cycle. $0 The FAA estimates the following costs to do any necessary on-condition Cost per product $340 per inspection cycle. actions that would be required. The FAA has no way of determining the Cost on U.S. operators $4,760 per inspection cycle number of aircraft that might need these on-condition actions: lotter on DSK30NT082PROD with PROPOSALS ESTIMATED COSTS OF ON-CONDITION ACTIONS Action Labor cost Parts cost Cost per product Fire seal replacement. Thermal blanket replacement. 2 work-hours × $85 per hour = $170 per TR half. 1 work-hour × $85 per hour = $85 per TR half. $1,365 per TR half ............................... $1,535 per TR half (4 TR halves per airplane) $17,940 per TR half (4 TR halves per airplane) According to the manufacturer, some or all of the costs of this proposed AD may be covered under warranty by Goodrich, thereby reducing the cost impact on affected operators. The FAA does not control warranty coverage for affected individuals. As a result, the FAA has included all known costs in our cost estimate. 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: VerDate Sep<11>2014 17:29 Jun 15, 2020 Jkt 250001 $17,855 per TR half ............................. 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 PO 00000 Frm 00004 Fmt 4702 Sfmt 4702 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: E:\FR\FM\16JNP1.SGM 16JNP1 Federal Register / Vol. 85, No. 116 / Tuesday, June 16, 2020 / Proposed Rules (1) Is not a ‘‘significant regulatory action’’ under Executive Order 12866, (2) Will not affect intrastate aviation in Alaska, and (3) Will 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 (AD): ■ The Boeing Company: Docket No. FAA– 2020–0465; Product Identifier 2020– NM–074–AD. (a) Comments Due Date The FAA must receive comments by July 31, 2020. (b) Affected ADs None. (c) Applicability This AD applies to The Boeing Company Model 787–8, 787–9, and 787–10 airplanes, certificated in any category, powered by Rolls Royce Trent 1000 engines. lotter on DSK30NT082PROD with PROPOSALS (d) Subject Air Transport Association (ATA) of America Code 78, Engine Exhaust System. (e) Unsafe Condition This AD was prompted by reports of damage to the inner fixed structure (IFS) forward upper fire seal and damage to thermal insulation blankets in the forward upper area of the thrust reverser (TR). The FAA is issuing this AD to address the damage to the IFS forward upper fire seal and the thermal insulation blankets of the TR due to airflow through structural gapping that could occur at the interface between the leading edge of the IFS and the engine splitter structure during flight. Failure of the IFS forward upper fire seal could cause the loss of seal pressurization and degrade the ability to detect and extinguish an engine fire, resulting in an uncontrolled fire. Damage to the TR insulation blanket could result in thermal damage to the TR inner wall, the subsequent release of engine exhaust VerDate Sep<11>2014 17:29 Jun 15, 2020 Jkt 250001 components, and consequent damage to critical areas of the airplane. (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 Alert Requirements Bulletin B787–81205– SB780041–00 RB, Issue 001, dated March 31, 2020, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin B787–81205–SB780041–00 RB, Issue 001, dated March 31, 2020. Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin B787–81205–SB780041–00, Issue 001, dated March 31, 2020, which is referred to in Boeing Alert Requirements Bulletin B787–81205–SB780041–00 RB, Issue 001, dated March 31, 2020. (h) Exceptions to Service Information Specifications Where Boeing Alert Requirements Bulletin B787–81205–SB780041–00 RB, Issue 001, dated March 31, 2020, uses the phrase ‘‘the Issue 001 date of Requirements Bulletin B787–81205–SB780041–00 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 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 paragraph (j)(1) of this AD. Information may be emailed to: 9ANM-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 local flight standards district office/ certificate holding district 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 Tak Kobayashi, Aerospace Engineer, Propulsion Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA; phone: 206–231–3553; email: Takahisa.Kobayashi@faa.gov. PO 00000 Frm 00005 Fmt 4702 Sfmt 4702 36355 (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 June 3, 2020. Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2020–12869 Filed 6–15–20; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 71 [Docket No. FAA–2020–0525; Airspace Docket No. 20–ASO–7] RIN 2120–AA66 Proposed Amendment and Establishment of Area Navigation (RNAV) Routes; South-Central Florida Metroplex Project Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: This action proposes to amend two existing low altitude RNAV routes (T-routes), and establish nine new T-routes in support of the SouthCentral Florida Metroplex Project. The proposed changes would reduce the dependency of the National Airspace System (NAS) on ground-based navigational systems, and assist with the transition to a more efficient Performance Based Navigation (PBN) route structure. DATES: Comments must be received on or before July 31, 2020. ADDRESSES: Send comments on this proposal to the U.S. Department of Transportation, Docket Operations, 1200 New Jersey Avenue SE, West Building Ground Floor, Room W12–140, Washington, DC 20590; telephone: 1 (800) 647–5527 or (202) 366–9826. You must identify FAA Docket No. FAA– 2020–0525; Airspace Docket No. 20– ASO–7 at the beginning of your comments. You may also submit comments through the internet at https://www.regulations.gov. FAA Order 7400.11D, Airspace Designations and Reporting Points, and SUMMARY: E:\FR\FM\16JNP1.SGM 16JNP1

