Federal Register / Vol. 87, No. 58 / Friday, March 25, 2022 / Proposed Rules 17035 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2022–0156; Project 

Identifier AD–2021–01474–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) 

AD 2021–06–03, which applies to all 

The Boeing Company Model 777F series 

airplanes. AD 2021–06–03 requires 

deactivating the potable water system. 

Since the FAA issued AD 2021–06–03, 

Boeing developed new actions to 

address the unsafe condition, which 

terminate the action required by AD 

2021–06–03. This proposed AD would 

retain the actions required by AD 2021– 

06–03 and would require installing a 

shroud to the water supply line in the 

forward cargo compartment, and 

performing a leak test of the potable 

water system. For certain airplanes, this 

proposed AD would also require 

replacing tubes and hoses from the 

water supply line and installing a 

shroud to the water return line. The 

FAA is proposing this AD to address the 

unsafe condition on these products. 

DATES: The FAA must receive comments 

on this proposed AD by May 9, 2022. 

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 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 at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2022–0156. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2022–0156; 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. 

FOR FURTHER INFORMATION CONTACT: 

Courtney Tuck, Aerospace Engineer, 

Cabin Safety and Environmental 

Systems Section, FAA, Seattle ACO 

Branch, 2200 South 216th St., Des 

Moines, WA 98198; phone and fax: 206– 

231–3986; email: Courtney.K.Tuck@

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–2022–0156; Project Identifier AD– 

2021–01474–T’’ 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 the proposal 

because of those comments. 

Except for Confidential Business 

Information (CBI) as described in the 

following paragraph, and other 

information as described in 14 CFR 

11.35, the FAA will post all comments 

received, without change, to https://

www.regulations.gov, including any 

personal information you provide. The 

agency will also post a report 

summarizing each substantive verbal 

contact received about this proposed 

AD. 

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 Courtney Tuck, 

Aerospace Engineer, Cabin Safety and 

Environmental Systems Section, FAA, 

Seattle ACO Branch, 2200 South 216th 

St., Des Moines, WA 98198; phone and 

fax: 206–231–3986; email: 

Courtney.K.Tuck@faa.gov. 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 FAA issued AD 2021–06–03, 

Amendment 39–21469 (86 FR 12809, 

March 5, 2021) (AD 2021–06–03), for all 

The Boeing Company Model 777F series 

airplanes. AD 2021–06–03 was 

prompted by a report of a water supply 

line that detached above an electronic 

equipment (EE) cooling filter, leading to 

water intrusion into the forward EE bay. 

AD 2021–06–03 requires deactivating 

the potable water system. The agency 

issued AD 2021–06–03 to address water 

entering the EE cooling system via the 

cooling filter, which can affect multiple 

EE bay racks and line replaceable units 

(LRUs), resulting in loss of functionality 

or inaccurate output of critical electrical 

systems and possible loss of control of 

the airplane. 

The reported water supply 

detachment occurred on a Model 777F 

series airplane with 34,000 total flight 

hours and 6,000 total flight cycles. 

During potable water servicing on 

ground, the operator received multiple 

messages appearing on the engine 

indication and crew alert system 

(EICAS) indicating multiple affected EE 

LRUs. Further investigation revealed 

that the location of a joint on a swaged 

end fitting ferrule of a corrosion 

resistant stainless steel (CRES) water 

supply line had become partially or 

fully detached from the tube, causing 

water to spill onto an EE cooling filter 

(directly below the fitting) in the lefthand sidewall at station (STA) 571. The 

amount and duration of the water 

spillage are unknown. Water saturated 

the cooling filter, which was then blown 

via the EE cooling system into multiple 

EE LRUs located in the EE bay. 

Model 777F series airplanes line 

numbers (L/Ns) 960 and subsequent 


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17036 Federal Register / Vol. 87, No. 58 / Friday, March 25, 2022 / Proposed Rules 

have a joint at this location from the 

factory-installed CRES tube assembly. 

Boeing released Service Bulletin 777– 

38–0042 as an economic service bulletin 

providing operators with airplanes prior 

to L/N 960 instructions to retrofit to this 

configuration at their discretion. 

