Federal Register / Vol. 86, No. 12 / Thursday, January 21, 2021 / Proposed Rules 6271 

leading edge outboard blowout door. The 

FAA is issuing this AD to address the 

missing sealant, which is intended to act as 

a fuel barrier. In the presence of a substantial 

fuel leak from the wing box, the unintended 

drain path could allow fuel to come into 

contact with the engine. This condition, if 

not addressed, could lead to a large 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 Alert 

Requirements Bulletin 737–57A1350 RB, 

dated April 23, 2020, do all applicable 

actions identified in, and in accordance with, 

the Accomplishment Instructions of Boeing 

Alert Requirements Bulletin 737–57A1350 

RB, dated April 23, 2020. 

Note 1 to paragraph (g): Guidance for 

accomplishing the actions required by this 

AD can be found in Boeing Alert Service 

Bulletin 737–57A1350, dated April 23, 2020, 

which is referred to in Boeing Alert 

Requirements Bulletin 737–57A1350 RB, 

dated April 23, 2020. 

(h) Exception to Service Information 

Specifications 

Where Boeing Alert Requirements Bulletin 

737–57A1350 RB, dated April 23, 2020, 

refers to ‘‘the Original Issue date of 

Requirements Bulletin 737–57A1350 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 December 17, 2020. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–01160 Filed 1–19–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2020–1174; Project 

Identifier MCAI–2019–00135–E] 

RIN 2120–AA64 

Airworthiness Directives; Rolls-Royce 

Deutschland Ltd & Co KG (Type 

Certificate Previously Held by RollsRoyce 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 (RRD) BR700–710A1–10, BR700– 

710A2–20 and BR700–710C4–11 model 

turbofan engines. This proposed AD was 

prompted by an investigation by RRD, 

which revealed a quality escape during 

the high-pressure turbine (HPT) stage 1 

disk rim cooling air hole manufacturing 

process. This proposed AD would 

require removing affected HPT disks 

from service prior to reaching specified 

compliance times or at the next engine 

shop visit, whichever occurs first. 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 March 8, 2021. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

https://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: (202) 493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, 

M–30, West Building Ground Floor, 

Room W12–140, 1200 New Jersey 

Avenue SE, Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this NPRM, contact Rolls-Royce 

Deutschland Ltd & Co KG, Eschenweg 

11, Dahlewitz 15827, Germany; phone: 

+49 0 33 7086 1200; email: 

rrd.techhelp@rolls-royce.com. 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–2020–1174; 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–2020–1174; Project Identifier 

MCAI–2019–00135–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 


jbell on DSKJLSW7X2PROD with PROPOSALS
6272 Federal Register / Vol. 86, No. 12 / Thursday, January 21, 2021 / Proposed Rules 

11.35, the FAA will post all comments 

received, without change, to https://

www.regulations.gov, including any 

personal information you provide. The 

agency will also post a report 

summarizing each substantive verbal 

contact received about this 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 NPRM 

contain commercial or financial 

information that is customarily treated 

as private, that you actually treat as 

private, and that is relevant or 

responsive to this NPRM, it is important 

that you clearly designate the submitted 

comments as CBI. Please mark each 

page of your submission containing CBI 

as ‘‘PROPIN.’’ The FAA will treat such 

marked submissions as confidential 

under the FOIA, and they will not be 

placed in the public docket of this 

NPRM. Submissions containing CBI 

should be sent to 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 2019–0299, dated December 10, 

2019 (referred to after this as ‘‘the 

MCAI’’), to address the unsafe condition 

on these products. The MCAI states: 

An occurrence was reported of an HPT 

stage 1 disc burst on an industrial gas turbine 

engine. Subsequent investigation revealed a 

quality escape during HPT stage 1 disc rim 

cooling air hole manufacturing process. A 

review revealed that 28 HPT stage 1 discs 

were subject to a similar quality escape, two 

of which have been recovered and removed 

from service. The consequence of this 

manufacturing error is that the affected parts 

can no longer safely reach their Declared Safe 

Cyclic Life (DSCL). 

This condition, if not corrected, may lead 

to failure of an affected part, 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 remove the 

engine from service for in-shop replacement 

of the affected part. 

For the reasons described above, this 

[EASA] AD reduces the DSCL for the affected 

parts, requires identification of the affected 

parts and removal from service of each 

affected engine for replacement of the 

affected part. This [EASA] AD also prohibits 

(re)installation of affected parts. 

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–2020–1174. 

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 issuing 

this NPRM 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 NonModification Service Bulletin (NMSB) 

SB–BR700–72–A900659, Revision 1, 

dated November 5, 2019 (the NMSB). 

