14 CFR 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 of proposed rulemak.ing (NPRM).

SUMlVlARY: We propose to adopt a new airworthiness directive (AD) for various

airc-raft equipped with certain ACSS TeAS units. This proposed AD would require

upgrading software. This proposed AD results from reports of anomalies with TeAS

units during a flight test over a high density airport. The TeAS units dropped several

reduced surveillance aircraft tracks because of interference limiting. We are proposing

this AD to prevent TeAS units from dropping tracks, which could compromise

separation of air traffic 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 IN THE FEDERAL REGISTER].

ADDRESSES: You may send conUllents by any of the following methods:

• Federal eRulemaking Portal: Go to http://w\'vw.regulations.gov. Follow the

instructions for submitting comments.

• Fax: 202-493-2251.

• Mail: U.S. Department of Transportation, Docket Operations, M-30, West

Building Ground Floor, Room WI2-140, 1200 New Jersey Avenue SE., Washington, 0

20590.

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14910-13-P}

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFH. 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 a new 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

DA YS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].

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

• Federal cRulcmaking Portal: Go to hnp://www.regulations.\2ov. Follow the

instructions for submitting comments .

• Fax: 202-493-2251.

FAA Form 1360-14.1 (6-89) Of"fICl.G,L FILE 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 of proposed rulernaking (NPRl\1).

AGENCY: Federal Aviation Administration (FAA), DOT.

(ACSS) Traffic Alert and Collision Avoidance System (TeAS) Units

SUMMARY: We propose to adopt a new 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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upgrading software. This proposed AD results from reports of dropped tracks of ACS .

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TCAS units. We are proposing this AD to prevent TeAS units from dropping tracks, l~0 ~e,IG

which could compromise sep:ation of air traffic and lead to subsequent mid-air ~~_LECi: ~\0

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collisions. ~ (~y ><- r~/:>, j 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 of the following methods: ;_\~~~

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

instructions for submitting comments_

• Fax: 202-493-2251. .,

• 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.