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DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14

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## \QII~IiD at- ,!'R./',( ~,~ Ainvorthiness Directives; McDonnell Douglas Corporation Model rvID-90-30 Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTlON: Notice ofproposed rulemaking (NPRM). SUMMARY: We propose to adopt a new airworthiness directive (AD) for all ModeJ III /3 /0 

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20590. instructions for submitting comments. MD-90-30 airplanes. This proposed AD would require repetitive inspections for cracking ofthe left and right upper center skin panels ofthe horizontal stabilizer and corrective action ifnecessary. This proposed AD was prompted bycracking damage to an

### MD-8D right horizontal stabilizer upper center skin panel at the aft inboard comer. We are proposing this AD to detect and correct such cracking damage, which could result in loss ofthe overall structural integrity ofthe horizontal stabilizrr. DATES: We must receive comments on this proposedAIj) by (fNSERT DATE 45 DAYS AFTER DATE OF PUBLICATION INTHE FedJral Register). ADDRESSES: You may send comments by any ofthe following methods:

•Fa" 202-493-2251. • Federal cRulcmaking Portal: Go to httpJ/www.regulations.lwv. Follow the

• Mail: U.S. Department ofTransportation, Docket Operations, ]\11-30,West Building Ground Floor. Room W12-140, 1200 New Jersey Avenue SE., Washington, DC

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### • Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the ADDRESSES: You may send comments by any ofthe following methods: DATES: We must receive comments onthis proposed AD by [INSERT DATE 45 DAYS AFTER DATE OF PUBLICATION INTHE Federal Register]. MD-90-30 airplanes. This proposed AD would require repetitive inspections for cracki ofthe leftand right upper center skin panels ofthe horizontal stabilizer and corrective action ifnecessary. This proposed AD was prompted by cracking damage to anMD-8 right horizontal stabilizer upper center skin panel atthe aft inboard corner. We are proposing this AD todetect and correct such cracking damage, which could result in I ofthe overall structural integrity ofthe horizontal stabilizer. [491O-I3-P]
(Docket No. FAA-2010-++++j Directorate Identifier 2010-NM-167-AD

instructions forsubmitting comments. •Fax: 202-493-2251. Ainvorthiness Directivesj McDonnell Douglas Corporation Model MD-90-30 Airplm AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). SUMMARY: Wepropose to adopt anew airworthiness directjve (AD) for all Model 14CFR Part 39 Federal Aviation Administration DEPARTMENT OF TRANSPORT AnON

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•Mail: U.S. Department ofTransportation, Docket Operations, M-30, West Building Ground Floor, Room WI2-140, 1200New Jersey Avenue SE., Washington, C 

### ~----- 20590.AO~TlNG OTh'BO' tloL 14910-I3-P] DEPARTMENT OFTRANSPORTA nON Federal Aviation Administration 14CFR Part 39 [Docket No. FAA-2010-++++; Directorate Identifier 20~O-NM-167-AD RIN 2120-AA64 AirwOlthiness Directiyes; McDonnell Douglas Corporation Model MD-90-JO Airplanes AGENCY; Federal AViation Administration (FAA), DOll. ACTION; Notice ofproposed rulemaking (NPRM). SUMMARY: We propose to adopt anew airworthiness directive (AD) for all Model MD-90-30 airplanes. This proposed AD would require repetitive inspections for cracking ofthe left and right upper center skin panels ofthe horizontal stabilizer and corrective action ifnecessary. This proposed AD was prompted by cracking damage to an MD-80 , right horizontal stabilizer upper center skin panel al the aft inboard comer. \Ve are proposing this AD to delect and correct sllch cracking damage, which could result in loss ofthe overall structural integrity ofthe horizontal stabilizJr. ] 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 ofthe following methods: •Federal eRulcmaking Portal: Go to http://\\'\v\v.reglllations.12ov. Follow the instructions for submitting comments. •Fax: 202-493-2251 • Mail' U.S. Department ofTransportation, Docket Operations, M~30, West Building Ground Floor, Room W12-140, 1200 New Jersey AvenueSE., Washington, DC 20590. 

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