Agencies

[Federal Register Volume 85, Number 116 (Tuesday, June 16, 2020)]
[Proposed Rules]
[Pages 36352-36355]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2020-12869]


-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2020-0465; Product Identifier 2020-NM-074-AD]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company 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 The Boeing Company Model 787-8, 787-9, and 787-10 airplanes powered 
by Rolls Royce Trent 1000 engines. This proposed AD was prompted by 
reports

[[Page 36353]]

of damage to the inner fixed structure (IFS) forward upper fire seal 
and damage to thermal insulation blankets in the forward upper area of 
the thrust reverser (TR). This proposed AD would require repetitive 
inspections of the IFS forward upper fire seal and thermal insulation 
blankets in the forward upper area of the TR for damage and applicable 
on-condition actions. 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 31, 
2020.

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 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. It is also available on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2020-
0465.

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-
0465; 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: Tak Kobayashi, Aerospace Engineer, 
Propulsion Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des 
Moines, WA; phone: 206-231-3553; email: [email protected].

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 the ADDRESSES section. Include ``Docket No. FAA-2020-0465; 
Product Identifier 2020-NM-074-AD'' at the beginning of your comments. 
The FAA specifically invites comments on the overall regulatory, 
economic, environmental, and energy aspects of this NPRM. The FAA will 
consider all comments received by the closing date and may amend this 
NPRM because of those comments.
    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 proposed AD.

Discussion

    The FAA has received reports of damage to the IFS forward upper 
fire seal and damage to thermal insulation blankets in the forward 
upper area of the TR. Investigation revealed that structural gapping 
could occur at the interface between the leading edge of the IFS and 
the engine splitter structure during flight. This gapping condition 
exposes the IFS forward upper fire seal to excessive airflow pressure 
and also allows airflow to pass between the engine splitter structure 
and the IFS forward upper fire seal, resulting in damage to the IFS 
forward upper fire seal and thermal blanket. Failure of the IFS forward 
upper fire seal could cause the loss of seal pressurization and degrade 
the ability to detect and extinguish an engine fire, resulting in an 
uncontrolled fire. Damage to the TR insulation blanket could result in 
thermal damage to the TR inner wall, the subsequent release of engine 
exhaust components, and consequent damage to critical areas of the 
airplane.

Relationship Between This Proposed AD and AD 2018-15-03

    This proposed AD does not supersede or terminate any requirement of 
AD 2018-15-03, Amendment 39-19335 (83 FR 34753, July 23, 2018) (``AD 
2018-15-03''). AD 2018-15-03 requires an inspection to determine the 
part number of the IFS forward upper fire seals, and applicable on-
condition actions. The on-condition actions include replacement of any 
IFS forward upper fire seal having part number (P/N) 725Z3171-127 or P/
N 725Z3171-128 with a fire seal having P/N 725Z3171-151 or P/N 
725Z3171-152, as applicable. After any IFS forward upper fire seal 
replacement, AD 2018-15-03 requires updating the part number of the 
thrust reverser half (two thrust reverser halves per engine). AD 2018-
15-03 also prohibits the installation of IFS forward upper fire seals 
having P/N 725Z3171-127 or P/N 725Z3171-128, as of August 27, 2018 (the 
effective date of AD 2018-15-03).
    This proposed AD would require repetitive inspections of the IFS 
forward upper fire seal and thermal insulation blankets in the forward 
upper area of the TR for damage, and applicable on-condition actions. 
During the inspections specified in this proposed AD, if damage is 
found on any IFS forward upper fire seal, and that fire seal has P/N 
725Z3171-127 or P/N 725Z3171-128, that damaged fire seal must be 
replaced with a fire seal having P/N 725Z3171-151 or P/N 725Z3171-152, 
as applicable. After the IFS forward upper fire seal replacement, 
operators may update the part number of the thrust reverser half to get 
credit for compliance with the requirements of AD 2018-15-03, provided 
that action is accomplished within the compliance time of AD 2018-15-
03, which is 36 months after August 27, 2018 (the effective date of AD 
2018-15-03).

