require repetitive high frequency eddy current inspections for cracking of the aft face 0

the hinge bearing lugs of the aft face of the horizontal stabilizer center section left and

14 CFR Part 39

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[4910-13-

SUMJ\1ARY: We propose to adopt a new airworthiness directive (AD) for all

McDonnell Douglas Corporation Model MD-90-30 airplanes. This proposed AD waul

RIN 2120-AA64

ACTION: Notice nfproposed rulernaking (NPRM).

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

Federal Aviation Administration

AGENCY: Federal Aviation Administration (FAA), DOT.

OQ'53

{Docket No. FAA-2010-++++; Directorate Identifier 2010-NM-OIO-AD]

DEPARTMENT OF TRANSPORTATION

right ribs, and related investigative and corrective actions if necessary. This proposed

results from reports of cracks found on either the left, right, (or in one case both sides)

the center section ribs of the horizontal stabilizer. We are proposing this AD to detect

correct cracking in the hinge bearing lugs of the center section oftbe left and right ribs,

which could result in failure of the hinge bearing lugs and consequent inability of the

horizontal stabilizer to sustain the required loads.

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

DAYS AFTER DATE OF PUBLICA nON 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

instructions for submitting comments .

• Fax: 202-493-2251.

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

.1J.S.GPO;l ~ 1M.(I12f20101
1491O-13-Pj

DEPARTMENT OF TRANSPORT AnON

Federal .o\"iation Administration

14 CFR Part 39

IDocket No. FAA-20IO-++++; Directorate Identifier 2010-NM-OIO-ADI

RIN 2120-AA64

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

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new airworthiness directive (AD) for all

McDonnell Douglas Corporation Model MD-90-30 airplanes. This proposed AD would

require repetitive high frequency eddy current inspections for cracking of the aft face of

the hinge bearing lugs of the aft face afthe horizontal stabilizer center section left and

right ribs, and related investigative and corrective actions if necessary. This proposed AD

results from repons of cracks found on either the left, right, (or in one case both sides) of

the center section ribs of the horizontal stabilizer. We are proposing this AD to detect and

correct cracking in the hinge bearing lugs of lhc cenler section of the left and right ribs,

which could result in failure of the hinge bearing lugs and consequent inability of the

horizontal stabilizer to sustain the required loads.

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

DA YS AFTER DATE OF PUBLICA nON IN THE FEDERAL REGfSTER].

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

• Federal eRulcmaking Portal: Go to http://www.regulations.£ov. Follow the

instructions for submitting comments .

• Fax: 202-493-2251.

,

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