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DATES: We must receive comments on this proposed AD by [INSERT DATE 45 DAYS AFTER DATE OF PUBLICATION INTHE Federal Register]. DC-9-8! (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87) and MDADDRESSES: You may send comments by any ofthe follo"ving methods: • Federal eRulemaking Portal: Go to http://www.lgulatiOlls.gOv. Follow the 

# I Ainvorthiness Directives; McDonnell Douglas Corporation Model DC-9-81 (MD~81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and MD-88 Aicplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). SUl\'[MARY: We propose to adopt anew airworthiness directive (AD) for all Model 88 airplanes. This proposed AD would require repetitive inspections forcracking of horizontal stabilizer left and right upper center skin panell, and corrective action if necessary. This proposed AD was prompted by cracking damage to the right horizontal stabilizer upper center skin panel at !.heaft inboard comer. We are proposing this AD to detect and correct slIch cracking damage, which could result in loss ofthe overall structural integrity ofthe horizontal stabilizer.

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DAYS AFTER DATE OF PUBLICATION INTHE Federal Register). DC-9-82 (MD-82), DC-9-83 (MO-83), DC-9-8? (MD-8?), and MO-88 Airplanes Ainvorthiness Directives; McDonnell Douglas Corporation Model DC~9-81 (MD-81 RIN lJ20-AA64

DC-9-8l (MO-8l), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-8? (MD-8?) and MO DEPARTMENT OF TRAl'lSPORT AT10N 14CFR Part 39 Federal Aviation Administration [Docket No. FAA-10IO-++++; Directorate Identifier lOIO-NM-I68-AD [491O-13-P]

SUMMARY: Wepropose to adopt anew airworthiness directive (AD) for all Model

structural integrity ofthe horizontal stabilizer.

instructions for submitting comments. 

### DATES: Wcmllst receive comments onthis proposed AD by [INSERT DATE 45 88airplanes. This proposed AD would require repetitive inspections for cracking of horizontal stabilizer left and right upper center skin panels, and corrective action if necessary. This proposed AD was prompted by cracking damage tothe right horizoota stabilizer upper center skin panel atthe aftinboard corner. We areproposing this AD t 

### detect and correct such cracking damage, whichlcould result inloss ofthe overall


### ADDRESSES: YOllmay send comments by any ofthe following methods: •Federal eRulemaking Portal: Gotohttp://www.regulations.gov. Follow the14910-13-P]

DEPARTMENT OF TRANSPORTATION Fc.dcral Aviation Administration 14 CFR Part 39 10- , :f-IV 

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DATES: We must receive comments on this proposed AD by [INSERT DATE 45 DAYS AFTER DATE OF PUBLICATION IN THE Fedbral Reg;ster], 88 airplanes. This proposed AD would require repetitive inspections for cracking of horizontal stabilizer left and right upper center skin panels, and corrective action if DC-9-81 (MD-8!), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87) and MD- (Docket No. FAA-10lO-++++; Directorate Identifier 20tO-NM-168-AD DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and MD-88 A;rplanes Ainvorthincss Directives; McDonnell Douglas Corporation Model DC-9-81 (MD·8l), AGENCY: Federal Aviation Administration (FAA.), DOT. ACTION: Notice ofproposed rulemaking (NPRM). SUMMARY: We propose to adopt anew airworthiness directive (AD) for all Model
necessary. This proposed AD was prompted by cracking damage to the right horizontal stabilizer upper center skin panel atthe 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 stabilizer. ADDRESSES: You may send comments by any ofthe following methods: •Federal eRulemaking Portal: Go to http://ww,,,1QUlations.gOv. Follow the instructions for submitting comments . • Fax: 202-493-2251.

FAAForm 1360-14.1 (6-89) OFFICIAL FILE COPY