Therefore, AD 2021–06–03 requires 

deactivation of the potable water system 

for all 777F airplanes with this joint 

installed either in production or through 

accomplishment of Boeing SB 777–38– 

0042. 

Actions Since AD 2021–06–03 Was 

Issued 

Since the FAA issued AD 2021–06– 

03, the FAA has determined that further 

rulemaking is necessary. The preamble 

to AD 2021–06–03 specifies that the 

FAA considers the requirements 

‘‘interim action’’ and that the 

manufacturer is developing a 

modification to address the unsafe 

condition. That AD explains that the 

FAA might consider further rulemaking 

if a modification is developed, 

approved, and available. The 

manufacturer now has developed such a 

modification, and this proposed AD 

follows from that determination. 

FAA’s Determination 

The FAA is issuing this NPRM after 

determining that the unsafe condition 

described previously is likely to exist or 

develop on other products of the same 

type design. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Boeing Alert 

Requirements Bulletin 777–38A0048 

RB, dated October 18, 2021. This service 

information specifies procedures for 

replacing tubes and hoses from the 

water supply line and installing a 

shroud to the water supply and return 

lines in the forward cargo compartment 

and performing a leak test of the potable 

water system. 

This proposed AD would also require 

Boeing Multi Operator Message MOM– 

MOM–21–0089–01B, dated February 26, 

2021, which the Director of the Federal 

Register approved for incorporation by 

reference as of March 5, 2021 (86 FR 

12809, March 5, 2021). 

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 retain all of 

the requirements of AD 2021–06–03. 

This proposed AD would also require 

accomplishment of the actions 

identified in Boeing Alert Requirements 

Bulletin 777–38A0048 RB, dated 

October 18, 2021, 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. This proposed AD would also 

prohibit the future accomplishment of 

the actions specified in Boeing Service 

Bulletin 777–38–0042. 

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–2022– 

0156. 

Difference Between This AD and the 

Service Information 

Boeing Multi Operator Message 

MOM–MOM–21–0089–01B, dated 

February 26, 2021, specifies one Safety 

Action and six Recommended Actions. 

Although the FAA recommends 

accomplishment of all of these actions, 

this proposed AD would require only 

deactivation of the potable water 

system, as specified in the Safety Action 

of the service information. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 58 

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 

Deactivation of potable water system (retained actions from AD 2021–06–03).2 work-hours × $85 per hour = $170 ...... $0 ....................... $170 ................... $9,860. 

Replace tubes and hoses, and install 

shroud (new proposed action).

Up to 12 work-hours × $85 per hour = 

Up to $1,020.

Up to $1,850 ...... Up to $2,870 ...... Up to $166,460. 

Potable water system leak test (new proposed action).2 work-hours × $85 per hour = $170 ...... $0 ....................... $170 ................... $9,860. 

The FAA has included all known 

costs in its cost estimate. According to 

the manufacturer, however, some or 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 has 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 that the proposed regulation: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Would not affect intrastate 

aviation in Alaska, and 

(3) Would not have a significant 

economic impact, positive or negative, 

on a substantial number of small entities 

under the criteria of the Regulatory 

Flexibility Act. 


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Federal Register / Vol. 87, No. 58 / Friday, March 25, 2022 / Proposed Rules 17037 

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: 

■ a. Removing Airworthiness Directive 

(AD) 2021–06–03, Amendment 39– 

21469 (86 FR 12809, March 5, 2021), 

and 

■ b. Adding the following new AD: 

The Boeing Company: Docket No. FAA– 

2022–0156; Project Identifier AD–2021– 

01474–T. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) action by May 9, 

2022. 

(b) Affected ADs 

This AD replaces AD 2021–06–03, 

Amendment 39–21469 (86 FR 12809, March 

5, 2021) (AD 2021–06–03). 

(c) Applicability 

This AD applies to all The Boeing 

Company Model 777F series airplanes, 

certificated in any category. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 38, Water/waste. 

