(4910-13-P1

14 CFR Port 39 DEPARTMENT OF TRANSPPRTA nON Federal Aviation Administration I 

# ff6q IDocket No. FAA-2010-++++j Directorate [dcntifier 2010-NM-006-AD) RJN 2120-AA64 Airworthiness Directives; The Boeing Company Model 747-400 and -4000 Series Airplanes ONCURRf-N"f.S ROL'rrNG 'YMlIOL {.(~ \>,,'11, 

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AGENCY: Federal Aviation Adnlluistration (FAA), DOT. i-fNNf- {61 I 1"'~T'AlSiSIG/-J ACTION: Noliee ofproposed ru1emaking (NPRM). 

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## ! SUMMARY: We propose to adopt anew airv..'orthinessdirective (AD) forcertain Mod I 1,/(2.'1Iv "OUTING SYM""L

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# '/r~hr~~: ~~lE inspection to deternline the routing ofthe wire bundles in the number two and nW11ber 747-400 and -4000 series airplanes. This proposed AD would require ageneral visual three enhrlne pylons near the leading edge, and related investigative and C01Tective I ROUT! 0 WM~,,1. actions, ifnecessary. For certain,airplanes, this proposed AD would also require certain I IKITIAl~""(; concurrent actions. This proposep AD results from areport ofafuel leak from the drainl I line ofthe number tv.'oengine pylon. We areproposing this AD to detect and concct I chafing ofthe main fuel feed tube andthe alternating current motor-driven hydraulic 1I'ITIAl.$.'SIG pump wire bundle, which could leadto arcing from the exposed wire to the fuel feed I>XII\ tube, and could result inafire or:explosion. DATES: We must receive comments on this proposed AD by [INSERT DATE 45 I DAYS AFTER DATE OF PUBLICA nON IN THE FEDERAL REGlSTER]. ADDRESSES: You may send clmments by any ofthe following methods: , I • Federal eRulemaking Portal: Go to http://w~''w.regulatiot1s.gov. Follow the ~OUTING ,YMBOL [NLTLAI.5ISIG DAT[
"OUTING SYM"OL Instructions for submitting COl1llnents.
• Fax. 202-493-2251. !>A1I!149JO-I3-PJ

DEPARTMENT OF TRANSPQRTATION Federal Aviation Administration _OtlCVRR~tlC~S O\1T1NG SY"'801. 14CFR ParI 39 IDocket No. FAA-2010-++++; Directorate Identifier 201O-NM-006-ADI RJN 2J20-AA64 Ainvorthiness Directives; The Boeing Company Model 747-400 and -400D Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). 

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## fl1'JM--l405 INlTlALS/SIG ~ 

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# "'.., It,1,0 SUMMARY: We propose to adopt anew airworthiness directive (AD) for certain Mod

orexplosion. 747-400 and 

### -4000 series airplanes. This proposed AD would require doing an OArE inspection ofwire bundles for

### diage (chafing) inthe number two and number three ouhng 5Y"'OQI

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# SOl-A engIne PY ons near t e ea mg e~ge, an omg re ale Investigative corrective actIOns, I INITIA.lSlSIG number two engine pylon. We areproposing this AD to detect and correct chafing ofthe 

## ki A.t4:.0..1.- £.. OUTING sYKIlOl. main fuel feedtube and the alternating current motor-dnven;fwnp wire bundle, which could lead to arcing from the exposed wire to the fuel feed tube, and could result in afir'

# ',0/3ho necessary. This proposed AD results from areport ofa fuel leak from the drain line ofth

OUTING sY"5Ol. DATES: We must receive comments on this proposed AD by [INSERT DATE 45 NTTlALS/SIG DAYS AFTER DATE OF PUBLICATION INTHE FEDERAL REGISTER]. ADDRESSES: You may send comments byany ofthe following methods: ovrmG SYMBOl • Federal eRulemaking Rortal: 00 to http://www.regulatlons.Q.ov. Follow the

• • C b' 

# I instructIOns lor su mlltmg comments
• Fax: 202-493-2251.