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Federal Register / Vol. 86, No. 42 / Friday, March 5, 2021 / Rules and Regulations
material at the FAA, call 2062313195.
It is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0133.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210133; 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 final rule, any comments received, and other information. The street address for the Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Courtney Kronenberger, Aerospace Engineer, Cabin Safety and Environmental Systems Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 2062313986; email:
Courtney.A.Kronenberger@faa.gov.
SUPPLEMENTARY INFORMATION:

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Background The FAA has received a report of a water supply line that detached above an EE cooling filter, leading to water intrusion into the forward EE bay, 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
line replaceable units 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 left-hand sidewall at station STA 571. The amount and duration of the water spillage are unknown. The cooling filter became saturated with the water, which was then blown via the EE
cooling system into multiple EE LRUs located in the EE bay.
Water that has been ingested or has entered into the EE cooling system via the cooling filter can be circulated to multiple EE racks and can accumulate on the LRUs, particularly where forced air cooling occurs. Water ingress to these LRUs can affect multiple EE bay racks and LRUs, resulting in loss of functionality or inaccurate output of critical electrical systems and possible loss of control of the airplane. The FAA
is issuing this AD to address the unsafe condition on these products.

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Model 777F series airplanes line numbers L/Ns 960 and subsequent have a joint at this location from the factory-installed CRES tube assembly.
Boeing released Service Bulletin 777
380042 as an economic service bulletin providing operators with airplanes prior to L/N 960 instructions to retrofit to this configuration at their discretion.
Therefore, this AD will require deactivation of the potable water system for all 777F with this joint installed either in production or through performance of Boeing SB 777380042.
FAAs Determination The FAA is issuing this AD because the agency has 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 Boeing MOM
MOM21008901B, dated February 26, 2021. This service information specifies procedures for deactivating the potable water system. 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.
AD Requirements This AD requires accomplishing the actions specified in the service information already described, except as discussed under Differences Between this AD and the Service Information.
This AD also prohibits the future accomplishment of the actions specified in Boeing Service Bulletin 77738
0042.
Difference Between This AD and the Service Information Boeing MOMMOM21008901B, dated February 26, 2021, specifies one Safety Action and six Recommended Actions. Although the FAA
recommends accomplishment of all of these actions, this AD requires only deactivation of the potable water system, as specified in the Safety Action of the service information.
Interim Action The FAA considers this AD to be an interim action. The manufacturer is currently developing a modification that will address the unsafe condition identified in this AD. Once this modification is developed, approved, and available, the FAA might consider additional rulemaking.

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Justification for Immediate Adoption and Determination of the Effective Date Section 553b3B of the Administrative Procedure Act APA 5
U.S.C. 551 et seq. authorizes agencies to dispense with notice and comment procedures for rules when the agency, for good cause, finds that those procedures are impracticable, unnecessary, or contrary to the public interest. Under this section, an agency, upon finding good cause, may issue a final rule without providing notice and seeking comment prior to issuance.
Further, section 553d of the APA
authorizes agencies to make rules effective in less than thirty days, upon a finding of good cause.
An unsafe condition exists that requires the immediate adoption of this AD without providing an opportunity for public comments prior to adoption.
The FAA has found that the risk to the flying public justifies forgoing notice and comment prior to adoption of this rule because water that has entered the EE cooling system via the cooling filter can affect multiple EE bay racks and LRUs, resulting in loss of functionality or inaccurate output of critical electrical systems and possible loss of control of the airplane. Accordingly, notice and opportunity for prior public comment are impracticable and contrary to the public interest pursuant to 5 U.S.C.
553b3B.
In addition, the FAA finds that good cause exists pursuant to 5 U.S.C. 553d for making this amendment effective in less than 30 days, for the same reasons the FAA found good cause to forgo notice and comment.
Comments Invited The FAA invites you to send any written data, views, or arguments about this final rule. Send your comments to an address listed under ADDRESSES.
Include Docket No. FAA20210133
and Project Identifier AD2021
00234T at the beginning of your comments. The most helpful comments reference a specific portion of the final rule, 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 final rule 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
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