Related Service Information Under 1 CFR Part 51

    The FAA reviewed Boeing Alert Requirements Bulletin B787-81205-
SB780041-00 RB, Issue 001, dated March 31, 2020. The service 
information describes procedures for repetitive inspections of the IFS 
forward upper fire seal and thermal insulation blankets of the TR for 
damage and applicable on-condition actions. Damage to a forward upper 
fire seal includes cuts, splits, nicks, punctures, and missing 
sections. Damage to an upper thermal blanket includes tears, cuts, 
missing metal skin, missing insulation, and over-temperature conditions 
shown by discoloration or scorching. The on-condition actions include 
replacing any damaged forward upper fire seal with a new fire seal 
having an appropriate part number, and replacing any damaged forward 
upper thermal blanket with a new thermal blanket.
    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 the ADDRESSES section.

[[Page 36354]]

FAA's Determination

    The FAA is proposing this AD because the agency evaluated all the 
relevant information and determined the unsafe condition described 
previously is likely to exist or develop in other products of the same 
type design.

Proposed AD Requirements

    This proposed AD would require accomplishment of the actions 
identified in Boeing Alert Requirements Bulletin B787-81205-SB780041-00 
RB, Issue 001, dated March 31, 2020, described previously, except as 
discussed under ``Differences Between this Proposed AD and the Service 
Information,'' and except for any differences identified as exceptions 
in the regulatory text of this proposed AD.
    For information on the procedures and compliance times, see this 
service information at https://www.regulations.gov by searching for and 
locating Docket No. FAA-2020-0465.

Explanation of Requirements Bulletin

    The FAA worked in conjunction with industry, under the 
Airworthiness Directive Implementation Aviation Rulemaking Committee 
(AD ARC), to enhance the AD system. One enhancement is a process for 
annotating which steps in the service information are ``required for 
compliance'' (RC) with an AD. Boeing has implemented this RC concept 
into Boeing service bulletins.
    In an effort to further improve the quality of ADs and AD-related 
Boeing service information, a joint process improvement initiative was 
worked between the FAA and Boeing. The initiative resulted in the 
development of a new process in which the service information more 
clearly identifies the actions needed to address the unsafe condition 
in the ``Accomplishment Instructions.'' The new process results in a 
Boeing Requirements Bulletin, which contains only the actions needed to 
address the unsafe condition (i.e., only the RC actions).

Differences Between This Proposed AD and the Service Information

    Boeing Alert Service Bulletin B787-81205-SB780041-00, Issue 001, 
dated March 31, 2020, which is referred to in Boeing Alert Requirements 
Bulletin B787-81205-SB780041-00 RB, Issue 001, dated March 31, 2020, 
specifies 0.5 task hours for replacing the fire seal and 0.5 task hours 
for replacing the thermal blanket. Boeing notified the FAA that these 
estimates are not accurate and the correct estimated task hours are 2 
work-hours per TR half for replacing the fire seal and 1 work-hour per 
TR half for replacing the thermal blanket. The Costs of Compliance 
section in this proposed AD reflects the corrected estimated costs.

Interim Action

    The FAA considers this proposed AD interim action. If final action 
is later identified, the FAA might consider further rulemaking at that 
time.

