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Airworthiness Directives; McDonnell Douglas Corporation Model MD-90-30 Airplane

AGENCY: Federal Aviation Administration (FAA), Department ofTransportation I()

RIN 2120-AA64

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[Docket No. FAA-2010-++++; Directorate Identifier 2010-NM-082-AD]

14 CFR Part 39

DEPARTMENT OF TRANSPORT ATlON

Federal Aviation Administration

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(DOT).

ACTION: Notice of proposed rnlemaking (NPRM).

SUMMARY: The FAA proposes to supersede an existing airworthiness directive (AD)

that applies to certain Model MD·90-30 airplanes. The existing AD, currently requires

modifying the auxiliary hydraulic power system (including doing all applicable related

investigative and corrective actions). This proposed AD would require these same

actions, using the corrected service information. This proposed AD results from fuel

system reviews conducted by the manufacturer, as well as reports of electrically shorted

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wires in the right wheel well and evidence of arcing on the auxiliary hydraulic pump

power cables, which are routed within the tire burst area. We are proposing this AD to

prevent electrically shorted wires or arcing at the auxiliary hydraulic pump power cables, INI'rtALS'SIG

which could result in a fire in the wheel well. We are also proposing this AD to reduce

the potential of an ignition source adj acent to the fuel tanks, which, in combination with

flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the

airplane.

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

DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].

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

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

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(4910-I3-P)

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-++++; Directorate Identifier 2010-NM-082-ADI

R1N 2120-AA64

Airworthiness Directives; McDonnell Douglas Corporation Model MD-90-30 Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of Transportation

(DOT).

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: The FAA proposes to supersede an existing airworthiness directive (AD)

that applies to certain Model MD-90-30 airplanes. The existing AD currently requires

modifying the auxiliary hydraulic power system (including doing all applicable related

investigative and corrective actions). This proposed AD would require these same

actions, using the corrected service information. This proposed AD results from fuel

system reviews conducted by the manufacturer, as weU as reports of electrically shorted

wires in the right wheel well and evidence of arcing on the auxiliary hydraulic pump

power cables, which are routed within the tire burst area. We are proposing this AD to

prevent electrically shorted wires or arcing at the auxiliary hydraulic pump power cables,

which could result in a fire in the wheel welL We are also proposing this AD to reduce

the porential of an ignition source adjacent to the fuel tanks, which, in combination with

flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the

airplane.

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

DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].

ADDRESSES: You may send comments by any of the follo\o\'ing methods:

• Federal eRulemaking Portal: Go to http://www.regulations.2ov. Follow the

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FAA Form 1360-14.1 (6-89) OFFICIAL FILE COPY