The NMSB provides the part numbers 

and serial numbers for affected HPT 

disks, the serial numbers for all engines 

with an affected HPT disk installed, and 

instructions for replacement of the 

affected HPT disk. 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. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

replacement of the affected HPT disk 

before reaching specified compliance 

times or at the next engine shop visit, 

whichever occurs first. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 21 

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 

Replace HPT disk .................. 20 work-hours × $85 per hour = $1,700 ................................ $550,000 $551,700 $11,585,700 

The FAA has included all known 

costs in its cost estimate. According to 

the manufacturer, however, all of the 

costs of this proposed AD may be 

covered under warranty, thereby 

reducing the cost impact on affected 

operators. 

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 


jbell on DSKJLSW7X2PROD with PROPOSALS
Federal Register / Vol. 86, No. 12 / Thursday, January 21, 2021 / Proposed Rules 6273 

(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 RollsRoyce Deutschland GmbH, formerly 

BMW Rolls-Royce GmbH): Docket No. 

FAA–2020–1174; Project Identifier 

MCAI–2019–00135–E. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by March 8, 

2021. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Rolls-Royce 

Deutschland Ltd & Co KG (RRD) (Type 

Certificate previously held by Rolls-Royce 

Deutschland GmbH, formerly BMW RollsRoyce GmbH) BR700–710A1–10, BR700– 

710A2–20 and BR700–710C4–11 model 

turbofan engines with a high-pressure turbine 

(HPT) stage 1 disk having a part number and 

serial number listed in Planning Information, 

paragraph 1.A., of RRD Alert NonModification Service Bulletin (NMSB) SB– 

BR700–72–A900659, Revision 1, dated 

November 5, 2019, installed. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7230, Turbine Engine Compressor 

Section. 

(e) Unsafe Condition 

This AD was prompted by an investigation 

by RRD, which revealed a quality escape 

during the HPT stage 1 disk rim cooling air 

hole manufacturing process. The FAA is 

issuing this AD to prevent failure of the HPT 

stage 1 disk. The unsafe condition, if not 

addressed, could result in the release of highenergy debris, damage to the airplane, and 

reduced control of the airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

Before the affected HPT stage 1 disk 

exceeds 2,840 flight cycles (FCs) since new, 

or within 60 days after the effective date of 

this AD, whichever occurs later, but not to 

exceed 8 years after the effective date of this 

AD if using FCs, remove the affected HPT 

stage 1 disk from service and replace with a 

part eligible for installation. Guidance on 

replacing the HPT stage 1 disk can be found 

in the Accomplishment Instructions, 

paragraph 3.B., of RRD Non-Modification 

Service Bulletin (NMSB) SB–BR700–72– 

A900659, Revision 1, dated November 5, 

2019. 

(h) Installation Prohibition 

After the effective date of this AD, do not 

install any affected HPT stage 1 disk onto any 

engine. 

(i) Definition 

(1) For the purpose of this AD, a ‘‘part 

eligible for installation’’ is an HPT stage 1 

disk that is not listed in paragraph 1.A. of 

RRD NMSB SB–BR700–72–A900659, 

Revision 1, dated November 5, 2019. 

(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 2019–0299, dated 

December 10, 2019, 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–2020–1174. 

(3) For service information identified in 

this AD, contact Rolls-Royce Deutschland Ltd 

& Co KG, Eschenweg 11, Dahlewitz, 15827, 

Germany; phone: +49 0 33 7086 1200; email: 

rrd.techhelp@rolls-royce.com. 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 January 8, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–00672 Filed 1–19–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2020–1140; Project 

Identifier AD–2020–01009–T] 

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 

supersede Airworthiness Directive (AD) 

2017–14–13, which applies to certain 

The Boeing Company Model 737–600, 

–700, –700C, –800, –900, and –900ER 

series airplanes. AD 2017–14–13 

requires a torque check of the screws in 

the cover assembly of the heel rest for 

both the captain’s and the first officer’s 

rudder pedals, and corrective action if 

necessary. Since the FAA issued AD 

2017–14–13, operators have continued 

to find loose rudder pedal cover 

fasteners on previously inspected 

airplanes and airplanes outside the 

applicability of AD 2017–14–13. This 

proposed AD would require modifying 

the rudder pedal cover and shroud, and 

apply to all The Boeing Company Model 

737–600, –700, –700C, –800, –900, and 

–900ER series airplanes and Model 737– 

8 and 737–9 airplanes. 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 March 8, 2021. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

https://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: 202–493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, 

M–30, West Building Ground Floor, 

Room W12–140, 1200 New Jersey 

Avenue SE, Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 


jbell on DSKJLSW7X2PROD with PROPOSALS