(e) Unsafe Condition 

This AD was prompted by a report of a 

water supply line that detached at a certain 

joint located above an electronic equipment 

(EE) cooling filter, leading to water intrusion 

into the forward EE bay. This AD was also 

prompted by the development of new actions 

to address the unsafe condition. The FAA is 

issuing this AD to address water entering the 

EE cooling system via the cooling filter, 

which can affect multiple EE bay racks and 

line replaceable units (LRUs), resulting in 

loss of functionality or inaccurate output of 

critical electrical systems and possible loss of 

control of the airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Retained Deactivation of Potable Water 

System, With No Changes 

This paragraph restates the requirements of 

paragraph (g) of AD 2021–06–03, with no 

changes. For the airplanes identified in 

paragraphs (g)(1) and (2) of this AD: Within 

5 days after March 5, 2021 (the effective date 

of AD 2021–06–03), deactivate the potable 

water system, in accordance with Boeing 

Multi Operator Message MOM–MOM–21– 

0089–01B, dated February 26, 2021 (Boeing 

MOM–MOM–21–0089–01B). 

(1) Line numbers (L/Ns) 959 and earlier on 

which the actions specified in Boeing Service 

Bulletin 777–38–0042 have been 

accomplished. 

(2) L/Ns 960 and subsequent. 

Note 1 to paragraph (g): Guidance on 

deactivating the potable water system can be 

found in Boeing 777 Aircraft Maintenance 

Manual (AMM) Task 38–10–00–040–801. 

(h) Retained Installation Prohibition, With 

No Changes 

This paragraph restates the requirements of 

paragraph (h) of AD 2021–06–03, with no 

changes. For airplanes not identified in 

paragraph (g) of this AD: As of March 5, 2021 

(the effective date of AD 2021–06–03), 

accomplishment of the actions specified in 

Boeing Service Bulletin 777–38–0042 is 

prohibited. 

(i) Retained Reporting Provisions, With No 

Changes 

This paragraph restates the requirements of 

paragraph (i) of AD 2021–06–03, with no 

changes. Although Boeing MOM–MOM–21– 

0089–01B specifies to report inspection 

findings, this AD does not require any report. 

(j) New Required Actions 

Except as specified by paragraph (k) of this 

AD: At the applicable times specified in the 

‘‘Compliance’’ paragraph of Boeing Alert 

Requirements Bulletin 777–38A0048 RB, 

dated October 18, 2021, do all applicable 

actions identified in, and in accordance with, 

the Accomplishment Instructions of Boeing 

Alert Requirements Bulletin 777–38A0048 

RB, dated October 18, 2021. 

Note 1 to paragraph (j): Guidance for 

accomplishing the actions required by this 

AD can be found in Boeing Alert Service 

Bulletin 777–38A0048, dated October 18, 

2021, which is referred to in Boeing Alert 

Requirements Bulletin 777–38A0048 RB, 

dated October 18, 2021. 

(k) Exceptions to Service Information 

Specifications 

Where the Compliance Time columns of 

the tables in the ‘‘Compliance’’ paragraph of 

Boeing Alert Requirements Bulletin 777– 

38A0048 RB, dated October 18, 2021, use the 

phrase ‘‘the Original Issue date of 

Requirements Bulletin 777–38A0048 RB,’’ 

this AD requires using ‘‘the effective date of 

this AD.’’ 

(l) Terminating Action for Deactivation of 

Potable Water System 

Accomplishment of the required actions 

specified in the Accomplishment 

Instructions of Boeing Alert Requirements 

Bulletin 777–38A0048 RB, dated October 18, 

2021, terminates the potable water system 

deactivation required by paragraph (g) of this 

AD. 

(m) 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 (n)(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. 

(n) Related Information 

(1) For more information about this AD, 

contact Courtney Tuck, Aerospace Engineer, 

Cabin Safety and Environmental Systems 

Section, FAA, Seattle ACO Branch, 2200 

South 216th St., Des Moines, WA 98198; 

phone and fax: 206–231–3986; email: 

Courtney.K.Tuck@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 March 7, 2022. 

Derek Morgan, 

Acting Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2022–06315 Filed 3–24–22; 8:45 am] 

BILLING CODE 4910–13–P 


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