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# -1 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 

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# 312- (Docket No. FAA-2~-++++; Directoratc Identifier 2010-NM-220-ADj RlN 2120-AA64 Ainvorthiness Directives; The Boeing Company Model 777-200, -200LR. -300, and -30GER Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed mlemaking (NPRM).

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### SUMMARY: We propose to adopt anew airworthiness directive (AD) fortheproduct 

## A;~hf2.l;IrY\"\ ,m listed above. This proposed AD would require installing foreign object debris (FOD) \ \0

## III rubber shields over theprimary and secondary external power connectors for certain airplanes, and wrapping fire-resistant silicone tape around thehydraulic tube forcertai other airplanes. This proposed AD was prompted by areport ofafire inthe main equipment center due to failure ofanexternal power connector, which caused high-temperature arcing and subsequent splatter ofmolten copper on an adjacent UllNGSYMBOL

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### hydraulic tube, creating ahole inthe tube and spraying hydraulic fluid into the power ,,'I'~ 

### connector, resulting ina fire. Inaddition there were several reports ofoverheating or OU'I'ING5YMHOL 

### arcing ofexternal power connectors, and one report ofafire due to arcing caused by NmAI.$I!iI<;; 

### FOD. We are proposing this AD to prevent FOD from entering the primary and secondary external power connectors, which could result inoverheating or arcing and "<;;SyMBOl. 

### consequent fire inthe main equipment center. ,.mAl.S/Sl<;; 

### DATES: We must receive comments on this proposed AD by [INSERT DATE 45 ATE 

### DAYS AFTER DATE OF PUBLICATION INTHE FEDERAL REGISTER]. ADDRESSES: You may send comments byany ofthe following methods:[4910-13-PI DEPARTMENT OF nUNS PORTATI ON Federal Aviation Administration 14 eFR Part 39 (Docket No. FAA-2011-++++; Directorate Identifier 2010-NM-220-ADI RIN 2120-.'1..'1.64 Airworthiness Directive~; The Boeing Company Model 777-200, -200LR, -300, and -300ER Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). SUMMARY: We propose to adopt anew ainvorthiness directive (AD) for the product listed above. This proposed AD would require installing foreign object debris (FOD) mbber shields over the primary and secondary external power COlmectors for certain I 0..ceTlo.l.., atl:planes, and wrapping fire-resistant silicone tape around ~hydraulic tube for all 

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- airplanes. This proposed AD was prompted byareport ofa fire in the main equipment :<JtKU""""C[-S oun"G 5''''1<)'

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center due to failure of an 'extemal power connector, which caused high-temperature 

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## . ~~ hole in the tube and spraying hydraulic fluid into the power connector, resulting in a fir

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# I I f I' 'f I ·wn"CSl'''"Ol n a ltlon t ere were severa reports a oveneatlng or arclllg a extema power connectors, and one report of a fire due to arcing caused by FOD. \Ve are proposing thi l",n~I.~rSIG AD to prevent FOD from entering the primary and secondary external PQwerconnec[f 

## ~tTE .\-\.>..Q (),.>,4"~'I(~~~ which could result inoverheating or arcing and consequent fire

# ll..r ce~'ft:f"" C-<fTl"" "~OOt DATES: We must receive conunents on this proposed AD by [INSERT DATE 45 , DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods:

•Federal eRulemakjng Portal: Go to http://www.refmlations.eov. Follow the , instructions for submitting c-omments. '''lllALS}SlC 

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k,,",----DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 

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..This proposed AD \vas prompted by areport of a fire in the main equipment /:2

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### 7-10 14CFR Part 39 IDocket No. FAA-2011-++++; Directorate Identifier 201O-NM-220-AD] RIN 2120-AA64 Airworthiness Directives; The Boeing Company Model 777-200, -200LR, -300, and -300ER Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulcmaking (NPRM). SUMMARY: We propose to adopt a llew ainvonhincss directive (AD) for the product listed above. This proposed AD would require installing foreign object debris (FOD) rubber shields over the primary and secondary external power connectors for certain <a..ce-do.i"'\ airplanes, and wrapping rire-resistant silicone tapc around ~hydraulic tube for all

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center due to failure of an exlernal power connector, which caused high-temperature 

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~ ... i;;j~·':i<;I,. arclllg and subsequent splaner of'molten copper on an adjacent hydrauhc tube, crcatmg -I hole inthe lUbe and spraying hydraulic Jluid into the power connectof, resulting ina fir :." In addition there were several reports ofoverheating or arcing of cxleml11power connectors, nnd one report ofa fire due to arcIngcaused by FOD. We arc proposing thi ~,l""'- 

## .wto prevent FOD from enlering the primary and secondary external pQwcrconnectQr ",." ~~Il 00''' ~lt.~Il.~ •••••• 1;)J. which could result inoverheating orarcing andconsequent firein~ r;;eR~~:F."
. -"".,,,,
...,,"&<>1. DATES: We must receive comments on this proposed AD by [INSERT DATE 45 DAYS AFTER DATE OF PUBLICATION INTHE FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthc following methods:

•Federal eRulcmaking Portal: Go to http://www_ree.ulations.eov. Follow the instructions forsubmitling comments. 

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