Costs of Compliance

    The FAA estimates that this proposed AD affects 14 airplanes of 
U.S. registry. The FAA estimates the following costs to comply with 
this proposed AD:

                                      Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
                                                                                                  Cost on U.S.
             Action                     Labor cost           Parts cost     Cost per product       operators
----------------------------------------------------------------------------------------------------------------
Inspection.....................  4 work-hours x $85 per               $0   $340 per            $4,760 per
                                  hour = $340 per                           inspection cycle.   inspection cycle
                                  inspection cycle.
----------------------------------------------------------------------------------------------------------------

    The FAA estimates the following costs to do any necessary on-
condition actions that would be required. The FAA has no way of 
determining the number of aircraft that might need these on-condition 
actions:

                                     Estimated Costs of On-Condition Actions
----------------------------------------------------------------------------------------------------------------
              Action                       Labor cost                Parts cost             Cost per product
----------------------------------------------------------------------------------------------------------------
Fire seal replacement............  2 work-hours x $85 per     $1,365 per TR half......  $1,535 per TR half (4 TR
                                    hour = $170 per TR half.                             halves per airplane)
Thermal blanket replacement......  1 work-hour x $85 per      $17,855 per TR half.....  $17,940 per TR half (4
                                    hour = $85 per TR half.                              TR halves per airplane)
----------------------------------------------------------------------------------------------------------------

    According to the manufacturer, some or all of the costs of this 
proposed AD may be covered under warranty by Goodrich, thereby reducing 
the cost impact on affected operators. The FAA does not control 
warranty coverage for affected individuals. As a result, the FAA has 
included all known costs in our cost estimate.

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:

[[Page 36355]]

    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Will not affect intrastate aviation in Alaska, and
    (3) Will 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

0
1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive (AD):

The Boeing Company: Docket No. FAA-2020-0465; Product Identifier 
2020-NM-074-AD.

(a) Comments Due Date

    The FAA must receive comments by July 31, 2020.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to The Boeing Company Model 787-8, 787-9, and 
787-10 airplanes, certificated in any category, powered by Rolls 
Royce Trent 1000 engines.

(d) Subject

    Air Transport Association (ATA) of America Code 78, Engine 
Exhaust System.

(e) Unsafe Condition

    This AD was prompted by reports of damage to the inner fixed 
structure (IFS) forward upper fire seal and damage to thermal 
insulation blankets in the forward upper area of the thrust reverser 
(TR). The FAA is issuing this AD to address the damage to the IFS 
forward upper fire seal and the thermal insulation blankets of the 
TR due to airflow through structural gapping that could occur at the 
interface between the leading edge of the IFS and the engine 
splitter structure during flight. Failure of the IFS forward upper 
fire seal could cause the loss of seal pressurization and degrade 
the ability to detect and extinguish an engine fire, resulting in an 
uncontrolled fire. Damage to the TR insulation blanket could result 
in thermal damage to the TR inner wall, the subsequent release of 
engine exhaust components, and consequent damage to critical areas 
of the airplane.

(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 
Alert Requirements Bulletin B787-81205-SB780041-00 RB, Issue 001, 
dated March 31, 2020, do all applicable actions identified in, and 
in accordance with, the Accomplishment Instructions of Boeing Alert 
Requirements Bulletin B787-81205-SB780041-00 RB, Issue 001, dated 
March 31, 2020.
    Note 1 to paragraph (g): Guidance for accomplishing the actions 
required by this AD can be found in Boeing Alert Service Bulletin 
B787-81205-SB780041-00, Issue 001, dated March 31, 2020, which is 
referred to in Boeing Alert Requirements Bulletin B787-81205-
SB780041-00 RB, Issue 001, dated March 31, 2020.

(h) Exceptions to Service Information Specifications

    Where Boeing Alert Requirements Bulletin B787-81205-SB780041-00 
RB, Issue 001, dated March 31, 2020, uses the phrase ``the Issue 001 
date of Requirements Bulletin B787-81205-SB780041-00 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 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 paragraph (j)(1) of this AD. Information may be 
emailed to: [email protected].
    (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.
    (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 Tak Kobayashi, 
Aerospace Engineer, Propulsion Section, FAA, Seattle ACO Branch, 
2200 South 216th St., Des Moines, WA; phone: 206-231-3553; email: 
[email protected].
    (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 June 3, 2020.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification 
Service.
[FR Doc. 2020-12869 Filed 6-15-20; 8:45 am]
BILLING CODE 4910-13-P