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Thread: TCAS - Absolute Altitude
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Old 9th September 2015 | 14:49
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fellman
 
Joined: Oct 2007
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From: UK
See FAA Advisory Circular 20-151a, "Airworthiness Approval of TCAS II, Versions 7.0 & 7.1 and Associated Mode S Transponders"


https://www.google.co.uk/#safe=activ...rcular+20-151a


2-7. Pilot Control. A pilot control for the TCAS equipment shall be provided...
c. The following optional controls may be provided:...
(4) Selection of actual flight level (FL) or relative altitude of traffic.
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