14910-13-P]

IO-NM-035-AD}

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IDocket No. FAA-10IO-++++j Directorate Identifier 2

Ainvortbiness Directives; The Boeing Company Model 747-400 and 747-400D Series

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RIN 2120-AA64

Federal Aviation Administration

DEPARTMENT OF TRANSPORT AnON

14 CFR Part 39

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main equipment centerl(MEC); and adding a reinfOrCig fiberglass overcoat to the top

surface of the MEC drip shield, including an inspecti~n for cracking and holes in the

MEC drip shield, and corrective actions if necessary. 15proposed AD also provides

an option to install an MEC drip shield drain system, wlich, if accomplished, would

extend the comPlianceltime for adding the reinforcini fiferglass overcoat to the top

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surface of the MEC drip shield. This proposed AD resulls from a report indicating that n

operator experienced a multi-power system loss in-fliJ of#1, #2, and #3 alternating

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current (AC) electrical power systems located in the MC, We are proposing this AD t

prevent water penetra~ion into the MEC, which cOUIJri.ult in the loss of flight critical '":="'''

systems.

DATES: We must receive comments on this proposed AD by [INSERT DATE 45 UT!l"GSYMOOl

DAYS AFTER DATJ OF PUBLICATION IN THE rJDERAL REGISTER].

Airplanes

AGENCY: Federal Aviation Administration (FAA), DO

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: We proPlose to adopt a new airworthineks ~irective (AD) for certain Mod;5'1 /0

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747-400 and 747-400D series airplanes. This proposed would require installing • _ b

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aluminum gutter reinforcing brackets to the forward and aft drip shield gutters of the
(4910-I3-P)

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

IDoeke! No. FAA-2010-++++; Directorate Identifier 2010-NM-035-AD)

RlN 2120-.'1..'1.64 31HO

OUTING SYMllO<.

ROUTING SYMBOl

Airplanes

Ainvorthiness Directives; The Boeing Company Model 747-400 and 747-4000 Series

AGENCY: Federal Aviation Administration (FAA), DOT

ACTION: Notice of proposed rulemaking (NPRM). I

SUMMARY: We propose to adopt a new airworthiness lirective (AD) for certain Mod

747-400 and 747-400D series airplanes. This proposed ,AD would require installing

aluminum gutter reinforcing brackets to the forward and J1ft drip shield gutters of the

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main equipment center (MEC); and adding a reinforcing fiberglass overcoat to tbe top Nfl1..llSISIG

surface of the MEC drip shield, including an inspection fJr cracking and holes in the A~G~

MEC drip shield, and corrective actions ifnecessary. The optional installation ofa MEC A ~

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drip shield drain system would extend the compliance til. e for adding the reinforcing

fiberglass overcoat to th top s,urface of the MEC drip Jhield. This proposed AD results

from a rep0l1 of an opertor experiencing a mUlti-POWe~s stem loss in-flight of#], 2,

and 3 alternating currenJ (AC) electrical power systemJ 1 cated in the MEC. We are I I NlT\AlS/SIG

proposing this AD to prevent water penetration into the MEC, which could result in the

loss of flight critical systems.

DATES: We mllst receive comments on this proposed AID by [INSERT DATE 45

DAYS AFTER DATE OF PUBLICATION IN THE F~Dr.Rt-L REGISTER].

ADDRESSES: You may send comments by any of the following methods:

• Federal eRulemaking Portal: Go to http://www.lgulations.gov. Follow the

'"

instructions for submitting comments.

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DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration ONClJRRE"CES

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14 CFR Part 39

("Docket No. FAA-10lO-++++; Directorate Identificii 2 lO-NM-035-AD}

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EC, which could result IIIthe

AGENCY: Federal Aviation Administration (FAA), 001.

ACTION: Notice of prJposed rulemaking (NPRlv1).

SUMMARY: We propJse to adopt a new airworthiness 1irective (AD) for certain Mod

747-400 and 747-400D leri~sairplanes. This proposed Ab would require installing

aluminum gutter reinfOr~ing brackets to the fOf\vard anCilft drip shield":gut~ers ofthe

main equipment center 1MEC); and addmg a reinforcl+ fberglaSS overcoat to tbe top

surface of the :MEC drip' shield, including an mspection [.,r cracking and holes in the ATE

MEC drip shield, and cdrrective actions if necessary ~e optIOnal installation of a MEC

I

drip shield drain system would extend the compliance ~i e for adding the reinforcing

I

fiberglass overcoat to the top surface of the MEC drip Shiild. This proposed AD results

ITom a report of an operltor experiencing a mOlti-powJr rstem loss in-flight of # I, 2,

and 3 alternating curren~ (AC) electrical power systemJ I cated in the MEC. We are

, h' AD I ' , th I proposmg t IS to prevent water penetratIOn mto e

loss of flIght cntlcal syslems.

DATES: We must recei~e comments on this proposed 11by [INSERT DATE 45

DAYS AFTER DATE OF PUBLICATION IN THE FEJ~RAL REGISTER].

ADDRESSES: You mal send comments by any ofthJ follo:ing methods

• Federal eRule~aking Portal. Go to htt ://wwt.Je ulations. ov Follow the

, '" b I InstructIOns lor su mlttmg comments.