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KTA 970/KMH 980 Pilot's Guide
SL B
In sensitivity level B, TCAS I performs surveillance and tracking
functions and provides traffic advisories. The conditions for sensitiv-
ity level B are based on own aircraft in-flight and:
(1) If radio altitude source is installed and own aircraft altitude is
above 2,000 feet AGL (radio altitude).
(2) If radio altitude source is NOT installed and own aircraft has
Landing Gear Retracted.
(3) If the aircraft has a fixed landing gear and no radio altimeter is
installed.
Sensitivity
Level
SL A
The following conditions cause TCAS I to generate a TA in sensitivi-
ty level A:
• TCAS I calculates that if current closing rate is maintained, sepa-
ration of less than 600 feet in altitude between own and Intruder
will occur in 20 seconds.
• Separation between own and Intruder is less than 600 feet in alti-
tude and less than 0.20 nautical mile range.
• NAR (Non-Altitude Reporting) Intruder is within 15 seconds or
0.20 nautical mile range.
SL B
The following conditions cause TCAS I to generate a TA in sensitivi-
ty level B:
• TCAS I calculates that if current closing rate is maintained, separa-
tion of less than 800 feet in altitude between own and Intruder will
occur in 30 seconds.
• Separation between own and Intruder is less than 800 feet in alti-
tude and less than 0.55 nautical miles in range.
• NAR (Non-Altitude Reporting) Intruder is within 20 seconds or
0.55 nautical mile range.
Standby
or Fail
• TAs are not generated.
Mode
Table 2: Typical Traffic Advisory Conditions for Sensitivity Levels
Rev 2
Table 1: TCAS I Sensitivity Levels
CONDITIONS FOR TRAFFIC ADVISORIES (TAs)
TCAS I Theory of Operation and Symbology
7
006-18273-0000
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