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AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). Airplanes [491Q-13-P[

SUMMARY: Wepropose to adopt anew ainvorthiness directive (AD) fortheproduct listed above. This proposed AD would require installing new in-line fuses forthe fuel n; level float switch and new in-line fuses forthe pressure switch, as applicable, and lITC'«; 'MBO 

### RlN 2120-AA64 

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### Airworthiness Directives; McDonnell Douglas Corporation Model DC-9-14, DC-9-15i

# r 3 and DC-9-15F Airplanes; andDC-9-20, DC-9-30, DC-9-40, andDC-9-50 Series "'''~" DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 <1



## U)~5\) [Docket No. FAA-2010-++++; Directorate Identifier 2010-NM-188-AD]

changing thewiring. Theproposed actions would affectthe left andright wing forward I .oas1G 

### spars, center wing forward spar, forward auxiliary fueltank, andaft auxiliary fuel tank, E I 

### applicable. This proposed AD was prompted by fuel system reviews conducted bythe jOllTlN(;SYMDOl 

### manufacturer. We areproposing this AD toprevent the potential ofignition sources (ITI~IG 

### inside fuel tanks, which, incombination with flanunable fuel vapors, could result infn I Alf 

### tank explosions and consequent loss ofthe airplane. DATES: Wemust receive comments onthis proposed ADby [INSERT DATE 4S DAYS AFTER DATE OFPUBLICAnON INTHE Federal Register). n 

### ADDRESSES: You may send comments by any ofthe following methods:

•Federal eRulemaking Portal: Go tohttp://www.regulations.gov. Follow the instructions forsubmitting comments .

•Fax: 202-493-2251.

### 14910-13-PI

DEPARTMENT OF TRANSPORT AnON Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA-2010-++++; Directorate Identifier 2010-NM-188-ADl RlN 2120-AA64 Ainvorthiness Directives; McDonnell Douglas Corporation Model DC-9-14, DC-9-1 S, and DC-9-15F Airplanes; and DC-9-20, DC-9-30. DC-9-40, and DC-9-50 Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulcmaking (NPRM). SUMMARY: We propose to adopt anew ainvonruness directive (AD) for the products listed above. This proposed AD would require installing new in-line fuses forthe fuel level float switch and new in-line fuses for the pressure switch, as applicable, and changing the wiring. The proposed actions would affect the left and right wing forward spars, center wing forward spar, forward auxiliary fuel tank, and aft auxiliary fuel tank, as applicable. This proposed AD was prompted by fuel system reviews conducted by the manufacturer. We are proposing this AD to prevent the potential of ignition sources inside fnel tanks, which, in combination with flammable fuel vapors, could result infuel tank explosions and consequent loss ofthe airplane. DATES: We must receive comments on this proposed AD by [INSERT DATE 45 DAYS "AFTERDATE OF PUBLICATION IN THE Federal Register). ADDRESSES: You may send comments by any oflhe following methods:

• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments .

• Fax: 202-493-2251. ~C<.m""ro, Wf~I""'VRE 

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FAA Form 1360·14.1 (6-89} OFFICIAl FILE COPY