### 14CFR Part 39 (491O-13-PJ



### DEPARTMENT OF TRANSPORTATION Federal Aviation Administration



# /204 [Docket No. FAA-2010-++++j Directorate Identifier 2010-NM-147-AD] RIN 2120-AA64 Airworthiness Directives; Various Aviation Communication &Surveillance Systems (ACSS) Traffic Alert and Collision Avoidance System (TeAS) Units AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemak.ing (NPRM). SUMlVlARY: We propose to adopt anew airworthiness directive (AD) forvarious airc-raftequipped with certain ACSS TeAS units. This proposed AD would require upgrading software. This proposed AD results fromreports ofanomalies with TeAS 

### units during aflight test over ahigh density airport. The TeAS units dropped several reduced surveillance aircraft tracks because ofinterference limiting. We areproposing this AD to prevent TeAS units from dropping tracks, which could compromise separation ofairtraffic and lead to subsequent mid-air collisions. DATES: We must receive comments 011 

### this proposed AD by 

### [TNSERT DATE 45 DAYS AFTER DATE OF PUBLICATION INTHE FEDERAL REGISTER]. ADDRESSES: You may send conUllents by any ofthe following methods:

• Federal eRulemaking Portal: Go tohttp://w\'vw.regulations.gov. Follow the instructions forsubmitting comments.

• Fax: 202-493-2251.

• Mail: U.S. Department ofTransportation, Docket Operations, M-30, West Building Ground Floor, Room WI2-140, 1200New Jersey Avenue SE., Washington, 0 20590. 

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DEPARTMENT OFTRANSPORTATION Federal Aviation Administration 14CFH. Part 39 [Docket No. FAA-2010-++++j Directorate Identifier 2010-NM-147-ADI RIN 2120-AA64 Airworthiness Directives; Various Transpart Category and Small Airplanes Equipped with Aviation Communication & Surveillance Systems (ACSS) Traffic Alert and Collision Avoidance System (TeAS) Units Installed on but not limited to Various Transport and General Aviation Airplanes AGENCY: Federal AViation Administration (FAA), DOT. ACTION: 

### NOlice of proposed rulemaking (NPRM). SUMMARY: We propose to adopt anew airworthiness directive (AD) for various aircraft equipped with certain ACSS TeAS units. This proposed AD would require upgrading software. This proposed AD results from reports of dropped tracks of ACSS TeAS units. We are proposing this AD to prevent TeAS units from dropping tracb, which could compromise separation of air traffic and lead to subsequent mid-air collisions. 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 ofthe following methods:

• Federal cRulcmaking Portal: Go to hnp://www.regulations.\2ov. Follow the instructions for submitting comments .
• Fax: 202-493-2251.

FAAForm 1360-14.1 (6-89) Of"fICl.G,LFILE COpy(4910-13-P] DE1'ARTMENT OF TRANSPORT AnON Federal Aviation Administration 14eFR 

### Part 39 [Docket No. FAA-2010·++++; Directorate Identifier 2010-NM-147-AD] RlN 2120-AA64 

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ACTION: Notice ofproposed rulernaking (NPRl\1). AGENCY: Federal Aviation Administration (FAA), DOT. (ACSS) Traffic Alert and Collision Avoidance System (TeAS) Units

SUMMARY: We propose to adopt anew ainvonhiness directive (AD) for various aircraft equipped with certain ACSS 

### TeAS units. This proposed AD would require Ainvorthiness Directives; Various Aviation Communication & Surveillance Systems

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## 1,;:? DATES: We must receive comments on this proposed AD by [INSERT DATE 45 

# I,.rt1tf.:) 0 [) DAYS AFTER DATE OF PUBLICAT10N IN THE FEDERAL REGISTER]. 

# ~'f ADDRESSES: You may scnd comments by any ofthe following methods: ;_\~~~

• Fedcral cRulemaking Portal: Go 10http://wv.'W.reeuJations.gov. Follow Lhe '-:-:':!!l.L instructions for submitting comments_

• Fax: 202-493-2251. 

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• Mail: U.S. Department of Transportation, Docket Operations, M-30, We$t Building Ground Floor, Room WI2-140 ..1200 New Jersey Avenue SE., Washington, DC 20590.