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3.1.2.11.3  The US National Standard for the Mode S Beacon System, FAA Order 6365.1A, paragraph 6.3 requires – When the interrogator transmitter is not transmitting an interrogation, its output does not exceed .5 dBm effective radiated power at any frequency.  This requirement exceeds the ICAO SARPs frequency of interest 960 to 1215 MHz. 
Chapter 4  Airborne Collision Avoidance System 
4.1  US documentation contains the following definition for TA: Information given to the pilot pertaining to the position of another aircraft in the immediate vicinity. The information contains no suggested maneuver. The ICAO SARPs considers this a potential threat.  The TAs are issued to show all nearby traffic.  TCAS does not determine by a test or analysis that some of these aircraft may be a potential threat. Information given to the pilot pertaining to the position of another aircraft in the immediate vicinity.  The information contains no suggested maneuver. 
4.2.3.3  The TSO.C118 (RTCA DO.197) implements this requirement. However, requirement of limiting Mode S power to the level of Mode A/C (paragraph 4.2.3.4) is not implemented. 
4.3.1.1.1  Specifies a nominal cycle of 1 second 
4.3.2.1.2  The US specifies a false track probability of less than 1.2% for Mode A/C and less than 0.1% for Mode S. 

4.3.2.2.2 4.3.2.2.2.2 4.3.2.2.2.2.2 4.3.2.2.2.2.3  TCAS II Version 6.04A Enhanced Interference Limiting Algorithms won’t comply with these sections of the standards and recommended practices (SARPs). See remark below. 
4.3.5.1  TCAS II Version 6.04A Enhanced won’t comply because it has a 3.second coordination delay. See remark below. 
4.3.5.3  TCAS II Version 6.04A Enhanced does not comply since the section implies a requirement for reversals in some instances in encounters between two TCAS II.equipped aircraft. See remark below. 
4.3.5.4  TCAS II Version 6.04A Enhanced does not comply since the section explicitly requires reversal of coordinated resolution advisories (RAs) under some circumstances. See remark below. 
4.3.5.5  TCAS II Version 6.04A Enhanced does not comply since it contains a dormancy requirement, does not have 5.second targets, and only has surveillance of : 3,000 feet in altitude. See remark below. 
4.3.8.4.2.2.1 4.3.8.4.2.2.1.1  TCAS II Version 6.04A Enhanced has different RA Report formats in DF=20, 21 replies. See remark below. 
4.3.8.4.2.2.1.3  TCAS II Version 6.04A Enhanced has different RA Report formats in DF=20, 21 replies. See remark below. US documentation contains an additional requirement After an RA has been terminated: by TCAS, it is still required to be reported by the Mode S transponder for 18±1 seconds. 
4.3.8.4.2.2.1.4 4.3.8.4.2.2.1.5 4.3.8.4.2.2.1.6 4.3.8.4.2.2.16.1 4.3.8.4.2.2.1.6.2 4.3.8.4.2.2.1.6.3  TCAS II Version 6.04A Enhanced has different RA Report formats in DF=20, 21 replies. See remark below. 
4.3.8.4.2.2.2 4.3.8.4.2.2.3  TCAS Version 6.04 Enhanced has different Data Link Capability format in DF=20, 21 replies. See remark below. 
4.3.8.4.2.3.2.3  TCAS Version 6.04 Enhanced has different Data Link Capability format in DF=20, 21 replies. See remark below. The US uses ”don’t descend” vs. ”do not pass below” and ”Don’t climb” vs. ”do not pass above” 
4.3.8.4.2.3.2.5  Limited to TCAS with horizontal on.board resolution equipment 
4.3.8.4.2.3.2.7  Limited to TCAS with horizontal on.board resolution equipment 
4.3.8.4.2.3.4 4.3.8.4.2.3.4.1 4.3.8.4.2.3.4.2 4.3.8.4.2.3.4.3 4.3.8.4.2.3.4.4  TCAS II Version 6.04A Enhanced RA does not meet the Broadcast format specified in these sections. See remark below. 
4.3.8.4.2.3.4.5  TCAS II Version 6.04A Enhanced RA does not meet the Broadcast format specified in these sections. See remark below. The US specifies a different bit coding scheme.  The US has implemented the AID code. The bit pattern documented in the RTCA document is in the bit order as received from the control head. The Annex 10 SARPs show the bit order of the RF transmission. 
4.3.8.4.2.3.4.6  TCAS II Version 6.04A Enhanced RA does not meet the Broadcast format specified in these sections. See remark below. 
4.3.8.4.2.4.2.1 4.3.8.4.2.4.2.3 4.3.8.4.2.4.2.4  TCAS II Version 6.04A Enhanced has a different Coordination Reply format in DF=16 replies. See remark below. 

Remark  The U.S. does not require TCAS II Version 7 (ACAS II) equipage in its National Airspace System. 
4.3.9.3.1  The US specifies 10 ft or less. 
ACAS  The US uses the term Traffic Alert and Collision Avoidance System (TCAS).  The difference of terminology does not impact interoperability of the systems. 
　
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